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Signal analysis of the first GPS III satellite

Thoelert, Steffen and Steigenberger, Peter and Montenbruck, Oliver and Meurer, Michael (2019) Signal analysis of the first GPS III satellite. GPS Solutions, 23. Springer. doi: 10.1007/s10291-019-0882-7. ISSN 1080-5370.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://link.springer.com/article/10.1007%2Fs10291-019-0882-7


The signal-in-space of the first GPS Block III spacecraft is analyzed based on radio frequency measurements collected with a 30-m high-gain dish antenna as well as data from geodetic GPS receivers. The spectral properties and modulation characteristics are discussed with focus on the L1 band, which employs a novel interlaced majority voting technique for combination of the C/A, P(Y), and L1C data + pilot signal components. Compared to the preceding generation of Block IIF satellites, a modified shaping of the L1 transmit antenna gain pattern is found, which results in lower carrier-to-noise density ratios at mid to high elevations. Along with this, use of a separate transmission chain for the military M-code signal is evidenced through the analysis of in-phase/quadrature signal components and the derived transmit antenna gain variations. A high level of signal purity is demonstrated on all frequencies, which can be attributed to the use of a new, mostly digital, signal generation unit. Maps of code bias variations for selected signals are presented to quantify the achievable user tracking performance as a function of user receiver parameters. For the L5 signal, a notable reduction in digital distortions is obtained with respect to the Block IIF satellites, whereas analog distortions are found to be of similar magnitude. Thermally induced L5 phase variations found in the Block IIF satellites are no longer observed in GPS III. Using triple-frequency phase observations, a sub-centimeter consistency of the L1, L2, and L5 carriers is demonstrated.

Item URL in elib:https://elib.dlr.de/128388/
Document Type:Article
Title:Signal analysis of the first GPS III satellite
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Thoelert, SteffenIKNhttps://orcid.org/0000-0003-4653-318XUNSPECIFIED
Steigenberger, PeterDLR/GSOChttps://orcid.org/0000-0003-1905-6699UNSPECIFIED
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745XUNSPECIFIED
Date:6 July 2019
Journal or Publication Title:GPS Solutions
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Global positioning System; GPS III; Signal Analysis; Signal distortion; Signal Deformation; GPS L1C; Received power
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben GNSS2/Neue Dienste und Produkte (old), R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb (old), R - Project Navigation 4.0 (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Space Operations and Astronaut Training > Space Flight Technology
Deposited By: Thölert, Steffen
Deposited On:12 Jul 2019 14:24
Last Modified:14 Nov 2023 07:29

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