A Simulation Method of Echo Signal Used in CW Radar
A technology of echo signal and simulation method, applied in radio wave measurement systems, instruments, etc., can solve the problems of signal leakage, no method that can simulate the dynamic leakage of continuous wave radar, etc.
Active Publication Date: 2016-08-24
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology
[0003] Many advantages of continuous wave radar are brought about by continuous transmission and reception, but this also leads to a major disadvantage of continuous wave radar: signal leakage
[0007] According to the existing public data query, there is currently no method that can simulate the dynamic leakage of continuous wave radar
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[0061] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
[0062] Such as figure 1 As shown, the method of the present invention is used to numerically simulate the echo signal for continuous wave radar, and the specific implementation process is as follows:
[0063] (1) Initialize the system parameters, the system parameters include radar system parameters and the crystal oscillator parameters of the radar frequency synthesizer, wherein the radar system parameters include radar antenna center coordinates (x, y, z), ground target coordinates , radar antenna beam width φ, radar motion direction vector The velocity v of the radar relative to the target, the wavelength λ of the radar emission signal, and the power P of the radar emission signal t , radar antenna pattern G(β), radar antenna central axis vector Backscatter coefficient σ per unit area 0 , radar isolation degree D, the power spectrum P (...
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The invention relates to an echo signal simulation method used for a continuous wave radar. According to relative position and distance of the radar and a target, and a radar motion speed, the method calculates a doppler frequency and an echo time delay of transmission signals of the radar and then according to a radar equation and a radar system parameter, echo useful signals received by a radar antenna are obtained; then, according to a static phase noise spectrum of output signals of a radar crystal oscillator, and a mechanical response of the crystal oscillator on a carrier, a dynamic phase noise spectrum of the output signals of the crystal oscillator is calculated, and according to an isolation value of the system, a dynamic power spectrum of leakage signals is obtained and converted into time domain data of radar leakage dynamic signals; and at last, the echo useful signals are added with the leakage dynamic signals so that radar echo signals which include the dynamic leakage signals are obtained. The method is capable of simulating continuous wave radar echo signals which are approximate to a real environment and the method can be used for testing a DC offset circuit of a continuous wave radar and is applicable to a test system of a flight landing radar.
Description
technical field [0001] The invention relates to the field of continuous wave radar signal processing, in particular to an echo signal simulation method for continuous wave radar, which is suitable for the verification of the continuous wave radar's DC cancellation capability. Background technique [0002] Continuous wave radar is a radar that obtains target information by emitting continuous waves. According to the different transmission signals, it can be divided into single frequency or multi-frequency, or frequency modulation continuous wave radar, which is mainly used in the occasion of distance measurement and speed measurement. Because it emits continuous waves, the peak power is low, and it has good performance in electronic countermeasures and low probability of interception; in addition, its speed measurement does not have speed ambiguity, and there is no distance blind zone in ranging, while other radars must have this advantage. It's quite complicated. Moreover,...
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IPC IPC(8): G01S7/40
CPCG01S7/4052G01S7/4056
Inventor 孙嘉谭小敏党红杏王科张爱军牛文博刘瑞冬
Owner XIAN INSTITUE OF SPACE RADIO TECH