Doppler radar with target velocity direction and range...
Doppler radar with target velocity direction indicator
Doppler shift motion detector with variable power
Doppler signal frequency converter
Doppler sonar utilizing period measurement with thresholded...
Doppler speed log
Doppler tracking method for object imaging from radar returns
Doppler ultrasound monitor system
Doppler vor
Doppler vor beacons
Doppler-type projectile velocity measurement and...
Double analog/digital automatic power controlling device in...
Downdraft velocity estimator for a microburst precursor...
Driver alerting device
Dual beam radar system
Dual continuous wave carrier signals distance measuring system
Dual frequency global positioning system
Dual mode radiometric system
Dual mode scanner/tracker
Dual mode sonar system