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73 lines
4.5 KiB
Markdown
73 lines
4.5 KiB
Markdown
# Microhard 직렬 라디오
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[Microhard Pico Serial Radios](https://microhardcorp.com/P900.php) integrate the _Microhard Pico Serial_ P900 RF module.
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기본 설정을 사용시, 출력이 1W로 설정의 대략적인 범위는 8km (5 마일)입니다.
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단일 지상국 라디오를 사용하여 지점 대 다중 지점 또는 메시를 사용하여 여러 기체와 통신 가능합니다.
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Radios can also be ordered that support secure/encrypted channels, although this is subject to export restriction.
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Manufacturers typically default-configure the radios in peer-to-peer mode and match the baud rate expected by PX4 and _QGroundControl_ (57600 baud).
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This allows plug and play telemetry when the radios are connected to the usual telemetry ports on a Pixhawk flight controllers (`TELEM1` or `TELEM2`) along with auto-detection of the connection in _QGroundControl_.
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Several manufacturers provide solutions based on these radios:
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- [ARK Electron Microhard Serial Telemetry Radio](../telemetry/ark_microhard_serial.md)
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- [Holybro Microhard P900 Telemetry Radio](../telemetry/holybro_microhard_p900_radio.md)
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## Range Tradeoffs
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The radio range depends on a number of factors, including: baud rate, power output, mode, whether forward error connection is enabled, whether encryption is enabled, antenna used etc.
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The selection of these parameters is a tradeoff:
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- increasing baud rate decreases radio range.
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- increasing radio power increases range, but decreases flight time.
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- point to multipoint means you can have a single ground station talking to multiple vehicles, but increases the bandwidth on the channel.
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- mesh configurations provide similar convenience and cost.
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The maximum range quoted in specifications is around 60km.
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ARK Electron suggest an approximate range of 8km with output power set to 1W is 8km and using default settings.
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## 설정
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For convenience, radios are usually default-configured so that they can be used with PX4 and _QGroundControl_ out of the box.
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Developers can modify the configuration.
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The only "requirement" is that the: ground radio, air radio, PX4, and _QGroundControl_ must all be set to use the **same** baud rate (and of course each MAVLink system must have a unique System ID).
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### PX4 설정
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PX4 is configured to use `TELEM1` for telemetry radios, with a default baud rate of 57600.
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You can configure PX4 to use any other free serial port a different baud rate, by following the instructions in [MAVLink Peripherals](../peripherals/mavlink_peripherals.md).
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### QGroundControl Configuration
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QGroundControl autodetects a serial telemetry connection with the baud rate 57600.
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For any other rate you will need to add a serial comms link that sets the rate that was used.
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See [Application Settings > Comms Links](https://docs.qgroundcontrol.com/master/en/qgc-user-guide/settings_view/settings_view.html).
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### Radio Configuration
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Microhard serial radios are configured using the _PicoConfig_ application (Windows only).
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This can be downloaded here: [PicoConfig-1.7.zip](https://arkelectron.com/wp-content/uploads/2021/04/PicoConfig-1.7.zip) (ARK Electron) or [picoconfig-1-10](https://docs.holybro.com/telemetry-radio/microhard-radio/download) (Holybro).
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In point-to-point operating modes, there must be a master to provide network synchronization for the system, so one radio should be configured to PP master and another should be configured to PP remote.
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The screen shots below show the default radio configuration settings for connecting to PX4 and _QGroundControl_.
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<img src="../../assets/hardware/telemetry/holybro_pico_config.png" width="400px" title="Holybro Pico Config" />
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<img src="../../assets/hardware/telemetry/holybro_pico_config1.png" width="400px" title="Holybro Pico Config" />
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The [Pico Series P900.Operating Manual.v1.8.7](https://github.com/PX4/PX4-Autopilot/raw/main/docs/assets/hardware/telemetry/Pico-Series-P900.Operating-Manual.v1.8.7.pdf) has additional information on radio configuration (including mesh and multipoint modes).
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### Mesh and Multipoint Modes
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Mesh and point to multi-point modes are supported, but all vehicles must have a unique Mavlink ID.
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Anecdotally:
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- At the highest link rate, with no FEC, we can have 201 drones in one mesh system transmitting 80 bytes once a second.
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- You can have multiple networks working together at the same time without mutual interference using "co-located systems".
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For example, to deploy more than 500 vehicles you would need to deploy three P900 mesh coordinators, each serving up to 201 drones in their respective local networks.
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