Frequency shift parameter measuring system of frequency shift track circuit and measuring method thereof
A technology of parameter measurement and track circuit, which is applied in the field of signal measurement, can solve problems such as complex algorithms, low measurement accuracy, and poor real-time performance, and achieve the effects of reducing the amount of calculation, improving measurement accuracy, and reducing hardware costs
Inactive Publication Date: 2010-05-05
XIAN UNIV OF TECH
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[0003] The purpose of the present invention is to provide a frequency-shifting parameter measurement system for a frequency-shifting track circuit, which solves the problems of low measurement accuracy, poor real-time performance and complex algorithms in the existing frequency-shifting parameter measurement system
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[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] Non-insulated frequency-shifting track signals such as figure 2 As shown, the frequency-shifted signal consists of frequency f 上 and lower side frequency f 下 The signal at low frequency f 低 appear alternately, the carrier frequency f 载频 for
[0039]
[0040] The frequency offset Δf is
[0041]
[0042] The structure of the frequency shift parameter measurement system of the frequency shift track circuit of the present invention is as figure 1 As shown, it includes a signal conditioning circuit 1, a true effective value measurement circuit 2, an analog-to-digital conversion module 3 and a data processing module 4 connected in sequence, the data processing module 4 is also connected to the signal conditioning circuit 1, and the data processing module 4 is also connected to There is a zero-crossing detection circuit 5 and a p...
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The invention discloses a frequency shift parameter measuring system of a frequency shift track circuit, comprising a signal conditioning circuit, a true RMS measuring circuit, an analog digital conversion module and a data processing module which are successively connected, wherein the data processing module is connected with the signal conditioning circuit and is also connected with a zero-crossing detection circuit and a power management module; the zero-crossing detection circuit is connected with the signal conditioning circuit, and the power management module is respectively connected with the analog digital conversion module, the signal conditioning circuit, the true RMS measuring circuit and the zero-crossing detection circuit. When the system is adopted to measure, a completely continuous multi-cycle synchronous frequency measuring method is combined with statistics to measure the frequency and frequency deviation of carrier frequency; low frequency is measured by combining a multi-cycle continuous counting method with a table lookup method, so that the invention has high measurement precision and small algorithm complexity and gives consideration to measurement precision and instantaneity. Meanwhile, singlechip or CPLD or FPGA can be adopted to realize, which lowers system hardware cost.
Description
technical field [0001] The invention belongs to the technical field of signal measurement, and relates to a railway signal measurement system, in particular to a frequency-shift parameter measurement system for a frequency-shift track circuit, and also relates to a measurement method using the above-mentioned system. Background technique [0002] In the railway system, the operation of the train is mainly regulated by the frequency shift blocking system to ensure the safety of the train. At present, the measurement of frequency-shifted signals is mainly done by software based on the Fast Fourier Transformation (FFT) algorithm. The complexity of the software algorithm in this method is determined by the resolution of the frequency. To improve the measurement accuracy of the frequency, It is necessary to increase the calculation points of the FFT algorithm. For the frequency measurement that requires high precision, it is bound to require more points in the FFT algorithm, resu...
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IPC IPC(8): G01R23/02G01R23/10
Inventor 杨媛高勇刘艳宏徐杰吴江樊永波谌冬
Owner XIAN UNIV OF TECH