Method for adaptively resisting spatial distribution interference based on logarithmic frequency offset frequency diversity array

Abstract

The invention discloses a method for adaptively resisting spatial distribution interference based on a logarithmic frequency offset frequency diversity array, and mainly solves a problem that the periodic spectral peak of a conventional fixed frequency offset frequency diversity array in a distance dimension causes the decrease of the anti-interference performance. The implementation scheme of theinvention is that the method comprises the steps: constructing the logarithmic frequency offset frequency diversity array, and emitting a signal through the logarithmic frequency offset frequency diversity array; carrying out the separation and rearrangement of the signal and extracting a receiving end normalization guide vector; obtaining an adaptive wave beam forming weight vector according tothe normalization guide vector and a received data autocorrelation matrix through a linear minimum constraint variance criterion; finally carrying out the beam forming through the adaptive wave beam forming weight vector, wherein an obtained directional diagram guarantees the single mapping of the beam spectral peak and a target position while achieving the resisting of the spatial distribution interference. The method can guarantee the single mapping of the beam spectral peak and the target position while achieving the resisting of the spatial distribution interference, and can be used for target tracking.

Description

technical field [0001] The invention belongs to the technical field of radar anti-interference, and further relates to a suppression method for spatially distributed interference, which can be used for target tracking. Background technique [0002] As an important part of electronic attack, electronic jamming has developed rapidly in recent years and has various forms. With the development of unmanned aerial vehicles, airships, etc., small jammers using them as carriers are widely used, and the distributed interference formed by a large number of small jammers in space poses a serious threat to the normal operation of radar. It is urgent to find ways to effectively counteract spatially distributed interference. [0003] Frequency diversity array is a relatively new type of array system. The simplest model is to introduce a fixed frequency offset between the transmitting carrier frequencies of adjacent array elements on the basis of a linear array with uniform distribution o...

AI Technical Summary

Problems solved by technology

Adaptive beamforming using the simplest frequency diversity array model can form a suppression null at the interference position, but the pattern formed under the simplest model has distance periodicity, so that when the radar detection distance is long, the distance dimension will change Multiple periodic spectral peaks appear, and when interference appears at these spectral peak positions, the anti-jamming performance of the radar will drop sharply

Images