Parameter Tunable Detector for Signal Mismatch in Clutter and Interference Coexistence Environments

Abstract

The invention discloses a target detection method for solving the problem of signal mismatch in a multi-channel airborne active phased array radar in the coexistence environment of clutter and interference. The method introduces adjustable parameters, and realizes flexible detection of mismatched signals by adjusting the adjustable parameters. First, use the training samples to form a sampling covariance matrix, and then use the sampling covariance matrix to quasi-whiten the data to be detected, the interference matrix, and the signal matrix, and use the quasi-whitened interference matrix, signal matrix, and data to be detected, combined with adjustable parameters to form parameters Adjustable detector. The detector designed by the present invention can realize clutter suppression, interference suppression and target detection at the same time, the detector has the characteristic of constant false alarm, no additional constant false alarm processing steps are required, and the detector can flexibly detect the mismatched signal, and it can be used in the suppression of clutter. At the same time of reducing the adjustable parameter, the robust detection of the mismatched signal can be realized; on the contrary, the suppression of the mismatched signal can be realized by increasing the adjustable parameter.

Description

technical field [0001] The invention relates to a parameter-adjustable detector under the coexistence environment of clutter and interference when signals are mismatched, and is particularly suitable for multi-channel airborne active phased array radar. Background technique [0002] The airborne radar can overcome the influence of the curvature of the earth and provide an earlier warning time due to the lift-off of the airborne platform. However, the movement of the carrier aircraft causes the Doppler frequency of the radar ground-sea clutter to widen seriously, and the intensity is large, which seriously affects the detection performance of the airborne radar. At the same time, in the working environment of airborne radars, there are often intentional interference from the enemy, interference from other co-frequency radars, or interference caused by industrial production. In addition, due to the processing and installation industry of the radar antenna array, the radar ant...

AI Technical Summary

Problems solved by technology

However, the movement of the carrier aircraft causes the Doppler frequency broadening of the radar ground-sea clutter to be severe and strong, which seriously affects the detection performance of the airborne radar

At the same time, in the working environment of airborne radar, there are often intentional interference from the enemy, interference from other radars of the same frequency, or interference caused by industrial production.

In addition, due to the radar antenna array processing and installation industry, the radar antenna often has array errors, which leads to signal mismatch, that is, the actual steering vector of the target is inconsistent with the system assumption value

Images