Moving target direct positioning method based on quasi-newton method

A technology of moving targets and positioning methods, applied in positioning, measuring devices, instruments, etc., can solve problems such as huge amount of calculation

Active Publication Date: 2019-07-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The existing direct positioning technology mostly adopts the method based on grid search, which has a huge amount of calculation

Method used

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  • Moving target direct positioning method based on quasi-newton method
  • Moving target direct positioning method based on quasi-newton method
  • Moving target direct positioning method based on quasi-newton method

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Embodiment

[0087] Since the entire motion track of the target can be directly determined by its initial position and velocity, the estimation accuracy of its initial position and velocity determines the estimation accuracy of the target motion track. Here the estimation performance of the unknowns is compared between a grid search based direct localization method and a quasi-Newton based direct localization method.

[0088] Suppose the initial position vector of the target radiation source is p 0 =[4000,4000] T , the velocity vector is v=[200,20], the signal radiated by the target is a burst signal, and its carrier frequency is 1GHz. There are currently three static observation stations that can intercept its model, and conduct a time slot on the signal every second segment sampling (a total of 10 time slots), the position of the observation station and the movement track of the target are as follows: figure 1 shown.

[0089] figure 2 with image 3 It is the simulation result of th...

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Abstract

The invention belongs to the technical field of direct positioning in passive positioning, and relates to a moving target direct positioning method based on a quasi-newton method. According to the moving target direct positioning method based on the quasi-newton method, net points of searching target possible positions are simplified by mainly using the quasi-newton method; and a gradient is solved through an objective function, then iteration is carried out on an unknown quantity by using the quasi-newton method, the searching process is simplified, and rapid positioning is realized.

Description

technical field [0001] The invention belongs to the technical field of direct positioning in the passive positioning technology, and relates to a method for direct positioning of a moving target based on a quasi-Newton method. Background technique [0002] Passive positioning is a way to track and locate targets using existing radio frequency signals. Passive positioning is generally divided into passive positioning based on self-radiation and passive positioning based on external radiation sources. The former locates by receiving the signal radiated by the target itself, and the latter irradiates the target through a non-cooperative external radiation source and receives the target. echo signal to locate the target. The direct positioning technology in passive positioning does not require intermediate parameter estimation, directly uses the signal data domain information to locate the target, can effectively use the correlation between the observation stations, and improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/04
CPCG01S5/04Y02D30/70
Inventor 薛文丽张花国范曦丹高岚廖红舒
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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