如何让SI4432在有效数据包接时读回来的RISS值更稳定?
本帖最后由 pentong 于 2013-8-5 10:50 编辑两个RF模块一收一发，通信距离和位置保持不变，当si4432收到有效数据包时，芯片会冻结这一帧的RISS值，让单片机每次读去这个值时，发现每次偏差挺大的，不清楚用什么方法能让每次读回来的值区域稳定，不清楚调整引导码长度是否可行？
我也尝试用RSSI 测试两点的距离。也是一发一收，但是 接收到数据后读这个RSSI值 不是太稳定，有时候 距离很短，1米不到 读出来的值很小 这是在官网看到人家的讨论：
Hi,
I implemented CCA, and it works well. I use CCA on the Slave radio to detect when the Master stopped sending. My master transmits continuously for 1 second. So when I receive an interrupt, I go into a Receive loop (Receiver enabled) on the slave, and read the RSSI. I read the RSSI every 10msec, and take an average of 5 at a time. I always store the highest RSSI average obtained. When my master stops sending, my RSSI usually drops to below 50%. I exit my Receive loop, when my average RSSI drops 30% below my maximum RSSI recorded.
Note : When in the Receive loop, re-enable Receive mode after every read from RSSI registers, since it exists Receive mode automatically. pentong 发表于 2013-8-9 22:52 static/image/common/back.gif
这是在官网看到人家的讨论：
Hi,
如果按照他的说法,功耗肯定下不来,连续发射1S,每10ms读一次RSSI然后平均,发射与不发射的平均值才下降50%,如果用于测距更新率和功耗是大问题.
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