BSM frequency stability (impressive)

OldtimeRadar

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Does anyone find it interesting that BSM of cars seem to maintain super tight frequency tolerances even when aging and varying outdoor temperatures, while expensive radar guns (K-band, but especially Ka-band, like the Stalker units) seem to drift all over the place?
 

NoahWL

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I'd be interested in a more concise and technical explanation from someone more experienced. But a quick search led me to this patent: https://patents.google.com/patent/US4435712

Basically, the FMCW radar used in BSM systems requires a very stable frequency to function with precision. The method used for determining distance is much more sensitive to drift over time than that of determining speed with CW Doppler radar.
 

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