GPS decoder chip: Radiolink M8N GPS, with u-blox UBX-M8030(M8), 72-channel, MMIC BGA715L7 from Infineon,is much better than single GNSS 7N,
Geomagnetic: HMC5983 from Honeywell,
Antenna : 2.5dbI high gain and selectivity ceramic antenna,
Power amplify IC: MMIC BGA715L7 from Infineon,
Double Filter: SAWF(Surface acoustic wave filter) form Murata.
50 centimeter position accuracy.
Positioning 20 satellites in 6 seconds as open ground.
Valley station-keeping ability.
Concurrent reception of GPS/QZSS L1 C/A,GLONASS L10F,Beidou B1,