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Direct locating 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: 2016-09-07
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 locating method based on external radiation source time delay and Doppler frequency
  • Direct locating method based on external radiation source time delay and Doppler frequency
  • Direct locating 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 locating method based on external radiation source time delay and Doppler frequency, and overcomes the problem of insufficient utilization of external radiation source direct wave signal information of the existing direct locating method. The direct locating method comprises the following steps that time synchronization of the dual-channel receiving systems of L observation stations is performed; the Fourier coefficient of the dual-channel receiving data of each station is calculated; each observation station transmits the acquired array signal frequency domain data to a central station; a Gaussian maximum likelihood function is constructed for the data of the conversion value frequency domain at the central station and an information matrix including echo time delay and Doppler and direct wave time delay information is extracted; a grid search scope is set and the maximum eigenvalue corresponding to the data information matrix on geographical grid points is calculated; and accurate locating of a target can be obtained by searching the coordinates corresponding to the maximum value within the grid scope. Compared with the conventional two-step locating algorithm, loss of locating information can be reduced and locating precision can be obviously enhanced.

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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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/06
CPCG01S7/41G01S13/06
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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