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A Fast Compression Method for Frequency-Shifted Signals of Vehicular Tracks Based on Compressive Sensing

A technology of compressive sensing and compression method, which is applied in the field of fast compression of vehicle track frequency-shifting signals based on compressive sensing, which can solve the problems of constant compression ratio, inability to adjust the compression ratio for efficient compression, and inability to effectively solve actual needs, etc., and achieve high compression efficiency. , reduce bandwidth requirements and transmission delay, and achieve good real-time performance

Inactive Publication Date: 2017-01-04
CHINA RAILWAYS CORPORATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The disadvantage of the above-mentioned orbital frequency-shift signal compression methods is that they can only compress the signal with a low compression ratio, and the compression ratio is constant, and cannot adaptively adjust the compression ratio according to the quality of the frequency-shift signal to achieve high-efficiency compression
With the continuous improvement of my country's railway operation speed, the track frequency shift signal has a greater impact on the storage load of on-board equipment, wireless transmission bandwidth and delay. The existing compression methods cannot effectively meet the actual needs.

Method used

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  • A Fast Compression Method for Frequency-Shifted Signals of Vehicular Tracks Based on Compressive Sensing
  • A Fast Compression Method for Frequency-Shifted Signals of Vehicular Tracks Based on Compressive Sensing
  • A Fast Compression Method for Frequency-Shifted Signals of Vehicular Tracks Based on Compressive Sensing

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Embodiment

[0044] According to the formula (1), generate orbital frequency shift signal x={x(i), i=1,2,...,N} T , where, amplitude A=1, carrier frequency f c = 1700Hz, low frequency f 0 = 12.5Hz, sampling rate f s =8000Hz, signal-to-noise ratio SNR=15dB, signal length N=2000, its time-domain waveform is as follows figure 1 shown.

[0045] The present invention includes two processes of compression and decompression, wherein the compression process (see image 3 ) The specific steps are:

[0046] (1.1) Calculate the sparsity K=||x|| of the orbital frequency shift signal x 0 = 1902;

[0047] (1.2) Since K does not satisfy K≤N / 100, perform FFT fast Fourier transform on x to obtain the frequency domain coefficient θ={θ(i),i=1,2,...,N} T =FFT(x), its waveform is as figure 2 Shown, and calculate the sparsity K=||θ|| 0 , set Flag=1;

[0048] (1.3) Select the observation dimension M to satisfy This embodiment takes c=1, M=200, and constructs an observation matrix with M rows and N c...

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Abstract

The invention discloses a vehicle-mounted rail frequency shift signal rapid compression method based on compressed sensing. The vehicle-mounted rail frequency shift signal rapid compression method is used for rapid compression of rail frequency shift signals in LKJs, DMSs and vehicle-mounted subjectivization cab signal systems on ordinary-speed trains and high-speed trains. The method includes the steps of firstly, calculating the sparsity of a vehicle-mounted rail frequency shift signal to be compressed, and determining whether to conduct sparsity conversion on the vehicle-mounted rail frequency shift signal to be compressed or not according to the sparsity; secondly, compressing a sparsity coefficient through a gauss random matrix to obtain compressed data; thirdly, effectively recovering the rail frequency shift signal just through a compressed sensing reconstruction method when uncompressing the compressed data. According to the method, the compression ratio of the rail frequency shift signal is high, the instantaneity is high, the storage loads of the vehicle-mounted LKJs, the vehicle-mounted DMSs and the vehicle-mounted cab signal systems can be effectively reduced, the bandwidth requirement of vehicle-ground wireless transmission of the vehicle-mounted rail frequency shift signal is lowered, the transmission time delay of vehicle-ground wireless transmission of the vehicle-mounted rail frequency shift signal is reduced, and the method has wide application prospects in high-speed rail vehicle-mounted signal real-time monitoring.

Description

technical field [0001] The present invention relates to a data processing method for monitoring information of on-board equipment of ordinary and high-speed trains, in particular to a method for fast compression of on-board track frequency shift signals based on compressed sensing, which can efficiently compress track frequency shift signals, thereby reducing the burden of on-board LKJ, DMS and on-board The storage load of the locomotive signal is beneficial to reduce the bandwidth requirement and transmission delay of the vehicle-ground wireless transmission of the vehicle frequency shift signal. Background technique [0002] The frequency-shifting track circuit is the basic link of modern railway signaling equipment and automatic blocking system. It sends track frequency-shifting signals along the track through a transmitter, and transmits blocking partition status information and train operation to the main locomotive signal system, LKJ and DMS and other on-board equipment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30
Inventor 王小敏黄成周杨扬郭进闫连山潘炜
Owner CHINA RAILWAYS CORPORATION
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