Precise Relative Navigation for highly variable baselines using Carrier-based Differential GPS
- Paper number
IAC-08.C1.6.5
- Author
Mr. Alfredo Renga, University of Naples "Federico II", Italy
- Coauthor
Prof. Michele Grassi, University of Naples "Federico II", Italy
- Year
2008
- Abstract
Earth science missions based on distributed measurements, like spaceborne gravimetry, bistatic/multistatic synthetic aperture radars, or atmosphere and ionosphere profiling, rely strongly on a precise and robust relative navigation. In recent years many studies have addressed the problem of identifying and testing novel Carrier-based Differential GPS (CDGPS) filtering techniques and approaches for determining the relative position of formation flying satellites in different applications, with accuracy requirements ranging from the centimetre to the millimetre level. However, these techniques and approaches are usually developed and optimized for a specific application, where the inter-satellite distance does not experience large variations. Instead, there are missions in which the relative orbit configuration and the inter-satellite distance largely vary from few hundreds of meters to some hundreds of kilometres [1]-[2]. The main aim of this paper is to introduce some criteria to select the most appropriate filtering scheme for different orbital scenarios or orbital phases. For this reason the performance of purely kinematic and dynamic-based, such as Augmented and Extended Kalman filters, CDGPS techniques and approaches is numerically analyzed considering a dual frequency GPS receiver model and an orbital planning like the ones proposed for currently scheduled formation flying missions [2]. The analysis is conducted by using a numerical tool, developed in Matlab environment, which implements the GPS constellation, the satellites’ relative orbits, the GPS satellite signals, and main error sources including ionospheric path delay and multipath effects. Both for kinematic and for dynamic-based approaches the integer nature of double differenced carrier phase ambiguity is exploited by using Least-squares AMBiguity Decorrelation Adjustment (LAMBDA) method in order to obtain the best estimation of relative position. References: [1] G. Krieger and A. Moreira, “Spaceborne bi- and multistatic SAR: Potential and challenges,” Proc. Inst. Electr. Eng.—Radar, Sonar Navig., 153, 3, 184–198, 2006. [2] F. Caltagirone, A. Capuzi, A. Coletta, C. Galeazzi, E. Lopinto, A. Moccia, “SABRINA the Italian Mission for Endowing COSMO-SkyMed with Bistatic and Interferometric Capabilities”, Proceedings of EUSAR 2006, Dresden, Germany, May 16-18, 2006.
- Abstract document
- Manuscript document
IAC-08.C1.6.5.pdf (🔒 authorized access only).
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