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88 lines
2.9 KiB
Markdown
88 lines
2.9 KiB
Markdown
# Freefly Systems RTK GPS
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The [Freefly Systems RTK GPS Module](https://store.freeflysystems.com/products/rtk-gps-ground-station) is a multiband [RTK GPS module](../gps_compass/rtk_gps.md) from Freefly Systems that provides highly reliable navigation.
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The modules can act as either rovers (when installed on an aircraft) or base stations (when plugged into a computer).
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Main features include:
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- Multiband (L1/L2) receiver (u-blox ZED-F9P)
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- Concurrent reception of all 4 GNSS (GPS, Galileo, GLONASS, BeiDou)
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- Built-in magnetometer (IST8310), baro (BMP388), RGB LED, safety switch and safety LED
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::: info
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This module can be used with PX4 v1.9 or above (support for the u-blox ZED-F9P was added in PX4 v1.9).
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:::
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## Where to Buy
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- [Freefly Store](https://store.freeflysystems.com/products/rtk-gps-ground-station)
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## Kit Contents
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An RTK GPS kit includes:
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- 2x GPS modules with antennas
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- 3m USB C to A cable
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- Magnetic quick-mount for base station module (1/4-20 thread for tripod mounting)
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- Screws to mount onto a Freefly AltaX
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## Configuration
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RTK setup and use on PX4 via _QGroundControl_ is largely plug and play (see [RTK GPS](../gps_compass/rtk_gps.md) for more information).
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For the aircraft, you should set the parameter [SER_GPS1_BAUD](../advanced_config/parameter_reference.md#SER_GPS1_BAUD) to 115200 8N1 to ensure that PX4 configures the correct baudrate.
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## Wiring and Connections
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The Freefly RTK GPS comes with an 8 pin JST-GH connector that can be plugged into a PixHawk autopilot.
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For use as a base station, the module has a USB-C connector
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### Pinout
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The Freefly GPS pinout is provided below.
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For some autopilots, like the [Hex Cube](../flight_controller/pixhawk-2.md) and [PixRacer](../flight_controller/pixracer.md), all that is needed is a 1-1 8-pin JST-GH cable.
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| Pin | Freefly GPS |
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| --- | ----------- |
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| 1 | VCC_5V |
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| 2 | GPS_RX |
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| 3 | GPS_TX |
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| 4 | I2C_SCL |
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| 5 | I2C_SDA |
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| 6 | BUTTON |
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| 7 | BUTTON_LED |
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| 8 | GND |
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## Specification
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- u-blox ZED-F9P GPS Receiver
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- Ultracap backup power for fast (hot-start) restarts
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- EMI shield over receiver for improved EMI immunity
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- IST8310 Magnetometer
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- Safety-switch and safety LED
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- RGB LEDs for status indication
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- NCP5623CMUTBG I2C Driver
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- BMP388 Baro on I2C bus
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- External, active antenna (Maxtena M7HCT)
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- SMA connector
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- STM32 MCU for future CAN-based communication
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- FW updates through USB connector
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- Connectivity:
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- USB-C
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- 2-way USB Switch to MCU and F9P
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- SMA for active antenna (20mA max)
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- 4-pin JST-GH CAN Bus (dronecode compliant)
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- 8-pin JST-GH UART/I2C
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-\*\* Power:
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- Input from either (diode OR'd):
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- USB (5V)
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- CAN (4.7 to 25.2V)
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- (4.7 to 25.2V)
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- Power consumption <1W
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## More Information
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More information can be found on [Freefly's Wiki](https://freefly.gitbook.io/freefly-public/products/rtk-gps)
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