Filtering method for processing transponder uplink signal

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...

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 effectively removed by the existing band-pass filter, resulting in the degradation of BTM reception performance, "lost points", "all 0 messages", "ghost transponder" and other phenomena, which make the train control of the subsequent stage The on-board core equipment cannot correctly obtain the transponder message information, which affects driving safety

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