Fused speed measurement processing method and device based on accelerometers

Abstract

The embodiment of the invention discloses a fused speed measurement processing method and device based on accelerometers. The method comprises the following steps: enabling three accelerometers to bearranged in three different angles, and according to the angles of the three accelerometers, calculating an accelerated speed of a current train; measuring a speed of the train at a current moment through a speed sensor; and performing fusion calculation on the accelerated speed and the speed to obtain a target speed of the current train. Through adopting a speed measurement judging mode based onthe accelerometers, the method disclosed by the invention fuses speed measurement processing of the speed sensor and the accelerometers; the interference of an external environment to the precision ofa speed measurement system does not need to be taken into account; the speed measurement precision and usability of signal equipment are improved; and unnecessary loss is avoided.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of rail transit, and in particular to an accelerometer-based fusion speed measurement processing method and device. Background technique [0002] With the rapid development of urban rail transit, the probability of open-air lines is gradually increasing. In open-air conditions, it is greatly affected by weather and the environment. Since the radar is installed outside the car body and directly contacts the external environment, the speed measurement accuracy is greatly affected. In bad weather, speed measurement is prone to speed measurement deviation, which leads to system speed measurement failure. [0003] The speed measurement equipment included in the existing vehicle-mounted ATP subsystem includes: 2 speed sensor devices and 3 accelerometer devices. At present, due to the influence of weather and environmental factors on the ground, the radar speed measurement accuracy is greatly ...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of urban rail transit, the probability of open-air lines is gradually increasing. In open-air conditions, it is greatly affected by weather and the environment. Since the radar is installed outside the car body and directly contacts the external environment, the speed measurement accuracy is greatly affected. In bad weather, speed measurement is prone to speed measurement deviation, which leads to system speed measurement failure

[0003] The speed measurement equipment included in the existing vehicle-mounted ATP subsystem includes: 2 speed sensor devices and 3 accelerometer devices. At present, due to the influence of weather and environmental factors on the ground, the radar speed measurement accuracy is greatly affected by the environment, and it is easy to misjudge the speed measurement failure. , affecting system availability

With more and more subway lines, the complexity of line station types is gradually increasing. When there are many open-air lines in a station type of a line, and the weather conditions are bad (rain and snow), in this part of the open-air In the line scene, it will affect the environment of the radar wave reflection surface, and then affect the weakening of the reflected signal strength, resulting in a serious decrease in the speed measurement accuracy of the radar equipment, and finally invalidating the speed measurement.

At present, radar equipment has no protective measures against environmental interference. The invalid speed measurement caused by the decrease of radar speed measurement accuracy has a greater impact on driving safety and increases operational risks.

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