# The rssi which I receive is inaccurate

**URL:** <https://bbs.aprbrother.com/t/the-rssi-which-i-receive-is-inaccurate/1747>\
**Category:** AprilBeacon\
**Created:** [March 4, 2021, 3:12am UTC](https://bbs.aprbrother.com/t/the-rssi-which-i-receive-is-inaccurate/1747 "2021-03-04T03:12:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Liangyz2019](https://bbs.aprbrother.com/letter_avatar_proxy/v4/letter/l/6de8d8/32.png) [@Liangyz2019](https://bbs.aprbrother.com/u/Liangyz2019)\
**Post date:** [March 4, 2021, 3:12am UTC](https://bbs.aprbrother.com/t/the-rssi-which-i-receive-is-inaccurate/1747/1 "2021-03-04T03:12:19Z")

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手机与各个ibeacon设备的放置位置如图所示  
The location of the mobile phone and each ibeacon device is shown in the figure

 ![WIN_20210304_10_53_29_Pro](https://bbs.aprbrother.com/uploads/default/original/1X/bf68641cb20c0e7b24b2a42ac43c4054382fb0ad.jpeg)  
我编写的Android程序接收到的信息如下表所示  
the information which i receive from my android program as follows(if you want research source code, please contact me)  
 ![2021-03-04(1)](https://bbs.aprbrother.com/uploads/default/original/1X/a4069dcdef67710225470dbe47219cfeb0fece7b.png)  
各设备之间也无明显的遮挡物，得出来的rssi却不尽人意  
There is no obvious shelter between the devices, but the RSSI is not satisfactory  
远的4，5不说，我希望至少近的2，3能测得准一点，请问有什么办法吗？  
regardless of 4,5, I hope at least 2, 3 can be measured accurately, what can I do?  
我使用的rssi转换distance的公式是  
public double getDistance(int measuredPower, double rssi) {  
if (rssi \>= 0) {  
return -1.0;  
}  
if (measuredPower == 0) {  
return -1.0;  
}  
double ratio = rssi \* 1.0 / measuredPower;  
if (ratio \< 1.0) {  
return Math.pow(ratio, 10);  
} else {  
double distance= (0.42093) \* Math.pow(ratio, 6.9476) + 0.54992;  
return distance;  
}  
}

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**Author:** ![aprilpea](https://bbs.aprbrother.com/user_avatar/bbs.aprbrother.com/aprilpea/32/9_2.png) [@aprilpea](https://bbs.aprbrother.com/u/aprilpea)\
**Post date:** [March 5, 2021, 3:15am UTC](https://bbs.aprbrother.com/t/the-rssi-which-i-receive-is-inaccurate/1747/2 "2021-03-05T03:15:05Z")

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由于蓝牙属于2.4GHz高频信号，在实际环境极易受到影响和干扰，因此波动较大属于正常现象。直接用于测距精度较低

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**Author:** ![Liangyz2019](https://bbs.aprbrother.com/letter_avatar_proxy/v4/letter/l/6de8d8/32.png) [@Liangyz2019](https://bbs.aprbrother.com/u/Liangyz2019)\
**Post date:** [March 5, 2021, 6:59am UTC](https://bbs.aprbrother.com/t/the-rssi-which-i-receive-is-inaccurate/1747/3 "2021-03-05T06:59:41Z")

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但距离较近应该还是可以得到个大概的吧，请问有什么办法呢？比如调整ibeacon姿态或者其他的