A Method and System for Adaptive Signal Detection in Severely Inhomogeneous Environment
An adaptive signal and detection method technology, applied in the field of signal detection, can solve the problem of low target detection performance, achieve the effect of reducing computational complexity and simplifying the detection process
Active Publication Date: 2021-10-08
AIR FORCE EARLY WARNING ACADEMY
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[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides an adaptive signal detection method in a severely non-uniform environment to overcome the problem of low target detection performance in the prior art
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[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0061] For the system channel number is multi-channel radar, assuming that the radar received echo contains the energy reflected by the target, the radar received data can be used dimensional column vector , and can be written as:
[0062]
[0063] In the formula, dimension matrix represents the signal matrix, dimension vector represents the unknown coordinates of the signal, ...
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The invention discloses an adaptive signal detection method in a severe non-uniform environment: constructing a data vector to be detected, a signal matrix and a training sample matrix; constructing a signal orthogonal matrix according to the signal matrix; constructing a sampling covariance matrix by using the training sample matrix; Use the sampling covariance matrix to construct the whitening matrix; use the whitening matrix to whiten the data vector, signal matrix and signal orthogonal matrix; use the whitened data to construct the intermediate variable; use the intermediate variable to construct the detection statistic; use the detection statistic and false alarm probability to determine the detection threshold; compare the size between the detection statistics and the detection threshold, and judge whether the target exists. The invention can be applied to the detection of subspace signals, can better suppress severe non-uniform clutter, simplifies the detection process, and greatly reduces the computational complexity of the detector. The invention also provides a corresponding adaptive signal detection system in severe non-uniform environment.
Description
technical field [0001] The invention belongs to the technical field of signal detection, and more specifically relates to an adaptive signal detection method and system in a severe non-uniform environment. Background technique [0002] Object detection has always been one of the most important functions of radar. With the continuous improvement and development of radar technology, the resolution of radar is continuously improved, and the size of the corresponding distance resolution unit is getting smaller and smaller, so the number of strong scattering points in each distance unit is gradually reduced, which increases the clutter environment. non-uniform properties. In addition, due to the influence of factors such as mountains, tall man-made buildings, and land-sea handover in the radar detection environment, the radar received data often presents serious non-uniform characteristics, that is, the echo characteristics of different distance units are different, which gives ...
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IPC IPC(8): G01S7/41
CPCG01S7/414
Inventor 刘维建张昭建周必雷李槟槟杜庆磊陈辉王永良
Owner AIR FORCE EARLY WARNING ACADEMY