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jks

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jks
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  • GPS: Galileo reception possible on Kiwi?

    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. shadowed by terrain or buildings). It certainly made a big difference at my NZ location. Since the Galileo E1 signal transmits on a frequency compatible with the Kiwi the question has been asked if it can also be received. It has worldwide reception and so would be very helpful.

    I think the majority of Kiwi owners struggle just to get the supplied antenna near a window, let alone outside and up high. Anything we can do to increase the percentage of Kiwis with functioning GPS would be very useful (e.g. more candidate Kiwis to participate in direction finding experiments). Plus they benefit from automatic, accurate frequency calibration of the SDR.

    I don't know much about HF-DF / triangulation, but fortunately we have a Kiwi user that does. He's already got it working! See: http://hcab14.blogspot.com

    KA7U
  • QZSS Support [GPS, added in v1.170]

    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 that are "shadowed" by buildings or terrain.

    If you're in the Asia/Oceania region a circle will be shown where the new geosynchronous QZS-3 sat should appear when it is transmitting (it seems to be off at the moment). Combined with the shadow map you should get an idea if QZS-3 will be receivable from your location. Because QZS-3 is geostationary its az/el position will not change. But of course the exact az/el depends on where the Kiwi is located.

    An alternate method to determine QZS-3 visibility: There are "dish pointing" apps on mobile devices that look through the device's camera while you point it at the sky. It then shows you a picture of what the camera sees, as usual, plus an overlay of the geosynchronous orbit belt with various longitude positions labeled. Just move the device until the cursor is over 127 deg E. If there is sky behind the cursor, and not an obstruction, then you'll probably be able to receive QZS-3.

    The image below shows the shadowing I get from the terrain to the west below about 20 degrees and buildings to the east and south. PRN195 (another QZSS sat) is passing through the QZS-3 circle, so I'll probably get reception when QZS-3 is back on.


    image
    fractional_n
  • QZSS Support [GPS, added in v1.170]

    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 sats in view (4) to compute location fixes.

    WA2ZKDfractional_n
  • QZSS Support [GPS, added in v1.170]

    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 display work correctly for them.

    WA2ZKD
  • Some things I have noticed [problems with a large DX/label database]

    Today's release, v1.168, has some improvements to the speed of dx labels during normal operation. Please let me know how the changes work for you. Problems during on-screen label editing are still being considered.

    G8JNJ