Echo pulse delay generating device for pulse type radar test

Abstract

The invention discloses an echo pulse delay generating device for a pulse type radar test. A multi-channel phase-shifting clock is creatively utilized to perform high-speed equivalent interpolation sampling on pulse signals; a multi-channel FIFO storage unit is utilized to uninterruptedly store the pulse signals; an interpolation counting method is utilized to realize high-precision delay control output of the inputted pulse signals under a low clock frequency, and therefore, the requirement of back-end test equipment for the delay precision of echo pulse signals can be satisfied; and if a basic clock signal frequency is fIN, a phase-locked loop is utilized to perform M frequency multiplication and N-channel phase shifting, and therefore, equivalent sampling speed can be increased to MNfIN, and the time resolution of the sampled and stored pulse data can be increased by MN times, and thus, the control precision of delay output can be increased to 1 / MNfIN. Compared with a traditional pulse signal delay method, the device of the invention can carry out high-precision control output of pulse signal fixed delay and variable delay, so that flexible simulation of height or distance echo signals can be realized.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and more specifically relates to an echo pulse delay generation device used in the pulse radar height or distance simulation test process. Background technique [0002] Radar is a device that uses electromagnetic waves to detect and measure distance (altitude) and target characteristics. The modulated signal emitted by the radar generates an echo after passing through the target reflector. By analyzing and processing the time-frequency characteristics of the received echo signal, information such as the azimuth, distance and relative change rate of the target reflector relative to the transmitting device can be obtained. [0003] According to its function, radar can be used for altimetry, early warning, search, warning, guidance and other occasions; in terms of working system, it can be divided into primary radar and secondary radar; the frequency of transmitting signals covers from met...

AI Technical Summary

Problems solved by technology

Most of the traditional test methods use fixed-length optical fiber delay lines, SAW delay lines and other devices to delay and forward the transmitted pulse signals (attenuation and detection, comparison and shaping), which can only simulate fixed distance delays, and the test steps are cumbersome. Inefficient and unable to simulate delays with variable range or azimuth

Another test method is to use the method of lifting the target or flying the real aircraft. Although this method is closer to the real working conditions of the pulse radar, it has the disadvantages of inconvenient test platform construction, long test period, and high test cost. place

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