BG9JXB The fundamental requirement is that both devices have been manually set to their current locations. I was planning to try satellite tracking for the first time tonight. I had previously looked into these two apps (Guizi and Android Shuangshi Dang), but I only realized later that their timings were different, and significantly so. When I opened them, the angles and directions were also different. The image shows a look4sat RS-40S, taken while it was in transit; there are approximately 5 minutes remaining. The image shows the RS-40S within the HAM tool; it's captured during transit, with approximately 3 minutes remaining. The first two discrepancies are not significant, but the third one (SO-50) is much larger, and neither of these points appears in look4sat. Furthermore, the two frequencies are also different, so which one should we believe?
BH6BMJ What's really impressive is the cloud-based satellite app. I've used it and it has never been inaccurate.
bg5axs 早上看到楼主的帖子，刚刚回到电脑边了，我利用楼主截图检查了一下数据（一般情况下用 heavens-above 的网站检查数据的） RS40S 的数据看起来应该是基本一致的。 比如 都是 21:29 - 21:37分过境。 看起来预报时间误差不大。 但是 SO-50 的预报有 10 分钟左右的误差。小程序预报的 04:28 的过境，heavens-above的网站给出的是 04:38 过境， look4sat给出的是 04:39 过境。 我猜测可能预测时候有些参数不一致导致的。 不过其实背后的算法都差不多，主要的影响参数有几个： 经纬度 海拔 过境仰角 tle 轨道数据的更新 HAM 个人工具目前会实时获取经纬度和海拔计算，另外过境最低仰角可以设置，如果视野比较开阔可以在过境仰角 3 度以下收到信号的（特别是 ISS 的信号很好），tle轨道数据当前是 4 小时检查更新一次。 最后结合我自己的实际经验，这几个预报工具的时间基本上 ok 的，对准角度一般的八木天线误差 10 度范围都不太影响接收。可以结合多个软件一起，或者随机选一个都行。 感谢楼主的反馈， 我后面再写一个测试用例，做一下数据的对照检查 73
bg5axs BG9JXB Haha, I'm not a big shot either. Let's learn together! Looking forward to communicating with you via satellite.
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