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

A technology of echo power and speed measurement, applied in radio wave measurement systems, measurement devices, reflection/re-radiation of radio waves, etc., can solve the problems of radar installation errors, large speed measurement errors, and inability to effectively overcome speed measurement errors, etc. Achieving stable and accurate speed

CN101738601BInactive Publication Date: 2012-06-20XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-06-20
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0044] The content and effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] refer to figure 2 , the locomotive speed measurement system includes a sampling rate selection module, a frequency spectrum center of gravity method estimation speed module, a speed correction module and an anti-antenna beam angle error module.

[0046]The sampling rate selection module is used to select the sampling rate to ensure that the relative error of the measured speed value meets the requirements of the locomotive speed measurement, and send the selected sampling rate data to the pre-estimated speed module of the spectral center of gravity method. The frequency resolution of the traditional fast Fourier transform operation is fixed, and the relationship between the speed resolution is determined by the frequency resolution. The speed measurement error obtained by the FFT operation is absolute, that is to say, the relative e...