I have a local coordinate system built with Ubisense sensors and tags (it is a real-time locating system used to automatically identify and track the location of objects or people). The local coordinate system is simply a cartesian coordinate system, which I can define the origin and axies at will except the rule that x-y panel must be horizontal, thus the z axis is vertical. After setting up the system, I can get coordinates of tags in the contained area where the sensors can get signals emitted from the tags and locate the tags. Now, I have the problem to convert the (x,y,z) coordinates into global system coordinates.
I made a model myself which took the origin of local coordinate system as a reference point and calculate the difference of other points in lat and lon to make the transformation. However, I guess there must be more standard and accurate way to deal with such problem. Since I am a noob in this field, I did google something and read some pages. However, there is rarely content relevant with this topic(much I found is from some standard to another, however is not a standard coordinate system, it is cartesian but not geocentric). Anyone can give any hints or suggestions for this problem? Your help or attention to this question will be much appreciated.