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jks

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jks
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  • The recent addition of the QZSS sats (Asia/Oceania reception only) increases the percentage of time enough sats are available for fixes (minimum 4 sats required). This is especially true for GPS antennas that don't have a full view of the sky (i.e. …
  • The problem in a picture. If you push a Galileo E1B signal through the Kiwi SE4150L front-end chip you really only get the bandwidth shown in green below with about 8dB loss (4 MHz). All sources say you really need the b/w shown in yellow at a minim…
  • But, experiments with this: https://github.com/jks-prv/GNSS-DSP-tools (thanks Peter Monta) are starting to say otherwise..
  • Okay, sorry about that. I got the Mac USB networking to work a long time ago, but haven't tried it recently.I have a little idea for this problem I'm going to try..
  • And just to double-check, using the current release I went through the procedure (on the network tab of the admin page) of switching from DHCP to a static ip and it worked fine. Be sure the netmask and gateway fields are set correctly. For a typical…
  • Also, did you _reboot_ the Beagle after the change? Not just restart the Kiwi server software. You get a blue "Beagle reboot" button in the network tab of the admin page after you press the confirmation button after making the change to a static add…
  • Well, okay. Hook up a USB cable from a pc to the BBG micro-USB. Follow the instructions below and then ssh/PuTTY over the USB using ip 192.168.7.2Once there take a look at the file /etc/network/interfaces, and compare to interfaces.bak, and see what…
  • Re-flash it from the supplied micro sd card.
  • Think I found my answer. From http://gps.aau.dk/fileadmin/gps/Dowloads/Papers/galileo_sig.pdf "The minimum bandwidth is generally twice the chipping rate for simple codes, while for BOC codes it is twice the sum of chipping rate and offset code rate…
  • Hi. That is an excellent question. If you look carefully at the free version of the DUC/DDC compiler provided with Vivado you'll see that it is not general purpose. It is targeted to the cell phone industry (LTE/CDMA) and does not have the bit width…
    in DDC on FPGA Comment by jks February 13
  • I also have not seen any problems including PRN193-5 in position fixes when they are in alert mode. But a few days ago when PRN199 was transmitting I noticed position fixes on your Kiwi often had altitude values that were very wrong. By thousands of…
  • In the bug/wish list (http://kiwisdr.com/bugs) there is an entry in the extension wish-list titled "milliHertz resolution FFTs" that refers to this exactly. It is best achieved on the Kiwi I think with a proper high-resolution FFT extension that ope…
    in Super Zoom? Comment by jks February 13
  • v1.172 adds a switch to the admin page GPS tab called "include alerted?" that overrides the exclusion of alerted sats from the position fix. The alert "A" symbol will appear green instead of red when the sat is actually being used. It will be intere…
  • GPS alert flag: There was a late change that went out after the initial v1.171 release. Most of you will have picked up the change. But if not, force an update by clicking the "build now" button on the update tab of the admin page. As shown below if…
  • Programming the Beagle devices and GPIO was always a pain in the early days when I was first developing. So I just accessed the hardware directly and tried to stay out of the way of the BB Debian software which was always changing. But it's probably…
  • To summarize the I2C situation: I2C0: Not available externally. Connects to PMIC, BB EEPROM, HDMI framer (BBB). Do not use obviously.I2C1: Can be configured to appear on header pins P9-17/18. DO NOT USE. Configured by Kiwi to be SPI0-CS0/MOSI used t…
  • Well, good I guess. But this bug is very upsetting to me. I have no way of reproducing it and don't know what the actual problem is. The workaround was discovered by a user just trying things at random. At this point the only long-term solution is t…
  • This issue is covered in detail in the instructions (http://kiwisdr.com/quickstart/index.html#id-power) But people don't read I guess.  We can't supply a cable because what type of connector would we put on the other end? Always USB-A? We don't want…
  • This sounds exactly like the cable voltage drop problem we have seen many times. The increased current draw of having the Kiwi board installed is causing excessive voltage drop on the cable from the power supply because the wire gauge is too small f…
  • Today's v1.171 update adds a shadow map to the GPS tab of the admin page. This is a display built up over a long period of time showing all az/el areas of reception colored in a transparent aqua color. That way you can see areas of non-reception tha…
  • I'll repeat the answer given previously in another thread: "We've had a report that with Firefox, going to Preferences > Privacy & Security > Site Data and then doing a Clear All Data has caused audio and waterfall glitches to disappear. I…
  • Are you talking about GPIO on KiwiSDR or BeagleBone Black/Green in general? If KiwiSDR see this thread, first page of comments. Look for my spreadsheet table with all the colors: http://valentfx.com/forums/#/discussion/590/kiwisdr-antenna-switch-ext…
  • To make sure this isn't a power supply issue, have you tried running without the Kiwi board attached and then seeing if a connection to the Beagle with ssh or a continuous ping is reliable?
  • I have recently moved to a new location where I have a limited view of the sky. Either blocked by other apartment buildings or a nearby (hopefully inactive) volcanic cone. The addition of the QZ sats really improves the amount of time I have enough …
  • Looks like PRN199 is being acquired now.
  • I tried to install JDK 8 onto the standard Debian 8.5 distro the Kiwi uses. It failed to install. Also, there was no package to install JDK 9. What I tried:pkuppks java | grep oracle oracle-java8-installer - Oracle Java(TM) Development Kit (JDK) 8 …
    in java on BBG Comment by jks February 8
  • I have not seen any acquisitions of PRN199 yet. There is some test code in the file Beagle_SDR_GPS/gps/search.cpp to make sure I got the PRN 193-202 initialization correct and the first 10 chips match what is written in the specification.
  • Okay, v1.170 is released with support for QZSS.
  • Well, that was easier than I thought. I'm tracking PRN 194 and 195 no problem from here in New Zealand (QZS-2 and -4 respectively). Subframes are decoding and the software is flagging them as good. I have a little work to do to make the az/el displa…
  • Yeah I've been looking at that. The section about the PRN code generation is ambiguous. What I've tried implementing so far hasn't worked. Update: got it now..