Kalman filter makes me sad because it is such a general and powerful tool for combining information in the presence of uncertainty. At times its ability to extract accurate information seems almost magical— and if it sounds like I’m talking this up too much, then take a look at this previously posted video where I demonstrate a Kalman filter figuring out the orientation of a free-floating body by looking at its velocity. Totally neat!

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便携式信号采集及回放设备(rafavi-GN08) 是一款标准化、高性能、高可靠的信号采集与回放平台，主要用于BDS、GPS、Galileo、 GLONASS等GNSS信号的连续采集、实时记录存储及回放。
产品同时支持记录2通道(可扩展) GNSS信号，可以在固定或移动外场环境中实时记录真实卫星信号，也可以实时记录GNSS模 拟器生成的各类动态仿真信号。设备支持面板操作，通过网络进行远程上位机软件控制和数据导出。