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Multi-radiation sources passive direct time difference positioning method based on subspace decomposition

A technology of subspace decomposition and multi-radiation sources, applied in the field of passive direct time-difference positioning of multi-radiation sources, can solve problems such as low precision, inability to be strictly constrained, and unstable algorithms, and achieve high positioning accuracy

Active Publication Date: 2019-01-18
TONG FANG ELECTRONICS SCI & TECH +1
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Problems solved by technology

[0003] However, the two-step method will introduce estimation errors when estimating the intermediate parameters, resulting in low accuracy of using the intermediate parameters to calculate the position of the radiation source under the condition of low signal-to-noise ratio; It is also necessary to solve the correlation problem of multiple sets of intermediate parameters, which leads to the algorithm not being robust; in addition, the multiple sets of intermediate parameters estimated by the two-step method cannot be strictly restricted to one point geometrically due to the estimation error, resulting in the estimation result being within a region , reducing the algorithm resolution
Therefore, when there are multiple radiation source signals with time-frequency overlapping, intermediate parameters such as the arrival time difference or arrival frequency difference of each radiation source signal are difficult to estimate, distinguish and pair between stations one by one, which makes the two-step method no longer applicable

Method used

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  • Multi-radiation sources passive direct time difference positioning method based on subspace decomposition
  • Multi-radiation sources passive direct time difference positioning method based on subspace decomposition
  • Multi-radiation sources passive direct time difference positioning method based on subspace decomposition

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Embodiment

[0040] In this example, four observation stations whose Cartesian coordinates are (-250,-150) meters, (-250,150) meters, (250,150) meters and (250,-150) meters respectively receive signals to the area surrounded by the observation stations Take three co-frequency radiation sources (-100, -100) meters, (-150, 120) meters, and (200, -50) meters as an example to investigate the positioning effect of the present invention.

[0041] In order to investigate the ability of the positioning method of the present invention to suppress errors, the received signals of the 4 observation stations all include zero-mean additive Gaussian white noise, the signal-to-noise ratio is set to 20dB, the radiation source signal bandwidth is 2MHZ, and the number of discrete Fourier transform frequency points is 32, the number of observed signal frames is 1280 frames.

[0042] The flow of this example is as follows:

[0043] Step 1: Initialize the settings, set the search grid x=-250:3:250 meters, y=-1...

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Abstract

The present invention relates to the technical field of signal and information processing, and to a multi-radiation sources passive direct time difference positioning method based on subspace decomposition. The method adopts a passive direct time difference positioning method, does not estimate intermediate parameters, avoids introducing intermediate parameters estimation error and intermediate parameters matching between multiple stations, so that solves the problem that a two-step method is no longer applicable in the scene of locating a plural of time-frequency overlapping radiation sources, and as for resolution problem of multiple radiation sources, the method adopts a super-resolution positioning method based on subspace decomposition to improve resolution of positioning.

Description

technical field [0001] The invention belongs to the technical field of signal and information processing, and relates to a multi-radiation source passive direct time-difference positioning method based on the subspace decomposition of the sample covariance matrix of the observation network received signal. Background technique [0002] At present, most passive positioning techniques can be divided into two categories: two-step method and direct method. The two-step method first uses the received signals of multiple observation stations to estimate intermediate parameters such as the angle of arrival, time difference of arrival, or frequency difference of arrival of the signal, and then uses geometric methods or statistical methods to estimate the position of the radiation source. The direct method does not estimate these intermediate parameters, but directly establishes a parametric data model represented by the position of the radiation source, and estimates the position of...

Claims

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Application Information

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IPC IPC(8): G01S5/00
CPCG01S5/00
Inventor 彭志华郝克钢万群陈向明王长生郭贤生刘翼鹏庄杰
Owner TONG FANG ELECTRONICS SCI & TECH
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