Some customers have been experiencing Russian GPS Jamming in Baltic countries, where the GPS doesn’t return to the correct location and it has to be fully rebooted.
A way around this is would be to operate the units in GLONASS only mode and this is probably the easiest way to safeguard against GPS Jamming. The signals of the two types of satellites are very close together and it is extremely difficult to jam one frequency and keep the other frequency unaffected.
GPS, the centre frequencies are 1575.42 MHz (L1), 1227.6 MHz (L2) and 1176.45 MHz (L5).
GLONASS operates as frequency divisional multiple access (FDMA) and there are two operational centre frequencies 1602 MHz (L1) and 1246 MHz (L2) and at 1207.14 MHz (L3). GLONASS over this decade will also introduce Code Divisional Multiple Access (CDMA) similar to GPS.
GALILEO has a range of frequencies assigned in the L-band as follows:
E2 – L1 – E1 – Centre frequency 1575.42 MHz (band from 1559MHz – 1591MHz).
E5A – Centre frequency 1176.45 MHz (band from 1164 MHz – 1188 MHz).
E5B – Centre frequency 1207.14 MHz (band from 1188 MHz – 1215 MHz).
E6 – Centre frequency 1278,75 MHz (band from 1260 MHz – 1300 MHz).
Please take a look at the current GPS160 manual, which shows how to change the DIP switches inside the units to make them operate in GLONASS only modes.