To give the heli and absolute ground reference during landing, indoors, and when it's too low that the horizon sensors don't work, I was going to have 3 or 4 (maybe 5?) ultrasonic transceivers pointing outwards and downards from the base in a cone shape to detect the ground.
I was going to have them all fire transmit simultaneously and then listen for an echo (I figure I can assume they are all at a single point and I want maximum range on this thing so I'd prefer to fire them all at once rather than alternating), but I was wondering if this would cause desctructive interference? Constructive interference is what I want, and if I just fire them using a single control pulse, shouldn't that do it?
I'm more worried about the presence of desctructive interference rather than the lack of constructive interference- except the wavelength is significantly smaller than the distance between the transducers so I suppose synched transmitters it could still cause destructive interference due to sensor positioning
I was going to have them all fire transmit simultaneously and then listen for an echo (I figure I can assume they are all at a single point and I want maximum range on this thing so I'd prefer to fire them all at once rather than alternating), but I was wondering if this would cause desctructive interference? Constructive interference is what I want, and if I just fire them using a single control pulse, shouldn't that do it?
I'm more worried about the presence of desctructive interference rather than the lack of constructive interference- except the wavelength is significantly smaller than the distance between the transducers so I suppose synched transmitters it could still cause destructive interference due to sensor positioning
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