Multi-target direct positioning method for non-circular signals

Abstract

The invention belongs to the radio signal positioning method technical field and relates to a multi-target direct positioning method for non-circular signals. According to the method, the extended covariance matrix of time-domain signals is obtained according to the non-circular characteristics of the signals and on the basis of a time-domain array signal model; noise subspaces in each time slot are calculated through using the extended covariance matrix; the data of the plurality of subspaces are fused on the basis of the orthogonality of the extended subspaces in each time slot, and therefore, an optimization model for each target position is built; and a Gauss-Newton iterative algorithm is designed to realize the precise positioning of each target sequentially. With the multi-target direct positioning method for the non-circular signals provided by the invention adopted, multi-target position estimation accuracy can be improved. The advantages of the method in positioning accuracy become more obvious with the decrease of a signal-to-noise ratio or the decrease of sample points; and the method can process a larger number of targets.

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 for non-circular signals. Background technique [0002] As we all know, radio signal positioning is of great significance for target discovery and situational awareness, and it is widely used in many engineering science fields such as communication signal reconnaissance, electronic information countermeasures, radio monitoring, telemetry and navigation. The traditional method of direction finding first and then positioning belongs to the "two-step positioning" mode. This positioning mode has the advantages of simple calculation process and convenient engineering implementation. It is currently being widely used in many radio signal positioning systems. However, the "two-step localization" mode has some inherent disadvantages: for example, the estimation performance is difficult to achieve asymptotically optim...

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Problems solved by technology

However, the "two-step localization" mode has some inherent disadvantages: for example, it is difficult to achieve asymptotically optimal estimation performance, there is a threshold effect, and measurement data association is required under multi-objective conditions, etc.

Considering that although the subspace data fusion algorithm based on a single motion observation array has low complexity, it does not make full use of the waveform characteristics of the signal, the present invention discloses an improved direct positioning method for non-circular signals, which can not only overcome the traditional The shortcomings of the two-step positioning method, but also has a higher positioning accuracy than the existing subspace data fusion algorithm, and can achieve accurate positioning of more targets

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