| 摘要 |
FIELD: railway transport. SUBSTANCE: track sensor has microwave oscillator, oscillator power divider, directional coupler, transmit-receive antenna and phase detector. Oscillator output is connected with power divider input, one output of power divider being connected with input of directional coupler and the other, with reference input of phase detector whose signal input is connected with output of side arm of directional coupler. Output of directional coupler is connected with antenna input. Antenna is installed at rail inner side with aperture pointed to rail head side. EFFECT: enhanced protection from noise generated by brake shoes of electromagnetic brakes. |
