201results about How to "Improve engineering practicability" patented technology

The invention discloses a method for modeling and error compensation of temperature drift of a fiber optic gyroscope, which comprises the following steps of: obtaining a learning sample and denoising the learning sample; establishing a fiber optic gyroscope temperature drift error compensation model based on temperature gradient; establishing a parameter formula based on a temperature change rate so as to determine the relations between the temperature change rate and various parameters of the fiber optic gyroscope temperature drift error compensation model; and subtracting a temperature drift compensation value, obtained by the fiber optic gyroscope temperature drift error compensation model, from the real-time output data of the fiber optic gyroscope to realize temperature compensation to the fiber optic gyroscope. The invention not only realizes modeling for the temperature drift of the fiber optic gyroscope in mechanism, but also simultaneously and greatly improves the convenience and accuracy of modeling, and has important significance to performance research and improvement of the fiber optic gyroscope in constantly variable temperature environments.

The invention relates to a self-learning mechanism-base fast matching fuzzy reasoning method. The method includes the following steps that: a Gaussian membership degree function method is adopted to construct parameter fuzzification information; a fuzzy rule base is established; external parameters are fuzzificated, so that a fact item can be obtained; the fact item is matched with rules in the fuzzy rule base by adopting a rete algorithm, so that a fuzzy reasoning result can be obtained; the fuzzy reasoning result is subjected to defuzzification, so that a final reasoning result can be obtained; and a sample set is constructed according to the final reasoning result and an actual feedback result, and rule strength self-learning correction is carried out based on the sample set. According to the self-learning mechanism-base fast matching fuzzy reasoning method of the invention, the rete algorithm is adopted, so that the efficiency of fuzzy reasoning can be improved, and the fuzzy reasoning method can be applied to the engineering field with high real-time requirements.

The invention provides a full-duplex active phased array antenna radio frequency link system and a method for determining transmit-receive isolation. An emission phased array system radio frequency link is composed of an emission antenna array plane, a resistance receiving filter, a power amplifier, a phase shifter, a one-to-M power divider, a driving power amplifier and a one-to-N power divider. A receiving phased array system radio frequency link is composed of a receiving antenna array plane, a resistance sending filter, a lower-noise amplifier, a phase shifter, a P-to-one synthesizer, a driving low-noise amplifier and a Q-to-one synthesizer. The method comprises the steps of: firstly extracting voltage scattering vectors, then calculating the power coupled to the receiving phased array system radio frequency link, and determining the isolation of the resistance sending filter; in addition, calculating total heat noises coupled from the emission phased array system radio frequency link to the receiving antenna array plane, and determining the isolation of the resistance receiving filter. The full-duplex active phased array antenna radio frequency link system and the method for determining the transmit-receive isolation solve the problems in the prior art that the isolation is designed according to design experience, the design balance is large, and the design difficulties of the resistance receiving filter and the resistance sending filter are increased.

The invention discloses a plate structure impact monitoring method based on the fractal theory, and belongs to the technical field of impact monitoring of structure health monitoring. The method comprises steps as follows: step one, distribution of distributed fiber bragg grating sensors; step two, computation of box-counting fractal dimensions of the fiber bragg grating sensor impact response signals; step three, collection of the fiber bragg grating sensor impact response signals corresponding to sample impact points and box-counting fractal dimension computation; step four, collection of the fiber bragg grating sensor impact response signals corresponding to to-be-detected impact points and box-counting fractal dimension computation; step five, computation of x-axis coordinates of the to-be-detected impact points; step six, computation of y-axis coordinates of the to-be-detected impact points. According to a positioning algorithm, the positions of the impact points are judged through computation of the box-counting fractal dimensions of fiber bragg grating sensor impact response signal frequency spectrums, and the method has the characteristics of no need of a large number of prior knowledge, simplicity, rapidness, convenience, high practicability and the like.

The invention belongs to a nondestructive detection technology and relates to an industrial scale ultrasonic automatic scanning and imaging detection device used for large-scale structures made of composite materials and metal materials in the fields of aviation, aerospace, electronics, weapons, ships, metallurgy, iron and steel, transportation, construction and the like. The detection device comprises an ultrasonic automatic scanning system, an ultrasonic automatic scanning control and imaging system and a multi-channel ultrasonic system. The design according to the invention adopts a multi-axis parallel numeric control upward floating type super-static steady scanning mechanism and an ultrasonic flexible self-adaptive tracking array acoustic scanning technology, thereby greatly improving the ultrasonic automatic scanning and imaging detection efficiency and the imaging quality of the large-scale structures, realizing the industrial scale high-efficient ultrasonic automatic scanning and imaging detection of the large-scale structures made of the composite materials and the like in different specifications and enabling the detection resolution and a surface blind zone to achieve 0.13mm; and when 20 channels are detected, the efficiency is improved by at least 50 times compared with the manual scanning detection efficiency, and is improved by 20 times compared with the traditional single-channel ultrasonic automatic scanning detection.

A co-vibrating type vortex-induced vibration power generation device based on multiple vibrators comprises vibrators, supporting rods, connecting rods, linear guide rails, linear springs, a transmission rod and a linear power generator; the supporting rods are fixed at the bottom of a water flow; the linear guide rails are arranged in the middles of the supporting rods, and perform linear movement in the vertical direction; the connecting rods are used for connecting all vibrators to be a whole vibrator group; the front ends and the rear ends of the connecting rods are fixed to the linear guide rails; a linear spring for enabling the vibrators and the connecting rods to perform linear movement back and forth in whole is arranged at each of the upper end and the lower end of each linear guide rail; the middle parts of the connecting rods are fixedly connected with the transmission rods to enable the transmission rods to move along the connecting rods together; the top of the transmission rod is connected with the linear power generator. The co-vibrating type vortex-induced vibration power generation device has the advantages that a wake flow galloping effect is utilized, the generating efficiency of the vibrator group is improved, and a large number of small-capacity power generators are replaced with a small number of high-capacity power generators, so that the cost is reduced; the device has a simple structure, is easy to implement, and can be widely used in the vortex-induced vibration power generation engineering using ocean currents and tail water of a hydroelectric station.

The invention relates to a backtracking type self-aligning method of a single-axial rotation strapdown inertial navigation system. According to the method, an initial curing coarse alignment method is adopted to process sampled data of a gyroscope and an accelerometer in real time, the gesture matrix of initial time is calculated, during the process, key data is synchronously compressed and stored for each second; after coarse alignment, the stored data is used to carry out backtrack Kalman filtering fine alignment, positive calculation is performed till the end, and in a Kalman filtering device, the installation rod arm is set in an error state to carry out online estimation. The provided method can guarantee the alignment precision and alignment time, at the same time, avoids the tedious reverse navigation calculation, reduces the memory space and calculation amount, and improves the engineering practicality.

The invention discloses a data traffic radio channel distribution method and a system thereof. The method comprises the following steps of: acquiring (temporary block flow) TBF statistical data of a cell; determining the data traffic bandwidth demand of the cell according to the acquired TBF statistical data; acquiring the statistical data on the proportion of each encoding mode used by a data packet transmitted by the cell and the statistical data of a data retransmission rate; determining the single time slot bandwidth of the cell according to the acquired statistical data on the proportionof each encoding mode and the retransmission rate; and distributing packet data channels (PDCHs) for the cell according to the quantity of the data packet channels (PDCHs) determined according to thedata traffic bandwidth demand and the single time slot bandwidth. By adopting the method, the data traffic bandwidth demand on a cell level can be predicted accurately according to the TBF statistical data, so as to accurately predict the quantity of the wireless channels required by the data traffic of the cell and improve the utilization ratio of radio resources.

The invention discloses a low-profile two-dimensional wide-angle scanning circular polarization phased-array antenna, and aims to provide an antenna structure which is easy to integrate and has good wide-angle scanning gain characteristics and circular polarization characteristics. According to the technical scheme, each 3D structure antenna unit forms an array unit of the two-dimensional wide-angle scanning circular polarization phased-array antenna through metal columns which are arranged between an annular radiator and a circular polarization patch slotting radiator in a circumferential circular array mode; each 3D structure antenna unit is fixed on the two-dimensional layer surface of the upper dielectric plate through a feed column fixedly connected to the lower surface of the circularly polarized slotted patch radiator; the feed column penetrates through the lower dielectric plate, the four 3D structure antenna units are connected with the annular radiator upwards and are connected with the feed base disc downwards, the four adjacent 3D structure antenna units form a 2*2 rectangular arrangement subarray in a touch type feed and 90-degree sequential rotation arrangement mode,and the four feed base discs are delayed by 90 degrees clockwise in sequence for feeding, so that the optimal right-handed circular polarization performance is obtained.

The invention discloses a distribution network fault recovery method based on an A* algorithm and a fireworks algorithm. The method comprises the steps of (1) reading original data of a distribution network and simplifying the distribution network, (2) converting a contact switch into a virtual distribution power generation device DG and classifying the DG, (3) carrying out first stage algorithm,defining an initial node and a solution node, and using the A* algorithm to carry out power supply recovery on an important load, (4) carrying out second stage algorithm, reading distribution networkdata after first stage optimization, and using the fireworks algorithm to carry out power supply recovery on a rest load, and (5) integrating the optimal programs of the two stages, and determining afinal fault recovery program. According to the method, a staged method is adopted, a globally optimal solution is ensured, and the computing speed is fast.

A multi-vibrator based mutual vibration type vortex-induced vibration generation device which comprises vibrators, support rods, connecting rods, bearings, torsion springs, linear guide rails, lower transmission rods, an upper transmission rod and a linear generator is disclosed. Each support rod is fixed at the bottom of water flow; the middle part of each connecting rod is hinged to the top of each support rod through each bearing; the middle part of each connecting rod where each torsion spring is arranged is fixed at the outside of each bearing; the two ends of each connecting rod are connected to each linear guide rail respectively; the outer ends of the linear guide rails are connected to the vibrators respectively; the bottom of each lower transmission rod is fixedly connected to the middle part of each connecting rod, and each linear guide rail is arranged on the top of each lower transmission rod; the upper transmission rod is connected to each lower transmission rod through each bearing to constitute an integral vibration system; the upper transmission rod is connected to the linear generator. The advantages of the multi-vibrator based mutual vibration type vortex-induced vibration generation device are that the device realizes uniform energy collection of the multiple vibrators, improves generation efficiency of vibrator group, reduces manufacturing and installation cost and improves engineering practicability as a large number of low-capacity generators are replaced by a small number of high-capacity generators, and is simple in structure as well as easy to implement.

The invention discloses a building energy-saving glass. The building energy-saving glass comprises two glass sheets and a seal spacer positioned between the two glass sheets, a closed cavity is formed among the seal spacer and the glass sheets, transparent heat insulation SiO2 aerogel plates are filled in the closed cavity, a transparent SiO2 aerogel aqueous rubber is used to seal the transparent heat insulation SiO2 aerogel plates, and a butyl rubber is used to seal the seal spacer and the glass sheets. Convection heat loss and condensation phenomena caused by air transmission are greatly reduced, so compared with a hollow glass and a low-irradiation hollow glass in the prior art, the energy saving glass filled with the transparent heat insulation SiO2 aerogel plates has a high heat insulation performance and simultaneously has a high light transmission rate; and the energy saving glass has a heat insulation performance near to that of a vacuum glass, and has a substantially higher service life than the vacuum glass.

The invention discloses a breakdown diagnosis method for semiconductor devices. The method includes the following steps: firstly establishing an expert system which includes a fuzzy rule database and an inference engine; further, conducting fuzzy processing on a semiconductor device real-time monitoring parameter to generate a fuzzy fact; the inference engine, on the basis of the fuzzy fact, performing fuzzy processing by interacting with the fuzzy rule database to generate a breakdown diagnosis result; and on the basis of actual application conditions of the breakdown diagnosis result, carrying out rule intensity self-learning correction targeted at the fuzzy rule database. According to the invention, the method performs fuzzy inference and further obtains the breakdown diagnosis result based on the rete algorithm, and carries out rule intensity self-learning correction on the fuzzy rule database in combination with the actual application of the breakdown diagnosis result, so that the method increases the precision and automation of the breakdown diagnosis for semiconductor devices and ensures efficient and stable operation of the semiconductor technology.

The invention discloses a power system security and stability adaptive emergency control system and a method in order to solve the technical problem in existing adaptive emergency control that an emergency control online strategy aiming at the running state before the fault time is adopted, the running time corresponding to the strategy is always earlier than the fault time, and the practicability of the strategy can hardly meet the engineering requirements. According to the adaptive emergency control method of the invention, emergency control optimization decision calculation is carried out for the future running state, so that there are emergency control optimization strategies corresponding to a period before and a period after the fault time respectively. When the 'mode word' used to search an offline strategy at the fault time is the same with the 'mode words' of the emergency control optimization strategies at two time moments before and after the fault time respectively and close to the fault time, the union set of the emergency control optimization strategies at the two time moments is used as an adaptive emergency control strategy at the fault time. Organic unity between control precision and reliability is realized, and the engineering practicability is improved.

The invention discloses a low speed impact position identification method based on approximate entropy calculation and belongs to the impact monitoring technology field of structure health monitoring. The method comprises the following steps of step1, carrying out distributed optical fiber bragg grating sensor layout; step2, adopting a calculating method of optical fiber bragg grating sensor impulse response signal approximate entropy; step3, collecting an optical fiber bragg grating sensor response signal corresponding to an impulse point to be measured and carrying out approximate entropy calculation; step4, determining an area where the point to be measured is located and calculating an approximation entropy of a sample impulse point response signal in the area; step5, constructing a relation model of a distance of the impulse point to a sensor and a corresponding approximation entropy difference value; and step6, based on a three-line crossing method, determining a position of the impulse point to be measured. A positioning algorithm in the invention possesses characteristics that a lot of prior knowledge is not needed; and practicality is high and so on.

Belonging to the technical field of impact monitoring of structural health monitoring, the invention discloses a low velocity impact location identification method based on correlation dimension calculation and three-circle intersection principle. The method includes the steps of: 1. sensor layout; 2. correlation dimension calculation of impact response signal time sequence; 3. processing of sensor response signal corresponding to a to-be-measured impact point and correlation dimension calculation of its time sequence; 4. determination of the area where the to-be-measured point is located, and calculation of the correlation dimension of sensor response signal time sequences corresponding to different sample impact points in the area; 5. building of a relational model between the length from a sample impact point to a sensor and the correlation dimension of sensor response signal time sequence in the area where the sample point is located; and 6. calculation of the specific coordinate location of a to-be-measured impact point based on three-circle intersection. The method provided by the invention has the characteristics of no need for a lot of prior knowledge and good transplantability, etc.

The invention relates to an absolute navigation filtering method capable of estimating drifting of an accelerometer. A GPS (Global position system) receiver is adopted to output position information, the PI type filtering technology is adopted to estimate the position error, the speed error and the acceleration error, Kalman filtering calculation is omitted, the satellite calculation amount is greatly simplified and the acceleration error is estimated, and therefore, the absolute navigation filtering method has the beneficial effects that the inertial navigation recurrence precision can be improved, the autonomous navigation precision is remarkably improved, the engineering practicability is improved, the new thought for autonomous navigation is acquired, the application to deep space exploration soft landing can be expanded and the like.

The invention belongs to the field of radar signal processing, and in particular relates to a sparse hole diameter ISAR imaging method based on SBL-ADMM. The method comprises the following steps of S1, sparse hole diameter radar echo modelling; S2, target HRRP and ISAR image statistical modelling; and S3, sparse hole diameter ISAR image reconstruction based on SBL-ADMM. The method provided by the invention has the beneficial effects that the target sparse prior information can be fully used, the high-resolution target ISAR image can be reconstructed from the sparse hole diameter radar echoes; and aiming at the problem that solving of the posterior probability during an ISAR imaging process involves matrix inversion and is high in computation complexity, ADMM is combined with the SBL theoretical framework, the computation efficiency of the sparse hole diameter ISAR imaging method is significantly improved, and the engineering practicability of the method is greatly enhanced.

The invention discloses a device and a method for hydraulic structure deformation distribution type optical fiber monitoring. The device comprises a through-bottom vertical shaft, wherein a displacement platform is arranged in the through-bottom vertical shaft, drill bit driving devices are arranged at the two sides of the displacement platform, are connected with conical drill bits, and are respectively connected with lifting ropes, the lifting ropes are wound around coiling discs, the middle part of the displacement platform is connected with one end of each of a pair of springs, the other end of each of the pair of springs is hinged to a vertical measuring ruler, the vertical measuring ruler penetrates through a scale platform, an optical fiber hanging bucket is arranged between the two springs, a wavy loop optical fiber is arranged in the optical fiber hanging bucket, an optical fiber buckle is arranged on the wavy loop optical fiber, an optical wave transmitter is arranged at the input end of the wavy loop optical fiber, and an optical wave collector is arranged at the output end of the wavy loop optical fiber. The device has the advantages and characteristics that the repeated use is realized, the installation is very convenient, the real-time detection and maintenance are realized, the distributed type structure is realized, the micro and macro effect and real-time effect are realized, the suitability to complex environment is high, and the like.

The invention discloses a device and a method for monitoring the vertical deformation of a hydraulic construction. The device comprises a bottom-through shaft and an inner carrying tube positioned inside the bottom-through shaft, wherein a displacement station is arranged in the inner carrying tube; drive motors are symmetrically arranged on two sides of the displacement station, and are connected with a conical drill by virtue of a five-stage piston; piston shells on two sides are respectively connected with lifting devices which are used for promoting motion of the piston shells; correcting devices which are used for correcting level of the displacement station are symmetrically arranged at two ends of the displacement station; the middle part of the displacement station is connected with one end of a group of symmetrically arranged springs, and the other end of each spring is hinged with a vertical measuring tape; an optical fiber hanging drum is arranged between two springs, and is filled with a corrugated loop optical fiber; and an optical fiber buckle is arranged on the corrugated loop optical fiber. The device has the advantages of use repeatability, convenience in assembly, real-time detection and maintenance and the like, and has the characteristics of distribution type, micro-macro structure, real-time performance, high adaptability to complex environment and the like.

The invention discloses a fatigue crack propagation monitoring method for a single-sided notched aluminum alloy test piece based on a FBG sensor. The method adopts a distributed fiber Bragg grating sensor network to sense fatigue crack propagation in the structure, extracts a central wavelength offset of the FBG sensor as a characteristic parameter, establishes a fatigue crack length prediction relationship model by using the variation of the central wavelength offset of the FBG sensor with different positions as the crack propagation, and realizes the fatigue crack propagation length prediction. The fatigue crack propagation monitoring method in the invention realizes the prediction of the crack propagation position by calculating the central wavelength offset of the FBG sensor, and has the characteristics such as fast speed, perceptual intuition and no need for a large amount of prior knowledge.

The invention discloses a device and a method for monitoring differential settlement in portfolio for a soil-stone combined region with a hydraulic structure. The device comprises a bottom-through shaft and an inner carrying tube positioned inside the bottom-through shaft, wherein a displacement station is arranged in the inner carrying tube; drill driving devices are symmetrically arranged on two sides of the displacement station, and are connected with conical drills; the drill driving devices on two sides are respectively connected with lifting devices which are used for promoting motion of the drill driving devices; correcting devices which are used for correcting level of the displacement station are symmetrically arranged at two ends of the displacement station; the middle part of the displacement station is connected with one end of a group of symmetrically arranged springs, and the other end of each spring is hinged with a vertical measuring tape; an optical fiber hanging drum is arranged between two springs, and is filled with a corrugated loop optical fiber; and an optical fiber buckle is arranged on the corrugated loop optical fiber. The device has the advantages of use repeatability, convenience in assembly, real-time detection and maintenance and the like, and has the characteristics of distribution type, micro-macro structure, real-time performance, high adaptability to complex environment and the like.

The invention discloses a calculation method of a static voltage stability critical point of a power system, which solves the problem that the power flow at the static voltage stability critical pointis unsolvable due to the singularity of a Jacobian matrix. The main steps include: calculating the basic power flow, increasing the node load until the classical Nulla method does not converge, usingthe AQ node method to calculate the critical point of the static voltage stability of the system and so on. By introducing a new node type-AQ node into static voltage stability analysis, this methodimproves the traditional continuous power flow analysis method which needs to be corrected repeatedly to obtain the critical point of static voltage stability, This method can cause 'deflection' of matrix singular points at the critical point of static voltage stability, eliminate the singularity of Jacobian matrix completely and obtain the critical point of static voltage stability quickly and accurately, because it takes a long time and may not converge in the correction process and calculation processes are complex.

The invention relates to a multi-unmanned aerial vehicle cooperative wide-area moving target searching method based on a hybrid mechanism, and belongs to the field of unmanned aerial vehicle cooperative target searching. The invention provides the multi-unmanned aerial vehicle cooperative wide-area moving target searching method based on the hybrid mechanism to solve the problems that an existing multi-unmanned-aerial-vehicle cooperative wide-area moving target searching method is wide in task area range, low in searching efficiency, too long in task searching time, direct in course angle discretization and the like. The multi-unmanned aerial vehicle cooperative wide-area moving target searching method integrates the advantages of coverage search and an information graph-based search mode, divides a task area into a key area and a general area according to the target existence probability, preferentially covers and searches the key area by using a scanning line, and searches the general area by using a pheromone-based mechanism. On the basis, the track of each unmanned aerial vehicle is optimized in an online rolling manner by adopting a rolling time domain optimization method. According to the method, the moving target in the task area can be quickly searched, the flight paths of a plurality of unmanned aerial vehicles can be generated online, and the task searching time is effectively shortened.

The invention belongs to the technical field of power system power distribution network planning and operation, and particularly relates to a reconstruction method for a power distribution network with a distributed power supply after serious fault. The method for reconstructing the power distribution network with the distributed power supply after serious fault is suitable for rapid reconstruction of the power distribution network with the distributed power supply after the serious fault, and is convenient to model, high in simulation precision, high in calculation efficiency and strong in expansibility. The method comprises the following steps: 1, establishing an objective function and constraint condition model of a reconstruction problem after the power distribution network has the fault; 2, performing modeling analysis on the distributed power supply when power distribution network fault occurs; 3, adopting a spanning tree model based on the graph theory to solve an optimal methodof island division; 4, completing the weight dynamic division of a multi-objective function through a membership function, and normalizing a power distribution network reconstruction multi-objectiveoptimization problem into a single-objective optimization problem; and 5, solving the reconstruction optimization problem based on an empire competition algorithm to obtain an optimal reconstruction strategy after the serious fault of the power distribution network.

The invention provides a detection method for an initial position of a rotor in a static state of a PMSM. A voltage vector is injected along the direction of a random phase of stator, and proper voltage pulse injection time is determined; a pair of basic space voltage vectors in positive and negative directions is injected to the PMSM in the static state along the direction of each of three phasesof stators, and a three-phase current value of the PMSM is detected and recorded the moment that a pulse effect of each basic space voltage vector ends; and current values, obtained by sampling, of each phase are accumulated algebraically, and an angle of the initial position of the rotor of the PMSM is calculated according to a formula. The method does not needs a lot of data operation, a realization algorithm is simple, steps are simple, realization is easy, and the engineering practicality is higher; the method is not limited by the saliency of the rotor, and can be widely applied to surface-mounted and embedded PMSMs.

The invention relates to a magnetometer calibration method based on particle swarm optimization of a double-objective function, which belongs to the field of sensor calibration. The method comprises the following steps: analyzing all kinds of errors of a magnetometer and establishing an error model of the magnetometer; establishing a double-objective function in a particle swarm optimization algorithm; and calculating the error parameters of the magnetometer according to a particle swarm optimization algorithm based on the Von Neumann topology. The problem of low accuracy caused by the lack ofrestriction on the three-axis magnetic field component during magnetometer correction by the traditional particle swarm optimization algorithm is solved. By adopting the Von Neumann topology, the situation in which particles can easily fall into local optimum and the parameters cannot be estimated is improved, and the global search ability of the algorithm is enhanced. The method of the inventiondoes not need a large amount of data or good initial value condition and noise distribution, and is easy to operate. The simulation experiments show that the accuracy of parameter calibration can reach more than 95%. It is ensured that the algorithm is simple under large error of a gyroscope. The method has high engineering practicability and a broad application prospect.

The invention provides a risk assessment method for city waterlogging taking water level jacking influence of tidal rivers. The method comprises following steps: determining probabilities of simultaneous distribution between rainstorms-tidal river water levels, determining a hydraulic computation grid of a hydrology-drainage system for analyses of city waterlogging risks, creating a coupling model of a hydrology-drainage system to calculate a waterlogging parameter h in the grid, creating a waterlogging risk analyzing map taking water level jacking influence of tidal rivers, covering probability density of simultaneous distribution to a hydraulic grid of the hydrology-drainage system, connecting same waterlogging parmaters h to the isoline Lh; and calculating different occurrence probabilities of h0 to obtain city waterlogging parameter values in different recurrence intervals. The risk assessment method for city waterlogging taking water level jacking influence of tidal rivers has following beneficial effects: rainstorms and high water levels of tidal rivers can be imitated within the extreme value range so that low dependence is on hydrologic hydraulic historical data, thereby enhancing engineering practicability; and only by calculating the combined scene between a specific hydrology-drainage system and the hydraulic grid, coupling events of rainfall and tidal river water levels are not needed to be imitated so that assessment efficiency is greatly increased.

The invention belongs to the technical field of radar imaging and discloses a related motion error compensation method based on BiSAR echoing, a system and application. Through BiSAR signal modeling and wave number vector decomposition, image spectrum analytical expression under polar coordinates is obtained, and a correlation between a phase error caused by a motion error and non-systematic distance unit migration is found; and a phase error is roughly estimated by methods of combined estimation and compensation. FFBP imaging treatment is conducted on an echoing signal, so that an SAR image under the polar coordinates before error compensation is obtained; the image is converted to a distance compression-orientation frequency domain, and rough estimation of a phase error thereof is conducted, so that the rough phase error is obtained; and NsRCM is compensated with the phase error obtained by rough estimation, and then phase error fine estimation and fine compensation are carried out,so that image focusing quality is finally improved. The method, system and application disclosed by the invention greatly reduce dependence on a high-precision inertial navigation measurement system and have high processing efficiency and engineering practicability.

The invention provides an ultra wide band bridge based on a thick film manufacturing technology. The ultra wide band bridge comprises a thick film circuit substrate, a coaxial cable, a magnetic core and a capacitor. The ultra wide band bridge is externally provided with three mutually connected ports P1, P2 and P3, wherein the port P1 and the port P3 are two radio frequency ports connected to a resistor power distribution circuit and the port P2 is connected to the unbalanced end of a Balun. When signals are transmitted in a non-inverting mode, the port P1 serves as an input port, and after resistor power distribution, partial power is coupled to the port P3 to be output and partial power is directly output through the port P2. When the signals are transmitted in an inverting mode, the port P2 serves as the input port, the signals are converted by the Balun from being unbalanced to being balanced, two routes of signals which are equal in amplitude and opposite in phase are obtained at the balanced end, the two routes of signals are offset at the port P3 through power distribution circuits respectively, signal isolation is achieved for the port P3, and partial power is directly output through the port P1. By the adoption of the ultra wide band bridge based on the thick film manufacturing technology, the applicable frequency of the directional bridge based on the Balun and the resistor power distribution circuit can be improved to be in a millimeter wave band, a larger working bandwidth can be realized, and the ultra wide band bridge is simple in structure and convenient to integrate.