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Welcome to NavSpark Community, a friendly social site for NavSpark GPS/GNSS enthusiasts. If you have some related GPS/GNSS questions or interesting applications to share, this is the place to come !

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To download NavSpark Arduino IDE tools & documents, click Store/Resources, then RESOURCES

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1PPS Output signal as an accurate time Sync.

Hi, I have recently purchased 2 x  NS-T : PRECISION TIMING MODE GPS RECEIVER to evaluate the 1PPS output signal as an accurate time sync. option between 2 systems. When I power up both modules and compare the 1PPS o/p signal on a scope, they appear to be varying quite a bit, from 0nSec to over 600nSec. Is there anything I can do to improve the accuracy, some setup change ? I am using the GPS/GLONASS ACTIVE ANTENNA.

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1 Reply · Reply by Jason Lin on Tuesday

Question on Ephemeris Data Subframes of Binary NSRaw message

Dear NS community, I am currently having an issue with the navigation message provided by the NSRaw binary message documentation, specifically subframes 1 (sat clock and health data), 2 and 3(Ephemeris data) (message 0xB1). According to the documentation, subframes 1, 2 and 3 have 28bytes each (224 bits). The book "Fundamentals of Global Positioning Systems" by Tsui, p.91 (can be Googled) notes that these frames should hold 300 bits. Within the description of message 0xB1 it says: "which…

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1 Reply · Reply by ErikTUDelft Jun 24

Cannot get demo_how_to_extract_gps_info sketch to display gps data

Board: NavSpark-GL Sketch: demo_how_to_extract_gps_info ---- I have verified that the sketch is running on the NavSpark-GL board but the sketch is not displaying gps data. It appears that the function GnssInfo.isUpdated() always returns false. The GNSS Viewer application (version 2.0.129) will display my GPS location in less than two minutes. The NMEA messages generated by NavSpark-GL board are displayed and position of the GPS and GLONASS satellites are displayed on the map of the Earth. I…

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1 Reply · Reply by Kuo Hsu Jun 8

So I have been playing with the NS-RAW for several months....

... and still don't have cm accuracy. I use high-gain Tallysman 3040 antennas, multiple sats received, although NS-RAW only receives the GPSS sats (not GLONASS or Beidou)....and generally can get an OCCASIONAL "fix" solution with RTK, mostly float, and mostly "floating" (meaning they wander all over the place).  I have tried about every switch in RTKLib, without success, and am coming to the conclusion that cm-level accuracy is a nice dream, but not attainable. Anybody else have an idea?

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1 Reply · Reply by Jason Lin May 14

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Activity

james apple muncy replied to Ian Tester's discussion Bluefruit EZ-link + NS-RAW + Android
"I've hooked up my Navspark-GL to a HC-05 Bluetooth module just as you have done. Took me awhile to locate a descent app to use the NMEA data stream. I was beginning to think I was going to need to invent the wheel. https://play.google.com/store/apps…"
Friday
Oliver Huang commented on Oliver Huang's blog post FlexGPS : Flexible GPS Development Platform
"Realizing little chance customers will port open-source autopilot and RTK software to such hardware or write their own, we decided not to release such hardware development platform. Instead, a 25mm x 25mm RTK receiver module will be launched in Q4,…"
Wednesday
Ita G commented on Oliver Huang's blog post FlexGPS : Flexible GPS Development Platform
"Is this module still under active development? Is there any expected release date and/or pricing information?"
Wednesday
Ita G is now a member of NavSpark Community
Tuesday
Jason Lin replied to Connor O'Reilly's discussion 1PPS Output signal as an accurate time Sync.
"Testing by window side, using one active antenna and signal splitter feeding signal to two receivers, I get below result:



1PPS variation with respect to another is about 35nsec, ~ +/-16nsec.
If you are seeing 1PPS varying 0 ~ 600nsec, could it be…"
Tuesday
Connor O'Reilly posted a discussion
Hi,I have recently purchased 2 x  NS-T : PRECISION TIMING MODE GPS RECEIVER to evaluate the 1PPS output signal as an accurate time sync. option between 2 systems. When I power up both modules and compare the 1PPS o/p signal on a scope, they appear t…
Jun 29
Thijs is now a member of NavSpark Community
Jun 28
Blaz updated their profile
Jun 25
ErikTUDelft replied to ErikTUDelft's discussion Question on Ephemeris Data Subframes of Binary NSRaw message
"Update: message 0xE0 seems to be the one I was looking for! I'll be experimenting with it the coming days.
Best,
Erik,
Delft University of Technology"
Jun 24
ErikTUDelft posted a discussion
Dear NS community,I am currently having an issue with the navigation message provided by the NSRaw binary message documentation, specifically subframes 1 (sat clock and health data), 2 and 3(Ephemeris data) (message 0xB1). According to the documenta…
Jun 22
Cash Olsen and Craig Farless joined NavSpark Community
Jun 21
Jason Lin replied to Ingmar Guillaume's discussion Supporting Arduino 1.6.x through user hardware and tools directories
"Thank you Ingmar and Edwin for letting me know it works OK. Hope with Windows port experience, Linux port could be done faster. After both done, would contact Arduino team about it."
Jun 21
Edwin Wisse replied to Ingmar Guillaume's discussion Supporting Arduino 1.6.x through user hardware and tools directories
"Installation of the navspark files was pretty easy.
Just compiled a sketch on the standard arduino 1.6.5 editor. Works great on windows. I can test on Linux too later.
Jason, many thanks for your efforts!"
Jun 21
Oliver Huang posted a blog post
Useful tool for checking number of satellites available with different satellite navigation systems: http://www.taroz.net/GNSS-Radar.html
Example use: http://diydrones.com/profiles/blogs/single-frequency-rtk-receiver-f...
Jun 20
Jason Lin replied to Dom's discussion Lower power usage?
"Thank you Io Mihai for this interesting information. I think Adapter Board charge longer time yet battery operate shorter time is due to D1 voltage drop from NavSpark board, and D2 voltage drop from Adapter board, before 5V goes to SC806 charger IC.…"
Jun 19
Io Mihai liked Dom's discussion Lower power usage?
Jun 19
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