Doppler radar vehicle speed sensing system including means for c

Details Doppler radar vehicle speed sensing system including means for c Doppler radar vehicle speed sensing system including means for c

1980-06-05

1982-02-16

Groody, James J.

Communications: electrical

Selective

Having indication or alarm

340 53, 340554, 343 7VM, 343 177, G08G 2900, G01S 740

Patent

active

043161731

ABSTRACT:
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.

REFERENCES:
patent: 3745572 (1973-07-01), Sato et al.
patent: 3789950 (1974-02-01), Strenglein
patent: 4180816 (1979-12-01), Endo et al.
patent: 4225950 (1980-09-01), Kotera et al.

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