UCA antenna spacing for UWB DOA

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ERA
Posts: 1
Joined: Sun Apr 25, 2021 12:11 pm

UCA antenna spacing for UWB DOA

Post by ERA » Sun Apr 25, 2021 12:24 pm

Hello,

I made an UCA with a lambda/2 spacing @2GHz (0.075m). (same spacing for 200MHz to 1.7Ghz)
Used DOA alg = MUSIC.

conf1 : (works.. not bad 5-10 deg)
- f = 1.6GHz
- Gain Rx = 20.7 dB
- B = 10 kHz
- FIR = 100
- Decimation = 4
- DC comp = on

conf2 : (Don't works.. precision 45deg)
- f = .880GHz
- Gain Rx = 20.7 dB
- B = 10 kHz
- FIR = 100
- Decimation = 4
- DC comp = on

Is someone have a good experience about the settings for constant UCA spacing for wideband use ?

Thanks,
Erwan

rtlsdrblog
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Posts: 2942
Joined: Mon Nov 19, 2012 11:54 pm

Re: UCA antenna spacing for UWB DOA

Post by rtlsdrblog » Mon May 10, 2021 3:57 am

Are you testing indoors or in a high multipath environment?

As the spacing factor reduces with lower frequency, you will start to see multipath skew results much more significantly for a fixed size array.

There's really no way around using two or more different sized arrays for direction finding if you are looking to cover a very wide range of frequencies.

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