The cold start of the space GPS receiver, i.e. thestart without any information about the receiver position, satelliteconstellation, and time, is complicated by a large Doppler shiftof a navigation signal caused by the satellite movement on theEarth orbit. That increases about five times the search space ofthe navigation signals compared to the standard GPS receiver.The paper investigates a method of the acceleration of the GPSreceiver cold start time designed for the pico- and femto-satellites.The proposed method is based on a combination of the parallelsearch in Doppler frequency and PRN codes and the serial searchin code phase delay. It can shorten the cold start time of the GPSreceiver operating on LEO orbit from about 300 to 60 secondswhile keeping the simplicity of FPGA signal processor and lowpower consumption. The developed algorithm was successfullyimplemented and tested in the piNAV GPS receiver. The energyrequired for the obtaining of the position fix was reduced fivetimes from 36 on to 7.7 Joules. This improvement enablesapplications of such receiver for the position determination insmaller satellites like Pocket Cube or femto-satellites with a lowerenergy budget than the Cube Satellite.
Start acceleration of the space GPS receiver
2020-11-22
International Journal of Electronics and Telecommunications; Vol 66, No 4 (2020); 745-752 ; 2300-1933
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC: | 629 |
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