# The Impact of the Turning Process on Vehicle Speed and Positioning Accuracy in GNSS Simulation **URL:** \ **Category:** GNSS Technology\ **Created:** [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")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Akio](https://avatars.discourse-cdn.com/v4/letter/a/57b2e6/32.png) [@Akio](https://learn.safran-navigation-timing.com/u/Akio)\ **Post date:** [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/1299/1 "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 undergoes a decrease and then an increase. In my understanding, the GNSS simulator is simulating the **heading speed** , so I’m a bit puzzled as to why it would change. (Because I haven’t tested this in the real world yet, I don’t know if it’s the same situation.) Additionally, during a turn, especially at high speeds, the GNSS receiver experiences a noticeable loss of lock, and the positioning error significantly increases. Is this due to the receiving capabilities of the GNSS receiver? Thank you very much. _Here is a picture obtained with the help of Skydel and StudioView (the GNSS simulator transmitting signals).【These images are all tested under uniform speed conditions.】_ ![1](https://canada1.discourse-cdn.com/flex030/uploads/orolia/original/1X/2a367350e353ab4d63d09be2e2470cdcbfff7524.jpeg) ![2](https://canada1.discourse-cdn.com/flex030/uploads/orolia/original/1X/26356ae56932b879ddb7c618d6213859d5f41bc5.jpeg) ![3](https://canada1.discourse-cdn.com/flex030/uploads/orolia/original/1X/168ae95ff0f4e080e3d8776c51f474f302e663c0.jpeg)