Inventors:
Roy M. Stulting - Scottsdale AZ
Stanley W. Attwood - Scottsdale AZ
Assignee:
Motorola Inc. - Schaumburg IL
International Classification:
G01R 2302
Abstract:
The Doppler is converted to digital or a square wave signal after which a first counter is used to count total full Doppler cycles by counting the positive going zero crossings, a second counter counts relatively high frequency pulses from the beginning of each cycle until the end or until the reception of a read-out pulse, whichever occurs sooner, and a third counter counts the high frequency clock pulses from the beginning of each cycle until the end. When the read-out pulse is received the partial Doppler cycle count in the second counter is divided by the full Doppler cycle count in the third counter to obtain a fraction indicative of the partial Doppler cycle, which fraction is added to the total full Doppler count in the first counter to obtain a measure of Doppler cycles from the start until the read-out pulse is received.