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Weird results (PRN127 is really GAGAN?)
Nothing special,just posting some strange acquisition results I've been achieving in Nottingham (UK). How can it be that GAGAN signal (PRN127) was stronger than EGNOS?Figure 1: INMARSAT 4-F1 (PRN127)...
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It says so...
Today I convolutional decoded the messages sent by PRN127.Then I used the SBAS teacher to interprete the result and, well, you can see the message 9 yourself.Fig. 1: "SBAS teacher" (contribute of ESA)...
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GIOVE-B
How to acquire GIOVE-B?- Take out your favorite GNSS data grabber from the drawer.- Collect some signal when GIOVE-B is up in the sky (a simple patch antenna does the job).- Perform a fine frequency...
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New signal samplers
Hello,It's been a long time since I posted something... I have been busy with some hardware development.But in my Company we finally have some new data grabber prototypes for our software receiver (and...
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Did I mention that...
Hello,did I mention that with the CPLD version of the dongle we can receive Beidou-M1, the first satellite of the Chinese global navigation system?The bird transmits a BPSK(2) on a 1561.098 MHz...
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An interesting signal modulation
With GIOVE-B, the second satellite of the IOV Galileo constellation, a new modulation is being experimented, the CBOC(6,1,1/11).With the CPLD version of NSL dongle and a bit of software, I did get the...
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Ticking the last box: Glonass L1
Hello!We had to wait long enough for some RF filters. Half a hour after receiving them, the Maxim MAX2769 which is fitted on our NSL USB dongle tuned correctly on Glonass frequency. I had to quickly...
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Still alive and working hard
Hi,despite not writing anything in here, I have been working on a new version of the dongle and on many other things.First, I'm now in hardware design: look at the new signal samplers, my personal joy...
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Opening the door to new signals
Well,I don't manage to keep my promise of updating regularly this blog (blush). Anyway, I am improving little by little so another pretty stable thing is a board which I use to capture the new civil...
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Galileo E5AltBOC tracking in slow motion
Hello everyone,not grabbed with our "TUNE" boards (the plot would not be as detailed at 61.44Msps) but with our next one I did not write about yet (samples at about 440Msps), here is a basic E5AltBOC...
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Linking PRIMO with gps-sdr
Hello,just finished adapting the open-source project www.gps-sdr.com to use PRIMO. On our Ubuntu Karmic 32bit laptop runs nicely but still uses a lot of resources (especially the GUI). The effect is...
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Snapshot post-processing with PRIMO
Hi,Today I'd like to show what Ben, Luis, and me have been doing in our spare time and sometimes sacrifying our precious weekend hours.Internal codename RETROFIX, it's a service running on one of our...
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Ladies and gentlemen, our "Wave"
Hi,This is a special post for me, there is just so much work behind it that I feel literally relieved :)Figure 1: Wave GNSS front-end.Luis and me went through a quantity of problems, but eventually...
View ArticleOpen source Software Defined Radio GPS receiver
Hello,Just a quick update to the people who are involved on gps-sdr.Here is a version that (as far as I am aware) compiles on Ubuntu Lucid (32 and 64 bits).And if you don't have any of NSL's GNSS data...
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A new adventure in GNSS
Hi,I am afraid nothing has happened on my GNSS blog for too long now, so I guess I should give some really big news this time ;)Well, I would love to write about my latest GNSS creation... but I am not...
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Skytraq s1315f-raw (under the magnifying lens)
Hi,Lately I have been working with one of the few mass market receivers which outputs raw observables: the Skytraq S1315F-RAW. The only other "low cost" alternative to it is the uBlox LEA-4T, LEA-5T,...
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The benefit of Glonass?
Another study I am carrying out is how much benefit the availability of Glonass satellites really brings. Low-cost dual constellation GPS-Glonass standalone receiver are starting to show up in the...
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Is SiRF really bringing back carrier phase?
Lately I have been witnessing people reporting about getting carrier phase from various SiRF GSD4e receivers, such as Navman and OriginGPS. There is a moltitude of SiRF IV receivers out there, and the...
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NVS08C-CSM, the first mass market receiver to track Galileo
I would like to report the great work done by NVS which -to my knowledge- is the first Company to produce a mass market single frequency four constellation receiver tracking Galileo.Figure 1: NVS...
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Processing Galileo
The first prototype of SdrNav20 is working these days to receive the Galileo signal in space.Figure 1: First SdrNav20 assembled prototype.Using a simple patch antenna, the first acquisition done using...
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