Inverted pseudolite positioning and some applications

In this paper the inverted pseudolite positioning system, comprising a 'constellation' of GPS receivers that tracks a mobile pseudolite, is discussed Two configurations of the inverted positioning system are described. The implementation challenges for the pseudolite-based inverted positioning system, including geometry optimization, multipath mitigation and minimization of the impact of GPS receiver location errors, have been investigated. Several applications of the inverted positioning concept have been identified, including deformation monitoring and navigation services based on pseudolite installed on stratospheric airships. A static experiment was carried out using six NovAtel GPS receivers and two IntegriNautics IN200CXL pseudolite instruments, on the UNSW campus, on the 4(th) April 2001. The experimental setup and operational procedures are described In detail. The carrier phase measurements have been processed in an 'inverted' mode. The results indicate that the potential accuracy of 'inverted' phase-based positioning is better than 5mm. The static experiment has indicated that the two configurations for the inverted positioning are feasible in practice.