# Skydel Discussion **URL:** https://learn.safran-navigation-timing.com/c/skydel-discussion/6.md?page=2 [Latest](https://learn.safran-navigation-timing.com/latest.md) · [Categories](https://learn.safran-navigation-timing.com/categories.md) **Page:** 3 --- ## [Bit Offset on Galileo Message Modifications](https://learn.safran-navigation-timing.com/t/bit-offset-on-galileo-message-modifications/971)
**Author:** [@mallory.flynn](https://learn.safran-navigation-timing.com/u/mallory.flynn)\ **Replies:** 3\ **Last updated:** [December 21, 2022, 7:28pm UTC](https://learn.safran-navigation-timing.com/t/bit-offset-on-galileo-message-modifications/971 "2022-12-21T19:28:27Z")
While trying change the week number on Galileo independently from Skydel, I found that the bit index was off by 3. I was only able to change the week number when I included the offset. I know one of the bits can be accou… --- ## [Vehicle simulation - Tumbling motion in API](https://learn.safran-navigation-timing.com/t/vehicle-simulation-tumbling-motion-in-api/970)
**Author:** [@mallory.flynn](https://learn.safran-navigation-timing.com/u/mallory.flynn)\ **Replies:** 1\ **Last updated:** [December 19, 2022, 9:17pm UTC](https://learn.safran-navigation-timing.com/t/vehicle-simulation-tumbling-motion-in-api/970 "2022-12-19T21:17:38Z")
I am trying to create a tumbling motion for my vehicle. It looks like there are two ways of achieving the motion, through adjusting the trajectory or using antenna sequencing. The issue is the scenario we have is 2 hours… --- ## [Effect of different terrains and city layout on Jamming signal](https://learn.safran-navigation-timing.com/t/effect-of-different-terrains-and-city-layout-on-jamming-signal/961)
**Author:** [@Ahmedaa](https://learn.safran-navigation-timing.com/u/Ahmedaa)\ **Replies:** 2\ **Last updated:** [December 16, 2022, 12:18pm UTC](https://learn.safran-navigation-timing.com/t/effect-of-different-terrains-and-city-layout-on-jamming-signal/961 "2022-12-16T12:18:45Z")
Hi, While creating dynamic jamming scenario, I found that the jamming signal path loss (observed at the receiver) does not change based on different map layout (i.e., built up city or open area). My question is if it i… --- ## [Issue with PTP synchronizing and Skydel Simulator](https://learn.safran-navigation-timing.com/t/issue-with-ptp-synchronizing-and-skydel-simulator/881)
**Author:** [@Baifo](https://learn.safran-navigation-timing.com/u/Baifo)\ **Replies:** 11\ **Last updated:** [November 25, 2022, 4:20pm UTC](https://learn.safran-navigation-timing.com/t/issue-with-ptp-synchronizing-and-skydel-simulator/881 "2022-11-25T16:20:32Z")
Dear Orolia/Skydel team/community, We have found a issue/bug in our simulation, related to the simulation time vs. computer time synchronized with PTP The Orolia PC GSG-8 has been synchronized with a PTP eth card. … --- ## [Problems with booting the system](https://learn.safran-navigation-timing.com/t/problems-with-booting-the-system/939)
**Author:** [@Ahmedaa](https://learn.safran-navigation-timing.com/u/Ahmedaa)\ **Replies:** 1\ **Last updated:** [November 24, 2022, 9:09pm UTC](https://learn.safran-navigation-timing.com/t/problems-with-booting-the-system/939 "2022-11-24T21:09:52Z")
Hi, But, we are having a problem when trying to boot the GSG-8 simulator. Basically, the system cannot boot properly and there is a black screen which shows repeatedly. Please find a screenshot of it below. Best wis… --- ## [SBAS Corrections](https://learn.safran-navigation-timing.com/t/sbas-corrections/926)
**Author:** [@Joshua.Prentice](https://learn.safran-navigation-timing.com/u/Joshua.Prentice)\ **Replies:** 1\ **Last updated:** [November 18, 2022, 4:59pm UTC](https://learn.safran-navigation-timing.com/t/sbas-corrections/926 "2022-11-18T16:59:22Z")
How is SBAS implemented in Skydel? A customer is running tests with and without SBAS and reported seeing very little difference in accuracy with SBAS turned off versus on. I attempted to recreate their scenario (using a … --- ## [Radiating GNSS Signals](https://learn.safran-navigation-timing.com/t/radiating-gnss-signals/712)
**Author:** [@mventresca](https://learn.safran-navigation-timing.com/u/mventresca)\ **Replies:** 1\ **Last updated:** [June 28, 2022, 10:45am UTC](https://learn.safran-navigation-timing.com/t/radiating-gnss-signals/712 "2022-06-28T10:45:51Z")
What guidance can Orolia provide for radiating GNSS signals into the air? Is an isolation chamber always required or are there acceptable power levels and transmitter/receiver distances that will not cause interference … --- ## [Finding C/N0](https://learn.safran-navigation-timing.com/t/finding-c-n0/827)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 2\ **Last updated:** [November 8, 2022, 1:55pm UTC](https://learn.safran-navigation-timing.com/t/finding-c-n0/827 "2022-11-08T13:55:17Z")
Does Skydel calculate the C/N0 directly? if not, does it help me to calculate it (estimate losses, gains, powers. etc.)? --- ## [Interferer on aircraft](https://learn.safran-navigation-timing.com/t/interferer-on-aircraft/919)
**Author:** [@kammis](https://learn.safran-navigation-timing.com/u/kammis)\ **Replies:** 1\ **Last updated:** [November 7, 2022, 8:02pm UTC](https://learn.safran-navigation-timing.com/t/interferer-on-aircraft/919 "2022-11-07T20:02:40Z")
I am trying to test an interferer (jammer and/or spoofer) with a 3D track that is onboard an aircraft. I noticed that although I can input the 3D position, the track input box only allows 2D. Is the interferer following … --- ## [Error: an illegal memory access was encountered When Importing Custom Signal](https://learn.safran-navigation-timing.com/t/error-an-illegal-memory-access-was-encountered-when-importing-custom-signal/911)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 1\ **Last updated:** [November 3, 2022, 2:40pm UTC](https://learn.safran-navigation-timing.com/t/error-an-illegal-memory-access-was-encountered-when-importing-custom-signal/911 "2022-11-03T14:40:18Z")
I’m trying to use the custom signal feature, testing a simple GPS code that was given by Orolia, that used to work fine in older version of skydel. My current version is 22.7.1. The xml file import fine, and I get all th… --- ## [Error when editing the orbital parameters of BeiDou constellation](https://learn.safran-navigation-timing.com/t/error-when-editing-the-orbital-parameters-of-beidou-constellation/898)
**Author:** [@Maria\_Mohamad](https://learn.safran-navigation-timing.com/u/Maria_Mohamad)\ **Replies:** 3\ **Last updated:** [October 31, 2022, 9:38pm UTC](https://learn.safran-navigation-timing.com/t/error-when-editing-the-orbital-parameters-of-beidou-constellation/898 "2022-10-31T21:38:04Z")
Hi there, I’m facing an error when I edit the orbital parameters of BeiDou satellites. The error is: No i0 value for BeiDou Reserved Satellite type. I’m not sure how to solve this issue, and I would appreciate your assi… --- ## [Logging C/N](https://learn.safran-navigation-timing.com/t/logging-c-n/896)
**Author:** [@kammis](https://learn.safran-navigation-timing.com/u/kammis)\ **Replies:** 2\ **Last updated:** [October 27, 2022, 4:19pm UTC](https://learn.safran-navigation-timing.com/t/logging-c-n/896 "2022-10-27T16:19:40Z")
I’m running a simulation with a dynamic interferer and spoofer. I’d like to log the C/N that appears under the constellations tab, but I’m not sure how. It would also be nice to print to the screen at various times in th… --- ## [Error (Error) Navigation message wasn't updated for elapsed ms: 211000](https://learn.safran-navigation-timing.com/t/error-error-navigation-message-wasnt-updated-for-elapsed-ms-211000/882)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 5\ **Last updated:** [October 26, 2022, 5:38pm UTC](https://learn.safran-navigation-timing.com/t/error-error-navigation-message-wasnt-updated-for-elapsed-ms-211000/882 "2022-10-26T17:38:24Z")
I’m doing a LEO Galileo scenario that was working well until I updated skydel to 22.7.1, now after 3 minutes of the simulation, I get the following error: Error (Error) Navigation message wasn’t updated for elapsed ms:… --- ## [GNSS reflectometry scenario creation](https://learn.safran-navigation-timing.com/t/gnss-reflectometry-scenario-creation/402)
**Author:** [@phule](https://learn.safran-navigation-timing.com/u/phule)\ **Replies:** 12\ **Last updated:** [October 24, 2022, 7:45pm UTC](https://learn.safran-navigation-timing.com/t/gnss-reflectometry-scenario-creation/402 "2022-10-24T19:45:27Z")
Hi, We are trying to using Skydel software and USRP N310 to simulate the GNSS reflectometry scenarios. It means that two antennas are mounted on the Vehicle. Antenna 1 will face up to receive the GNSS Light of Sight s… --- ## [Error when relocating Galileo and BeiDou to LEO](https://learn.safran-navigation-timing.com/t/error-when-relocating-galileo-and-beidou-to-leo/858)
**Author:** [@Maria\_Mohamad](https://learn.safran-navigation-timing.com/u/Maria_Mohamad)\ **Replies:** 7\ **Last updated:** [October 21, 2022, 7:42pm UTC](https://learn.safran-navigation-timing.com/t/error-when-relocating-galileo-and-beidou-to-leo/858 "2022-10-21T19:42:54Z")
Hi there, I’m facing a Streaming Buffer underrun error when I put both Galileo and BeiDou constellations to LEO. I tested the GPU and it scored 2.79, which is good. Please find screenshots of the error. Kindly advis… --- ## [Can I use custom signal feature to generate signals for UAVs](https://learn.safran-navigation-timing.com/t/can-i-use-custom-signal-feature-to-generate-signals-for-uavs/880)
**Author:** [@hongzhaozheng](https://learn.safran-navigation-timing.com/u/hongzhaozheng)\ **Replies:** 5\ **Last updated:** [October 19, 2022, 2:14pm UTC](https://learn.safran-navigation-timing.com/t/can-i-use-custom-signal-feature-to-generate-signals-for-uavs/880 "2022-10-19T14:14:43Z")
Hi, I would like to know if I can use custom signal feature to generate signals for UAVs (10km high) such that the UAV signals will experience atmospheric effect just like satellites. I know we need to write a XML file … --- ## [HIL latency](https://learn.safran-navigation-timing.com/t/hil-latency/656)
**Author:** [@Grace](https://learn.safran-navigation-timing.com/u/Grace)\ **Replies:** 1\ **Last updated:** [October 18, 2022, 10:44am UTC](https://learn.safran-navigation-timing.com/t/hil-latency/656 "2022-10-18T10:44:24Z")
Dear Orolia community, Do you know that you can now check the latency of your HIL system with the latest version of Skydel (22.5) using the new HIL performance graph feature? For more information on this feature, pl… --- ## [Orbit Not Matching AGI System Tool Kit (STK)](https://learn.safran-navigation-timing.com/t/orbit-not-matching-agi-system-tool-kit-stk/841)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 2\ **Last updated:** [September 26, 2022, 5:18pm UTC](https://learn.safran-navigation-timing.com/t/orbit-not-matching-agi-system-tool-kit-stk/841 "2022-09-26T17:18:21Z")
I’m trying to make a mini LEO constellation, to determine the orbit, I simulated the satellites in Systems Tool Kit (STK) first. When it was set, I transferred the orbit parameters to Skydel (including time) but it doesn… --- ## [Spoofing scenario](https://learn.safran-navigation-timing.com/t/spoofing-scenario/843)
**Author:** [@kammis](https://learn.safran-navigation-timing.com/u/kammis)\ **Replies:** 1\ **Last updated:** [September 26, 2022, 9:36am UTC](https://learn.safran-navigation-timing.com/t/spoofing-scenario/843 "2022-09-26T09:36:09Z")
I’m doing a spoofing scenario similar to the Golden Gate demo with the GSG-831. It has a transmitter jammer to knock and a spoofer that I added in the Skydel instance.They are both in interference group 1. In my Skyde… --- ## [Maximum leap second in Skydel](https://learn.safran-navigation-timing.com/t/maximum-leap-second-in-skydel/552)
**Author:** [@Grace](https://learn.safran-navigation-timing.com/u/Grace)\ **Replies:** 0\ **Last updated:** [March 23, 2022, 2:49pm UTC](https://learn.safran-navigation-timing.com/t/maximum-leap-second-in-skydel/552 "2022-03-23T14:49:29Z")
Dear Orolia community, Note that in the GPS ICD, the second leap is coded on 8 signed bits, so the maximum value that can be entered in Skydel is 127 seconds, approximately 2 minutes. Skydel will not be able to handle h… --- ## [What is Gain Offset in Constellations Antenna](https://learn.safran-navigation-timing.com/t/what-is-gain-offset-in-constellations-antenna/825)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 2\ **Last updated:** [September 1, 2022, 5:15am UTC](https://learn.safran-navigation-timing.com/t/what-is-gain-offset-in-constellations-antenna/825 "2022-09-01T05:15:28Z")
Here there is no explanation about the gain offset, what is it? --- ## [Transmission Gains of Constellations](https://learn.safran-navigation-timing.com/t/transmission-gains-of-constellations/826)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 1\ **Last updated:** [August 31, 2022, 2:54pm UTC](https://learn.safran-navigation-timing.com/t/transmission-gains-of-constellations/826 "2022-08-31T14:54:31Z")
Can I know the transmission gain of the constellations in Skydel? I thought it would be written in the gain pattern, but I believe transmission gain of GPS should be 0 dBi, but in the graph it is different. --- ## [Transmission Sequence Error, Streaming Buffer Underrun](https://learn.safran-navigation-timing.com/t/transmission-sequence-error-streaming-buffer-underrun/811)
**Author:** [@phule](https://learn.safran-navigation-timing.com/u/phule)\ **Replies:** 5\ **Last updated:** [August 31, 2022, 5:17am UTC](https://learn.safran-navigation-timing.com/t/transmission-sequence-error-streaming-buffer-underrun/811 "2022-08-31T05:17:00Z")
Dear @Grace and @pmleveel, In my simulation with Skydel, GNSS Upper L-Band GPS-L1 C/A signal was generated and streaming via 10Gb Ethernet card connected to the N310 SDR. The simulation was running for about 10sec then … --- ## [Range by skydel](https://learn.safran-navigation-timing.com/t/range-by-skydel/725)
**Author:** [@alqurask](https://learn.safran-navigation-timing.com/u/alqurask)\ **Replies:** 4\ **Last updated:** [August 18, 2022, 5:28pm UTC](https://learn.safran-navigation-timing.com/t/range-by-skydel/725 "2022-08-18T17:28:28Z")
Hello @Grace I just have one quick question. I generate simulator for known coordinate station (CORS station by NGS ) since we have observation file for the same date and time from NGS. I noticed the Range based on Pse… --- ## [Radial Velocity and Acceleration](https://learn.safran-navigation-timing.com/t/radial-velocity-and-acceleration/786)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 2\ **Last updated:** [August 16, 2022, 5:53am UTC](https://learn.safran-navigation-timing.com/t/radial-velocity-and-acceleration/786 "2022-08-16T05:53:08Z")
Can I export/generate the simulated radial velocity and acceleration of satellites along with the received power, to calculate Doppler frequency and slope? if so how? --- ## [How are skydel spectrums generated?](https://learn.safran-navigation-timing.com/t/how-are-skydel-spectrums-generated/779)
**Author:** [@alaiya.t.winter](https://learn.safran-navigation-timing.com/u/alaiya.t.winter)\ **Replies:** 3\ **Last updated:** [August 15, 2022, 8:00pm UTC](https://learn.safran-navigation-timing.com/t/how-are-skydel-spectrums-generated/779 "2022-08-15T20:00:54Z")
Are matched spectrum (MS) interferers on Skydel generated using a PRN sequence (low Power to Average Power ratio (PAPR)) or is it shaped white noise (high PAPR)? --- ## [Skydel - Multipath Echo Capacity](https://learn.safran-navigation-timing.com/t/skydel-multipath-echo-capacity/739)
**Author:** [@mventresca](https://learn.safran-navigation-timing.com/u/mventresca)\ **Replies:** 1\ **Last updated:** [August 11, 2022, 4:04pm UTC](https://learn.safran-navigation-timing.com/t/skydel-multipath-echo-capacity/739 "2022-08-11T16:04:55Z")
Skydel presently supports up to four Multipath Echo’s. Can additional Echo’s be added? What are the limitations? Do you recommend two GPUs to support the added functionality? --- ## [RINEX/CSV logging GALILEO orbits](https://learn.safran-navigation-timing.com/t/rinex-csv-logging-galileo-orbits/617)
**Author:** [@ToppDev](https://learn.safran-navigation-timing.com/u/ToppDev)\ **Replies:** 5\ **Last updated:** [July 13, 2022, 7:36pm UTC](https://learn.safran-navigation-timing.com/t/rinex-csv-logging-galileo-orbits/617 "2022-07-13T19:36:59Z")
Hello, I recently wrote a unit test for my calculation algorithm for satellite orbits, which uses the ephemeris data in the ‘RINEX Logging’ Nav Data files from Skydel and compare them to the ECEF positions inside the ‘R… --- ## [Altering the Galileo/Beidou Constellation Parameters without applying Custom Signal](https://learn.safran-navigation-timing.com/t/altering-the-galileo-beidou-constellation-parameters-without-applying-custom-signal/707)
**Author:** [@mohdyaser](https://learn.safran-navigation-timing.com/u/mohdyaser)\ **Replies:** 5\ **Last updated:** [July 5, 2022, 2:47pm UTC](https://learn.safran-navigation-timing.com/t/altering-the-galileo-beidou-constellation-parameters-without-applying-custom-signal/707 "2022-07-05T14:47:55Z")
So will the the Galileo/Beidou Constellation works normally if I make the altitude a LEO one, without applying custom signal? My receiver is not working. Theoretically, it should work, If it does, how? mine is not worki… --- ## [Approximate Positioning XYZ in Observation file](https://learn.safran-navigation-timing.com/t/approximate-positioning-xyz-in-observation-file/700)
**Author:** [@alqurask](https://learn.safran-navigation-timing.com/u/alqurask)\ **Replies:** 1\ **Last updated:** [June 27, 2022, 8:54pm UTC](https://learn.safran-navigation-timing.com/t/approximate-positioning-xyz-in-observation-file/700 "2022-06-27T20:54:54Z")
Hello @Grace , I hope you are doing well. I have question regarding python convertor tool to RINEX file. I found something weird with approximate position xyz in the resulted RINEX file using python converter. I always… [Previous page](https://learn.safran-navigation-timing.com/c/skydel-discussion/6.md?page=1) [Next page](https://learn.safran-navigation-timing.com/c/skydel-discussion/6.md?page=3)