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Pure Pilot Signals: How Short Can We Choose GNSS Spreading Codes?

Enneking, Christoph and Antreich, Felix and Appel, Manuel and de Almeida, Andre L. F. (2019) Pure Pilot Signals: How Short Can We Choose GNSS Spreading Codes? ITM 2019: International Technical Meeting of The Institute of Navigation, 28.-31. Jan. 2019, Reston, Virginia, USA.

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With the modernization of global navigation satellite systems (GNSS), a trend towards wideband navigation signals with high symbol rates and long spreading codes can be observed. However, low-complexity signals resembling the legacy coarse/acquisition (C/A) signals are still preferred for the purpose of rapid/low-energy signal acquisition. "Pure pilot" signals with short primary spreading codes and virtually no data or secondary code allow a particularly simple acquisition with few code-search bins and flexible predetection integration time. However, to allow reliable acquisition of any particular satellite, it must be ensured that self-interference received from other satellites is not excessive and can be decorrelated from the desired signal by simple coherent integration. To minimize the number of required code/Doppler acquisition bins, we formulate a dual-objective optimization problem to minimize both the spreading code length and the coherent integration time, under a number of constraints representing the acquisition reliability, satellite constellation or power levels and chip waveform. Results suggest that the spreading code length can be chosen as short as 600 to 800 chips, when combined with binary phase-shift keying (BPSK) at 0.5 to 1.0 MHz chipping rate. This provides a very promising perspective for the future design of fast-acquisition signals.

Item URL in elib:https://elib.dlr.de/126498/
Document Type:Conference or Workshop Item (Speech)
Title:Pure Pilot Signals: How Short Can We Choose GNSS Spreading Codes?
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Enneking, Christophchristoph.enneking (at) dlr.deUNSPECIFIED
Antreich, FelixFelix.Antreich (at) dlr.deUNSPECIFIED
Appel, Manuelmanuel.appel (at) dlr.deUNSPECIFIED
de Almeida, Andre L. F.andre (at) gtel.ufc.brUNSPECIFIED
Date:January 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Spreading code, Code-division multiple access (CDMA), fast acquisition, time-to-first-fix (TTFF), pilot signal, global navigation satellite system (GNSS)
Event Title:ITM 2019: International Technical Meeting of The Institute of Navigation
Event Location:Reston, Virginia, USA
Event Type:international Conference
Event Dates:28.-31. Jan. 2019
Organizer:Institute of Navigation (ION)
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 - Project Navigation 4.0
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Enneking, Christoph
Deposited On:22 Feb 2019 09:28
Last Modified:22 Feb 2019 09:28

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