172220 ⎘
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 pulses or equivalent modulations on carrier waves and the transit times being compared by measuring the difference in arrival time of a significant part of the modulations, e.g. LORAN systems
Sub-classes:ULTRA-WIDEBAND LOCATION SYSTEMS AND METHODS
#2SYSTEM AND METHOD FOR DETECTING THE JAMMING OR SPOOFING OF GEOLOCATION INFORMATION AND SWITCHING TO A BACKUP LOCATION SYSTEM AND METHOD
#3ULTRA-WIDEBAND LOCATION SYSTEMS AND METHODS
#4SYSTEM AND METHOD FOR GEOLOCATION IDENTIFICATION AND ACCURACY ASSESSMENT OF FIXED WIRELESS CPE ENDPOINTS
#5Asynchronous time difference of arrival ranging method for passive-listening devices
#6Ultra-wideband location systems and methods
#7METHOD FOR SEPARATING LORAN SKY AND GROUND WAVES BASED ON LEVENBERG-MARQUART ALGORITHM
#8Method and apparatus for synchronising a location network
#9Transmission of signals for ranging, timing, and data transfer
#10Ultra-wideband location systems and methods
#11Ultra-wideband indoor location system and method
#12Ultra-wideband location systems and methods
#13System and methods for a private eLoran service
#14Hyperbolic waveform for code-division multiple-access multiple-input multiple-output radar
#15Method and apparatus for synchronising a location network
#16Loran device with electrically short antenna and crystal resonator and related methods
#17Techniques for building pulse trains of emission sources
#18Long range navigation system having direct sequence spread spectrum (DSSS) RF signal
#19Enhanced LORAN (eLORAN) system having corrected additional secondary factor (ASF) data
#20System and methods for a private eLoran service
#21Navigation system for GPS denied environments
#22Method and device for chronologically synchronizing a kinematic location network
#23Safety system, method and computer program for remotely controlled work vehicles
#24Protected positioning, navigation, or timing signals resistant to spoofing
#25Positioning system and method with multipath mitigation
#26Apparatus for monitoring emergency response vessel position
#27Method and device for chronologically synchronizing a kinematic location network
#28LOW FREQUENCY/MEDIUM FREQUENCY (LF/MF) MULTI MODE ANTENNA/RECEIVER
#29PILOT BEACON SYSTEM FOR INDOOR POSITIONING
#30Using Bluetooth low energy
#31Method and apparatus for positioning user equipment
#32Radar device, radar positioning system, radar positioning method, and computer readable media storing radar positioning program
#33GNSS POSITIONING IN ELEVATOR
#34Pilot beacon system for indoor positioning
#35Cell organization and transmission schemes in a wide area positioning system (WAPS)
#36Method, and apparatus for determining the position using radio signals
#37Amplifier providing power recovery from a narrow-band antenna
#38Method for positioning user equipment in a wireless mobile communication system, and apparatus for performing the method
#39Triply Redundant Integrated Navigation and Asset Visibility System
#40Triply redundant integrated navigation and asset visibility system
#41Methods and apparatus for improved reference signal correlation characteristics
#42Method and apparatus for sequencing and correlating a positioning reference signal
#43Robust low-frequency spread-spectrum navigation system
#44Robust low-frequency spread-spectrum navigation system
#45Robust low-frequency spread-spectrum navigation system
#46Robust low-frequency spread-spectrum navigation system
#47Amplifier providing power recovery from a narrow-band antenna
#48Loran-based underground geolocation, navigation and communication system
#49Inter-network operation of multiple location networks
#50Triply redundant integrated navigation and asset visibility system
#51Robust low-frequency spread-spectrum navigation system
#52Satellite and local system position determination
#53Frequency coherence within a location network
#54Satellite and local system position determination
#55Locating a roving position receiver in a location network
#56System and method for multipath mitigation using clustered positioning signals
#57Tracking system utilizing antenna multiplexing
#58Method of and apparatus for increasing the peak output pulse power delivered by capacitor-driven high-power diode and square-loop saturable reactor pulse compression generators with the aid of minority carrier sweep-out circuits within the pulse compression circuit
#59Method and device for chronologically synchronizing a location network
#60Antenna methods and systems for wearable devices
#61Systems and methods for augmenting a satellite based navigation system with alternative position and timing data