Re: [AFMUG] OT Helicopter on Mars

Fri, 19 Feb 2021 11:17:31 -0800

I'm going to guess that there is some sort of homing beacon on the rover. With a 90 second TTL, I don't think it's going to go too far. In fact, there is probably some sort of contingency plan to have the rover pick it up and plop it back down on its charging platform.


bp
<part15sbs{at}gmail{dot}com>
On 2/19/2021 10:57 AM, Adam Moffett wrote:

....I suppose you could still navigate by a local magnetic field as long as you know it's position and shape.

On 2/19/2021 1:50 PM, Adam Moffett wrote:

I was going to say the same thing.  The rotating molten blob in the middle makes our magnetic field way stronger.  There's a feedback loop between flowing iron passing through magnetic fields making a current which increases magnetism which increases current, etc.  I'm sure I'm describing it poorly.

I just looked up and Mars is supposed to have localized magnetic fields from iron deposits in the crust, but not a global magnetic field like Earth.


On 2/19/2021 12:26 PM, Bill Prince wrote:

Does Mars have a molten core? I would think that's necessary for a magnetic pole. In fact, the major reason Mars has very little atmosphere is because there is no magnetic pole, or at least too little to provide protection from the solar wind.


bp
<part15sbs{at}gmail{dot}com>
On 2/19/2021 8:31 AM, Chuck McCown via AF wrote:
It probably has a magnetic pole.  And they can get a celestial reference too. 
 
Sent: Friday, February 19, 2021 8:58 AM
Subject: Re: [AFMUG] OT Helicopter on Mars
 

Assuming gyroscopic effect still works on mars? That would be one way to keep a reference ”north”

 

Thank you,

Brian Webster

www.wirelessmapping.com

 

From: AF [mailto:af-boun...@af.afmug.com] On Behalf Of Matt Hoppes
Sent: Thursday, February 18, 2021 6:22 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] OT Helicopter on Mars

 

It’s only got a 90 second flight time. So presumably it doesn’t get very far away.

 

I would guess radio ranging and camera would allow it to get guidance - similar to how missals could kick into radio station signals to find a city back in the 60s.



On Feb 18, 2021, at 6:09 PM, Jaime Solorza <losguyswirel...@gmail.com> wrote:



BFM

 

On Thu, Feb 18, 2021, 3:38 PM Chuck McCown via AF <af@af.afmug.com> wrote:

I wonder how it navigates.  I presume a barometric altimeter will work there.  But how would they get bearing and distance from the ground vehicle?  You could use a Doppler antenna array to get a bearing I suppose.  And maybe some kind of DME for distance.  Like to see a write up on that. 

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