Performance comparison of semicodeless GPS receivers for LEO satellites |
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| Authors: | Oliver Montenbruck Miquel Garcia-Fernandez Jacob Williams |
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| Institution: | 1. German Space Operations Center, Deutsches Zentrum für Luft- und Raumfahrt, 82230, We?ling, Germany
2. Center for Space Research, University of Texas at Austin, Austin, TX, 78759, USA
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| Abstract: | This report provides a detailed performance analysis of three semicodeless dual-frequency GPS receivers for use in low Earth orbit (LEO). The test set comprises the IGOR receiver, which represents a follow-on of the flight-proven BlackJack receiver, as well as two geodetic receivers (NovAtel OEM4-G2 and Septentrio PolaRx2), which are entirely based on commercial-off-the-shelf technology (COTS). All three receivers are considered for upcoming flight projects or experiments and have undergone at least a preliminary environmental qualification program. Using extensive signal simulator tests, the cold start signal acquisition, tracking sensitivity, differential code biases, raw measurement accuracy, and navigation accuracy of each receiver have been assessed. All tests are based on a common scenario that is representative of an actual space mission and provides a realistic simulation of the signal dynamics and quality on a scientific LEO satellite. Compared to the other receivers, the IGOR instrument exhibits a superior tracking sensitivity and is thus best suited for occultation measurements with low tangent point altitudes. The OEM4-G2 and PolaRx2 receivers are likewise shown to properly track dual-frequency GPS signals and normal signal levels and to provide accurate code and carrier phase measurements. Given their limited resource requirements, these receivers appear well suited for precise orbit determination applications and ionospheric sounding onboard of microsatellites with tight mission budgets. |
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| Keywords: | Spaceborne GPS Semicodeless tracking IGOR OEM4-G2 PolaRx2 BlackJack |
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