[SystemSafety] a public beta phase ??? [No Classification]

[GRAZEBROOK, Alvery N]

> > radar reflector idea has merit. 
>
> Don't you have to keep them pretty clean? That's not going to work well on British cars.......
>
> What about RFID short-range transponders?
>
> PBL
[] 
Typically you put Radar reflectors inside plastic canisters which are transparent to the radio frequency range used. The reflective surfaces remain clean, and any muck on the outside just attenuates the signal a bit. The main problem with them is that they have to be a multiple of the wavelength of the radar. So for a 25-40 GHz radar, wavelength is of the order of 10mm, so minimum size - probably at least 30mm sphere. Easy to design-in, harder to retrofit and maintain aerodynamics and aesthetics. 

Short-range transponders would be smaller, but require energy. 

Cheers,
	Alvery

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