Moving target detection and parameter estimation method based on reconstructed signals and 1-norm

A technology for moving target detection and signal reconstruction, applied in radio wave measurement systems, instruments, etc., can solve the problems of increased parameter estimation error and Doppler resolution reduction, and achieve the effect of improving estimation accuracy

Inactive Publication Date: 2014-04-30
CIVIL AVIATION UNIV OF CHINA
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Problems solved by technology

When the number of pulses transmitted by the airborne radar is small, the Doppler resolution of the space-time adaptive processing system will decrease, and the parameter estimation error will increase.

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  • Moving target detection and parameter estimation method based on reconstructed signals and 1-norm
  • Moving target detection and parameter estimation method based on reconstructed signals and 1-norm
  • Moving target detection and parameter estimation method based on reconstructed signals and 1-norm

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[0021] The moving target detection and parameter estimation method based on the reconstructed signal and 1-norm provided by the present invention will be described in detail below with reference to the accompanying drawings and specific examples.

[0022] figure 1 The flow chart of the moving target detection and parameter estimation method based on reconstructed signal and 1-norm provided by the present invention.

[0023] Such as figure 1 As shown, the moving target detection and parameter estimation method based on reconstructed signal and 1-norm provided by the present invention includes the following steps carried out in order:

[0024] 1) Perform clutter suppression on the total echo data received by the airborne radar, and obtain the S1 stage of the data after clutter suppression:

[0025] In this stage, the inverse covariance matrix estimation method is used for clutter suppression; that is, firstly, the clutter covariance matrix of the range gate to be detected is o...

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Abstract

The invention discloses a moving target detection and parameter estimation method based on a reconstructed signal and 1-norm. The method comprises the first step of performing clutter rejection on total echo data received by an airborne radar to obtain data after the clutter rejection, the second step of reconstructing one target signal with a speed value as a variable, the third step of constructing a cost function by utilizing the reconstructed signal obtained from the second step and the 1-norm of the data, after the clutter rejection, obtained from the first step, and the fourth step of searching for speeds so as to allow the speed value when the cost function achieves the minimum value to be an estimation result. In the method, the target signal is reconstructed according to a moving target space-time data model, and then the cost function is constructed by utilizing the reconstructed signal and the 1-norm of the data after the clutter rejection, so that parameter estimation of a moving target is completed. According to a simulation experiment, it is proved that accurate moving target parameter estimation results can be obtained through the method under the condition that the number of pulses transmitted by the airborne radar is limited.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to a moving target detection and parameter estimation method based on reconstructed signal and 1-norm. Background technique [0002] In modern warfare, high-performance airborne radar has become one of the indispensable technical equipment. Since the airborne radar is set up on the high-altitude aircraft, the visual range of targets such as aircraft, especially low-altitude flying targets, is much longer than that of ground-based radars. It also has the advantages of large coverage, long detection distance, and flexible maneuverability. And other characteristics, so it can be used for important tasks such as security and command. At present, the digital frequency measurement methods that use airborne radar to estimate the Doppler frequency of moving targets mainly include FFT frequency measurement method, phase frequency measurement method, instantaneous autocorrela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/414G01S7/415
Inventor 李海吴仁彪郑景忠贾琼琼
Owner CIVIL AVIATION UNIV OF CHINA
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