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Glonass L1 L2 L3 CDMA frequency #715

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@Narugakuruga

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@Narugakuruga

According to glonass official ICDs. I found the following CDMA frequency.
L1:1600.995 MHz
L2:1248.06 MHz
L3:1202.025 MHz
Cross reference with an research article on new GLONASS K2 sat https://www.gpsworld.com/glonass-cdma-signals-now-on-l1-l2/
We can add that to gpstest codebase and just in case some GNSS chipset support it in the foreseeable future.
The current L1 CDMA frequency is wrong in the code

BTW we can rename those signals as glonass is well-known as FDMA modulation. CDMA is something absolute new to it.
Maybe L1-C L2-C is good to tell it?
But for beginners it could be confused with GPS L1C, which is already on some smartphone today. People may wondering "Glonass use similar tech like GPS III ?"

The official name is L1OC, L2OC, L3OC. They are longer thus very unlikely to be misread by users.

L1 CDMA is the most accurate name but seem unnecessary.

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