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ZPW-2000 orbit shift signal decoding method based on Duffing oscillators

A ZPW-2000, signal decoding technology, applied in the direction of using block codes for error correction/detection, data representation error detection/correction, etc., can solve problems such as failure of decoding methods, spectral line interference, and inability to decode correctly. Achieve the effects of easy hardware, avoiding spectrum interference, and easy calculation

Inactive Publication Date: 2011-08-03
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

Its disadvantage is that they can only decode orbital frequency-shifted signals with high SNR, and cannot decode correctly in the case of strong background noise and low SNR
In addition to receiving the frequency shift signal of the main track circuit, the receiver also receives the frequency shift signal of the small track circuit in the adjacent section at the same time, forming spectral line interference. In the case of low signal-to-noise ratio, the above decoding method will also fail

Method used

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  • ZPW-2000 orbit shift signal decoding method based on Duffing oscillators
  • ZPW-2000 orbit shift signal decoding method based on Duffing oscillators
  • ZPW-2000 orbit shift signal decoding method based on Duffing oscillators

Examples

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Embodiment 1

[0051] The first specific embodiment of the present invention is, a kind of ZPW-2000 track frequency shifting signal decoding method based on Duffing oscillator, its steps are:

[0052] A. The structure of the Duffing oscillator

[0053] Select the Duffing oscillator equation with the following characteristics:

[0054] 1 ( 2 πf ) 2 x · · ( t ) + k 2 πf x · ( t ) - x 3 ( t ) + x 5 ( t ) = r cos ( 2 πf...

Embodiment 2

[0069] The operation of this example is basically the same as that of Example 1, except that the selected Duffing oscillator equation is changed to:

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Abstract

The invention discloses a ZPW-2000 orbit shift signal decoding method based on Duffing oscillators, which comprises the steps of: firstly, attenuating an acquired ZPW-2000 orbit shift signal and then adding to a carrier coding 4-oscillator array consisting of 4 Duffing oscillators; decoding according to state change of the oscillators to obtain a carrier frequency, then carrying out spectrum shift on the orbit shit signal by using the carrier frequency and then carrying out bandpass filtering; and finally, adding a filtered signal to a low-frequency coding 18-oscillator array consisting of 18Duffing oscillators, and decoding according to state change of the oscillators to obtain a low frequency. The method disclosed by the invention has the advantages of strong reliability and easiness in hardware realization, can be used for accurately and reliably decoding ZPW-2000 and UM-71 orbit shift signals with low signal to noise ratio, provides a feasible scheme for the detection of the orbit shift signals under a high-noise environment, and has larger application value in high-speed railways and passenger special lines.

Description

technical field [0001] The invention relates to a ZPW-2000 orbital frequency shift signal decoding method. Background technique [0002] The non-insulated frequency-shifting track circuit is the basic link of modern railway signaling equipment and automatic blocking system. It sends frequency-shifting signals along the track through the transmitter, and transmits blocking partition status information and train operation control information to the receiver and locomotive signaling equipment. Its main function is It is to ensure the safety of trains and improve the capacity of trains. [0003] At present, the ZPW-2000 track frequency shift signal has become the main signal system in my country's speed-up railways, intercity railways, passenger dedicated lines and high-speed railway automatic blocking systems, and is also the basic ground signal for locomotive signals and train overspeed protection (ATP). The frequency-shifted signal has the same modulation method and modulati...

Claims

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Application Information

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IPC IPC(8): H03M13/05
Inventor 王小敏贺莉张文芳郭进
Owner SOUTHWEST JIAOTONG UNIV
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