# Latest **URL:** https://learn.safran-navigation-timing.com/latest.md [Latest](https://learn.safran-navigation-timing.com/latest.md) · [Categories](https://learn.safran-navigation-timing.com/categories.md) --- ## [Automated connection of GNSS receiver from API (not manual action)](https://learn.safran-navigation-timing.com/t/automated-connection-of-gnss-receiver-from-api-not-manual-action/580)
**Author:** [@MrT](https://learn.safran-navigation-timing.com/u/MrT)\ **Replies:** 3\ **Last updated:** [May 7, 2026, 12:10am UTC](https://learn.safran-navigation-timing.com/t/automated-connection-of-gnss-receiver-from-api-not-manual-action/580 "2026-05-07T00:10:20Z")
Hi there, First of all I would like to say hello to the community. This is my first post at the forum of happy and motivated users of Skydel / GSG-8. I must admit that philosophy of full (almost) automation that stand… --- ## [Launching Skydel Headless via SSH only will fail without Window Login First](https://learn.safran-navigation-timing.com/t/launching-skydel-headless-via-ssh-only-will-fail-without-window-login-first/1341)
**Author:** [@dcraig](https://learn.safran-navigation-timing.com/u/dcraig)\ **Replies:** 2\ **Last updated:** [May 6, 2026, 1:00pm UTC](https://learn.safran-navigation-timing.com/t/launching-skydel-headless-via-ssh-only-will-fail-without-window-login-first/1341 "2026-05-06T13:00:59Z")
Scenario: Automated testing suite via Labview issues commands to Headless Broadsim via API Python scripts. The issue(s), 1. Without skydel already running no API commands can be executed. 2.To attempt to resolve, ssh… --- ## [Creating LEO constellation on Skydel issues](https://learn.safran-navigation-timing.com/t/creating-leo-constellation-on-skydel-issues/1305)
**Author:** [@ayyadak](https://learn.safran-navigation-timing.com/u/ayyadak)\ **Replies:** 2\ **Last updated:** [February 26, 2026, 12:51pm UTC](https://learn.safran-navigation-timing.com/t/creating-leo-constellation-on-skydel-issues/1305 "2026-02-26T12:51:28Z")
Hi everyone!! I have few questions about Skydel for LEO constellation, please… I would be happy if you can help!! Thanks!! Question 1: TLE Import Error in Skydel I am trying to create a LEO orbit by modifying a Galileo… --- ## [X300 and UB-X160 problem](https://learn.safran-navigation-timing.com/t/x300-and-ub-x160-problem/1333)
**Author:** [@jnunez](https://learn.safran-navigation-timing.com/u/jnunez)\ **Replies:** 3\ **Last updated:** [December 18, 2025, 4:02pm UTC](https://learn.safran-navigation-timing.com/t/x300-and-ub-x160-problem/1333 "2025-12-18T16:02:51Z")
I am using Skydel 24.12.1 and USRP X310 with an UBX-160 daughterboard to generate my first L1C/A GPS signal. In the output settings, I add an X310, adjust the default parameters in RF-A, and start the simulation. The log… --- ## [Time Synchronization issue between Skydel main instance and Spoofer instance](https://learn.safran-navigation-timing.com/t/time-synchronization-issue-between-skydel-main-instance-and-spoofer-instance/1329)
**Author:** [@uxinz](https://learn.safran-navigation-timing.com/u/uxinz)\ **Replies:** 2\ **Last updated:** [September 19, 2025, 9:01am UTC](https://learn.safran-navigation-timing.com/t/time-synchronization-issue-between-skydel-main-instance-and-spoofer-instance/1329 "2025-09-19T09:01:12Z")
Hi Support Team, I’m having trouble launching my Spoofer instance in exact sync with the Main Skydel instance. What I’m seeing When I click Start on the Main instance, the Spoofer does start automatically, but 1–2 s… --- ## [Skydel Simulation and Receiver time difference](https://learn.safran-navigation-timing.com/t/skydel-simulation-and-receiver-time-difference/1327)
**Author:** [@JasonG\_SFS](https://learn.safran-navigation-timing.com/u/JasonG_SFS)\ **Replies:** 4\ **Last updated:** [August 27, 2025, 10:15am UTC](https://learn.safran-navigation-timing.com/t/skydel-simulation-and-receiver-time-difference/1327 "2025-08-27T10:15:32Z")
Hi! Would you please help us understand why there is a 10-20 second delay in GPS time between Simulation and Receiver? This occurs when Start time is set to Current Computer Time. Screenshot below from testing. --- ## [Recording IQ signals through SKYDEL](https://learn.safran-navigation-timing.com/t/recording-iq-signals-through-skydel/1319)
**Author:** [@Zaynab](https://learn.safran-navigation-timing.com/u/Zaynab)\ **Replies:** 1\ **Last updated:** [August 12, 2025, 1:38pm UTC](https://learn.safran-navigation-timing.com/t/recording-iq-signals-through-skydel/1319 "2025-08-12T13:38:59Z")
Hello, I’m interested in a feature for recording real IQ data using Skydel. Specifically, I would like to connect an active antenna (via a Bias Tee) to a USRP in order to capture and record live IQ data. Does Skydel s… --- ## [Trajectory offset when importing kml file into Skydel](https://learn.safran-navigation-timing.com/t/trajectory-offset-when-importing-kml-file-into-skydel/1310)
**Author:** [@Gianluca](https://learn.safran-navigation-timing.com/u/Gianluca)\ **Replies:** 1\ **Last updated:** [June 6, 2025, 7:17pm UTC](https://learn.safran-navigation-timing.com/t/trajectory-offset-when-importing-kml-file-into-skydel/1310 "2025-06-06T19:17:44Z")
Hi everyone, I created a trajectory using an online tool and saved it as a KML file. When I visualize the KML online by using another site, the trajectory looks fine and follows the street exactly as expected. But when… --- ## [Skydel simulator latecy spikes](https://learn.safran-navigation-timing.com/t/skydel-simulator-latecy-spikes/1312)
**Author:** [@scaliari](https://learn.safran-navigation-timing.com/u/scaliari)\ **Replies:** 1\ **Last updated:** [June 6, 2025, 7:16pm UTC](https://learn.safran-navigation-timing.com/t/skydel-simulator-latecy-spikes/1312 "2025-06-06T19:16:22Z")
:triangular\_flag: Problem Occasional latency spikes cause a “streaming underflow” fatal error that stops the simulation. image|690x173, 100% All spikes are periodic: image|690x153 (I have performace.csv but I can… --- ## [Add to NMEA GSV logging all satellites in simulation, not just GPS, GLO, GAL](https://learn.safran-navigation-timing.com/t/add-to-nmea-gsv-logging-all-satellites-in-simulation-not-just-gps-glo-gal/1303)
**Author:** [@kchereshnev](https://learn.safran-navigation-timing.com/u/kchereshnev)\ **Replies:** 0\ **Last updated:** [March 12, 2025, 2:13pm UTC](https://learn.safran-navigation-timing.com/t/add-to-nmea-gsv-logging-all-satellites-in-simulation-not-just-gps-glo-gal/1303 "2025-03-12T14:13:48Z")
on my Skydel with version 24.12.1 i have enabled NMEA data logging scenario contains following constellations in simulation: GPS, GLONASS, GALILEO, BEIDOU, SBAS, QZSS Issue: logged NMEA GSV contains data only ab… --- ## [Skydel Fundamentals Course Broken](https://learn.safran-navigation-timing.com/t/skydel-fundamentals-course-broken/1301)
**Author:** [@ragraham](https://learn.safran-navigation-timing.com/u/ragraham)\ **Replies:** 3\ **Last updated:** [January 24, 2025, 7:03pm UTC](https://learn.safran-navigation-timing.com/t/skydel-fundamentals-course-broken/1301 "2025-01-24T19:03:19Z")
I am unable to take the courses. The modules are out of order. --- ## [The Impact of the Turning Process on Vehicle Speed and Positioning Accuracy in GNSS Simulation](https://learn.safran-navigation-timing.com/t/the-impact-of-the-turning-process-on-vehicle-speed-and-positioning-accuracy-in-gnss-simulation/1299)
**Author:** [@Akio](https://learn.safran-navigation-timing.com/u/Akio)\ **Replies:** 0\ **Last updated:** [January 22, 2025, 8:25am UTC](https://learn.safran-navigation-timing.com/t/the-impact-of-the-turning-process-on-vehicle-speed-and-positioning-accuracy-in-gnss-simulation/1299 "2025-01-22T08:25:28Z")
Hello Safran Experts， I have a question and I hope to hear your insights. When I simulate a device traveling at an uniform speed in Skydel, I’ve noticed that during a turning process, the speed captured by the receiver… --- ## [Display currently used nmea file in Track Playback trajectory](https://learn.safran-navigation-timing.com/t/display-currently-used-nmea-file-in-track-playback-trajectory/1297)
**Author:** [@kchereshnev](https://learn.safran-navigation-timing.com/u/kchereshnev)\ **Replies:** 1\ **Last updated:** [January 21, 2025, 8:01pm UTC](https://learn.safran-navigation-timing.com/t/display-currently-used-nmea-file-in-track-playback-trajectory/1297 "2025-01-21T20:01:47Z")
it would be very useful to show curently used NMEA file in Vehicle - Trajectory - Track Playback option. user may have several nmea file and would like to know which of them was used for current scenario. on Skydel ver… --- ## [How to process the IQ samples from Skydel GNSS simulator?](https://learn.safran-navigation-timing.com/t/how-to-process-the-iq-samples-from-skydel-gnss-simulator/1296)
**Author:** [@hongzhaozheng](https://learn.safran-navigation-timing.com/u/hongzhaozheng)\ **Replies:** 1\ **Last updated:** [January 17, 2025, 1:12pm UTC](https://learn.safran-navigation-timing.com/t/how-to-process-the-iq-samples-from-skydel-gnss-simulator/1296 "2025-01-17T13:12:23Z")
I am currently working on the post processing of the IQ data generated from the Skydel GNSS simulator. The work involves GPS satellites (L1C/A) where all SV ID are present. Both RF and C/A are enabled in the signal. In a… --- ## [How to determine the f\_IF from .xml file?](https://learn.safran-navigation-timing.com/t/how-to-determine-the-f-if-from-xml-file/1295)
**Author:** [@hongzhaozheng](https://learn.safran-navigation-timing.com/u/hongzhaozheng)\ **Replies:** 2\ **Last updated:** [January 14, 2025, 4:17pm UTC](https://learn.safran-navigation-timing.com/t/how-to-determine-the-f-if-from-xml-file/1295 "2025-01-14T16:17:14Z")
Hi, I am doing post-processing on the IQ files generated from Skydel by choosing File as the output type. It involves satellites. I know how to read the center frequency, sampling rate from the .xml file, but I am not s… --- ## [Skydel update](https://learn.safran-navigation-timing.com/t/skydel-update/1154)
**Author:** [@emlopez](https://learn.safran-navigation-timing.com/u/emlopez)\ **Replies:** 5\ **Last updated:** [December 19, 2024, 9:39pm UTC](https://learn.safran-navigation-timing.com/t/skydel-update/1154 "2024-12-19T21:39:38Z")
Hi, Our team has a Skydel academic license (former OAPP program). If we update Skydel to its latest version, will the license stop working? Thanks. --- ## [Noise seed](https://learn.safran-navigation-timing.com/t/noise-seed/1290)
**Author:** [@BravoLima](https://learn.safran-navigation-timing.com/u/BravoLima)\ **Replies:** 0\ **Last updated:** [December 17, 2024, 12:14pm UTC](https://learn.safran-navigation-timing.com/t/noise-seed/1290 "2024-12-17T12:14:24Z")
Is there a way to change the seed of the generated noise? I need to simulate the same signals, but with different noise realizations. I looked over the settings and could not find anything related with the noise generat… --- ## [Where new multipath models are located?](https://learn.safran-navigation-timing.com/t/where-new-multipath-models-are-located/1288)
**Author:** [@kchereshnev](https://learn.safran-navigation-timing.com/u/kchereshnev)\ **Replies:** 2\ **Last updated:** [December 16, 2024, 1:09pm UTC](https://learn.safran-navigation-timing.com/t/where-new-multipath-models-are-located/1288 "2024-12-16T13:09:58Z")
Hi all, in 24.9.0 release noted is is stated that: Rural, Suburban and Urban multipath propagation model environments have been integrated into the GUI. i have 24.9.0 but see only old multipath models: where i ca… --- ## [New Skydel Support Packages](https://learn.safran-navigation-timing.com/t/new-skydel-support-packages/1287)
**Author:** [@A-D](https://learn.safran-navigation-timing.com/u/A-D)\ **Replies:** 0\ **Last updated:** [December 10, 2024, 1:33pm UTC](https://learn.safran-navigation-timing.com/t/new-skydel-support-packages/1287 "2024-12-10T13:33:11Z")
Skydel users that wish to take advantage of the latest software updates (up to four per year!) need to be in their support period in order to take advantage of the newest version. Within one year of a Skydel license pu… --- ## [Trajectory in GSG7](https://learn.safran-navigation-timing.com/t/trajectory-in-gsg7/1280)
**Author:** [@mac21](https://learn.safran-navigation-timing.com/u/mac21)\ **Replies:** 0\ **Last updated:** [November 15, 2024, 12:47pm UTC](https://learn.safran-navigation-timing.com/t/trajectory-in-gsg7/1280 "2024-11-15T12:47:21Z")
I am currenly using GSG7.Is there a way to create an own trajectory which is oval in shape instead of using built in feature such as Circle. … --- ## [Synchronize Ettus X310 SDR with Live-Sky](https://learn.safran-navigation-timing.com/t/synchronize-ettus-x310-sdr-with-live-sky/1187)
**Author:** [@grote](https://learn.safran-navigation-timing.com/u/grote)\ **Replies:** 11\ **Last updated:** [October 10, 2024, 1:32pm UTC](https://learn.safran-navigation-timing.com/t/synchronize-ettus-x310-sdr-with-live-sky/1187 "2024-10-10T13:32:33Z")
Hello, We have built our own Skydel simulator that is paired with an Ettus X310 SDR running Skydel 23.8.0. We wish to perform simulations that are synchronized to the Live-Sky GNSS signals overhead but are unsure about … --- ## [Setting up fixed](https://learn.safran-navigation-timing.com/t/setting-up-fixed/1273)
**Author:** [@sschleic](https://learn.safran-navigation-timing.com/u/sschleic)\ **Replies:** 1\ **Last updated:** [October 8, 2024, 11:53am UTC](https://learn.safran-navigation-timing.com/t/setting-up-fixed/1273 "2024-10-08T11:53:50Z")
Hey there, I would like to follow Option2 mentioned here https://safran-navigation-timing.com/document/configure-satellite-positions-based-on-user-defined-elevation-azimuth-in-skydel/ Where do I find the mentioned mai… --- ## [Errors when using USRP to realize RTK function](https://learn.safran-navigation-timing.com/t/errors-when-using-usrp-to-realize-rtk-function/1264)
**Author:** [@Akio](https://learn.safran-navigation-timing.com/u/Akio)\ **Replies:** 5\ **Last updated:** [September 27, 2024, 1:23am UTC](https://learn.safran-navigation-timing.com/t/errors-when-using-usrp-to-realize-rtk-function/1264 "2024-09-27T01:23:23Z")
Hello，Safran engineers, I have a question I would like to confirm with you. I am trying to implement RTK using a USRP 2954R, where the USRP generates the RF signal, and the other instance is NoneRT, and the RTCM plugin … --- ## [Suggest a way to loop scenario](https://learn.safran-navigation-timing.com/t/suggest-a-way-to-loop-scenario/1268)
**Author:** [@kchereshnev](https://learn.safran-navigation-timing.com/u/kchereshnev)\ **Replies:** 1\ **Last updated:** [September 25, 2024, 1:18pm UTC](https://learn.safran-navigation-timing.com/t/suggest-a-way-to-loop-scenario/1268 "2024-09-25T13:18:47Z")
Dear Skydel community, could someone suggest a way how i can run scenario “test.sdx” in a loop, for example to restart it every 1 hour haven’t found it in GUI. maybe there is a simple python script to do it? --- ## [Uncontinuous time interval between positions](https://learn.safran-navigation-timing.com/t/uncontinuous-time-interval-between-positions/1267)
**Author:** [@jmfoley](https://learn.safran-navigation-timing.com/u/jmfoley)\ **Replies:** 0\ **Last updated:** [September 18, 2024, 11:10pm UTC](https://learn.safran-navigation-timing.com/t/uncontinuous-time-interval-between-positions/1267 "2024-09-18T23:10:12Z")
When using the Skydel software to import a trajectory via a .csv file, I get the following error when using 5Hz updates in the .csv trajectory file: “Uncontinuous time interval between positions. This may cause unexpect… --- ## [IQ streaming](https://learn.safran-navigation-timing.com/t/iq-streaming/1261)
**Author:** [@davidmcleod](https://learn.safran-navigation-timing.com/u/davidmcleod)\ **Replies:** 1\ **Last updated:** [August 21, 2024, 12:50pm UTC](https://learn.safran-navigation-timing.com/t/iq-streaming/1261 "2024-08-21T12:50:57Z")
Is it possible to stream IQ to an external device in real-time? if so what are the rates and the interface? Also, for saving simulation data to a file option SKY-IQFILE is needed, what is the price of this licence rough… --- ## [Configuring Doppler Shift in GSG8 GPS Spoofing Simulation](https://learn.safran-navigation-timing.com/t/configuring-doppler-shift-in-gsg8-gps-spoofing-simulation/1255)
**Author:** [@NPare](https://learn.safran-navigation-timing.com/u/NPare)\ **Replies:** 4\ **Last updated:** [August 8, 2024, 5:40pm UTC](https://learn.safran-navigation-timing.com/t/configuring-doppler-shift-in-gsg8-gps-spoofing-simulation/1255 "2024-08-08T17:40:45Z")
Hello everyone, I’m working on a GPS spoofing simulation using the GSG8 simulator and need some advice on its capabilities. Specifically, I’m interested in whether it’s possible to configure the simulator to generate sp… --- ## [NavIC L1 and S IQ data](https://learn.safran-navigation-timing.com/t/navic-l1-and-s-iq-data/1258)
**Author:** [@Srinu](https://learn.safran-navigation-timing.com/u/Srinu)\ **Replies:** 1\ **Last updated:** [August 5, 2024, 1:14pm UTC](https://learn.safran-navigation-timing.com/t/navic-l1-and-s-iq-data/1258 "2024-08-05T13:14:49Z")
Can I get the IQ data of NavIC L1 and S bands? NavIC L1 and S-band of signals are disabled in the signal selection window of newer version 24.6. Thanks --- ## [Huge difference in C1C, C1L, and C2L](https://learn.safran-navigation-timing.com/t/huge-difference-in-c1c-c1l-and-c2l/1246)
**Author:** [@NischalPI](https://learn.safran-navigation-timing.com/u/NischalPI)\ **Replies:** 1\ **Last updated:** [July 31, 2024, 7:02pm UTC](https://learn.safran-navigation-timing.com/t/huge-difference-in-c1c-c1l-and-c2l/1246 "2024-07-31T19:02:37Z")
Hey, I was simulationg a fixed reciever on Skydel and I converted the logs file to RINEX using skydel tools to further analyze the data. I observed that there was huge difference between pseudorange observable from diffe… --- ## [Calculating Power](https://learn.safran-navigation-timing.com/t/calculating-power/1249)
**Author:** [@mallory.flynn](https://learn.safran-navigation-timing.com/u/mallory.flynn)\ **Replies:** 0\ **Last updated:** [June 25, 2024, 5:25pm UTC](https://learn.safran-navigation-timing.com/t/calculating-power/1249 "2024-06-25T17:25:21Z")
Hello Skydel! I am trying to calculate the satellite power from log data and cannot seem to connect the dots with the math. The transmitter (satellite) power should be around 14dBW (for GPS L1CA) but I seem to get diffe… [Next page](https://learn.safran-navigation-timing.com/latest.md?page=1)