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Multi-machine cooperative positioning precision optimization method and system

A technology of collaborative positioning and optimization method, which is applied in positioning, radio wave measurement system, measuring device, etc., can solve the problems of pseudo-code synchronization error system time delay error, low positioning accuracy, and different algorithms, etc., and achieve multiple distances and phases The effect of dimension optimization

Active Publication Date: 2021-02-05
中国人民解放军海军航空大学青岛校区
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Problems solved by technology

Limited by the number of antenna arrays of airborne stations, this method has the problem of low positioning accuracy
The factors that affect the positioning accuracy mainly exist in the distance measurement and phase calculation of the target position. Among them, the main factors that lead to ranging errors are pseudo-code synchronization errors, errors caused by multipath, errors caused by the troposphere, and system time. delay error, while the direction finding accuracy is relatively large due to the influence of the propagation environment and antenna spacing, as well as the use of different algorithms

Method used

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  • Multi-machine cooperative positioning precision optimization method and system
  • Multi-machine cooperative positioning precision optimization method and system
  • Multi-machine cooperative positioning precision optimization method and system

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with drawings and embodiments.

[0028] The multi-machine cooperative positioning accuracy optimization method provided by the present invention includes the following steps.

[0029] Step S1: Set up multiple airborne nodes, use the airborne nodes to generate a TDOA matrix, and obtain the positioning hyperbolic equation based on the matrix, and then solve it to obtain the coordinate value of the target position.

[0030] Specifically, this embodiment provides four airborne nodes, including one airborne central node and three airborne common nodes. to combine figure 1 , all helicopter nodes in the network can independently complete ranging and direction finding, and at the same time, central node a and ordinary node b can switch to each other according to the central node election strategy. The central node in the network is mainly responsible for the timing function of ordinary nodes and search and r...

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Abstract

The invention provides a multi-machine cooperative positioning precision optimization method and system. The method comprises the steps: setting a plurality of airborne nodes, generating a TDOA matrixthrough employing the nodes, obtaining a positioning hyperbolic equation according to the matrix, solving the positioning hyperbolic equation, and obtaining a target position coordinate value; carrying out system carrier-to-noise ratio valuing to obtain a pseudo code synchronization error in the ranging system, setting a time delay fluctuation level of a device in a working bandwidth, obtaining asystem time delay error, and calculating the ranging error of the system according to the pseudo code synchronization error and the system time delay error. By using a phase-locked loop module and adopting a phase-locked mode combining coarse search and precise search, achieving phase locking and calculating a phase error; and estimating a target position range according to the target position coordinate value, the system ranging error and the phase error. In this way, the positioning precision is optimized from multiple dimensions of distance and phase.

Description

technical field [0001] The invention belongs to the technical field of dynamic positioning, and in particular relates to a method and system for multi-machine cooperative positioning precision optimization. Background technique [0002] With the transformation of our naval strategy from offshore defense to open sea defense, maritime activities are becoming more and more frequent, and maritime emergencies are frequent, and maritime aviation search and rescue is becoming more and more important. At present, ultrashort wave interferometric direction finding and pseudo code ranging technology are widely used in sea target search and distress positioning. Limited by the number of antenna arrays of airborne stations, this method has the problem of low positioning accuracy. The factors that affect the positioning accuracy mainly exist in the distance measurement and phase calculation of the target position. Among them, the main factors that lead to ranging errors are pseudo-code s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 杨航李洪烈郭维波王倩李亭程春华
Owner 中国人民解放军海军航空大学青岛校区
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