30results about How to "Avoid emulation" patented technology

The invention discloses a performance analysis method of a UAV relay system based on spatial modulation. Aiming at the UAV relay system based on spatial modulation, a system is established in which the system experiences the Rice channel under the condition of no direct link. model; according to the definition of the joint bound, the system bit error rate is divided into three different error cases, and according to the probability density function and cumulative distribution function of the channel information, the calculation method of the system bit error rate joint bound is given, and further The calculation method of the approximate bit error rate joint bound of the system under high signal-to-noise ratio is given; the diversity degree of the system is given according to the approximate bit error rate joint bound of the system under high signal-to-noise ratio; The proposed performance analysis method can effectively evaluate the bit error rate performance of the system.

The invention provides a vehicle-mounted bus simulation model self-generating method and system. According to the vehicle-mounted bus simulation model self-generating method and system, a full-simulation or semi-physical simulation model is generated based on vehicle data information; and CANoe software-based simulation model or test model automatic generation is realized through steps such as electronic control module attribute definition, bus behavior logic strategy database entry and bus database file loading, and therefore, bus behavior full-simulation and bus semi-physical test environment construction can be realized. The system has the advantages of simple and convenient operation, fast script generation, stable performance, excellent operation, high extensibility and high flexibility. The system is provided with a comprehensive and extensible logical database and is suitable for all kinds of model detection of passenger vehicles; and the system is provided with an expert experience library, so that performance evaluation can be completed through direct or indirect information read service relationships.

The invention relates to a frequency comprehensive device behavior level modeling method considering noise source affect, belonging to the technical field of wireless transmission communication. In order to improve the traditional behavior level modeling method carried out for a sigma-delta fraction N frequency comprehensive device in the prior art, the method provided by the invention comprises the steps of: modeling a phaselocked loop system of the sigma-delta fraction N frequency comprehensive device with jitter noise; and modeling a sigma-delta demodulator. The technical scheme of the invention greatly helps a designer design a circuit, and is convenient for early estimating the influence of the phase noise of the frequency comprehensive device to the whole wireless communication system. The invention can ensure that a circuit designer carries out the rapid simulation to obtain system performances, especially noise performance, thereby avoiding using simulators of SPICE, SpectraRFand the like with very low speed for simulation. The invention can be used for accelerating the design process of the sigma-delta fraction N frequency comprehensive device from top to bottom so as toensure that the designer accurately predicts the system performances as early as possible, especially indexes of the phase noise and the like.

The invention provides a method for optimizing an additional magnetic field pattern of a plasma vortex driving device. According to the method, an analytical functional relationship between specific additional magnetic field distribution and heat dissipation distribution is established, the influence of the distribution characteristics of the additional magnetic field on the heat dissipation distribution can be rapidly and accurately analyzed, a large number of repeated experiments or numerical simulation is avoided, and a large number of time and material resources are saved. According to theoptimized additional magnetic field type obtained through the optimization method, joule heat dissipation on the surface of the cathode of the vortex driving device can be reduced by 19%, and viscousheat dissipation can be reduced by 68%.

The invention discloses a method for designing a DCMFK (Debiased Converted Measurement Kalman filter) based on an FPGA (Field Programmable Gate Array). Firstly, a system of the DCMFK based on the FPGA is designed. A gain matrix module comprises an average real covariance submodule and a gain matrix submodule; a state update module comprises a coordinate transformation submodule, an average real deviation submodule, an innovation submodule and a state update submodule; a trigonometric function module, a one-step prediction module, a prediction error covariance module, a filter error covariance module, the average real covariance submodule, the gain matrix submodule, the coordinate transformation submodule, the average real deviation submodule, the innovation submodule and the state update submodule respectively invoke floating adding, subtracting, multiplying and dividing operation modules. A hierarchical design is adopted in the method, modules at the bottom layer realize input by utilizing a VHDL (Very High Speed Integrated Circuit Hardware Description Language), and a schematic diagram input manner is adopted by the modules on the top layer; therefore, the method can improve the readability of codes, is easy to divide modules, and is convenient to simulate during designing.

The invention discloses a unit quick selection method of an opportunity array antenna and solves the problem that existing opportunity array antenna units are difficult to be selected quickly. The unit quick selection method includes: setting parameters; determining beam width: determining half-power beam width through unit simulation; randomly selecting an antenna unit, and setting an initial value; performing outside-unit normal vector solving to serve as an antenna radiation direction; calculating an included angle between the maximum radiation direction and a beam pointing direction, wherein the included angle is taken as a selection basis; judging whether to select for comparison or not, and calculating the included angle within a range being half of the half-power beam width to meetrequirements of the selection antenna unit; judging whether search is completed or not: detecting whether all antenna units are already searched or not; completing antenna unit selection to quickly acquire a proper antenna unit. A radiation unit is accurately and quickly selected under a given scanning angle by combining with an antenna unit radiation direction diagram, efficient and effective unit selection is realized, and the unit quick selection method is used for the field of radar and detection by utilizing antennas.

The invention relates to the technical field of three-pin automatic impedance matching, in particular to a fast three-pin automatic impedance matching system. The fast three-pin automatic impedance matching system includes the following steps: 1) establishing a three-pin waveguide equivalent circuit; 2) establishing a circuit parameter relationship; 3) designing a matching algorithm. The invention directly establishes the mathematical relationship among the reflection coefficient, load impedance, pin depth and S parameter of the three-pin waveguide, and can quickly calculate the scattering parameter and load impedance according to the reflection coefficient and the pin depth, thereby realizing fast impedance matching calculation. Based on the equivalent circuit method and numerical calculation, the invention can greatly reduce the amount of computation, simplify the design process of automatic impedance matching, does not require a database, and can be widely used in pin waveguides of different sizes.

The invention discloses a simulation system applicable to an IC equipment workpiece positioning motion stage and a modeling method. The method comprises steps as follows: obtaining component models of base components of the motion stage, classifying the component models according to subject fields, and establishing a component-level multi-field model base; selecting component models from the component-level multi-field model base to establish a function-module-level model base; selecting models in the function-module-level model base to establish a system-level model; inspecting the system-level model, and if no error exists, setting model parameters to finish modeling of the motion stage simulation system. The system comprises the component-level multi-field model base, the function-module-level model base, the system-level model, a model compiling and simulating module and an output module. The component-level multi-field model base, the function-module-level model base and the system-level model are established in a unified MWorks modeling environment on the basis of Modelica modeling language. The modeling method is high in applicability, high in modeling efficiency and capable of effectively solving the problem of multi-field coupling.

The invention discloses a method for correcting an error of a polarization detection device. The polarization detection device comprises a phase retarder, an analyzer and a photoelectric detector which are sequentially arranged along an optical axis of the device system, wherein the output of the photoelectric detector is connected with a signal processing system; and the linearly polarized light with the Stokes parameter of (1, 1, 0, 0) enters the polarization detection device. The method comprises the following steps of: setting the angle of a transparent shaft of the analyzer to be 0 and performing measurement for the first time to obtain a first measurement error of the normalized Stokes parameter; setting the angle of the transparent shaft of the analyzer to be 45 degrees and performing measurement for the second time to obtain a second measurement error of the normalized Stokes parameter; and solving the phase retardation error of the phase retarder, the fast axis angle error and the transparent shaft angle error of the analyzer in the polarization detection device so as to realize error correction. According to the method, the device error in the polarization detection device can be measured under the condition that the polarization detection device does not need to be detached, so that the device error is corrected.

The invention discloses a double-step Monte Carlo simulation method applied to radioactive ray dose computation. The double-step Monte Carlo simulation method comprises the following steps: step 1, performing Monte Carlo simulation, thereby acquiring valid seed numerical array; step 2, after acquiring the valid seed numerical array in the step 1, by utilizing valid seed numerical values, performing secondary Monte Carlo simulation and computing radioactive ray dose distribution inside the human body at a high speed. The invention provides a double-step Monte Carlo simulation algorithm; simulation of photons acted on a tumor region according to the valid seed numerical values can be performed, and simulation of photons without passing through the tumor region is avoided, so that computational efficiency is improved.

The present invention belongs to the automation test field, relates to the automation test technology aiming at aircraft airborne embedded software, and relates to a construction method of a script-based embedded software simulation and test integrated platform. Implementation of the construction method is based on configuration of a real-time processor and a main control computer. In the main control computer, test cases and simulation models are described by using test scripts, anomaly detection is also carried out, and the scripts which are tested to be correct are sent down to the real-time processor. In the real-time processor, simulation of external crosslinking devices and a test device of a to-be-tested device is implemented on basis of the scripts. The external crosslinking devices are simulated by the simulation model scripts, and the test device is simulated by the test case scripts. The simulation model scripts and the test case scripts are parsed by a real-time script interpreter, all simulation and test tasks are added to a task register and scheduling module, and finally interaction with the to-be-tested device is implemented through a bus driving module.