使用GPS和Web更新在Windows Mobile上延长电池寿命 [英] Increasing Battery Life on Windows Mobile using GPS and Web updates
问题描述
我有一个应用程序可以在Windows Mobile上运行，并使用GPS以不同的时间间隔更新其位置。正如所料，启用GPS芯片会使用更多的电池电量。 （没有......）
因此，目前我的技术已经开启/关闭GPS，每4分钟获取一次地点，如果事情发生变化，请做些事情，并在必要时更新其位置。
在我一岁的HTC Touch Diamond手机上，充满了新鲜的电量，屏幕亮起（但变暗），+ WiFi ，并且什么都不做，只是让它坐在那里，我最多可以从它里面获得6个小时。
这是好的，但是GPS的使用很容易削减估计2-4小时的常规真实世界使用（YMMV）。
另一种选择是我只是在考虑 关键是让Web服务器发信号让手机在需要时更新其位置，而不是盲目地做手机。
这样，手机只使用电源获取数据连接并检查服务器。如果服务器告诉它更新，只有这样它才会打开GPS。
除了响应时间慢得多（我猜测）和如果手机在某个地方无法获得稳定的更新，那么您甚至不会知道它的最后位置。在这一点上，你一直在等待。
我希望手机可以更加自主。是否有更好的算法可以用来改善这种设置？
谢谢。
您正在使用的GPS引擎是否有任何可访问的内置低功耗操作模式。我已经将来自SiRF和u-blox的几种不同的GPS芯片组嵌入到产品中，并发现，在低功耗模式下，开启GPS的电池电量更便宜，而不是关闭GPS，然后让其重新获取。在我的情况下，它在低功耗模式下的所有关机时间少于约15分钟，所用的能量更少。
基于SiRF（SiRFStar-2和SiRFStar-3）的GPS发动机具有涓流功率模式，其中GPS每次唤醒时仅接通几百毫秒。唤醒间隔可以设置为5秒，这意味着功耗是连续开启状态的5-10％。在精度上有一些小的折衷，但如果修复质量下降，芯片组将返回到持续供电模式。
I have an app that runs on Windows Mobile and uses the GPS to update its location at various intervals. As expected, enabling the GPS chip uses more battery power. (no duh..)
So currently my technique has been to cycle the the GPS on/off at approx. every 4 minutes to acquire the location, do something if things changed, and update its location to the web only if necessary. Otherwise, shut it off again and wait.
On my one year old HTC Touch Diamond phone, with a fresh charge, leaving the screen ON (but dimmed), + WiFi, and doing nothing else but letting it sit there, I got a maximum of 6 hours from it.
This is "ok", but the usage of the GPS easily cuts an estimate of 2-4 hours of regular 'real-world' usage (YMMV).
The other option I've simply been thinking about is to have the web server instead signal the phone to update its location when needed, instead of the phone just doing it blindly.
That way, the phone only uses power to get a data connection and check the server. If the server tells it to update, only then does it turn on the GPS.
Except that the response time of that is much slower (I'm guesstimating), and if the phone is somewhere it can't readily get a stable update, then you won't even know its last location. At which point, you're stuck waiting.
I was hoping the phone could be more autonomous.
Is there possibly yet a better algorithm I could use to improve this setup?
Thanks.
Does the GPS engine that you are using have any accessible built-in low power operating modes. I have embedded a couple of different GPS chipsets from SiRF and u-blox into products and found that it was cheaper in battery power terms to leave the GPS switched on in its low power mode than to turn it off and then let it re-acquire. In my case it used less energy in a low power mode for all switch off times less than about 15 minutes.
SiRF (SiRFStar-2 and SiRFStar-3) based GPS engines have a "tricklepower" mode where the GPS is only switched on for a couple of hundred milliseconds on each wakeup. The wakeup interval can be set to maybe 5 seconds, meaning that the power consumed is 5-10% of the continuously on state. There is some small tradeoff in accuracy, but the chipset will return to continuously powered mode if the quality of the fix is degraded.
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