Positioning method of optimal joint time synchronization and positioning under TDOA condition

A technology of time synchronization and positioning method, which is applied in the direction of synchronization device, service based on location information, electrical components, etc., and can solve the problem of low positioning accuracy

CN107613458AActive Publication Date: 2018-01-19XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-01-19

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Abstract

The invention proposes a positioning method of optimal joint time synchronization and positioning under a TDOA condition for solving the technical problem of low positioning accuracy in the existing mobile terminal positioning technology. The method comprises the following steps: setting system parameters; establishing an observation model of joint time synchronization and positioning arrival timedifference TDOA; establishing a double-constraint mobile terminal position estimation target function based on the observation model of joint time synchronization and positioning arrival time difference TDOA; and solving the double-constraint mobile terminal position estimation target function to obtain a globally optimal solution of a to-be-estimated vector y, and reading the globally optimal solution of a mobile terminal position vector p. By adoption of the positioning method, the transmission of positioning errors is avoided, the globally optimal solution of the positioning non-convex problem is obtained, the positioning accuracy is improved, and thus the positioning method can be applied to mobile terminal positioning estimation depending on a plurality of cellular base stations in asight distance scene.
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Description

technical field

[0001] The invention belongs to the technical field of wireless communication, and specifically relates to a positioning method for optimal joint time synchronization and positioning under TDOA conditions, which can be used to estimate the positioning of a mobile terminal by relying on multiple cellular base stations in a line-of-sight scenario. Background technique

[0002] At present, positioning technology plays a pivotal role in wireless communication, geological survey, intelligent transportation, emergency rescue, etc., and it is of practical significance to study accurate positioning methods. Positioning is divided into two categories: ranging-based positioning methods and non-ranging-based positioning methods. The positioning method based on ranging mainly uses TDOA ranging method, time-of-arrival ranging method, received signal strength ranging method, and angle-of-arrival ranging method to achieve ranging. The current ranging methods based on TDOA ...

Examples

Embodiment Construction

[0059] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0060] refer to figure 1 . The positioning method of optimal joint time synchronization and positioning under TDOA conditions, comprising the following steps:

[0061] Step 1) Set system parameters:

[0062] The number of cellular base stations participating in the positioning of the mobile terminal and whose location is known is m, the number of the mobile terminal is 1, and both the base station and the mobile terminal are located in the n-dimensional coordinate system; the mobile terminal sends signals to m base stations when the external clock is 0, and the selected coordinates The first base station at the zero point is used as the reference base station, and the clock phase offset relative to the external reference clock is τ 1 , the external reference clock receiving the mobile terminal signal is T 1 , the observation noise is...