Combined positioning method for moving multi-station passive time difference and frequency difference

A time difference and frequency difference, joint positioning technology, applied in radio wave measurement systems, using re-radiation, measurement devices, etc., can solve problems such as reducing the amount of calculation and positioning accuracy, achieving high-precision estimation, accelerating convergence speed, and avoiding calculation. large amount of effect

Active Publication Date: 2017-12-29
HARBIN ENG UNIV
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Problems solved by technology

This method can effectively reduce the amount of calculation, but in the process of data processing, the measurement error must obey the Gaussian distribution, otherwise the positioning accuracy will drop significantly

Method used

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  • Combined positioning method for moving multi-station passive time difference and frequency difference
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  • Combined positioning method for moving multi-station passive time difference and frequency difference

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Embodiment

[0114] figure 2 It is a comparison diagram of the root mean square error of the position and speed of the method of the present invention, the particle swarm optimization algorithm and the standard particle swarm optimization algorithm, where the time error obeys the Gaussian distribution. It can be seen from the figure that with the increase of the measurement error, the positioning accuracy of this method is higher, and it can achieve higher positioning accuracy without the estimation of the initial position of the target, and can avoid falling into the local optimum and approach the global optimum with a faster convergence speed. Excellent solution.

[0115] image 3 It is a comparison diagram of position and velocity deviation between the method of the present invention and the particle swarm optimization algorithm and the standard particle swarm optimization algorithm, wherein the time error obeys Gaussian distribution. It can be seen from the figure that this method s...

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Abstract

The invention discloses a combined positioning method for moving multi-station passive time difference and frequency difference, wherein the method belongs to the field of passive positioning technology. The method comprises the following steps of establishing a time different positioning model; establishing a frequency different positioning model; constructing a time difference and frequency difference observation matrix epsilicon1, and designing a fitness function; initiating a group and various parameters; evaluating the fitness function value of each particle; sequencing all particles; when the algorithm satisfies a terminating condition, outputting a current global optimal value; reconstructing the time difference and frequency difference matrix epsilicon2; obtaining a weighted least square solution theta2 and a covariance matrix cov(theta2); and calculating position and speed of a radiation source. The combined positioning method has advantages of performing optimal value solving on the fitness function which is obtained from the time difference and frequency difference observation matrix, combining a particle swarm optimization algorithm with a least square algorithm, and realizing high-precision target position on the condition of four base stations, and furthermore calculating speed information of the target. The combined positioning method can realize high-precision estimation to the position of the radiation source and is not limited by a station site layout. Furthermore relatively high positioning estimation precision is realized.

Description

technical field [0001] The invention belongs to the technical field of passive positioning, and in particular relates to a joint positioning method of moving multi-station passive time difference and frequency difference. Background technique [0002] Passive positioning technology has important application prospects in the field of electronic countermeasures, and has attracted extensive attention in various fields such as navigation, aerospace, military reconnaissance, and global satellite navigation. Passive positioning technology has the characteristics of high positioning accuracy, long range, and strong battlefield survivability, and can quickly realize accurate positioning and trajectory tracking of targets. In recent years, time difference and frequency difference joint positioning technology has been developed and improved rapidly. Compared with other positioning systems, it is more suitable for multi-base station cooperative positioning system to complete the precis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/02
CPCG01S11/02
Inventor 蒋伊琳刘梦楠陈涛郜丽鹏屈天开
Owner HARBIN ENG UNIV
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