High-resolution radar target echo signal generating method

Abstract

The invention discloses a high-resolution radar target echo signal generating method. According to the high-resolution radar target echo signal generating method, the characteristic that subtle features of radio-frequency signals can be reserved completely through a DRMF technology is utilized, and a radar transmitting signal sampling sequence is obtained through down-conversion and A / D sampling; a target feature response model is obtained through experiments or an electromagnetic field numerical computing method; convolution is carried out on the radar transmitting signal sampling sequence and the target feature response model, a data sequence after the convolution is reverted to the radio-frequency signals through D / A and up-conversion, and the radio-frequency signals serve as high-resolution radar simulation target echo signals and are output. The simulation target echo signals generated by adopting the technology reserve phase information of transmitting signals and also contain feature information of a target to be detected, and the high-resolution radar target echo signal generating method can be used for high-resolution radar tests. The high-resolution radar target echo signal generating method is already applied in certain equipment developed by the institute, and the effectiveness and the correctness of the method are verified.

Description

technical field [0001] The invention relates to a method for generating a high-resolution radar target echo signal. The target echo signal generated by the method not only retains the phase information of the radar transmission signal, but also carries the characteristic information of the detected target, and can be used for high-resolution radar testing. It belongs to equipment Test technology field. Background technique [0002] Early radars mostly used a non-coherent point frequency working system, using a common microwave signal source that was synchronized with the radar transmitter and worked at the same frequency to generate a simulated target echo signal that met the test requirements. In the later period, non-coherent frequency-agile radar appeared, using instantaneous frequency measurement and frequency guidance technology to meet the requirements of radar pulse-to-pulse frequency agility. Its working principle is to quickly measure the operating frequency of the...

AI Technical Summary

Problems solved by technology

Its working principle is to convert the radar transmission signal into a surface acoustic wave or light wave through a transducer, and then delay it by a surface acoustic wave delay line or an optical fiber delay line, and then convert the delayed sound wave or light wave into a radio wave by the transducer , using the propagation of sound waves in the acoustic wave delay line or the propagation of light waves in the fiber optic delay line to equivalent the propagation of electromagnetic waves in space, because the delay line can retain the phase information of the original radar transmission signal, it can be used for coherent and quasi-coherent radar feedback Wave signal simulation, but the disadvantage is that once the delay line is completed, the delay time is fixed, and the continuous change of the target distance cannot be simulated, so the distance tracking performance of the radar cannot be measured, and the delay line is used to directly monitor the radar transmission signal. Time delay, unable to superimpose target characteristic information in the simulated echo signal

The numerical control delay line technology can realize the step-by-step change of the simulated echo delay, but it cannot add target characteristic information to the simulated target echo signal, and cannot meet the requirements of modern high-resolution radar testing for the simulated target echo signal

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