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Robust Space-Time Beamforming Method and System for Airborne Radar under Steering Vector Mismatch

A technology of steering vector mismatch and airborne radar, which is applied to radio wave measurement systems and instruments, and can solve the problems of STAP output signal-to-noise ratio performance degradation

Active Publication Date: 2018-03-06
SHENZHEN UNIV
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Problems solved by technology

[0006] In view of the deficiencies in the prior art above, the purpose of the present invention is to provide a robust space-time beamforming method and system for airborne radar under mismatched steering vectors. When there is a deviation in the Puler frequency estimation, the output signal-to-noise ratio performance of STAP will be severely degraded

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  • Robust Space-Time Beamforming Method and System for Airborne Radar under Steering Vector Mismatch

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[0047] The present invention provides an airborne radar robust space-time beamforming method and system under steering vector mismatch. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0048] Please refer to figure 1 , which is a flow chart of a preferred embodiment of the airborne radar robust space-time beamforming method under steering vector mismatch according to the present invention. Such as figure 1 shown, said

[0049] Step S100, initializing the flight altitude and speed of the airborne platform and the angle of arrival of the target echo signal, and determining the Doppler frequency of the radar echo signal;

[0050] Step S200, establis...

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Abstract

The invention provides an airborne radar robust space-time beam forming method and a forming system under steering vector mismatch. The method comprises steps: a flight altitude and a speed of an airborne platform and an arrival angle of a target echo signal are initialized, and a Doppler frequency of a radar echo signal is determined; a receiving signal model for an array antenna is built and according to the arrival angle of the radar echo signal and the estimation value of the Doppler frequency, a space-time integral covariance matrix is built; according to the space-time integral covariance matrix, clutter plus noise subspace is determined; a target function and constraint conditions for a steering vector estimator are built, and according to a semi-definite programming relaxation method, the actual steering vector of the target echo signal is solved and obtained; and according to a minimum variance distortionless method, a weight coefficient for the array antenna is acquired. The optimal estimated value of the expected target steering vector can be acquired, a beam former succeeds in suppressing clutters and forms beams only in the expected target direction, amplification of noise power is avoided, and the output signal to noise ratio of the beam former is thus expanded.

Description

technical field [0001] The invention relates to the technical field of array antennas and airborne radars, in particular to a robust space-time beamforming method and system for airborne radars under steering vector mismatch. Background technique [0002] The main task of airborne radar is to identify and track the desired target in a complex background environment. Therefore, it is necessary to form a null at the ground clutter and form a beam at the target. Due to the movement of the airborne platform, the ground clutter spectrum of the airborne phased array radar shows the characteristics of main clutter broadening in the Doppler frequency domain. In addition, the ground clutter spectrum has a coupling relationship in the space domain and the time domain. Neither conventional time-domain nor space-domain filters are capable of forming a notch that matches ground clutter. Space-Time Adaptive Processing (STAP) technology can jointly suppress ground clutter from two-dimens...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/28
CPCG01S7/2813
Inventor 黄磊李强张基宏张沛昌廖斌赵博周汉飞
Owner SHENZHEN UNIV
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