Design antenna mounting for backpack

[mcorah]

The GPS backpack will have to GNSS (GPS) antennas (this enables us to get the actor/subject orientation). These need to be mounted to the GPS backpack.

Constraints:

• The top face of each antenna needs to face upward
• Antennas need to be separated horizontally by at least 0.5m
• We need to compute offsets from the GPS unit (which houses the IMU) and the antennas with an accuracy better than 5cm (let's aim for 2cm accuracy)

Design considerations: The backpack frame is from ~1.5cm formed tubing. I think we can mount the antennas to a pipe (aluminum or carbon fiber) with pipe clamps. Basti has a mount for the antennas with a camera mount and an AMP pattern hole pattern. We could consider using that patterned mount (and manufacturing more) and mounting to the pipe with pipe clamps.

Also, if mounting two antennas proves challenging, we can start by mounting only one to the prototype.

McMaster carries a wide variety of pipe and tube clamps: https://www.mcmaster.com/pipe-clamps/ Airlab also has a good deal of experience using these in systems (so Basti should be able to provide direction or at least a contact who may be helpful). An important step will be to identify and order an appropriate component.

[mcorah]

Note Tim Angert created the panel currently mounted to the first prototype.

[mcorah]

@YifanSu1301 (to assign to Hannah)

[mcorah]

This is done. I'll open new issues for installation.