Coldstart,warmstart,hotstart

kmlhust

很多人弄不清三个概念,英文的.努力看吧.哈
Coldstart
In Coldstart, the receiver has no knowledge of its last position or time. This is the case when the RTC has not been running; no valid ephemeris data or almanac data is available (This is the case if the receiver has never been navigating or the battery backup memory is lost).
Warmstart
Warmstart is performed whenever the receiver has only access to valid almanac data, and has not significantly moved since the last valid position calculation. This is typically the case, if the receiver has been shut off for more than 2 hours, but still has knowledge of last position, time and almanac. This allows it to predict the current
visible SVs. However, since ephemeris data is not available or outdated, the receiver needs to wait for the ephemeris broadcast to complete.
Hotstart
Hotstart is performed whenever the receiver still has access to valid ephemeris data and precise time. This is typically the case if the receiver has been shut off for less than 2 hours and the RTC has been running during that time. Furthermore, during the previous session, the receiver must have been navigating (to allow it to decode and store ephemeris data).
In Hotstart, the receiver can predict the currently visible SVs, and is therefore able to quickly acquire and track the signal. Because ephemeris is already known, there is no need to wait for the ephemeris broadcast to complete.[br]<p align=right><font color=red>+3 RD币</font></p>

lw_hs

楼主辛苦了，把冷，温，热启动的资料都找到了。
支持一个 ！

kmlhust

不客气 。呵呵。偶有天书。