Method for acquiring micro motion information of spatial target based on random stepped frequency signal

A technology of space target and acquisition method, applied in the field of space target micro-motion information acquisition based on random step frequency signal, can solve the problems of invalid processing method, large amount of data, burden of radar system, etc., and achieve reduced pressure and application range. The effect of reducing the width and the amount of sampled data

Active Publication Date: 2017-07-28
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

The data to be collected includes echo data of each sub-frequency point and slow-time sampling data. The data volume is relatively large, which will bring a great burden to the radar system in terms of signal generation equipment, signal processing equipment and data storage; In the process, there is a loss of frequency point sampling data, and the traditional processing method will fail

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  • Method for acquiring micro motion information of spatial target based on random stepped frequency signal
  • Method for acquiring micro motion information of spatial target based on random stepped frequency signal
  • Method for acquiring micro motion information of spatial target based on random stepped frequency signal

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Embodiment Construction

[0039] The invention is applicable to the acquisition of micro-motion information of space objects. figure 1 It is a brief flow chart of the present invention, and the method proposed in the present invention will be further explained below in conjunction with the accompanying drawings. The specific steps and effects of this method are as follows:

[0040] Step 1: First transmit a random step frequency signal;

[0041] Randomly extract M (M figure 2 As shown in , the time-frequency schematic diagram of the stepped frequency signal is given, and the black part is the randomly extracted transmit frequency signal.

[0042] The random step frequency transmission signal can be expressed as:

[0043]

[0044] in, t p Indicates the sub-signal pulse width, and T indicates the sub-signal pulse repetition time.

[0045] Step 2: Obtain the HRRP of the target through compressed sensing sparse reconstruction of the received random step frequency signal echo;

[0046] Write the sa...

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Abstract

The invention relates to a method for acquiring micro motion information of a spatial target based on a random stepped frequency signal. The method includes a first step of transmitting a random stepped frequency radar signal; a second step of performing sparse reconstruction of the received random stepped frequency radar signal echo using the compressed sensing technology to obtain a high resolution range profile, hereinafter referred to as HRRP, of a target; a third step of executing the first and second steps for the random stepped frequency echo signal in a slow time domain to obtain a slow time-HRRP spectrum of the target; and a fourth step of subjecting the obtained slow time-HRRP spectrum of the target to a parameter extraction algorithm such as time-frequency analysis to acquire micro motion information of the target. The invention has the beneficial effects of firstly, reducing the sampling data size in the micro motion feature extraction using the compressed sensing technology and mitigating the pressure of data storage; secondly, saving frequency resource and mitigating the pressure of a signal producing device; and thirdly, having a wide range of application, and being capable of application to the processing of partially missed sampling data of conventional stepped frequency signals likewise.

Description

【Technical field】 [0001] The invention belongs to the field of radar signal processing, specifically relates to a micro-movement target signal processing technology, and further proposes a method for acquiring micro-motion information of a space target based on a random step frequency signal for a space target. 【Background technique】 [0002] As one of the important features of space target recognition, the measurement and analysis of micro-motion parameters is of great significance. In darkroom measurement experiments, stepping frequency signals are often used, and signal processing methods such as time-frequency analysis are performed on the obtained slow time echo signals to obtain target micro-motion parameters. The data to be collected includes echo data of each sub-frequency point and slow-time sampling data. The data volume is relatively large, which will bring a great burden to the radar system in terms of signal generation equipment, signal processing equipment and ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292G01S13/28
CPCG01S7/2923G01S13/28
Inventor 刘进吴其华赵锋艾小锋杨建华李永祯冯德军徐振海肖顺平
Owner NAT UNIV OF DEFENSE TECH
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