Pseudo-code shift multiplicative-based distance-Doppler two-dimensional matched filtering method

Abstract

The invention discloses a pseudo code shift multiplicative-based distance-Doppler two-dimensional matched filtering method, which utilizes the shift multiplicative property of a pseudo code to performphase-coherent accumulation on weak target echoes to obtain a distance-speed two-dimensional resolution capability. Compared with an existing matched filtering method, the method has the advantages that the problems of pulse pressure gain loss and distance sidelobe deterioration caused by Doppler sensitivity of pseudo code phase modulation continuous waveforms are completely solved, and the method can be suitable for strong clutter and multi-target environments and is high in engineering practicability.

Description

technical field [0001] The invention belongs to the technical field of shooting range measurement radar and low-altitude target surveillance radar, and specifically relates to a range-Doppler two-dimensional matched filter method based on pseudo-code shift multiplication of pseudo-code phase-modulated continuous wave radar, which can detect weak The target echoes are coherently accumulated to obtain the distance-velocity two-dimensional resolution capability. Background technique [0002] Due to the advantages of low interception, strong anti-jamming ability, no close-range blind zone, strong short-range small target detection ability and high two-dimensional distance-velocity resolution ability, the pseudo-code phase-modulated continuous wave radar is widely used in the fields of shooting range measurement and low-altitude target monitoring. There are certain applications. [0003] Typically, range-dimensional matched filtering is implemented by correlating the echo signal...

AI Technical Summary

Problems solved by technology

However, the PN-coded phase-modulated CW waveform is Doppler-sensitive. When using the correlation matching algorithm, the target Doppler will cause a loss of pulse pressure gain and deteriorate the range sidelobe

[0004] Aiming at the Doppler sensitivity problem of the pseudo-code phase-modulated continuous wave waveform, the industry usually adopts the following two types of Doppler tolerance extension methods: the first type of method is based on Doppler compensation, and the one with high engineering application value is Harbin Industrial Co., Ltd. The "Signal Processing Method Based on Doppler Filter Bank and Doppler Motion Compensation" proposed by the university has the advantages of high compensation accuracy and strong environmental adaptability, but it has not completely eliminated the pseudo-code phase-modulated continuous wave theoretically. Detrimental Effects of Waveform Doppler Sensitivity

The second type of method is based on the shift multiplication of pseudocode (some people also call it shift additivity), and its algorithm performance is related to the specific technical approach; according to the existing technical approach, the environmental adaptation of the second type of method The performance is not as good as the first type of method, such as "processing method based on zero-IF echo signal IQ delay cross multiplication and difference", in the multi-target scene there will be cross-terms, and cross-terms will produce false targets and deteriorate the main peak. Flap ratio

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