add new model DATAGNSS NANO RTK Receiver

- add new model
- add datagnss into the store list

common/source/docs/common-datagnss-nano-rcv-rtk.rst

@@ -0,0 +1,183 @@
+.. _common-datagnss-nano-rcv-rtk:
+
+=======================
+NANO Helix RTK receiver
+=======================
+NANO Helix RTK receiver is a high-precision RTK receiver designed and manufactured by DATAGNSS. 
+
+It's based on the new generation Allystar dual-core GNSS SoC. It supports RTK functionality with a maximum data update rate of 5Hz. 
+It includes two models, one is v1.0.0 without compass, and another is Rev.A with compass.
+
+.. image:: ../../../images/datagnss-nano/NANO-RCV-02-main.png
+	:target: ../_images/datagnss-nano/NANO-RCV-02-main.png
+
+.. note:: NANO Helix RTK Receiver doesn't support Moving Base mode.
+
+Where to Buy
+============
+
+- `DATAGNSS website <https://www.datagnss.com/>`_
+
+Key Features
+============
+
+- GPS/QZSS/BDS/GLONASS/GALILEO/IRNSS
+- Multi-bands, support L1+L5/L1+L2
+- Support RTK,output rate 5Hz
+- Standard UART serial interface
+- Lightweight only 26g
+- High performance antenna
+
+GNSS
+====
+   - Allystar CYNOSURE IV GNSS SOC
+   - Dual core
+   - 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
+   - Main power supply,4.7~5.2V
+
+Protocol
+========
+   - NMEA-0183 output
+   - RTCMv3 input/output
+
+Environment
+===========
+   - Operating temp. -20~85℃
+
+Dimession and weight
+====================
+   - 65*30mm
+   - 26g
+
+Pin definition
+==============
+The board is connected to the autopilot via UART interface.
+
+.. image:: ../../../images/datagnss-nano/nano-rcv-02-connector.png
+	:target: ../_images/datagnss-nano/nano-rcv-02-connector.png
+
+The 1.25mm pitch 6P connector (from Left PIN1 to PIN6) :
+
+   -  1: GND
+   -  2: NC
+   -  3: NC
+   -  4: Rx
+   -  5: Tx
+   -  6: 5V
+
+Please note that only Rev.A includes RTK and compass.
+If the model support compass, pin2 and pin3 output compass I2C interface.
+
+ArduPilot Setup
+===============
+For example, NANO Helix RTK Receiver is connected to the autopilot's SERIAL4 port, it should work with :
+
+- :ref:`SERIAL4_PROTOCOL <SERIAL4_PROTOCOL>` = 5
+
+
+Configuration
+=============
+RTK technology requires a base and a rover, with the base placed on the ground, which is referred to as the rover on the drone. 
+
+The data from the base needs to be transmitted to the drone via telemetry radio and inputted into the RTK receiver on the rover.
+
+.. image:: ../../../images/gem1305/setup-rtk-00.png
+	:target: ../_images/gem1305/setup-rtk-00.png
+
+NANO RTK Receiver family for UAV:
+
+.. image:: ../../../images/datagnss-nano/NANO-total-for-UAV-800x.png
+	:target: ../_images/datagnss-nano/NANO-total-for-UAV-800x.png
+
+Base station setup
+==================
+
+.. image:: ../../../images/datagnss-nano/NANO-GCS-01-600x.png
+	:target: ../_images/datagnss-nano/NANO-GCS-01-600x.png
+
+Connect the NANO RTK Receiver to your Laptop via USB.
+
+Setup the NANO RTK Receiver as a base station, and it is recommended to use Satrack software.
+
+- `Download Satrack <https://wiki.datagnss.com/images/e/ee/Satrack.zip>`_
+
+1. Open Satrack, then choose the com port, baud rate then connect the nano-rtk-rcv.
+
+   .. image:: ../../../images/gem1305/satrack-connect-device.png
+      :target: ../_images/gem1305/satrack-connect-device.png
+
+
+2. Enable RTCMv3 output
+
+   .. image:: ../../../images/gem1305/satrack-rtcm-output.png
+      :target: ../_images/gem1305/satrack-rtcm-output.png
+
+
+3. Disable NMEA data output
+
+   .. image:: ../../../images/gem1305/satrack-disable-nmea.png
+      :target: ../_images/gem1305/satrack-disable-nmea.png
+
+4. Config output rate to 1Hz
+
+   In base station mode, the RTCM data output rate must be set to 1Hz.
+
+   .. image:: ../../../images/gem1305/satrack-outputrate-1hz.png
+      :target: ../_images/gem1305/satrack-outputrate-1hz.png
+
+5. Config the base station fixed coordinates
+
+   There are two methods to set the coordinates of the base station:
+
+   5.1 According to the diagram below, Input the known coordinates.
+
+   Press ``Get now``, and modify the coordinates to the known values, then ``Send`` to apply the fixed coordinates.
+
+   .. image:: ../../../images/gem1305/satrack-cfg-fixedecef.png
+       :target: ../_images/gem1305/satrack-cfg-fixedecef.png
+
+   5.2 or, using the ``CFG-SURVEY`` meassage, config ``miniDuration`` and ``AccLimit``, then automatically calculate the average before proceeding with the setup.
+
+   .. image:: ../../../images/gem1305/satrack-cfg-survey.png
+       :target: ../_images/gem1305/satrack-cfg-survey.png
+
+   After completing the above operation, you can save the current configuration with ``CFG-SAVE`` message. 
+
+6. After completing the above configuration, open Mission Planner and finish the configuration on this page:
+
+.. image:: ../../../images/gem1305/mp-connect-base.png
+    :target: ../_images/gem1305/mp-connect-base.png
+
+
+Rover station (Aircraft) setup
+==============================
+
+.. image:: ../../../images/datagnss-nano/NANO-RCV-02-Total-800x.png
+	:target: ../_images/datagnss-nano/NANO-RCV-02-Total-800x.png
+
+You need to confirm in the Satrack software that all RTCM data outputs are disabled and all NMEA outputs are enabled.
+
+In Rover mode, the output rate must be set to 5Hz.
+
+.. note:: NANO Helix RTK Receiver do not support safety switch, so BRD_SAFETY_DEFLT needs to be set to 0 or a separate safety switch should be connected to the flight controller.
+
+After completing the above settings, you can write parameters to the flight controller.
+
+Resource
+========
+   - `DATAGNSS WiKi <https://wiki.datagnss.com>`__
+
+More information
+================
+
+   - `NANO Helix RTK Receiver <https://www.datagnss.com/collections/evk/products/nano-helix-rtk-receiver>`__
+   - `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>`__

common/source/docs/common-positioning-landing-page.rst

@@ -56,6 +56,7 @@ These GPS can incorporate real time kinematic data, either internally generated
     CUAV C-RTK2 PPK and RTK receiver<common-cuav-c-rtk2>
     CUAV C-RTK2 HP  Heading and RTK receiver<common-cuav-c-rtk2-hp>
     DATAGNSS GEM1305 RTK Receiver<common-datagnss-gem1305-rtk>
+    DATAGNSS NANO RTK Receiver<common-datagnss-nano-rcv-rtk>
     Emlid Reach RTK Receiver <common-reach-rtk-receiver>
     CubePilot HERE 3/3+ DroneCAN RTK GPS/IMU/Compass <https://docs.cubepilot.org/user-guides/here-3/here-3-manual>
     CubePilot HERE 4 DroneCAN RTK GPS/IMU/Compass (see note below) <https://docs.cubepilot.org/user-guides/here-4/here-4-manual>

common/source/docs/common-stores.rst

@@ -20,6 +20,7 @@ recommended for use with ArduPilot (in alphabetical order).  You may also want t
 * `Craft & Theory <http://www.craftandtheoryllc.com/store/>`__ (FrSky telemetry, MAUCH power modules)
 * `CUAV <https://store.cuav.net/>`__
 * `CubePilot <https://www.cubepilot.org>`__
+* `DATAGNSS <https://www.datagnss.com>`__
 * `DH Research <https://dh-research.com/>`__
 * `Drotek <https://drotek.com/>`__
 * `Emlid <https://store.emlid.com/>`__