Estimation method of arbitrary array weak signal source angle under strong interference

Abstract

The invention discloses an estimation method of an arbitrary array weak signal source angle under strong interference, i.e., a modified projection blocking method, which is used for researching estimation of the weak signal angle under strong interference. The method does not need to accurately know an interference angle, has no array limit, is suitable for an arbitrary array, and has good estimation performance under the condition with array errors. Compared with the interference blocking method, the method saves the problem that different arrays need to construct different blocking matrixes, and does not lose the degree of freedom during blocking interference. Compared with the traditional noise subspace expansion method, the method has higher angle-measuring accuracy under the condition of a low signal to noise ratio.

Description

technical field

[0001] The invention belongs to the technical field of array antennas, and in particular relates to a method for estimating the angle of a weak signal source in an arbitrary formation under the background of strong interference. Background technique

[0002] At present, weak signal detection and parameter estimation methods based on array antennas are being widely used in many fields such as radar, communication, navigation, sonar and seismic detection. Array antenna technology has the advantages of flexible beam control, high signal gain, strong anti-interference ability and high super-resolution ability, so it has attracted great attention.

[0003] Strong interference and low SNR environment will directly affect the detection and estimation of weak signals. Especially in the case of strong interference, the signal is very weak relative to the interference, and the weak signal is submerged by the strong interference, which cannot be detected accurately. E...

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