Abstract
In this paper, we decode the PRN codes of the E5a and E5b signals broadcast by the Galileo GIOVE-A test satellite. The Galileo E5 band overlaps with Distance Measuring Equipment (DME) and Tactical Air Navigation (TACAN) bands. These navigation systems emit high-power pulses, causing severe interference to E5 signals and thus challenging the decoding process. We apply the 1.8 meter dish of the Stanford GNSS Monitor System to receive the satellite signals. The received data are processed in a chain of signal conditioning, Doppler wipeoff, secondary code wipeoff, code sequence demodulation, and code generator derivation. Two primary code sequences are revealed in each frequency band, E5a-I, E5a-Q, E5b-I, and E5b-Q. The E5 signals have a chip rate of 10.23 Mbps. All four primary codes have a period of 1msec with 10230 bits and are modulated by secondary codes. The secondary code of E5a-I has 20 bits and that of E5b-I has 4 bits. The secondary codes of E5a-Q and E5b-Q are both 100 bits.
Original language | English (US) |
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Pages | 936-946 |
Number of pages | 11 |
State | Published - 2007 |
Externally published | Yes |
Event | Institute of Navigation National Technical Meeting, NTM 2007 - San Diego, CA, United States Duration: Jan 22 2007 → Jan 24 2007 |
Other
Other | Institute of Navigation National Technical Meeting, NTM 2007 |
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Country/Territory | United States |
City | San Diego, CA |
Period | 1/22/07 → 1/24/07 |
ASJC Scopus subject areas
- General Engineering