2026-04-17T19:26:33Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/3784022026-02-11T05:16:05Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Liu, Xiao author Closas Gómez, Pau author Gusi Amigó, Adrià author Rovira Garcia, Adrià author Sanz Subirana, Jaume author 2022-12 Recently, the Snapshot Real-Time Kinematic (SRTK) technique was demonstrated, which aims at achieving high accuracy navigation solutions with a very short signal collection. The main challenge in implementing SRTK is the generation of valid carrier-phase measurements, which relies on a data bit ambiguity (DBA) resolution process. For pilot signals, this step is equivalent to the correct selection of secondary code indexes (SCIs) from the ambiguous sets obtained from a multi-hypotheses (MH) acquisition process. Currently, SCI ambiguities are solved independently for each satellite. However, this method is ineffective when the snapshot signal is relatively short. In order to tackle this problem, this article proposes a new method that makes use of assistance data and processes information from all satellites to jointly solve the DBA issue. This new method is shown to be more effective in determining the correct SCI and enabling valid snapshot carrier-phase measurements, largely expanding the scope of high-accuracy snapshot positioning. This research was supported by the Albora Technologies and Universitat Politècnica de Catalunya with industrial PhD grant number DI 082 from the Generalitat de Catalunya and the project RTI2018-094295-B-I00 funded by the MCIN/AEI 10.13039/501100011033 which is co-funded by the FEDER programme. P.C. has been partially supported by the NSF under Awards CNS-1815349 and ECCS-1845833. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Processament del senyal Sistema de posicionament global Remote-sensing images Image processing Mobile geographic information systems Drone aircraft Data bit ambiguity Integer millisecond ambiguity Multi-hypotheses acquisition Secondary code indexes Snapshot positioning Sistema de posicionament global Imatges satel·litàries Localització per satèl·lit, Sistemes de Imatges--Processament Avions no tripulats A Method to determine secondary codes and carrier phases of short snapshot signals