57results about How to "Fast capture" patented technology

The invention discloses a high-sensitivity satellite navigation signal capturing method and a system. The system comprises a digital down-conversion module, an average sampling and block accumulation module, an FFT (fast Fourier transform) module, a circumference shifting module, a local PRN (pseudo random noise) code FFT conjugate memory, a complex multiplier module, an IFFT (inverse fast Fourier transform) module, a differential coherence integration module, a peak detection module and a sequential control module. The digital down-conversion module realizes digital down-conversion operation for satellite digital intermediate frequency signals; the average sampling and block accumulation module averagely samples satellite data and completes a block accumulation function; the FFT module searches code phase frequency domains; the circumference shifting module utilizes Doppler circumference shifting search to replace frequency compensation; the local PRN code FFT conjugate memory stores a local PRN code FFT conjugate result; the complex multiplier module realizes signal de-spreading; the IFFT module calculates different code phase coherence results; the differential coherence integration module accumulates differential coherence energy of de-spread satellite signals; the peak detection module realizes signal capturing output; and the sequential control module controls timing sequence of the various modules of the system. Weak signal capturing speed and sensitivity of a satellite navigation receiver are improved, and parameters can be configured flexibly.

The invention discloses a GPS signal large-scale parallel quick capturing method, which comprises the following steps: configuring a large-scale parallel quick capturing module firmware comprising submodules of multiplier, data block cache, parallel part correlative processing, frequency domain transformation, postprocessing and digital controlled oscillator, code generator and the like in a system CPU; through the calling computation, converting low-medium frequency digital signals into baseband signals in a processing procedure to combine a data block; performing zeroing extension of the length and the data block on each equational data section in the data block; then based on FFT transformation computation, performing parallel part correlative PPC processing on each extended data section and local spreading codes, and performing FFT transformation on each line of a formed PPC matrix to obtain a result matrix; and performing coherent or incoherent integration on a plurality of result matrixes formed by processing a plurality of data blocks to increase the processing gain, improve the capturing sensitivity, roughly determine the code phase and the Doppler frequency of GPS signals, and achieve two-dimensional parallel quick capturing of the GPS signals. The method has high processing efficiency and high capturing speed, and can be applied to various GPS positioning navigation aids.

The invention relates to a universal pseudocode synchronization system of comprehensive satellite baseband equipment, and the system comprises six parts, i.e. a digital lower variable frequency module (10), a tracking related module (20), a capture pre-processing module (30), a capture related module (40), a capture management module (50) and a tracking control module (60), and completes the pseudocode capture, carrier tracking, pseudocode tracking and bit synchronization functions of remote control or range finding data in a test to a satellite according to a preset process; and the six parts are realized in a field-programmable gate array (FPGA). According to the universal pseudocode synchronization system of the comprehensive satellite baseband equipment, the parameters of the capture module are configured flexibly according to the test needs of the actual satellite, so that the quick capture and tracking of various remote control signal or range finding signal pseudocodes are realized, and the system has better practical value and wide application prospect in the technical field of comprehensive satellite baseband testing.

The invention provides a device for processing the frequency domain of a GNSS reflected signal and method thereof. The device comprises a receiving antenna, a radio frequency module, a signal processing module and an application processing module. The information of the direct projection signal and each multidiameter component such as code time lag and carrier frequency, phase are evaluated by cumulating the signal containing the reflected signal and spectral mapping and frequency domain analysis. The evaluated component of the multidiameter component can be used for use of the reflected signal, such as measuring the height using reflected signal, measuring the sea breeze. In view of tracking the direct projection signal from the receiver, the multidiameter component can be differentiated and eliminated, therefore the receiver can ease the influence of the multidiameter on code and carrier wave at the condition of the closed close range multidiameter. When the system changes, the structure of the signal processing module is constant and the parameter is adjusted to track and process the signal and the effective solution plan is provided to use and eliminate the multidiameter.

The invention discloses a control method of a monitoring ball machine. The method comprises the following steps of (1) vertically and horizontally dividing a to-be-monitored space into a plurality of small partitions, and setting a shooting focal distance for each small partition; (2) setting corresponding preset positions for a central point position and an edge point position of each small partition, and storing horizontal position information, vertical position information and shooting focal distance information of the ball machine; (3) reading a video frame, and performing target detection on the video frame; (4) according to direction information of a detected target in a monitoring scene, mapping the target to the corresponding preset position; (5) calling the preset position by the ball machine to acquire a monitored image. The defects that the automation degree of control is not high, the real-time property and the flexibility are not enough, and human manual interference is required in a ball machine of the traditional video monitoring system are overcome; the control method is convenient in operation, high in automation degree of control and good in instantaneity, and is particularly good in capture effect on the monitored image of a quickly moving target.

The invention discloses an adaptive under-actuated non-cooperative target capturing mechanism. An existing capturing mechanism is poor in adaptation of the size and shape of a target. A nut driving plate and a stretching platform form a helical pair with a first thread and a second thread of a variable pitch screw respectively; the nut driving plate is provided with an armature, and the stretchingplatform is provided with an armature and a travel switch; a mechanical arm driving plate is connected with the nut driving plate through a flexible connecting part; three five-rod type mechanical arm bodies are uniformly distributed in the circumferential direction and connected to the mechanical arm driving plate; a third connecting rod in each five-rod type mechanical arm body can cooperate with a torsional spring to be converted to be an under-actuated mechanism; mechanical arm tail end execution mechanisms are connected to the three five-rod type type mechanical arm bodies; a buffer guide mechanism is located in the center of the circumference where the three five-rod type type mechanical arm bodies are uniformly distributed. Accordingly, a single power source is adopted for achieving unfolding of three mechanical arms, the mechanism has the multi-degree of freedom and can flexibly adapt to target satellite spray pipes with different sizes and shapes.

The invention discloses a fast acquisition system and a fast acquisition method suitable for multipath random access signals. An intermediate frequency signal received by a message communication receiver is input to a digital down conversion module after AD sampling for digital down conversion to obtain a zero intermediate frequency signal, the zero intermediate frequency signal is sent to a low-pass filter, and the data processed by low-pass filtering through the low-pass filter is sent to a capture module for capture operation. Aiming at the characteristics of multipath random access signals, the capture module uses a mode of ping-pong RAM buffer to extract, store and calculate the data, which realizes continuous search of inbound signals. The fast acquisition system and fast acquisitionmethod suitable for multipath random access signals solve the problem of fast capture of the multipath random access signals. In the case of limited on-board resources, the multipath random access signals can be quickly captured according to different satellite PRN number configurations and different pseudo-code initial phases. At any time, the capture probability of the inbound signals is greater than 99%, and the capture time is shorter.

The invention discloses application of amino acid as a hydrate accelerant and application of amino acid as the hydrate accelerant in capturing and sealing of carbon dioxide. The application of amino acid as the hydrate accelerant is particularly application of amino acid as a CO2 hydrate accelerant. The application of amino acid as the hydrate accelerant in the capturing and the sealing of carbon dioxide comprises the following steps: (1) uniformly mixing 100 parts by weight of water and 0.01-3 parts by weight of amino acid, so as to obtain an amino acid water solution; (2) injecting the amino acid water solution into a high-pressure reaction kettle; (3) introducing high-pressure CO2 gas into the high-pressure reaction kettle to react, so as to obtain solid CO2 hydrate with high air storage density, thereby realizing the efficient capturing and sealing of carbon dioxide. By utilizing amino acid as the CO2 hydrate accelerant, the application meets the scientific concept of ''environmental friendliness'' and economic and efficient, the hydration induction time can be greatly shortened, and the gas capturing capacity can be increased.

The invention discloses a method for capturing cells by the aid of magnetic nano-particles. The method includes that the magnetic nano-particles and samples with the circulating tumor cells (CTC) are blended with one another, the circulating tumor cells CTC and the magnetic nano-particles are combined with one another to obtain circulating tumor cells CTC with magnetic nano-particle markers, the samples with the circulating tumor cells CTC with the magnetic nano-particle markers flow through capillary tubes with the sectional inner diameters of 1 mm at the flow rate of 2-10 ml per hour, magnetic fields are applied to the peripheries of the capillary tubes when the samples flow through the capillary tubes, the circulating tumor cells CTC with the magnetic nano-particle markers can be deflected under the effects of the magnetic fields to be attracted by the magnetic fields, but normal cells which are not marked by the magnetic nano-particles in the samples can continue flowing through magnetic field zones to be collected by sample collecting pools; the magnetic fields on the peripheries of the capillary tubes are removed, the circulating tumor cells CTC, which are adsorbed on the walls of the capillary tubes, with the magnetic nano-particle markers are washed down by solution and are collected to obtain the tumor cells. The method has the advantages that the circulating tumor cells can be quickly captured by the aid of the method, and the method is easy and convenient to implement, easy to operate and high in universality.

The invention is applicable to the technical field of weightlessness physiological effect protection, and provides an outer space somatosensory recognition motion analysis system and a motion analysismethod. A sensor is used for obtaining bone data of an exerciser on a running platform in a marker-less optical action capture mode; the bone data and a pre-built three-dimensional coordinate systemare used for determining a three-dimensional coordinate of the human body joint point of the exerciser; a human body action data analysis module is used for generating lower limb motion parameters ofthe exerciser according to the change of the three-dimensional coordinate of the human body joint point of the exerciser; and an analysis result display module is used for displaying the lower limb motion parameters of the exerciser and visually displaying the motion postures and states of the exerciser. When the exerciser runs, the calculated and analyzed motion result is synchronously displayedin front of the exerciser, and can be used for helping the exerciser visually master the self motion postures and states.

The invention discloses a trans-track inter-satellite antenna based on switching and a capturing and tracking method of the trans-track inter-satellite antenna based on switching. The trans-track inter-satellite antenna based on switching comprises a microwave switching assembly and an antenna array, wherein the antenna array is composed of N narrow beam antenna array elements, the microwave switching assembly is provided with an equipment coupling port P1, an equipment coupling port P2 and N antenna coupling ports, the equipment coupling port P1 is connected with a satellite-borne transmitter and a satellite-borne receiver through duplexers, the equipment coupling port P2 is connected with a signal detector, each narrow beam antenna array element is connected with the corresponding antenna coupling port, radio frequency channels can be formed between each equipment coupling port and all the antenna coupling ports respectively, the electric axes of all the narrow beam antenna array elements point to different directions, so that a radial pattern is formed in the space, and the wave beam coverage areas of every two adjacent narrow beam antenna array elements overlap, so that the whole antenna array meets the requirement for the wave beam coverage area when the positions of satellites on tracks change relatively.

A capture pad structure includes a lower dielectric layer, a capture pad embedded within the lower dielectric layer, the capture pad comprising a plurality of linear segments. To form the capture pad, a focused laser beam is moved linearly to form linear channels in the dielectric layer. These channels are filled with an electrically conductive material to form the capture pad.

The invention discloses a general binary phase shift keying (BPSK) signal rapid acquisition module which includes a preprocessing unit, a parallel correlation unit and an FFT and determination unit. The preprocessing unit preprocesses the baseband digital signal adc sampled and input by an analog-to-digital converter (ADC), and provides digital signals data_i and data_q close to zero frequency for the parallel correlation unit. The parallel correlation unit performs cyclic storage of the digital signals data_i and data_q and local pseudo code generation and storage, and also performs parallel correlation operation on the pseudo code and data_i and data_q. The FFT and determination unit performs detection and determination of signals in a frequency domain. The inventive general BPSK signal rapid acquisition module can compatibly acquire various signal system GNSS (global navigation satellite system) signals (such as GPS C / A code, BD C code, and GLONASS C code), and adopts a dual-port RAM (random access memory) for matched filtering, so as to effectively save FPGA (field programmable gate array) resources, achieve faster acquisition speed and realize interference detection function.

The invention relates to the technical field of high-order APSK carrier synchronization, in particular to a phase tracking method of a low-earth-orbit satellite MAPSK communication system. Two phase discriminators are adopted, a loop filter with variable parameters is introduced, and the carrier recovery process is divided into coarse synchronization and fine synchronization; firstly, amplitude judgment is carried out on an MAPSK modulated signal, coarse synchronization is carried out on four constellation points with high signal-to-noise ratio on an excircle by using a polarity judgment algorithm of a simplified constellation, and at the moment, the bandwidth of a loop filter is relatively large, so that large frequency offset can be quickly captured; if the state controller finds that the loop filter is in a locked state by detecting the loop phase error, the loop filter is unlocked, it shows that the coarse synchronization is finished, the carrier recovery circuit is switched to thefine synchronization, phase discrimination is carried out on all constellation points by using a decision guide algorithm, and the loop filtering achieves the purpose of stable tracking through a small-bandwidth mode, thereby effectively improving the performance of the low-orbit satellite high-order APSK communication system.

A dry material is synthesized by alkali metal (Li, Na and K) promoted calcium aluminate carbonates to obtain a CO2 sorbent used at a temperature higher than 600 Celsius degrees (° C.). The key composition of the sorbents is 52˜69% of CaO, which is beneficial to capture CO2 at 400˜800° C. A breakthrough result is achieved by using this sintering-resistant sorbent, which includes the features of 50% initial carbonation capacity and 20 folds CO2 capturing performance maintained after 40˜60 hours. Besides, alkali bearing material provides good velocity in CO2 capturing / releasing cycles; for example, by using Li and K series sorbents, 40 hours is required for 40 cycles only.

The invention provides a drone catching mechanism and device for artificial insemination and belongs to the technical field of beekeeping. The drone catching mechanism comprises a bee collecting box,bee discharge bases and a bee discharge body and is characterized in that the bee collecting box is mounted on the bee discharge bases, the bee discharge body is mounted on the front portions of the bee discharge bases, and the bee discharge bases are communicated with the bee discharge body; a top cover is arranged at the top of the bee collecting box and provided with worker bee escaping outletsand a drone outlet; the bee discharge bases are provided with first worker bee inlets / outlets, and a plurality of second grilles are mounted at the first worker bee inlets / outlets and used for stopping drones and allowing worker bees to pass; the bee collecting box is provided with first drone one-way inlets used for allowing the drones to freely pass; the bee discharge body is provided with a one-way outlet used for allowing the drones and the worker bees to freely pass and leave the device. The drone catching mechanism and device is simple in structure and high in drone catching efficiency.

The invention provides alkaline powder for treating leaked hydrogen sulfide poisonous gas and a production method thereof. A neutralization capturing agent, a desiccant and an additive are prepared into the alkaline powder according to a certain ratio by a specific method. The production method adopts the easily available raw materials and has simple processes and low energy consumption. The alkaline powder has particles of 60 to 160 meshes, and has a specific surface greater than 32m<2> / g, bulk density greater than 0.85g / cm<3>. After sprinkling, the alkaline powder has good settlement performances and has a settlement recovery rate greater than or equal to 95% in 2min. The alkaline powder can effectively treat hydrogen sulfide gas, has a fast treatment rate, produces dry and fluffy residues after treatment, can be cleaned easily, and has a wide application range and small damage on the environment.

The invention discloses a method for purifying antibodies using high-density peridium magnetic beads of protein A. The method comprises the steps as follows: adding magnetic beads and expression products containing antibodies into a reacting container, applying magnetic fields outside or inside the reacting container and then taking supernatants out; adding washing buffers and removing the magnetic fields; rewashing the magnetic beads for two to four times; then adding washing buffers, removing the magnetic fields and hatching for 5 to 15 min at the room temperature; applying magnetic fields to making the magnetic beads stuck on walls and removing magnetic fields; and adjusting the pH value of solvents to be neutral so as to prepare the purified antibodies. The method provided by the invention adopts a magnetic bead affinity separation technology to purify the antibodies, and compared with the traditional antibody affinity chromatography technology, the method provided by the invention has a high antibody capturing speed; additionally, purifying operation does not need a complex chromatography system, samples do not need to be clarified, and samples with large viscosity can be purified directly; and specific protein A peridium magnetic beads are used, so that the combining efficiency of the antibodies is greatly improved, and the expulsion rate of protein A ligands reaches a very low level.

The invention belongs to the technical field of a power distribution network of an electric power system, and specifically relates to a multi-dimensional nine-area optimal control strategy analysis method based on a power distribution network system. The multi-dimensional nine-area optimal control strategy analysis method based on a power distribution network system applies a reactive compensationcontrol device of the power distribution network system to reactive regulation of the power distribution network system, and fully considers the practical load operation curve peak and valley maximums, wherein time division and the like of each load section changes due to seasonal, holiday and working day differences and other factors, so that setting of the time is synchronized with the change of each load segment. In the multi-dimensional nine-area optimal control strategy analysis method based on the power distribution network system, the power distribution network system includes a controller, control switches and capacitors, wherein one end of the each control switch is connected to the corresponding capacitor, and the other end of the control switch is connected to a power supply and is provided with an electric quantity acquisition device; and the electric quantity acquisition device is connected to the controller, and then a control port of the controller is connected to a switching port of the each control switch. The multi-dimensional nine-area optimal control strategy analysis method based the power distribution network system can realize comprehensive analysis and regulation of the power distribution network, can improve the stability of the system and the power supply quality of power consumers, and also can improve the grid voltage quality, reduce the network loss and reduce the labor intensity of dispatchers.

Based on position of preset information, the invention determines original positions of de-mapped channel symbol, decoded channel TPC, decoded channel RS or decoded channel NR. Based on the said original positions, the system realizes synchronization of de-mapped symbol, decoded channel TPC, decoded channel RS and decoded channel NR so as to complete de-mapped symbol, decoded channel TPC, decoded channel RS or decoded channel NR. Since spread spectrum protection is carried out for preset information, entire synchronization process can still be accomplished under condition in larger interference and before equilibrium.

The invention provides a method for capturing a multi-user burst spread spectrum signal of an asynchronous communication system, and aims to reduce the overhead brought by capturing a synchronous head, and capture needs to be completed as short as possible at the beginning of a burst signal. Therefore, the system adopts a carrier-code full parallel correlation method to capture, and adopts a method of combining multi-bit coherent accumulation with multiple non-coherent accumulation to divide a carrier Doppler interval into a plurality of different subcarrier intervals in order to improve the accumulated signal-to-noise ratio, and parallel capture is carried out in each subcarrier interval, and a plurality of users with different code phases can be identified through duplicate removal.

The invention discloses an ultra-wideband hopping spread signal rapid capturing method, which can solve the problems of low capturing precision and long capturing time. The invention relates to an ultra-wideband hopping spread signal rapid capturing method, which comprises the following steps of: 1, completing frequency hopping carrier stripping of an input sampling signal through double-path down-conversion alternate de-hopping; 2, completing code stripping through chip sliding correlation operation; and 3, performing coherent accumulation on correlation results in each frequency hopping time period, and then completing multiple times of incoherent accumulation; and comparing the obtained final accumulated peak value with a preset capture judgment threshold value to judge whether capture succeeds. Through the method, the problems in the prior art can be well solved.

The invention discloses a universal navigation signal capturing and processing method, and relates to a rapid and efficient signal capturing method for traditional and modern frequency point signals of an existing mainstream navigation system, including GPS L1CA / L5 / L1C, BDSB1I / B2I / B3I / B1C / B2a / B2b / S2C, Galileo E1 / E5a / E5b, GLONASS L1f / L2f and other civil signals. According to the invention, a corresponding local code is generated according to the configuration of software, adaptive sampling is carried out on the local code and signal data, and capture processing is carried out based on a PMF-FFT algorithm. The segment length and the segment number in PMF-FFT algorithm parameters have flexible configuration, and the effects of flexibly configuring various PMF-FFT algorithm parameters and flexibly designing the time-frequency unit search processing parallelism are achieved by designing the effective combination of two FFT length conversion functions. The method has a flexible switching function of various capture speeds, capture sensitivity and Doppler coverage, and has the characteristics of a strong signal compatibility, a fast capture speed and high capture sensitivity.

The invention discloses an online automatic deviation rectification cutting system based on an optical flow camera and PID control. According to the cutting system, online automatic deviation rectification can be performed on non-transparent cutting materials. The problem that the cutting materials deviate and consequentially, the cutting quality declines is solved. The cutting system mainly comprises an optical imaging module, a control module and an execution module. According to the online automatic deviation rectification cutting system, the real-time pixel offset is obtained through the optical imaging module and sent to the control module, a calibration principle and a PID control principle are applied to the pixel offset through the control module, the real-time control amount is calculated and then input into a driver so as to drive a motor to drive a tool blade to perform position compensating, and accordingly, the purpose of online automatic deviation rectification is achieved. By means of the online automatic deviation rectification cutting system, the problems that an existing online automatic deviation rectification cutting system is complex in structure in practical deviation rectification application, the requirement for imaging quality is high, and the calculation amount is large are solved, the system is applicable to high-speed cutting environments, and the deviation rectification precision is improved on the basis that the cost and the calculation amount reduction are taken into consideration.

The invention discloses an insect catching method for efficiently and accurately investigating field thrip population density. The insect catching method comprises the following steps: randomly selecting 5 investigating points in a field region and selecting 3 to 5 types of thrip host plants from each investigating point; spraying a thrip anaesthesia drug on 20 to 30 plants of each type of the thrip host plants, wherein the spraying time is 11:00 to 13:00 of sunny days; 0.5h to 1.5h after spraying the drug, catching insects; counting the sum of the quantity of thrips on each type of plants in the field region and taking the sum as the thrip population density in the field region. The method disclosed by the invention can be used for accurately investigating a real condition of the field thrips and has the advantage of simplicity in operation.

The invention discloses an intelligent visual capturing and pressure maintaining device for deep sea benthos sampling, which comprises a sampling capturing mechanism, a pressure maintaining mechanism, a 360-degree deep water panoramic camera for monitoring deep sea benthos and a cable for transmitting electric power, and is characterized in that the sampling capturing mechanism comprises a capturing unit and a storage unit; a water pump paddle used for providing reverse siphon force for the interior of the capturing cylinder when the capturing cylinder extends out is arranged at the connecting port of the pressure-resistant cylinder, and a pressure maintaining driving device used for opening the sealing cover when the collecting port is opened and closing the sealing cover when the collecting port is closed is arranged in the box body; the automatic control mechanism is used for controlling the in-situ pressure in the pressure maintaining cavity in the rising process after capturing is completed. The benthic organism capturing device is simple in structure, benthic organisms can be actively, flexibly and efficiently captured, the organisms are prevented from escaping, and the survival rate of the organisms is increased.