Subway construction signal anti-interference transmission device

Abstract

The invention discloses a subway construction signal anti-interference transmission device, and the device comprises a peak value real-time extraction circuit, an amplitude detection circuit, an interference signal judgment circuit and an interference signal suppression circuit; a charging voltage on a capacitor C1 is used for detecting a peak value of a subway construction signal mixed with a strong electromagnetic interference signal in real time; a purer subway construction signal is obtained by using the differential circuit 1, the amplitude of the purer subway construction signal is extracted by using the charging voltage on the capacitor C5, the difference between the peak value of the subway construction signal and the amplitude of the purer subway construction signal is obtained by using the differential circuit 2, and the larger one of the partial voltage values of the difference and the resistors R24-R25 is output; the strong pulse interference signal is suppressed by selecting an amplitude limiting or attenuation mode, existence of the strong pulse interference signal in the subway construction signal can be detected, and the strong pulse interference signal is suppressed by selecting the amplitude limiting or attenuation mode.

Description

technical field [0001] The invention relates to the technical field of subway construction, in particular to an anti-interference transmission device for subway construction signals. Background technique [0002] The subway construction signal is generated during the subway construction process and is used to reflect the construction information. The transmission of the subway construction signal is conducive to the construction manager to understand the real-time information of the subway construction in time, so as to correct the design in time and guide the construction; [0003] However, the subway construction period is long, and it is inevitable to encounter thunderstorms, and the lightning and lightning strikes generated by nature in thunderstorms have strong electromagnetic energy, which will bring great electromagnetic interference to the subway construction signals in transmission. Under such electromagnetic interference, the construction signal will appear a high-...

AI Technical Summary

Problems solved by technology

[0003] However, the subway construction period is long, and it is inevitable to encounter thunderstorms, and the lightning and lightning strikes generated by nature in thunderstorms have strong electromagnetic energy, which will bring great electromagnetic interference to the subway construction signals in transmission. Under such electromagnetic interference, the construction signal will appear a high-intensity electromagnetic interference signal; after the subway construction signal is transmitted to the corresponding subway construction signal receiver, the subway construction signal receiver often needs to pass through the received subway construction signal first. The preamplifier is amplified, so at the same time, the electromagnetic interference signal that appears in the subway construction signal will also be amplified by the preamplifier. Level subway construction signal demodulators, decoders and other equipment are damaged, which will have a negative impact on the safety of the subway construction signal transmission system.

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