172232 ⎘
Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves; Systems for determining direction or position line using comparison of [1] the phase of the envelope of the change of frequency, due to Doppler effect, of the signal transmitted by an antenna moving, or appearing to move, in a cyclic path with [2] the phase of a reference signal, the frequency of this reference signal being synchronised with that of the cyclic movement, or apparent cyclic movement, of the antenna
Sub-classes:USING DOPPLER FOR MULTIPATH DETECTION AND MITIGATION IN RF-BASED POSITIONING
#2Determining the position of a radio tag using a learned model
#3Vehicle radar apparatus and control method thereof
#4Vehicle radar apparatus and control method thereof
#5Position determination device for terminal
#6Method for selecting signals of opportunity for passive coherent location
#7INTERPOLATING SEISMIC DATA
#8Interpolating seismic data