jks

Also from Europe try beginning at these times: 04Z 9800 RRI, 06Z 3955 BBC, 06Z 6040 RRI, 08Z 17790 BBC

See http://www.hfcc.org/drm Not all the signals listed there seem to be transmitting.

That way you can get in and set the Debian root password. Then ssh / putty login should work. I'll remove the hack on a subsequent release.

This is because for real-time GPS data this code needs to run PLL loop filter code at 1 kHz.

See Andrew's description here: http://www.aholme.co.uk/GPS/Main.htm

I don't think my simulation code is fast enough to do this in real-time. Anyway, the simulation code only simulates both the GPS FPGA logic (e.g. sdgps/a_ise/gps_iq15_1/demod.v) and the embedded processor together. It does not know how to work with the GPS logic running in the actual FPGA but the embedded processor simulated. But this embedded processor is quite simple and shouldn't be much of a problem to get working on the Zynq.

There is another problem to consider. My old "sdgps" project that you have running is targeted for a Spartan-6. But also for the Xilinx ISE toolchain. I believe Zynq requires the newer Vivado toolchain. So you will have to make some adjustment, e.g. instead of a .ucf format file for the FPGA pin mappings you will need a .xcf format file. And the definitions for the required Xilinx IP blocks is a little different. The GPS part of the newer KiwiSDR project targets the Artix-7 which of course requires Vivado. So you will find a .xcf file there and the Vivado-compatible IP block definitions.

After this is working there is the question of moving the C/C++ code off the Beagle into the Arm processor of the Zynq. But that is a separate consideration.

And now for something new: The "sdgps" project just outputs to the terminal as you know. And the GPS in the KiwiSDR project has this nice web interface as part of the admin page. What I've been working on the last few days is a version of the KiwiSDR project that has most of the "SDR" code removed. This will leave just the GPS code. There will be fewer files, it will compile much faster and be much easier to understand. The KiwiSDR project is currently at https://github.com/jks-prv/Beagle_SDR_GPS so I will make a new project called https://github.com/jks-prv/Beagle_GPS in a few days. I'm not sure if this will help you for using the Zedboard but I've had several requests for a version of the Kiwi for people who just want to do GPS development / experimentation and don't care about SDR.

I need to do a little more cleanup before releasing v1.139 with the new IQ mode. The changes are on the Kiwi at kiwisdr.sk3w.se:8073 if anyone wants to try it. I'd like to know if the Windows version of Dream works.

That reminds me that I've been meaning to create a "gallery" of waterfall / spectrum screen caps of common interference sources. Lots of situations have been identified now: BPL, xDSL, electric fences, different SMPSs, the Ethernet problem, ADC overload, ...

It might be ADSL or broadband-over-powerline (BPL). Note how the spectrum is obviously "notched" around the 30m, 20m, 17m and 15m ham bands (purple segments in band display). That's the service provider trying to keep hams happy, but failing dreadfully in this case. If you rotate the loop does the noise null at all?

I think it might also be several independent noise sources. I've seen those strong 0 - 30 MHz lines that look like static crashes before. I think they come from seriously defective switch mode power supplies.