Subway construction signal anti-interference transmission device

Abstract

The invention discloses a subway construction signal anti-interference transmission device, which comprises a timing power detection front circuit, a timing power detection rear circuit, a frequency switching control circuit and an adjacent channel interference resistance circuit, and is characterized in that the timing power detection front circuit uses the charging voltage of a capacitor C1 anda capacitor C2 to set timing time and an analog multiplier A1 is used for carrying out power detection on a subway construction total signal within the timing time; the timing power detection rear circuit uses the charging voltage of a capacitor C3 and a capacitor C4 to set the timing time and an analog multiplier A2 is used for carrying out power detection on a subway construction total signal 2within the timing time; the frequency switching control circuit divides the power value of the subway construction total signal 2 by the power value of the subway construction total signal; a divisionoperation result is compared with a standard signal-to-noise ratio related value through an operational amplifier AR6; the adjacent channel interference resistance circuit forms a frequency selectionloop through a resistor and a capacitor, an adjacent channel interference signal is absorbed to the ground, and the signal-to-noise ratio of the receiving circuit and the sensitivity of the wirelessreceiver are improved.

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 has become an indispensable means of transportation for people. Every city is vigorously building the subway. However, the construction environment of the subway is underground. Due to the uncertainty of the mechanical parameters of the ground and the unpredictability of the construction process, the underground engineering design and construction It is inevitable that there will be situations that do not conform to the actual stratum conditions. Therefore, it is necessary to monitor the construction information of the subway during the construction process and upload it to the monitoring technicians so that they can process, analyze and feed back to the construction and design in time, and then through the feedback of the monitoring information. Revise t...

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Problems solved by technology

[0002] The subway has become an indispensable means of transportation for people. Every city is vigorously building the subway. However, the construction environment of the subway is underground. Due to the uncertainty of the mechanical parameters of the ground and the unpredictability of the construction process, the underground engineering design and construction It is inevitable that there will be situations that do not conform to the actual stratum conditions. Therefore, it is necessary to monitor the construction information of the subway during the construction process and upload it to the monitoring technicians so that they can process, analyze and feed back to the construction and design in a timely manner, and then through the feedback of monitoring information. Correct the design and guide the construction; in the wireless communication system of the subway construction tunnel, due to the large bandwidth of the band-pass filter in the wireless receiver, the wireless receiver will receive the subway construction signal at the same time, there will also be interference signals from adjacent channels Entering the wireless receiver, when the intensity of the adjacent channel interference signal is high, the intensity of the subway construction signal received by the wireless receiver will be greatly reduced due to the overload and complete saturation of the preamplifier or mixer, resulting in the failure of the entire receiving circuit The signal-to-noise ratio deteriorates, the receiver sensitivity decreases, and weak signals are lost

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