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).
- 2016-12-24 18-42-52 Figure 1.png (93.91 KiB) Viewed 3452 times
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).
- 2016-12-24 18-36-47 Figure 1.png (44.07 KiB) Viewed 3452 times
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
