1
K Tysen Mueller, Peter V W Loomis, Rudolph M Kalafus, Leonid Sheynblat: Networked differential GPS system. Trimble Navigation, Thomas E Schatzel, June 21, 1994: US05323322 (326 worldwide citation)

An embodiment of the present invention relates to a worldwide network of differential GPS reference stations (NDGPS) that continually track the entire GPS satellite constellation and provide interpolations of reference station corrections tailored for particular user locations between the reference ...


2
Rudolph M Kalafus: Wide augmentation system retrofit receiver. Trimble Navigation, Wagner Murabito&Hao, March 2, 1999: US05877725 (100 worldwide citation)

The present invention comprises a Global Positioning System (GPS) Wide Area Augmentation System (WAAS) retrofit receiver. In one embodiment the present invention includes a receiver adapted to receive WAAS messages via an antenna. The receiver is further adapted to translate the WAAS messages into R ...


3
Rudolph M Kalafus, Ralph F Eschenbach: Inexpensive monitoring technique for achieving high level integrity monitoring for differential GPS. Trimble Navigation, Wagner Murabito & Hao, October 19, 1999: US05969670 (44 worldwide citation)

A dual global positioning system (GPS) receiver navigation system. The system of the present invention includes a primary GPS receiver adapted to determine a first position. The primary GPS receiver is certified to a first integrity level and is further adapted to provide GPS navigation data to an e ...


4
Rudolph M Kalafus, Paul Braisted: System for using differential GPS receivers with autopilot systems for category III precision approaches. Trimble Navigation, Wagner Murabito & Hao, August 31, 1999: US05945943 (14 worldwide citation)

A precision approach capable dual differential global positioning system (DGPS) receiver avionics system. The system of the present invention includes a first and a second DGPS receiver. The first and second DGPS receivers are both adapted to interface with an autopilot in an aircraft. The DGPS rece ...


5
Rudolph M Kalafus, Paul Braisted: System for using differential GPS receivers with autopilot systems for category III precision approaches. Trimble Navigation, Wagner Murabito & Hao, January 29, 2002: US06342853 (13 worldwide citation)

A precision approach capable dual differential global positioning system (DGPS) receiver avionics system. The system of the present invention includes a first and a second DGPS receiver. The first and second DGPS receivers are both adapted to interface with an autopilot in an aircraft. The DGPS rece ...


6
Rudolph M Kalafus: VHF/radar transponder collision avoidance aid. The United States of America represented by the Secretary of Transportation, Otto M Wildensteiner, August 4, 1987: US04684949 (11 worldwide citation)

A radiotelephone and a radar transponder are interconnected in such a manner as to establish a VHF communications link via the radiotelephone in response to interrogation of the radar transponder. The radar transponder will ordinarily be periodically enabled and will transmit a code which partially ...