GPS: Galileo reception possible on Kiwi? [working as of v1.178]
Does anyone understand the specifics of the Galileo E1 OS (open service) signal transmitted on the GPS/Navstar L1 C/A frequency? (1575.42 MHz) http://www.navipedia.net/index.php/Galileo_Signal_Plan
Specifically I'm wondering about the required bandwidth and the necessity of receiving and using the pilot signal in decoding. The main lobe of an L1 C/A BPSK signal is about 2 MHz wide. The IF filter in the GPS front-end chip of the Kiwi has a -3 dB bandwidth of 2.2 MHz.
The Galileo E1B data signal main lobe is about 4 MHz wide. The Kiwi front-end has 8 dB loss at 4 MHz b/w. But the E1C pilot signal center frequencies are at +/- 6.138 MHz; over 12 MHz b/w. The Kiwi front-end has 23 dB loss at 8 MHz b/w which is a problem. Is the pilot just an optional aid to weak signal acquisition or tracking loop performance? I.e. can you get by without using it?