Search found 8 matches

by RJsaurus
Tue Apr 20, 2021 7:04 pm
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

Ahhh thank you, yes we always see one peak. We do turn it off for calibrate.
by RJsaurus
Sat Apr 17, 2021 3:53 pm
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

For some reason I thought these antennas were for way lower frequencies. Thanks for the tip. Gonna run with that and with tracking on the amateur band rather than all the way down here. After calibration I think I sometimes forget to change the decimation and FIR. What does the spectrum graph look l...
by RJsaurus
Wed Apr 14, 2021 1:44 pm
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

Ok, we switched over to MUSIC. In that video we used a spacing factor of .25 This isn't the exact setup from the video but it's pretty close: https://media.discordapp.net/attachments/580871024594255872/831887443522224138/IMG_7311.JPG?width=436&height=582 We have a strong 121.775 mhz transmitter from...
by RJsaurus
Thu Apr 08, 2021 3:35 am
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

Here is a screen recording we took of what the DOA graph looks like when we drive the transmitter around it in a circle: https://youtu.be/mY7HhzyAsIQ I think I put in everything right and did the calibration right(with the antennas disconnected) and I even raised the spacing element to .25 instead o...
by RJsaurus
Sun Apr 04, 2021 4:59 pm
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

Crazy idea: non uniform circular array??? Like an oval?? That could give us some more space but not sure if it's feasible
by RJsaurus
Fri Apr 02, 2021 1:32 pm
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

Thanks we did calibrate with the antennas disconnected!

As for the spacing factor... yeah, we can't really afford for it to be much higher than 1.5 due to space constraints. Are there any other ways to account for multipath rather than just a larger array?
by RJsaurus
Thu Apr 01, 2021 2:53 am
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Re: Spotty Accuracy When Tracking Transmitter

Thank you so much @ckoval7! We're heading out in 12 hours with a larger array and what you told me in mind. I didn't look very closely at the DOA graph so I think that will help me a lot. Your description actually makes sense. I think I did calibration right, and our cables seem to be identical. So ...
by RJsaurus
Wed Mar 31, 2021 3:06 am
Forum: KerberosSDR
Topic: Spotty Accuracy When Tracking Transmitter
Replies: 12
Views: 2805

Spotty Accuracy When Tracking Transmitter

Hey forum! Just posting here about a project I'm working on for school and some issues I've been having. We have our Kerberos and Pi and everything correctly calibrated and set up(I'm pretty sure). But when we're stationary(and probably also moving) we can't get a stable DOA. I'm wondering if there'...