Filtering method for processing transponder uplink signal

A technology of transponder and filtering algorithm, applied in the direction of adaptive network, impedance network, electrical components, etc., can solve the problems of inability to obtain the message information of the transponder correctly, affecting the driving safety, ghost transponder, etc.

Active Publication Date: 2015-10-21
BEIJING JIAODA SIGNAL TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex electromagnetic environment for the installation and application of transponders and BTMs (transponder vehicle transmission modules, installed on trains to receive message information from ground transponders), the uplink signals received by BTMs often contain broadband The noise interference in the band cannot be effect

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  • Filtering method for processing transponder uplink signal
  • Filtering method for processing transponder uplink signal
  • Filtering method for processing transponder uplink signal

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Embodiment Construction

[0047]In order to improve the signal-to-noise ratio of the transponder's uplink signal, reduce broadband noise interference, and improve the performance of receiving BTM messages, the invention provides a filtering method for transponder uplink signal processing. After the BTM receives the uplink signal through the vehicle-mounted antenna, the digital uplink signal is obtained through a 4.234MHz bandpass filter, preamplifier, and ADC module, and then the present invention can be used to process the digital uplink signal , adaptively filter out the noise, improve the signal-to-noise ratio, and then send the denoised (removed noise signal) uplink signal to the BTM demodulation and decoding module for processing, such as Image 6 shown.

[0048] The on-board equipment of the transponder transmission system includes BTM and on-board antenna unit (referred to as on-board antenna). During the operation of the train, the on-board antenna continuously transmits radio frequency energy ...

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Abstract

The invention discloses a filtering method for processing transponder uplink signals. The filtering method distinguishes a ''point-passing'' moment and a ''non-point-passing'' moment through identifying characteristic frequency, acquires a noise signal at the ''non-point-passing'' moment to obtain filtering algorithm related parameters, and obtains a denoised uplink signal through the filtering algorithm at the ''point-passing'' moment and the filtering algorithm related parameters at the ''non-point-passing'' moment. The filtering method has the advantages of reducing interference of spatial stray electromagnetic waves, a traction motor and a passing neutral section on the transponder uplink signals, improving signal-to-noise ratio of the signals, reducing transmission bit error rate, improving vehicle-ground signal transmission reliability, and improving the train operation efficiency.

Description

technical field [0001] The invention relates to a point type transponder transmission system of a train operation control system in the field of railway communication signals, in particular to a filtering method for transponder uplink signal processing. Background technique [0002] The point balise transmission system is a high-speed point-to-vehicle data transmission device based on the principle of electromagnetic coupling. The ground balise installed in the rail provides information such as positioning, line parameters, and speed limit to the on-board equipment of the train control system. It is used in high-speed railway and urban rail traffic control system. After the on-board equipment receives the data transmitted by the transponder, it needs to perform filtering processing before demodulation and decoding to reduce the influence of space stray electromagnetic waves. Currently, a band-pass filter is generally used in filtering processing to filter out out-of-band no...

Claims

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Application Information

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IPC IPC(8): H03H21/00
Inventor 吕城锦赵会兵朱林富
Owner BEIJING JIAODA SIGNAL TECH
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