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What are the differences between three GPS systems?

1. Size difference: The size and antenna size are different, 251>181>121

2. Functional difference: 251 with compass, generally used in INAV firmware, BF can also be used, without connecting the compass master (blue and green lines are not required). 181 and 121 without compass are also small in size, BF firmware is recommended first.

3. In terms of signal: The 251 antenna and 181 antenna are slightly faster than the 121 antenna in searching for stars.

4. Protocol difference: 251 is a dual protocol, 181 and 121 are single protocols.

Product specifications:

Chip: M10 (10th generation chip)

Frequency: GPS L1, GLONASS L1, BDS B1, GALILEO E1, SBAS L1. QZSS L1

Power supply: 5V

Dimensions: 12mm * 16mm * 4.6mm (121), 18mm * 18mm * 8mm (181), 25mm * 25mm * 8mm (251)

Antenna: Ceramic antenna (oil spraying process, anti scratch oxidation)

Receiving channels: 72 search channels

Weight: 2.4g (121), 7.7g (181), 12.5g (251)

Baud rate: 115200 (121), 9600dps (181), 115200dps (251)

Output frequency: 1Hz-10Hz, default 10Hz

Speed accuracy: 0.05m/s

Horizontal positioning accuracy: 2D ACC1.5m (outdoor)

Receiver sensitivity: Trace -162dBm, Capture -160dBm

Dynamics

Height: 50000m

Speed: 500m/s

Acceleration: 4G

Working temperature: -40 ℃ -+85 ℃

Storage temperature: -40 ℃ -+105 ℃

Note:

Signal light flashing: Received signal

Signal light constantly on: no signal received

As the GPS chip is a new 10th generation chip, the flight control requires firmware firmware 4.29 or above, and firmware below 4.29 uses the NMEA protocol.