US2268643A
(en )
1942-01-06
Frequency modulation distance finder
US2907999A
(en )
1959-10-06
Determining relative position by means of transit time of waves
US4142189A
(en )
1979-02-27
Radar system
USRE23050E
(en )
1948-11-23
Radio beacon
US2453169A
(en )
1948-11-09
Radio ground clearance indicator
US3921169A
(en )
1975-11-18
Multiple mode radiometric system with range detection capability
GB533538A
(en )
1941-02-14
Improvements in or relating to systems for measuring and indicating terrain clearance and the like by the reflection of electromagnetic waves
US4292638A
(en )
1981-09-29
Augmented radiometric system
US2977568A
(en )
1961-03-28
Frequency-modulated echo ranging equipment
GB1483236A
(en )
1977-08-17
Device for indicating changes in the position of an object
GB1489554A
(en )
1977-10-19
Method for classifying timber
GB655396A
(en )
1951-07-18
Improvements in or relating to radio distance-measuring apparatus utilizing the doppler effect
US3386095A
(en )
1968-05-28
Doppler type correlation system
US4118701A
(en )
1978-10-03
FM/CW radar system
GB586126A
(en )
1947-03-07
Improvements relating to determining distance by means of electromagnetic waves
US3276015A
(en )
1966-09-27
Methods of and apparatus for measuring distances
SU415616A1
(enrdf_load_stackoverflow )
1974-02-15
US4050015A
(en )
1977-09-20
Control of microwave generator-cavity resonator combinations for gas analyzer
US2613348A
(en )
1952-10-07
Frequency modulation system
US2421785A
(en )
1947-06-10
Electric altimeter
US2551828A
(en )
1951-05-08
Radio beacon
US3217322A
(en )
1965-11-09
F.m. radar system
US2966676A
(en )
1960-12-27
Electronic apparatus and method for measuring distance
SU397877A1
(ru )
1973-09-17
Устройство для обнаружения неоднородностей в массивах горных пород
Tuska
1944
Historical notes on the determination of distance by timed radio waves