A vehicle speed measurement method and system based on passive passive technology on both sides of the road

Abstract

The invention discloses a vehicle speed measurement method and system based on passive technology on both sides of the road. When a vehicle enters and leaves a speed measurement area, the shielding of two wireless communication links at the entrance boundary and the exit boundary leads to a change in the received signal strength value RSS. According to the estimated speed of the vehicle, the length of the sliding window is dynamically selected, and the RSS variance of the wireless communication link at the vehicle entrance boundary and the wireless communication link at the exit boundary are calculated respectively. The length of the known speed measurement area is used to calculate the vehicle speed; the wireless communication link RSS signal collected by the monitoring node in the speed measurement area can be applied to vehicle speed measurement in multiple fields, and multi-channel scanning is used to collect signals between monitoring nodes at the same time, even if a certain channel generates Larger disturbances can still measure the vehicle speed, which helps to improve the accuracy of vehicle speed measurement.

Description

technical field [0001] The invention belongs to the field of vehicle speed measurement, in particular to a vehicle speed measurement method and system based on passive technology on both sides of a road. Background technique [0002] Radio Tomographic Imaging (RTI, Radio Tomographic Imaging) is a passive positioning technology based on wireless sensor networks. positioning and tracking. Compared with the traditional active positioning system, the passive positioning technology only needs to deploy several wireless sensor nodes around the monitoring area to form a communication network, without the need for the target to carry any electronic tags to complete the positioning and tracking of the target. [0003] Currently, vehicle speed measurement is widely used in road traffic and national defense land battlefields and other fields. Common vehicle speed measurement methods include video speed measurement, induction coil speed measurement, radar speed measurement, ultrasonic...

AI Technical Summary

Problems solved by technology

Although laser speed measurement is theoretically feasible, there are safety problems in the process of use

Radar speed measurement is easily affected by environmental weather

Other wireless sensor speed measurement is mostly based on active positioning technology, which requires the vehicle itself to carry an electronic tag, which is difficult to be popularized and applied in practice

[0004] The current vehicle speed measurement technology based on radar, laser and machine vision is not only costly, but also vulnerable to environmental weather and cannot work around the clock, nor can it measure the speed of the target through obstacles

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