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Self-closed-loop time synchronization method of indoor pseudo-satellites

A technology of time synchronization and pseudolite, applied in time division multiplexing systems, radio-controlled timers, radio transmission systems, etc., can solve problems such as inability to penetrate the walls of buildings, loss of positioning functions of satellite navigation receivers, etc. Achieve time synchronization to achieve simple and stable pseudo-range measurement value

Inactive Publication Date: 2015-09-23
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

However, due to the occlusion effect of buildings, satellite navigation signals cannot penetrate the walls of buildings, so that the satellite navigation receiver loses its positioning function

Method used

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  • Self-closed-loop time synchronization method of indoor pseudo-satellites
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  • Self-closed-loop time synchronization method of indoor pseudo-satellites

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Embodiment Construction

[0032] Below in conjunction with specific embodiment and accompanying drawing, the present invention will be further described:

[0033] An indoor pseudolite self-closed loop time synchronization method, comprising the following steps:

[0034] ① Deploy two pseudolites indoors and transmit navigation signals respectively to build a zero-baseline self-closed-loop indoor pseudolite measurement architecture; among them, the pseudolite measurement architecture includes indoor master pseudolites and indoor slave pseudolites, and indoor master-slave pseudolites are composed of Composed of pseudolite signal generator and self-closed loop synchronous receiver;

[0035] ② The self-closed-loop synchronous receiver of the indoor slave pseudolite simultaneously receives the indoor navigation signal of the slave pseudolite and the indoor main pseudolite, and calculates the indoor main pseudolite and Indoor time offset between pseudolites; figure 2 It is a schematic diagram of calculatin...

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Abstract

The invention discloses a self-closed-loop time synchronization method of indoor pseudo-satellites, and relates to the field of indoor and tunnel positioning. The method comprises that 1) an indoor pseudo-satellite measurement configuration of zero base line self-closed-loop is constructed, the pseudo-satellite measurement configuration includes a main indoor pseudo-satellite and a slavery indoor pseudo-satellite, and each of the main and slavery indoor pseudo-satellites comprises a satellite signal generator and a self-closed-loop synchronization receiver; 2) the self-closed-loop synchronization receivers of the main and slavery pseudo-satellites receive navigation signals of the main and slavery indoor pseudo-satellites simultaneously, and the clock difference between the main and slavery indoor pseudo-satellites is calculated; 3) the clock difference between the pseudo-satellites is processed to obtain a rough clock different control word and a fine clock different parameter, and the rough clock difference word is sent to the signal generators to realize rough synchronization of the pseudo-satellites; and the fine clock different parameter is written into a pseudo-satellite text to realize fine synchronization of the pseudo-satellites. Thus, the method can realize high-precision time synchronization between the indoor pseudo-satellites, and is low in cost, simple and practical.

Description

technical field [0001] The invention relates to the field of indoor and tunnel positioning, in particular to an indoor pseudolite self-closed-loop time synchronization method. Background technique [0002] At present, the demand for indoor positioning is becoming more and more urgent. People hope to know their own location in large shopping malls, public places, and long high-speed tunnels. [0003] Satellite navigation systems represented by Beidou and GPS are more and more widely used, and have become an indispensable function for smartphones and car navigators. However, due to the occlusion effect of buildings, the satellite navigation signal cannot penetrate the walls of buildings, so that the satellite navigation receiver loses its positioning function. [0004] Based on the above reasons, there is a need for a pseudolite device compatible with Beidou and GPS navigation signals, which can realize indoor positioning under the condition that the software and hardware mod...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04B7/185G04R20/02
Inventor 甘兴利蔚保国王珏
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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