172224 ⎘
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 continuous waves or intermittent trains of continuous waves, the intermittency not being for the purpose of determining direction or position line and the transit times being compared by measuring the phase difference
Sub-classes:BATTERY CELL POSITION DETERMINATION
#2Apparatus and method for mitigating interference when phase ranging among beacons and tags
#3Techniques for building pulse trains of emission sources
#4Long range navigation system having direct sequence spread spectrum (DSSS) RF signal
#5Laser distance measuring apparatus
#6Passive non-linear synthetic aperture radar and method thereof
#7Apparatus and method for determining a distance to an object
#8Interference control, SINR optimization and signaling enhancements to improve the performance of OTDOA measurements
#9Deployable intelligence and tracking system for homeland security and search and rescue
#10Radio frequency tag location system and method
#11Method for validating aircraft traffic control data
#12Interference control, SINR optimization and signaling enhancements to improve the performance of OTDOA measurements
#13Positioning with Time Sliced Single Frequency Networks
#14System and method for determining the bearing of a source location from a receiver location
#15Apparatus and method for mitigating interference when phase ranging among beacons and tags
#16Adaptive DME transmitter architecture