将 RSSI 转换为距离
如何将 RSSI 转换为距离?我有三个坐标 RFID 读取器:Reader1(0,0)。读者2(0,8),读者3(8,5)。应答器获取 RSSI,从阅读器 1 获取 156,从阅读器 2 获取 115,从阅读器 3 获取 124。我如何获得应答器与 reader1、reader2 和 reader3 之间的距离?也是应答器的坐标。 RFID 读取器的信号强度为 0-255。 255 如果很接近,0 如果很远。 我得到 RSSI公式来自互联网,但我很困惑如何翻译A和NAi的参数。 你能帮我吗?
谢谢你:-)
how to convert RSSI to distance?. i have three coordinate RFID reader : Reader1(0,0). reader2(0,8), reader3(8,5). Transponder get RSSI, 156 from reader1, 115 from reader2 and 124 from reader3. how i can get distance between Transponder to reader1, reader2 and reader3? also coordinate of Transponder.
Signal strength from RFID Reader is 0-255. 255 if so close, 0 if so far.
i got RSSI formula from internet, but i confused to translate the parameters of A and NAi.
can u help me?
thx u :-)
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哥们,我澄清一下:RSSI(接收信号强度指示器)与距离无关。我们必须明白,RSSI 值以分贝为单位,与以瓦特表示的功率比呈对数关系。公式为Db = 10*Log(瓦特)。
为什么它与距离无关?这是因为信号强度比取决于使信号更容易或更难传播的环境(例如墙壁、深度、结构等)。换句话说,相同距离可以有不同的 RSSI 值,就像我们可以在开放区域或公路隧道内使用手机进行实验一样。
同样,RSSI 与距离无关。唯一可以自由转换这两个值的情况是在理论上的非实际情况下,其中环境(地球形态、结构、空气密度等)不具有相关性。在这些情况下,您属于物理上下文,而不是 stackoverflow(编程)上下文。
Buddy, let me clarify it: RSSI (received signal strength indicator) do not relates with the distance. We must understand that the RSSI value is given in decibel, a logarithm relation with the power ratio expressed in watt. The formula is Db = 10*Log(Watt).
And why it does not relates with distance? Its because a signal strength ratio depends on the environment (such walls, deep, structures, and so on) that makes the signal propagate more easily or more hardly. In other words, you can have different RSSI values for the same distance, as we can experiment if we use a cellphone at an open area, or inside a road tunnel.
Again, RSSI is not related with distance. The only situation where you can freely convert these two values is in theoretical non-practical situations, where environment (earth form, structures, air density, etc) do not takes relevance. In these situations, you fall in physics context, and not in stackoverflow (programming) context.