A joint search method and device for direct positioning
A joint search and direct technology, applied in positioning, measuring devices, instruments, etc., can solve problems such as inaccurate direct positioning results, achieve real-time search, improve positioning efficiency, and improve accuracy
Active Publication Date: 2022-05-10
PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU
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[0004] The purpose of the present invention is to provide a joint search method and device for direct positioning, which is used to solve the problem of inaccurate direct positioning results in the prior art
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[0039] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0040] The present invention provides a joint search method for direct positioning, comprising the following steps:
[0041] 1) Construct the target radiation source data model including time delay parameters of each observation station, collect the received data of each observation station, construct a cost function according to the time delay parameter, the data model of the target radiation source and the received data of each observation station, and the cost function The position corresponding to the minimum value of is the position of the target radiation source;
[0042] 2) Select the received data of at least two observation stations to obtain the estimated position of the target radiation source, and take the estimated position of the target radiation source as the center to determine the search range of the target radiation source;
[0...
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The present invention provides a joint search method and device for direct positioning, constructs a target radiation source data model including time delay parameters for each observation station, collects the received data of each observation station, and constructs a cost function according to the data model and received data, The position corresponding to the minimum value of the cost function is the position of the target radiation source; select the received data of at least two observation stations to obtain the estimated position of the target radiation source, and determine the search range of the target radiation source with the estimated position of the target radiation source as the center; The minimum value of the cost function is obtained by performing a multi-level grid search with a set number of stages within the search range, and the position corresponding to the minimum value is the position of the target radiation source. Compared with the traditional grid search algorithm, the present invention greatly reduces the search time, satisfies the requirement of real-time search, improves the positioning efficiency of the target radiation source, accurately locates the target radiation source, and improves the precision of the direct positioning result.
Description
technical field [0001] The invention belongs to the technical field of passive positioning, in particular to a joint search method and device for direct positioning. Background technique [0002] Direct positioning is an important method in passive positioning. Compared with the traditional two-step positioning method, this method does not need to pre-estimate DOA, TDOA and other parameters, and directly uses the original array data to calculate the position of the target by means of maximum likelihood. Non-linear estimation reduces the loss of target information in the process of parameter estimation, and has higher positioning accuracy under low signal-to-noise ratio. However, in practical applications, since the direct positioning method does not have a closed-form solution, the positioning solution is a typical nonlinear optimization problem. It is necessary to search for the optimal value of the cost function in the monitoring area, and the calculation requires a large ...
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IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 吴迪李春奇訾琳溁胡涛赵拥军蒋腾
Owner PLA STRATEGIC SUPPORT FORCE INFORMATION ENG UNIV PLA SSF IEU