A Method and System for Velocity Blurring Based on Pulse Accumulation and Frame Double Frequency Resolution

Abstract

The invention discloses a pulse accumulation frame based dual frequency velocity ambiguity resolution method and system. The system includes an emission subsystem and a receiving subsystem; a basebandsignal generation module generates a Barker code or a chirp signal to output to a microwave transmitting module, and the microwave transmitting module performs frequency mixing on the received baseband signal to modulate to a microwave frequency band, and outputs the microwave frequency band to an external antenna to radiate into space after power amplification; a microwave receiving module converts an echo signal input by a receiving antenna from the microwave frequency band into intermediate frequency, and outputs the intermediate frequency to an intermediate frequency receiving module to perform intermediate frequency signal gain control, so that the intermediate frequency signal amplitude level output to a signal processing module can be controlled within an appropriate range; and thesignal processing module adjusts pulse repetition rates between frames according to the types of pulse accumulation frames, alternatively accomplishes the velocity measurement frame accumulation of high repetition frequency and the velocity measurement frame accumulation of low repetition frequency, generates corresponding synchronous pulses to output to other modules, and completes signal acquisition, pulse compression accumulation and target detection functions as well.

Description

technical field [0001] The present invention relates to the technical field of radar, in particular to a method and system for speed ambiguity solution based on pulse accumulation frame dual frequency. Background technique [0002] Space-based tracking radar is mainly for target detection and measurement of non-cooperative targets in space. For high-speed moving targets, ultra-long-range tracking radar will have the problem of fuzzy distance and speed measurement. Existing velocity de-blurring mainly adopts DSP software processing method. When the radar is interfered or the detection signal-to-noise ratio is low, it is difficult to judge the order of velocity ambiguity. [0003] In the existing patent, "TPRF method of Doppler weather radar retreat velocity ambiguity" (application number: 201010270482.4) discloses a multi-pulse repetition frequency detection technology, selecting three suitable pulse repetition frequencies to form two DPRF detections , and calculate the actu...

AI Technical Summary

Problems solved by technology

[0006] The invention can solve the problem of ambiguity and contradiction of ultra-long-distance detection distance and speed, and is applied to the fields of space-based non-cooperative target tracking and measurement such as satellites and space stations, and can directly obtain measurement information such as the distance and speed of the target

Images