Hi everyone, I’m currently evaluating the NRF9151 for live tracking purposes and have some interesting findings to share. While testing with the nRF9151-DK, I noticed some tracking fallouts using AT#XGPS=1,1,1 during both stationary and driving tests. To isolate the issue, we conducted tests where the modem entered GNSS-only mode after obtaining a fix, disconnecting from the mobile network entirely.
For the stationary test, the results were impressive—99.77% of GNSS positions arrived at 1-second intervals, with only a few delays up to ~4 seconds. The test was conducted outside for over 3 hours, with minimal遮挡物除了一个塑料盒用于防雨。然而，在驾驶测试中，我们遇到了一些较大的GNSS位置中断，最长超过40秒，尽管仍有~98.65%的GNSS位置以1秒间隔到达。这些中断在我们的应用中非常显眼，因为我们每10秒发送一次位置。
驾驶测试在乘客座位上进行，行驶区域主要为田野、单层房屋和轻度树木覆盖的道路，没有隧道或桥梁。测试持续约45分钟，覆盖了相同的区域两次。
我想知道这种性能是否符合预期，以及使用外部天线是否能改善这种情况。如果有人有类似的经验或建议，我将非常感激！