Trimble MB-Two
Last updated
Last updated
The is a high-end, dual-frequency that can be configured as either base or rover.
In addition to providing precise position information, the MB-Two can estimate heading angle (it has dual-antenna support). This is useful for situations where a compass cannot provide reliable heading information, for example when flying close to metal constructs.
The following firmware options need to be selected when buying the device:
[X] [2] [N] [G] [W] [Y] [J] for 20Hz position updates and RTK support, 1cm horizontal and 2cm vertical position accuracy
[L] LBAND
[D] DUO - Dual Antenna Heading
[B] BEIDOU + [O] GALILEO, if needed
The antenna connector type on the device is MMCX. Suitable cables for the above antennas (SMA connector) can be found here:
The Trimble MB-Two is connected to a UART on the flight controller (GPS port) for data.
To power the module you will need a separate 3.3V power supply (the maximum consumption is 360mA).
:::note The module cannot be powered from a Pixhawk. :::
The pins on the 28-pin connector are numbered as shown below:
6
Vcc 3.3V
Power supply
14
GND
Connect to power the supply and GND of the Autopilot
15
TXD1
Connect to RX of the Autopilot
16
RXD1
Connect to TX of the Autopilot
The Trimble MB-Two requires two dual-frequency (L1/L2) antennas. A good example is the (which can be bought, for instance, from ).
First set the GPS protocol to Trimble ().
For heading estimation the two antennas need to be on the same level and at least 30 cm apart from each other. The direction that they are facing does not matter as it can be configured with the parameter.
:::note The GPS_YAW_OFFSET is the angle made by the baseline (the line between the two GPS antennas) relative to the vehicle x-axis (front/back axis, as shown ). :::
on which the Trimple will run using , and set the baud rate to 115200 using .
To activate heading fusion for the attitude estimation, set the parameter to enable Dual antenna heading.
:::note See also: :::
