测量短距离
以无线方式测量相距几米的两个物体（计算机、智能手机或专用设备）之间的距离（精确度约为 10 厘米）的最佳方法是什么？ 这可以通过 WLAN、蓝牙或 GPS 来实现吗？
What's the best way to wirelessly measure the distance between two objects (computer, smartphones or a specialised device) that are a few meters apart down to a ~10cm accuracy?
Is this possible by piggybegging on WLan, bluetooth or GPS?
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Ekahau 专门利用 WiFi 来做这种事情。您最好使用光来进行精确测量，因为射频（射频）可能会因环境而失真。该领域的许多“好”解决方案拥有大量专利。
Ekahau specialise on doing this kind of thing with WiFi. You're better off using light to get precision measuring as RF (Radio Frequencies) can be distorted by the environment. There are numerous patents in this area for many of the 'good' solutions.
蓝牙、Wi-Fi、GPS、甚至超宽带 (UWB) 都无法可靠地实现这种精度。我想为您提供一个解决方案，但它需要非常非常复杂的硬件+软件。
Wi-Fi 是室内企业最常见的定位技术，但即使如此，也只能下降到一米左右。例如，为了支持 Wi-Fi，我们在 Ekahau 拥有“定位信标”，它们是独立的电池供电发射器，可进一步提高关键区域的准确性。但如果您想测量两个移动设备之间 10 厘米半径内的距离，即使它们也没有真正的帮助。
UWB 拥有“3 英尺或更好”的精度，但我不相信它会下降到 10 厘米的粒度（而且它非常昂贵并且不存在于您正在跟踪的设备中）。
GPS在室内确实不起作用，而在室外，就像之前说过的，精度是几米，而不是厘米。
蓝牙的工作频率与 Wi-Fi 相同，因此具有相同的精度限制。
Not Bluetooth, not Wi-Fi, not GPS and not even ultra wide band (UWB) can reliably achieve this type of accuracy. I'd like to provide you with a solution but it would require very, very sophisticated HW + SW.
Wi-Fi is the most common location technology for indoor enterprise, but even that can go just down to about one meter. To assist Wi-Fi, for example we at Ekahau have "location beacons" that are separate battery-powered transmitters to enhance accuracy further in critical areas. But even they don't really help if you want to measure the distance between two mobile devices within 10cm radius.
UWB boasts "3 feet or better" accuracy, but I wouldn't trust that it goes down to 10cm granularity (plus it's highly expensive and not present in the devices you're tracking).
GPS doesn't really work indoors, and outdoors, like is said before, the accuracy is several meters, not cm.
Bluetooth works over the same frequency as Wi-Fi, and thus has the same accuracy limitations.
GPS 不会给你 10 厘米的精度。您可能会得到类似于米的顺序的内容。
听起来蓝牙可以用于室内定位，但我不确定 API 等的可用性是否能让工作变得更容易。
GPS won't give you 10cm accuracy. You might get something like on the order of metres.
It sounds like Bluetooth can be used for indoor localization, but I am not sure as to the availability of API's and the like to make the job easier.
获得精确的射频定位系统固然很好，但成本高昂。惯性测量可提供10cm的精度。然而，有两个问题导致惯性测量单元 (IMU) 不太实用。
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Getting a precision RF positioning system would be nice, but costly. Inertial measurements can provide 10cm accuracy. However, there two issues that make inertial measurement units (IMU) less practical.
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