Multi-target direct positioning method in line-of-sight and non-line-of-sight hybrid scene

Abstract

The invention relates to the positioning method technology field for radio signals, and especially relates to a multi-target direct positioning method based on a single array observation station in a line-of-sight and non-line-of-sight hybrid scene. The method includes the following steps: firstly, on the basis of a single-hop multipath transmission model, establishing an array signal model associated with target position parameters through a mathematical relationship, associated with the target position parameters, between a multipath signal angle of arrival and a time delay; secondly, converting multi-station array antenna reception data into frequency domain data through a radix-2 FFT algorithm, and establishing a mathematical optimization model of joint estimation target position parameters and transmission coefficients on the basis of sub-space orthogonal criteria; and finally, extracting information matrixes that only include target positions, and carrying out network search by taking the minimum characteristic value of the minimum information matrix as a target function, so accurate positioning of multiple targets in a multipath scene is realized. The method provided by the invention substantially increases the target positioning precision, and avoids identification and data association problems of non-line-of-sight.

Description

technical field [0001] The invention relates to the technical field of a positioning method for radio signals, in particular to a multi-target direct positioning method based on a single array observation station in a direct and non-direct mixed scene. Background technique [0002] As we all know, radio signal positioning technology is of great significance for target discovery and situational awareness, and is widely used in many engineering science fields such as wireless communication, telemetry and navigation. After decades of development, the technology has made great progress in theory and engineering applications. According to the number of observation stations, the radio signal positioning system can be divided into two categories: single station positioning and multi-station positioning. The former has the advantages of simple system, high flexibility, no need for information synchronization and communication transmission, etc., while the latter can provide More ob...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of low target positioning accuracy in direct and non-direct scenarios in the prior art, the present invention provides a multi-target direct positioning method in mixed direct and non-direct scenarios to significantly improve target positioning accuracy under NLOS propagation conditions

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