System and method for measuring speed of locomotive based on radar near field echo power spectrum characteristics

Abstract

The invention discloses a system and a method for measuring the speed of a locomotive based on radar near field echo power spectrum characteristics, which mainly solve the problems that the prior art has big errors and is unstable in measuring the speed of the locomotive. The measuring system comprises a sampling rate selecting module, a frequency spectrum gravity center method speed predicting module, a speed correcting module and an antenna beam angle error resisting module. The sampling rate selecting module selects a sampling rate corresponding to the current speed to ensure that the relative errors for measuring the speed in the subsequent modules can meet the requirements on the speed measurement accuracy; and the frequency spectrum gravity center method speed predicting module predicts the speed of the locomotive, and the predicted speed of the locomotive is corrected for the first time and the second time by the speed correcting module and the antenna beam angle error resisting module respectively to obtain a final estimation result of the speed of the locomotive. The system and the method has the advantages of small computation quantity, good stability and high speed measurement accuracy, and can be used for performing accurate measurement on the speed of the locomotive by using a locomotive speed measurement Doppler radar.

Description

technical field [0001] The invention belongs to the technical field of radar near-field measurement, and specifically relates to a locomotive speed measurement method, which is used in complex locomotive electromagnetic environments, different railway subgrade environments, wide radar antenna beams, and errors in antenna beam directions. Under this condition, the measurement of the speed of the locomotive can be realized stably and accurately. Background technique [0002] At present, in my country's railway system, the measurement of locomotive speed mainly relies on photoelectric sensors. This photoelectric speed measuring device obtains the speed value of the locomotive by measuring the number of revolutions of the locomotive wheels or a rigid shaft. The principle of the photoelectric sensor is simple and easy to implement, but this method of speed measurement will have a certain system deviation when the wheel slips, idling, and the diameter of the wheel changes due to w...

AI Technical Summary

Problems solved by technology

However, due to the difficulty of accurately estimating the intersection point K, although the speed measurement accuracy of the DRS05 radar has improved, the speed measurement error is still relatively large

[0005] Although theoretically the Doppler speed measuring radar can overcome the shortcomings of the traditional method, is stable and reliable, and can provide accurate measurement accuracy, but in fact, due to factors such as the electromagnetic environment of the locomotive, the geographical environment, the beam width of the radar antenna, and the error of the installation angle of the radar antenna, etc. The accuracy of the locomotive speed measured by the Doppler locomotive speed measuring radar is not high and is easily affected by the installation error of the radar itself. At the same time, it cannot effectively overcome the speed measurement error caused by different roadbed environments

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