Honeywell Ring Laser Gyro (RLG) based inertial reference (IRS) and navigation (LASERNAV) systems have been performing exceedingly well and set a standard for excellence in air transport and business aviation applications. Now with the prospect of GPS being available for civil aviation use via its Standard Positioning Service (SPS) by 1987. Honeywell plans to introduce a line of integrated laser inertial and GPS navigation system products aimed at air transport and business aviation markets. The integrated system will physically package the two independent navigation systems viz., GPS and Inertial in one LRU while maintaining the functional separation of each. This paper describes the constituents of the integrated navigation system and its overall system architecture that is consistent with the philosophy of ARINC 700 series of avionics. The basic feature of the system architecture is that it preserves the integrity of the inertial reference system in a given flight and simultaneously provides pure inertial, autonomous (stand-alone) GPS and GPS-bounded inertial navigation outputs. The features of the sequential GPS receiver, sequencing schemes and acquisition strategies are described. The navigation filter algorithms that derive the autonomous GPS solution, the GPS/Inertial hybrid solution and inertial sensor calibration data, are presented. The clock-calibration and altitude-aiding techniques employed in autonomous GPS mode of operation to minimize the effects of unfavorable geometry and satellite obscuration are delineated. The special architectural features of the integrated system with regard to integrity monitoring and FAA certification are discussed.
Ring laser gyro inertial and GPS integrated navigation system for commercial aviation
Integriertes Ringlaser-Kreisel-Traegheits- und GPS Navigationssystem fuer die kommerzielle Luftfahrt
1986
8 Seiten, 8 Bilder
Conference paper
English
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