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Short-pulse non-coherent radar intermediate-frequency echo construction method

A technology of non-coherent radar and construction method, which is applied in the field of intermediate frequency echo construction, and can solve problems such as difficulty in accurately constructing target echoes.

Active Publication Date: 2020-05-12
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a short-pulse non-coherent radar intermediate-frequency echo construction method to solve the problem that it is difficult to accurately construct target echoes in the prior art under the condition of non-coherent radiation signals

Method used

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Embodiment Construction

[0041] For a clearer understanding of the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0042] Research of the present invention comprises the following aspects:

[0043] 1. The phase relationship between signals

[0044] use figure 1 The method shown can obtain the intermediate frequency sampling of the radiation waveform of the short-pulse microwave power source operating at repeated frequency. It is also possible to use a high-end oscilloscope to directly sample and record the radiation waveform of the short-pulse microwave power source, and obtain a specific intermediate frequency signal waveform through signal processing. In the future, the construction of the echo signal will be realized on the basis of the above-mentioned intermediate frequency signal waveform of the radiation source. There are two reasons why the echo is...

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Abstract

The invention discloses a short-pulse non-coherent radar intermediate-frequency echo construction method. According to the method, waveform translation and additional phase compensation are carried out on point target echoes of each pulse radiation by using a stop-jump hypothesis model; waveform translation is divided into integer sampling interval translation and residual sampling interval compensation; the additional phase compensation is used for compensating an echo Doppler effect caused by target motion; the clutter construction comprises the following steps: generating a sample target sequence with specific speed distribution by utilizing a Monte Carlo method according to a set clutter speed distribution spectrum, generating a target echo by utilizing a point target echo generation method, and finally, adjusting weight coefficients of the target echo and the clutter according to a set signal-to-clutter ratio, and adding the weight coefficients to form an overall echo. The echo waveform formed by the invention can be played on a waveform generator or any waveform generator, and can be used as signal input of a radar intermediate-frequency receiver to form a closed loop of technology research and development.

Description

technical field [0001] The invention belongs to the technical field of short-pulse non-coherent radar, and relates to a method for constructing intermediate-frequency echoes. Background technique [0002] From the perspective of radar signal processing, short-pulse non-coherent radar has randomness in the center of the microwave pulse envelope generated by it. The initial phase of each microwave pulse is random, and the center frequency also has random jitter between pulses. Therefore, a short-pulse non-coherent radar operating at repeated frequencies is a completely non-coherent system. [0003] During the development of short-pulse non-coherent radar receiver and the research of signal processing technology, the test of intermediate frequency signal is an important part of the whole system test. The radar intermediate frequency signal can be used for the joint debugging of the intermediate frequency receiver, it can be used to test the correctness and execution speed of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/4021G01S7/4052
Inventor 汪海波黄文华巴涛姜悦邵浩
Owner NORTHWEST INST OF NUCLEAR TECH
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