172219 ⎘
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 a comparison of transit time of synchronised signals transmitted from non-directional antennas or antenna systems spaced apart, i.e. path-difference systems the synchronised signals being frequency modulations on carrier waves and the transit times being compared by measuring difference of instantaneous frequencies of received carrier waves
METHOD FOR SEPARATING LORAN SKY AND GROUND WAVES BASED ON LEVENBERG-MARQUART ALGORITHM
#2Device for modulating a microwave signal, transponder including such a device, and responder beacon equipped with such a transponder
#3Method and device for position determination
#4Ambiguity resolution in positioning measurements
#5Apparatus for transmitting positioning signal, positioning system including the apparatus, and system for transmitting positioning signal