Doppler echo indicator

Doppler effect / Doppler shift

echo location/echo ranging

instantaneous vertical speed indicator / instantaneous vertical-speed indicator (IVSI)

Doppler effect alarm

doppler frequency shift

pulse Doppler radar

Doppler navigation

Doppler navigator

Doppler radar

pulse-Doppler locator

Doppler beam sharpening (DBS)

Doppler processor

pulse-Doppler single target track mode

pulse-repetition frequency ranging Doppler radar

Doppler-inertial guidance navigational and attack system

Doppler null

pulse Doppler

pulse Doppler jamming

range gate pulse Doppler radar

high resolution Doppler imager

E – ECHO

echo (returned signal)

echo depth finder

echo sounder

echo sounding

bottom echo

bottom echo signal

coherent echo

coherent echo modulation and detection

echo area

echo frequency

echo intensity