Hello!
I've just make an experiment. I've got a RF generator to make a noise in L1. I used F = 1575MHz
I connect nut4nt 4-channel board with RA4 antenna array and couldn't find a correlation when a generator is on.
You can see a spectrum with synthetic noise (from a generator).
And my software can't see any sats (I should see five from my window)
.[ 2][ 2000 ][ 49596 ] corr = 2791 k = 2.0 (mean 1400)
.[ 6][ -3500 ][ 34585 ] corr = 2901 k = 1.5 (mean 1914)
.[ 7][ -2500 ][ 30721 ] corr = 3019 k = 1.7 (mean 1801)
.[ 9][ 2500 ][ 26770 ] corr = 3156 k = 1.7 (mean 1861)
.[30][ -2500 ][ 34273 ] corr = 3903 k = 1.8 (mean 2210)
Then I calculate something in matlab: corrcoef() between first channel and three others. And I sum all four channels with that coefficients.
And the jamming is gone (see screenshots attached, RED is a summed signal).
The results from software - all five satellites are visible!
**[ 2][ -1488 ][ 52789 ] corr = 1493 k = 4.0 (mean 377)
**[ 6][ -2677 ][ 48406 ] corr = 1643 k = 4.9 (mean 339)
**[ 7][ 2974 ][ 25913 ] corr = 2881 k = 8.6 (mean 334)
**[ 9][ 2989 ][ 753 ] corr = 1587 k = 3.8 (mean 423)
**[30][ -2545 ][ 34268 ] corr = 1459 k = 3.1 (mean 471)
There are signals I use.
https://goo.gl/J6hkMk
Antenna array vs jamming
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- Posts: 22
- Joined: Tue Sep 06, 2016 5:37 am
Antenna array vs jamming
Best regards,
Viktor
Amungo Navigation
Viktor
Amungo Navigation
Re: Antenna array vs jamming
Oh, very good discussion about this experiment - https://www.linkedin.com/groups/13506339
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- Posts: 22
- Joined: Tue Sep 06, 2016 5:37 am
Re: Antenna array vs jamming
Hello!
A day ago I've got a 'secret' Amungo's small antenna array. And I dumped 10 seconds of L1 GPS for you. It's about 10 seconds of signal and it's jammed only near the end (after 8th second at least).
You can download signals from nut4nt+secretRA4_array from here:
https://goo.gl/kXqlO6
I am going to process it in few days after that merciless new year holidays
Ans some photos:
'laboratory bench'
Secret small RA4 array with nut4nt
Small RA4 array
Small RA4 array
RF generator
A day ago I've got a 'secret' Amungo's small antenna array. And I dumped 10 seconds of L1 GPS for you. It's about 10 seconds of signal and it's jammed only near the end (after 8th second at least).
You can download signals from nut4nt+secretRA4_array from here:
https://goo.gl/kXqlO6
I am going to process it in few days after that merciless new year holidays

Ans some photos:
'laboratory bench'

Secret small RA4 array with nut4nt
Small RA4 array
Small RA4 array
RF generator
Best regards,
Viktor
Amungo Navigation
Viktor
Amungo Navigation
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