Airborne single-station passive positioning method for multiple broadband targets

Abstract

The invention discloses an airborne single-station passive positioning method for multiple broadband targets and mainly solves the problem that multiple broadband radiation source targets cannot be subjected to single-station passive positioning in the prior art. The method comprises the following implementation steps: (1) sampling a far-field broadband radiation source signal at the receiving end to obtain an observation signal; (2) performing band narrowing on a broadband observation signal received by an array element through FRFT; (3) building a signal vector I(k) of a k-th signal in an FRFT domain; (4) obtaining a time average autocorrelation matrix for the k-th signal by utilizing the signal vector I(K), and performing eigen value decomposition; (5) building a guide matrix in a distance form of the k-th signal; (6) performing sampling at the receiving end for L times, repeatedly executing the steps of (2) to (5), and searching a target function for a maximum value, wherein (xk,yk,zk) corresponding to a maximum value point serves as the coordinates of a target k. According to the airborne single-station passive positioning method for the multiple broadband targets, the multiple broadband radiation source targets can be subjected to single-station passive positioning. The method can be used for detecting and reconnoitering an unmanned flight platform and a manned flight platform.

Description

technical field

[0001] The invention belongs to the technical field of radar, and in particular relates to a broadband multi-target airborne single-station passive positioning method, which can be used for passive positioning of multi-radiation source targets in the fields of electronic reconnaissance monitoring and long-distance early warning detection. Background technique

[0002] Active equipment such as radar, sonar, etc., actively emit electromagnetic wave signals and receive echo signals reflected from targets. The echo signals contain target position information, and further calculations can achieve target positioning. This method of achieving target positioning by emitting electromagnetic signals from the equipment itself is called active positioning. Compared with active positioning, passive positioning, which does not actively transmit signals but passively receives one-way target radiation source signals, has the advantages of long range and strong concealment, a...

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