Experimental Analysis of GPS/Pseudolite/INS Integration for Aircraft Precision Approach and Landing

Abstract

This paper analyses flight trial results to study the overall performance and limitations of a GPS/Pseudolite/INS integration approach for aircraft precision approach and landing applications. For this purpose, the series of approaches were flown at Wedderburn Airfield, Australia. The analysed results show that pseudolite signals strengthen the ranging signal availability and the satellite geometry. Most of the geometry enhancement is found in the vertical position component, improving the accuracy of the aircraft's altitude. Furthermore, the results reveal that the inclusion of a pseudolite enhances both internal and external reliabilities. A dramatic improvement of the external reliability in the vertical component is observed.

Background and Recent Advances in the Locata Terrestrial Positioning and Timing Technology

“…Technical issues, such as antenna offsets between different systems, the influence of the number, location and geometric distribution of the LocataLites on ambiguity resolution, positioning accuracy, system reliability, and stability had been analysed via a series of flight tests. At first by simulations [1], and subsequently by real world tests that were carried out at Wedderburn Airfield, Australia [58], and south of Canberra, Australia [59]. A series of Unmanned Aerial Vehicle (UAV) flight tests were also conducted at the Advanced Navigation Technology Center, at the US Air Force Institute of Technology [29].…”

GPS-compatible indoor-positioning methods for indoor-outdoor seamless robot navigation

“…Pseudolites (pseudo-satellites), originally used to test GPS signals on the ground, and have been studied for applications such as bridge monitoring [11], aircraft navigation at airports [12], and pedestrian navigation in urban canyon [13]. Since pseudolites use the same method as that of GPS (i.e., trilateration with time-of-arrival of signals), they have the potential to accomplish centimeter-level positioning accuracy if the carrier phase is used for positioning.…”

Indoor multipath effect study on the Locata system

“…Locata's solution is very stable (DOP 1.1) while GPS's altering between 0.8 and 2.0, due to changing geometric distribution of the satellites. Therefore static geometry can be utilised for GNSS integrity controls, especially in the strategic areas such as airports and harbours (Lee et al 2008). Unfortunately, any integration will be limited to Locata component in an indoor environment.…”