A method and system for Bluetooth ranging

Abstract

The invention relates to the field of bluetooth communication, particularly to a method and system for distance measurement by bluetooth. Signal strength values of a bluetooth device B are collected through a bluetooth device A, a distance is obtained according to the signal strength values and a model of the distance between the bluetooth device A and the bluetooth device B, and the sum of the obtained distance and the step length is the actual distance, so that the distance measurement between the bluetooth devices is realized. According to the technical scheme, the Bluetooth device A is used for sampling the signal strength values of the bluetooth device B within a preset time, and the greatest signal strength value in the sampled signal strength values is selected as the optimal signal strength value. Because environmental interference is unpredictable, the interference can be stronger within one period, and no interference exists within one period basically, so that the signal fluctuation caused by the environmental interference can be eliminated; by adopting the technical scheme, the fluctuation of the signal values caused by various interference is corrected through the step length, so that the distance measurement is more accurate.

Description

technical field [0001] The invention relates to the field of bluetooth communication, in particular to a method and system for bluetooth distance measurement. Background technique [0002] Existing ranging technologies include ultrasonic ranging, laser ranging or GPS. Usually these distance measurement methods require relatively harsh environmental requirements. Ultrasonic and laser distance measurement have strong directivity, and both require special equipment to realize, and there cannot be any other objects between them and the measured object. GPS can only For outdoor applications. [0003] Among the current indoor ranging solutions, wifi ranging is one of them. However, although wifi can achieve indoor ranging, it is susceptible to interference or cross-frequency. The signal stability is not good, the sampling speed of the signal is also very slow, and it cannot be self-powered, and there are also problems with data security. [0004] The disadvantages of existing ...

AI Technical Summary

Problems solved by technology

[0005] 1. Ultrasonic and laser ranging require special equipment to achieve, which is quite cumbersome to implement, and the signal directivity is too strong, so it can only measure distance in a certain direction

[0006] 2. The stability of the wifi ranging signal is not good, and it cannot be self-powered, which leads to certain limitations in deployment

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