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Multi-target direct positioning method for non-circular signals

A non-circular signal and positioning method technology, applied in positioning, measuring devices, instruments, etc., can solve the problems of threshold effect, insufficient use of signals, and difficulty in asymptotically optimal estimation performance, so as to avoid threshold effect and measure data Linking problems, avoiding multidimensional nonlinear optimization problems, and reducing complexity

Active Publication Date: 2017-10-24
THE PLA INFORMATION ENG UNIV
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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

Method used

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  • Multi-target direct positioning method for non-circular signals
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  • Multi-target direct positioning method for non-circular signals

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Embodiment 1

[0065] Embodiment one, such as figure 1 As shown, the multi-target direct positioning method for non-circular signals disclosed in the present invention requires the vehicle-mounted observation station to install an antenna array, requires the observation station to receive the non-circular signal data of the target in multiple time slots, and the observation station reuses the non-circular signal data of the signal. Features directly estimate the location parameters of multiple targets.

[0066] Such as figure 2 As shown, the present invention provides a multi-target direct positioning method for non-circular signals, comprising the following steps:

[0067] Step 1. According to the Nyquist sampling theorem, the radio signal data radiated by the target is collected from the M-channel array antenna receiving system within K time slots. Under the condition of two-dimensional positioning, K is a natural number greater than or equal to 2. Under the condition of three-dimensiona...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/04
CPCG01S5/04
Inventor 尹洁昕王鼎吴瑛杨宾张莉唐涛吴志东刘瑞瑞
Owner THE PLA INFORMATION ENG UNIV
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