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A Pulse Compression Method for Phase-coded Modulated Signals

A pulse compression and phase encoding technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of Doppler effects of echo signals, and achieve the effect of easy system implementation

Active Publication Date: 2017-01-11
10TH RES INST OF CETC
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art, to provide a pulse compression processing method for phase-coded modulation signals that is not affected by echo Doppler frequency shift and can be implemented by applying Fast Fourier Transform, so as to solve the problem of phase-coded signals. Doppler Influence of Radar Echo Signal in Pulse Compression

Method used

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  • A Pulse Compression Method for Phase-coded Modulated Signals
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  • A Pulse Compression Method for Phase-coded Modulated Signals

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Embodiment Construction

[0016] refer to figure 1 . At the radar signal receiving end, the phase code modulation signal pulse compression processing circuit includes a serially connected quadrature demodulation module 1 and a low-pass filter module 2, and a pulse compression module connected in series between the low-pass filter module 2 and the target detection module 4 3. Among them, the quadrature demodulation module 1 includes a local oscillator and a 90° phase shifter connected in parallel between two loads, and the low-pass filter module 2 includes at least two parallel low-pass filters, and the two loads are connected through two parallel The low-pass filters form a parallel closed-loop loop, and the common end of the two parallel low-pass filters is serially connected with the pulse compression module 3 and the target detection module 4 . During the echo pulse compression process of the phase code modulation signal, the radio frequency received signal passes through the low-pass filter connec...

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Abstract

The invention discloses a pulse compression method of a phase-coding modulating signal. The pulse compression method comprises the following steps of: in an echo-pulse compression treatment process of the phase-coding modulating signal, enabling a radio frequency receiving signal to pass through low-pass filters which are connected in parallel in a quadrature demodulating module (1) and a low-pass filter module (2), feeding converted base band signals into a pulse compression module (3), performing pulse compression on the base band data by taking each sampling point as datum, and feeding the pulse compression data value corresponding to the sampling points to a target detecting module (4), performing threshold comparison processing on the pulse-compressed data, outputting target detecting information obtained by threshold comparison to a subsequent information processing unit to complete pulse compression processing of the radar echo signal at one sampling point. According to the pulse compression method disclosed by the invention, by virtue of conjugate point multiplication of the local sequence and the echo signal sequence, the aligned received echo signal is converted into a signal frequency signal, so that a Doppler influence problem of the phase-coding radar echo signal in pulse compression is solved.

Description

technical field [0001] The invention relates to a pulse compression processing method mainly used in a radar receiving system for phase code modulation signals. Background technique [0002] Pulse compression is an important system of modern radar, it effectively solves the contradiction between radar range resolution and average power, and is widely used in modern radar. The pulse compression processing requirements of these radar systems for phase code modulation signals are that they can transmit long sequences of phase modulation pulses to increase the average power of the transmitted signal, and obtain a sufficiently long detection distance, and the Doppler effect on the target in pulse compression processing is not significant sensitive. The application of this technology enables the radar to increase the average power of the transmitted signal by transmitting wide pulses when the signal is transmitted, and obtain a sufficiently far maximum detection distance, while u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/32
CPCG01S7/32
Inventor 张剑周兴建卢建川
Owner 10TH RES INST OF CETC
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