btm library inspection system based on spectrum analysis technology
A spectrum analysis, trackside technology, applied in the field of railway signal equipment detection, can solve the problems of BTM antenna installation height change, BTM antenna resonance point change, testing and other problems
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Embodiment 1
[0032] Embodiment 1 BTM antenna height measurement
[0033] The BTM antenna height refers to the distance from the BTM antenna to the transponder. In the long-term operation of the train, the wheels and rails of the train will be worn to varying degrees, and the installation irregularities or loose screws will cause the distance between the BTM antenna and the transponder to change. At present, maintenance personnel mainly use a ruler to perform manual measurement, which is not only troublesome in the testing process but also has large measurement errors. The invention can realize automatic and high-precision measurement of the height of the BTM antenna.
[0034]When the train passes the receiving unit, the trackside processing center will measure the height in real time through the altimeter in the receiving unit. However, only the height measured when the BTM antenna is directly above the receiving unit is the height of the BTM antenna, and all other measurements are the h...
Embodiment 2
[0036] Embodiment 2 BTM antenna performance test
[0037] BTM antenna performance refers to the energy and frequency emitted by the BTM antenna. The frequency of the BTM antenna signal is a radio frequency signal of 27.095MHz. The BTM antenna works in a high temperature and vibration environment for a long time, which accelerates the aging speed of the electronic components in the BTM antenna, which may cause changes in the emitted energy and frequency of the BTM antenna. If the energy of the BTM antenna is too low, the transponder cannot be activated normally, resulting in point loss. If the energy of the antenna is too high, it may cause crosstalk. The transponder is activated by receiving 27.095MHz RF energy and converting it into electrical energy. So if the frequency of the BTM antenna changes, the transponder cannot be activated normally.
[0038] When the train passes above the receiving unit, the first receiving antenna in the receiving unit can receive the radio fr...
Embodiment 3
[0040] Embodiment 3 Train Environmental Interference Degree Measurement
[0041] The train environment interference degree refers to the electromagnetic environment noise around the BTM antenna. During the operation of the train, there will always be electromagnetic environmental noise, especially at the bottom of the train, where high-power traction equipment and dense cables are installed. The electromagnetic noise generated by the train will be superimposed on the uplink signal of the transponder to be received by the on-board BTM. The direct result is that the decoding time of the BTM becomes longer, the bit rate decreases, the bit error rate increases, and the number of decoding frames decreases. The more serious result is Transponder lost point.
[0042] At present, the maintenance personnel use the following method to test the environmental interference: disconnect the BTM antenna from the launch board, connect the cable directly to the spectrum analyzer, and test thro...
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