Method of ranging and positioning based on optical synchronization signal and devices thereof

Abstract

The MBS transmits the CS and SYNi. MS receives the CS and transmits S. The MBS receives the positioning signal S and records the arrival time information. The SBSi receives SYNi and S, and records the arrival time of the two signals. Based on the aforesaid time information and the distance between the MBS and the SBSi, the distances from the MS to MBS and the SBSi are calculated. The present invention uses optical signal as synchronizing signal, the receiver of which costs less as compared to UWB signal; compared with sound signals, the optical signal has shorter wave and higher frequency and steeper rising edge after being modulated by pulses as ; compared with other narrow-band radio-frequency signal, the optical signal has shorter wave and is less sensitive to impacts resulted from multipath when multiple paths of signals overlay and requires no complex phase demodulation.

Description

technical field [0001] The present disclosure relates to wireless communications, and more particularly, the present disclosure relates to the fields of ranging and positioning. Background technique [0002] Short-range, high-precision wireless indoor positioning technology is widely used in dense urban areas and indoor closed spaces. Commonly used positioning algorithms in existing indoor positioning technologies include Time of Arrival (TOA) positioning and Time Difference of Arrival (TDOA) positioning. In the implementation process of the above algorithm, precise time synchronization between each positioning base station and mobile terminal is required to achieve high positioning accuracy. In the prior art, there are mainly two commonly used synchronization methods between positioning base stations. One is that each positioning base station contains an accurate synchronization clock, such as an atomic clock. This method is expensive and needs to be regularly checked. Cl...

AI Technical Summary

Problems solved by technology

The narrowband radio frequency signals include: FM continuous wave, FM pulse, etc. When such signals are used as synchronous signals, when there is multipath, multiple radio frequency signals will be superimposed at the receiving end, and phase demodulation is required to convert the multi-channel signals In order to achieve synchronization, the phase demodulation algorithm and receiver structure are relatively complex, the demodulation effect is unstable, and the cost of the receiver is relatively high

When the ultra-wideband radio frequency signal is used as the synchronization signal, it has a better synchronization effect because of its high time domain resolution, but the receiver needs to filter the ultra-wideband signal, ultra-wideband amplification, and high sampling rate analog-to-digital conversion Waiting for processing can accurately detect the time domain edge, which makes the cost of the receiver rise sharply

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