Pulsed Doppler radar ambiguity-resolving ranging method based on jitter repetitive frequency

Abstract

The invention discloses a pulsed Doppler radar ambiguity-resolving ranging method based on jitter repetitive frequency. The implementation steps of the pulsed Doppler radar ambiguity-resolving rangingmethod based on the jitter repetitive frequency are as follows: (1) obtaining a radar echo signal under the jitter repetitive frequency; (2) performing pulse compression on two pulse group echo signals; (3) performing Doppler filtering on the pulse compression results of the two pulse groups; (4) performing periodic extension on the Doppler filtering results of the two pulse groups in the distance dimension according to the maximum range ambiguity number; (5) performing coherent accumulation on the periodic extension results; (6) performing threshold detection, and performing target discrimination to determine a distance unit corresponding to the true distance of the target; and (7) calculating the true distance of the target and completing the ambiguity-resolving ranging. The pulsed Doppler radar ambiguity-resolving ranging method based on the jitter repetitive frequency can accumulate all the pulses of the two jitter repetitive frequency pulse groups, can improve the detection probability while resolving ambiguity, and can also perform the ambiguity-resolving ranging for the target with small signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a pulse Doppler radar deambiguation distance measurement method based on jitter repetition frequency, which is suitable for the occasion where a PD radar (pulse Doppler radar) performs defuzzification distance measurement on a target. Background technique [0002] PD radar usually works with medium and high repetition frequencies. When the target distance exceeds the maximum unambiguous range of the radar, its echo appears in the off-cycle period, making the measured distance not the real distance, so it is necessary to resolve the range ambiguity. [0003] In the literature [Tan Xiansi, Li Zhihuai, Wang Hong, etc. Application analysis of staggered and dithering defuzzification method [J]. Modern Radar. 2011, 33(5)], the author proposes a method that uses dithering repetition frequency to resolve range ambiguity method, the basic steps are as follows: ...

AI Technical Summary

Problems solved by technology

The defect of this prior art is that the target signal detection is carried out first, and the two pulse groups can only be coherently accumulated separately, and all the pulse information is not fully utilized, so the signal-to-noise ratio will have a certain loss. When the target signal is relatively weak When , the target may not be detected because the signal-to-noise ratio is too low, and the distance blurring cannot be solved in the subsequent process.

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