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Doppler radar vehicle speed sensing system including means for checking system operation based on the detection of low frequency Doppler frequency components
Doppler radar vehicle speed sensing system including means for checking system operation based on the detection of low frequency Doppler frequency components
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机译：多普勒雷达车辆速度感测系统，包括用于基于对低频多普勒频率分量的检测来检查系统运行的装置
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摘要
A vehicle speed sensing apparatus with means for checking its operation comprises a Doppler radar unit for producing a Doppler signal related to a vehicle speed and producing a speed signal from the Doppler signal, a first section for extracting low frequency components in the Doppler signal and a second section connected with the first section for producing an operation check signal. The extracted low frequency components correspond to vertical motion of the vehicle and are considerably lower than a Doppler signal frequency which corresponds to a minimum vehicle speed. If these low frequency components corresponding to vertical motion are not present, it is an indication that the speed sensing system is not operating properly.
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