Global Navigation Satellite System

2. Compute Teams 2.1 Security Teams device security
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1. GNSS

Global Navigation Satellite System (GNSS) provides reliable positioning when outdoors.

Constellation Satellite Number
BEIDOU 35
GPS 31
GALILEO 27
GLONASS 24
IRNSS 7
QZSS 5

Above counts operational satellites as of 2025-08-01

Need at least 4 satellites to give you latitude, longitude, altitude and time.

  1. Get unobstructed view of sky
  2. Get as many satellites a possible

Multiple Frequency

All GNSS support multiple frequency bands:

gnss_freq
gnss_freq1010×505 202 KB

source: maxtena

All GNSS operate at higher frequencies (1164 MHz and above) than the LoRa device frequencies (928 MHz and below) that Team Compute use to complement them.

Phone Support

For high precision get a phone with Dual Frequency GNSS support (e.g. high end Samsung and Huawei phones).

2

Compass

Mobile phone built-in magetometer can be used as a compass.

1. Tips

  1. Move away from metal
  2. Make "figure 8s" in the air with your phone

2. 88.io Compass

88.io Web Console comes with a web based compass.

https://measure.contacttrace.com.au/

3. In Depth

3

GNSS Chipsets

u-blox

u-blox NEO-6M module supports GPS only

u-blox NEO-M8N module does support BeiDou, Galileo, GLONASS, GPS, QZSS

Quectel

Quectel L76K module does NOT support BeiDou, GLONASS, GPS, QZSS (note NO Galileo):

Unicore

Unicore UC6580 module supports BeiDou, Galileo, GLONASS, GPS, QZSS

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Centimetre Accuracy

In order to get accuracy down to centimetre level, Real Time Kinematic (RTK) or Post Processing Kinematic (PPK) can be used with your mobile phone.

We encourages citizens to build up their own RTK infrastructure in the communities.