Radar pulse signal sampling jitter real-time elimination processing method

Abstract

The invention provides a radar pulse signal sampling jitter real-time elimination processing method and aims to solve image jitter and distance shake caused by sampling jitter. The method is characterized in that a pulse phase acquisition and storage module, a system clock and sampling pulse phase relationship decision module and a sampling signal delay and output module are designed in FPGA; values after frequency division clock sampling respectively pass through a shift register; the trigger signal values acquired by a frequency division clock in the shift registers are respectively read bythe system clock and sampling pulse phase relationship decision module, according to the combination relationship of the values in the shift registers, the system clock and sampling pulse phase relationship is determined, and the determination result is sent to the sampling signal delay and output module; appropriate output delay is looked up in a lookup table by the sampling signal delay and output module, output pulses strictly synchronized with the system clock are generated, and thereby the radar pulse signal sampling jitter is eliminated in real time.

Description

technical field [0001] The invention relates to a real-time elimination processing method for radar pulse signal sampling jitter. Background technique [0002] In the radar system, the timing generation module usually generates various timing signals in the system, such as pulse repetition period PRT signal, cyclic pulse accumulation CPI signal, AD sampling synchronization signal, channel pulse generation signal LFM_ and other pulse signals. These signals pass through Media such as cables and printed boards are transmitted to each processing module in the system, so that they can work together according to a unified sequence. Pulse-to-pulse phase measurement accuracy is generally an important specification for advanced radar systems. Along with the need to accurately measure pulse frequency, the accuracy of pulse-to-pulse phase measurement depends on four key factors: phase noise, overall measurement time, pulse edge definition and measurement point, and signal-to-noise rat...

AI Technical Summary

Problems solved by technology

[0006] The task of the present invention is to propose a real-time elimination processing method for radar pulse signal sampling jitter from the perspective of data processing without increasing the radar system architecture and hardware, which can significantly reduce the phase noise caused by radar pulse signal sampling jitter. Deterioration and loss of signal-to-noise ratio, solve a series of problems in real time, such as radar altimetry jumping caused by sampling jitter, SAR image azimuth shake, defocus problem, single pulse image Doppler domain shake and ranging jump, etc., to achieve the goal precise imaging and stable tracking

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