Showing papers on "GNSS augmentation published in 1994"
TL;DR: In this article, the basic principles of Global Navigation Satellite Systems (GNSS) are described together with problems that must be taken into account when using this kind of system, and the differences between GPS and the GLONASS system developed in the former Soviet Union are discussed.
38 citations
Patent•
28 Oct 1994
TL;DR: In this article, a method of apparatus for integrating Loran-C and satellite navigation system technologies in a manner in which the navigation signal transmissions are further modulated to provide a communications signal and a supplemental navigation signal, timed to provide additional position information.
Abstract: A method of apparatus for integrating Loran-C and satellite navigation system technologies in a manner in which the Loran-C navigation signal transmissions are further modulated to provide a communications signal and a supplemental navigation signal, timed to provide additional position information, and used to smooth user position and velocity data between augmentation data messages and between adding and deleting or losing satellite contributing signals.
30 citations
11 Apr 1994
TL;DR: The potential of quality control, i.e. failure detection, identification as well as failure repair, exclusively with means of onboard information for integrity monitoring is discussed, and this approach is called Aircraft Autonomous Integrity Monitoring (AAIM).
Abstract: Global Navigation Satellite Systems (GNSS) provide highest accuracy navigation capabilities when using differential techniques. Although the accuracy performance can comply with the tight limits as defined by ICAO or RTCA for precision approaches and taxi guidance, under real environment several effects onboard the aircraft degrade the quality of GNSS to an unacceptable level, so that GNSS would not be capable for sole means navigation. For system integrity checks, different approaches like Receiver Autonomous Integrity Monitoring (RAIM) or ground based overlay techniques are in discussion so far, but none is able to compensate insufficiencies of the satellite systems concerning dynamic environment and reliability. Therefore a combination of satellite information with inertial sensors suggests itself, because the latter are an ideal complement to GNSS due to their good dynamic behaviour, although they are characterized by long-term drift as a result of misalignment, accelerometer and gyro errors. Their budget varies with dynamic manoeuvres so that a preflight error determination and system calibration is insufficient. A complementary navigation system based on Kalman-filter techniques enables the estimation and compensation of different sensor errors of the inertial as well as the satellite part. In the paper the potential of quality control, i.e. failure detection, identification as well as failure repair, exclusively with means of onboard information for integrity monitoring is discussed. In consequence this approach is called Aircraft Autonomous Integrity Monitoring (AAIM). >
8 citations
01 Jan 1994
TL;DR: An overview of in-vehicle navigation systems as they are being introduced into the U.S. market, with a focus on the EtakGuide navigation unit.
Abstract: This article gives an overview of in-vehicle navigation systems as they are being introduced into the U.S. market. These products, for the most part, combine Global Positioning System (GPS) technology for navigation, digital moving maps for tracking, and a yellow pages directory of travel information. Focus is on the EtakGuide navigation unit.
1 citations
30 Oct 1994
TL;DR: This paper addresses a concept to accomplish the GNSS augmentation data link (GADL), which can provide aircraft operators with a system with which they voluntarily desire to equip without the need for mandatory and artificially expensive equipage.
Abstract: The advent of the Global Navigation Satellite System (GNSS) is having a profound impact on surveying, mapping, and navigation. Nowhere is this more evident than in civil aviation. In addition to the capability for cost effective precise positioning and navigation there is now the possibility to conceive systems based on this technology that for the first time can provide automatic dependent surveillance (ADS), cockpit display of traffic information (CDTI), and collision avoidance (CA) functions. To accomplish these functions a complementary data link is needed. Preferably this data link can enable the needed functionality without the need for the creation of an extensive ground infrastructure on behalf of the government and yet provide aircraft operators with a system with which they voluntarily desire to equip without the need for mandatory and artificially expensive equipage. This paper addresses a concept to accomplish these desired aviation functions which will be referred to here as the GNSS augmentation data link (GADL). >