Re: Reply to: Re: [Paparazzi-devel] distance measurement for landing. (Electro-Technik)

[Bernard Davison]

I'd think that the (5) ultrasonic or (2) laser range finder would be the 
cheapest most accurate methods.


On 21/11/2009, at 11:18 PM, Electro-Technik wrote:

> I guess that number 6) must the best option then..... After all we've all 
> seen this working on full size fighters landing successfully on the decks of 
> air-craft carriers! ;-)
> 
> Alan K.
> 
> 
>> "Even if local atmospheric pressure could be measured perfectly
>> accurately, with no errors, would this be the best parameter to use to
>> facilitate an automatic landing?"
> 
> From what  i have found out so far by reading and thinking all possible 
> scenarios a barometer will not do the job.
> What is needed is a definite, accurate and dependable method to measure the 
> distance from the ground with an accuracy of at least 10cm and a latency of 
> no more than 40ms.
> Something like
> 1) someone sitting to the landing gear with a hand held
>  laser distance meter :-)
> 2) A laser or optical  range meter but for all terrains.
> 3) A UWB range finder
> 4) A normal RF range finder
> 5) A powerful ultrasonic range finder.
> 6) A vision range finder either on the airplane or at the ground station.
> 6) a wire connected to a potentiometer which drags below the
>  aircraft  (say 50 cm lower) :-)
> Chris
> 
> 
> 
> 
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