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A Preprocessing Method of Broadband Radar Direct Acquisition Data

A data preprocessing, broadband radar technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of complex processing methods, large amount of calculation, low processing efficiency, etc., to achieve simple and clear principles, improve reliability, and operability strong effect

Active Publication Date: 2021-04-13
NO 63921 UNIT OF PLA
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Problems solved by technology

However, there are not many researches on the processing algorithm of direct acquisition data. The mainstream processing method is to convert the echo into deskewing data through digital deskewing. When imaging and feature extraction are carried out through traditional methods, this processing method is relatively Complicated, large amount of calculation, low processing efficiency
[0005] At present, there is no convenient and efficient processing method for direct collection data

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  • A Preprocessing Method of Broadband Radar Direct Acquisition Data
  • A Preprocessing Method of Broadband Radar Direct Acquisition Data
  • A Preprocessing Method of Broadband Radar Direct Acquisition Data

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Embodiment Construction

[0037] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0038] The present invention provides a kind of broadband radar direct acquisition data preprocessing method, and its process is as follows figure 1 shown, including the following steps:

[0039] S1. Perform slow-time down-sampling arrangement on the echo data of the broadband radar; the following specific examples are used to illustrate this step, and the specific examples are not used to limit the protection scope of the present invention.

[0040] For example, during a period of time, the radar tracks a certain target group and obtains M echo data, and the slow time instant t corresponding to the M echo data respectively 1 ,t 2 ,...,t M , each echo data is a time series s(t m ,n),n=1,2,...,N.

[0041] Generally, the pulse repetition frequency of the target characteristic radar can reach hundreds of hertz, that is, hundreds of echoes are generated i...

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Abstract

The invention discloses a method for preprocessing data directly collected by a broadband radar, which can perform convenient and efficient preprocessing on the data directly collected by a broadband radar. The steps are as follows: slow-time down-sampling arrangement is performed on the echo data of the wideband radar. Digital demodulation and pulse compression are performed sequentially on each column of data in the echo data after the slow-time down-sampling arrangement. For the processed echo data, the method of calculating the maximum point is used to draw the target airspace distribution scatter diagram. Select a set number of points belonging to the target to be analyzed in the target airspace distribution scatter diagram. Fit the selected points, calculate the distance offset of the target according to the fitting result, and perform distance compensation for all maximum points according to the distance offset. Determine whether the 2-norm of the fitting function of the scattered points belonging to the target to be analyzed is less than the set threshold δ, and if so, intercept the signal area where the target to be analyzed is located, that is, obtain the measurement data of the target to be analyzed.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a method for preprocessing data directly collected by broadband radar. Background technique [0002] Radar can obtain a higher distance resolution capability by transmitting a large bandwidth signal, which can provide a more reliable basis for target characteristic measurement and identification of true and false targets. Therefore, broadband radar plays a very important role in strategic early warning and anti-missile systems. [0003] According to the Nyquist sampling law, it is necessary to provide a sampling rate greater than twice the bandwidth in order to retain all the information in the echo signal without loss, which puts forward high requirements for the read and write storage capabilities of the hardware. Restricted by technological development, early broadband radars usually adopted the method of de-slanting reception. By removing the inherent FM slope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/292
CPCG01S7/2925G01S7/2927
Inventor 华煜明金胜王洋张健黄璐孙斌
Owner NO 63921 UNIT OF PLA
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