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Direct positioning method based on external radiation source time delay and Doppler frequency

A technology of Doppler frequency and external radiation source is applied in the field of direct positioning based on the time delay of external radiation source and Doppler frequency, which can solve the problems of insufficient utilization of signal information and insufficient precision.

Inactive Publication Date: 2016-04-13
THE PLA INFORMATION ENG UNIV
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Problems solved by technology

[0006] The present invention overcomes the problems of insufficient accuracy of the traditional two-step positioning method under the condition of passive positioning of the existing external radiation source and insufficient utilization of the direct wave signal information of the external radiation source in the existing direct positioning method in the prior art, and provides a method based on external radiation Direct localization method of source time delay and Doppler frequency

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  • Direct positioning method based on external radiation source time delay and Doppler frequency
  • Direct positioning method based on external radiation source time delay and Doppler frequency
  • Direct positioning method based on external radiation source time delay and Doppler frequency

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Embodiment Construction

[0048] The direct positioning method based on the time delay of the external radiation source and the Doppler frequency of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods: as shown in the figure, in order to solve the above problems in this embodiment, it is necessary to first establish a The mathematical model of the direct wave signal and the echo signal reflected by the target. Based on this, the time domain data is converted into frequency domain data by calculating the Fourier coefficient of the received signal, and then the Gaussian maximum likelihood estimator is constructed for the received data converted to the frequency domain. , and then transform the problem of extracting the target location information from the data into the problem of solving the maximum eigenvalue of the information matrix, and finally obtain the target location estimate through geographic grid search. The spe...

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Abstract

The invention discloses a direct positioning method based on outer radiation source time delay and Doppler frequency, which overcomes the problem that the prior art does not fully utilize the information of a direct wave signal of an external radiation source. The direct positioning method comprises steps of performing time synchronization on double-channel reception systems of L observation stations, calculating the Fourier coefficient of the data received by the double channels of each observation station, transmitting the obtained array signal frequency domain data to a center station by the observation station, constructing a gauss maximum likelihood function for the data of the conversion value frequency domain and extracting the information matrix containing the echo time delay, the Doppler and the direct wave time delay information. The accurate positioning of the object can be obtained through setting a grid searching scope, calculating the maximum characteristic value corresponding to the data information array on the geography grid and searching the coordinate corresponding to the maximum value in the range of the grid. Compared with the traditional two-step positioning algorithm, the invention reduces the loss of the positioning information, and the positioning accuracy is dramatically improved.

Description

technical field [0001] The invention relates to a positioning method in an external radiation passive positioning scenario, in particular to a direct positioning method based on external radiation source time delay and Doppler frequency. Background technique [0002] Passive location of external radiation sources refers to the use of non-cooperative third-party radiation sources (such as AM / FM signals, ordinary / digital TV signals, etc.) Time delay, frequency and other related parameter information, and then realize the positioning and tracking of the target. The use of third-party non-cooperative illumination sources to detect targets can not only realize the detection, positioning and tracking of invisible targets and silent targets, but also can be used for imaging and recognition of targets. [0003] At present, the positioning system used for passive positioning of external radiation sources is the traditional passive positioning system, that is, a two-step positioning ...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 于宏毅吴瑛王云龙王鼎杨宾张莉唐涛吴江翟永惠
Owner THE PLA INFORMATION ENG UNIV
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