Move PX4 Guide source into /docs (#24490)

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---------

Signed-off-by: Ramon Roche <mrpollo@gmail.com>
Co-authored-by: Ramon Roche <mrpollo@gmail.com>

docs/zh/gps_compass/rtk_gps_gem1305.md

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+# DATAGNSS GEM1305 RTK Receiver with antenna
+
+GEM1305 is a RTK receiver with antenna designed and manufactured by [DATAGNSS](https://www.datagnss.com/).
+
+GEM1305 is based on the new generation CYNOSURE IV dual-core GNSS SoC.
+It supports RTK functionality with a maximum data update rate of 10Hz, and comes with cables for connecting to GPS ports on most Pixhawk devices.
+
+<img src="../../assets/hardware/gps/datagnss_gem1305/datagnss-gem1305-02.png" width="500px" alt="DATAGNSS GEM1305 RTK Receiver">
+
+::: info
+
+- GEM1305 RTK doesn't support moving base mode yet.
+- GEM1305 RTK does not include a compass.
+
+:::
+
+## 购买渠道
+
+- [GEM1305 RTK receiver with antenna](https://www.datagnss.com/collections/gnss-for-drone/products/gem1305) (www.datagnss.com)
+
+  <img src="../../assets/hardware/gps/datagnss_gem1305/gem1305_hero.png" width="500px" alt="DATAGNSS GEM1305 RTK Receiver">
+
+- [DGM10 RTK Receiver](https://www.datagnss.com/collections/gnss-for-drone/products/dgm10-rtk-receiver) (same receiver in a casing).
+
+  ![dgm10\_rtk\_receiver.png](../../assets/hardware/gps/datagnss_gem1305/dgm10_rtk_receiver.png)
+
+## 主要特性
+
+- Full constellation, multi-frequency GNSS satellite receiver
+- Support RTK with up to 10hz output rate
+- Standard UART serial interface
+- Lightweight only 50g or 26g(NANO RTK receiver)
+- High performance antenna
+
+## Frequencies
+
+- GPS/QZSS: L1 C/A, L5C
+- GLONASS: L1OF
+- BEIDOU: B1I, B2a
+- GALILEO: E1, E5a
+- IRNSS: L5
+
+## GNSS
+
+- 128 hardware channels
+- 3D accuracy: **1.5m** CEP
+- RTK accuracy: **2cm** +1PPM(H), 3cm+1PPM(V)
+
+## Interface
+
+- UART: 230400bps default
+- SMA connector for antenna
+- Output rate 5Hz default, up to 10Hz
+- Main power supply: 4.7~5.2V
+
+## Protocol
+
+- NMEA-0183 output
+- RTCMv3 input/output
+
+## Environment
+
+- Operating temp. -20~85°C
+
+## Dimension and Weight
+
+- 55x55x12mm
+- 50g (GEM1305) 26g (NANO with Helix)
+
+## 针脚定义
+
+The board is connected to the autopilot via UART interface.
+
+![GEM1305 connector](../../assets/hardware/gps/datagnss_gem1305/gem1305_connector.png)
+
+The 1.25mm pitch 6P connector (from left: PIN1 to PIN6):
+
+- 1: GND
+- 2: NC
+- 3: PPS
+- 4: Rx
+- 5: Tx
+- 6: 5V
+
+The board does not include a compass and so does not require connections for a compass part.
+
+## 硬件安装
+
+RTK requires a base RTK module attached to the ground station, and a rover RTK module on the vehicle.
+The data from the base needs to be transmitted to the drone via telemetry radio and inputed into the RTK receiver on the rover.
+
+![RTK setup overview](../../assets/hardware/gps/datagnss_gem1305/setup_overview.png)
+
+The setup/connections for base and rover modules are shown below.
+
+### Base Setup (GCS)
+
+The base station connections are shown in the diagram below, along with the connection to a telemetry radio.
+
+![Base module setup](../../assets/hardware/gps/datagnss_gem1305/base_gnss_setup.png)
+
+Note that for the base we recommend the [NANO RTK Receiver](https://www.datagnss.com/collections/gnss-for-drone/products/multi-band-rtk-receiver-package) because it is easier to setup.
+
+<img src="../../assets/hardware/gps/datagnss_gem1305/nano_rtk_with_case.png" width="500px" alt="DATAGNSS NANO RTK Receiver">
+
+See to [How to setup Base station](https://wiki.datagnss.com/index.php/GEM1305-autopilot#Base_station_setup) for information on how to configure the module for use as a base station (not including step 6 and later, for which you would QGroundControl instead of Mission Planner).
+
+### Rover Setup (PX4)
+
+The rover setup showing connections to a GPS port and the (required) connection to a telemetry radio are shown in the diagram below.
+
+![Rover module and pixhawk big picture connections](../../assets/hardware/gps/datagnss_gem1305/rover_gnss_setup.png)
+
+The diagram below shows the wiring from the `GPS2` port on the Pixhawk 6c flight controller.
+Note that an appropriate cable is supplied for this purpose.
+
+![Rover module setup](../../assets/hardware/gps/datagnss_gem1305/pixhawk_connections.png)
+
+GPS and RTK configuration on PX4 via _QGroundControl_ is plug and play (see [RTK GPS](../gps_compass/rtk_gps.md) for more information).
+
+## Package List
+
+- GEM1305 RTK Receiver
+- DG-6P-C01, GH-1.25mm-6P cable
+
+## Resources
+
+- [GEM1305 2D drawing file](https://wiki.datagnss.com/index.php/GEM1305)
+- [NANO RTK Receiver 2D drawing file](https://wiki.datagnss.com/images/3/31/EVK-DG-1206_V.2.0.pdf)
+- [GEM1305 Wiki](https://wiki.datagnss.com/index.php/GEM1305) (DATAGNSS WiKi)
+- [HED-10L Heading RTK Receiver](https://wiki.datagnss.com/index.php/HED-10L)
+
+## More information
+
+- [NANO RTK Receiver](https://www.datagnss.com/collections/evk/products/tau951m-1312-tiny-evk)
+- [HELIX Antenna for RTK](https://www.datagnss.com/collections/rtk-antenna/products/smart-helix-antenna)
+- [RTK Antenna AGR6302G](https://www.datagnss.com/collections/rtk-antenna/products/antenna-agr6302g)
+- [AT400 RTK Antenna](https://www.datagnss.com/collections/rtk-antenna/products/at400-multi-band-antenna-for-rtk)