Let me start by stating that I am a student with very little experience so I am starting at square one, so please bear with me.
I am looking to create a local positioning system between 1 transmitters and N receivers (3-6 most likely). This is in a outdoor space about 10m x 10m and I only care about 2D location. I would like accuracy to be within 0.2m or so. The area will be very flat and open and the only disturbance will be the sound of a small engine. The transmitter will be moving with the receivers remaining stationary (that's how I imagine it anyways). The inherent design of the systems requires the transmitter to be moving very slowly, roughly walking speed or slower.
Given my accuracy limitations GPS is out of the question, and given the idea of a moving transmitter I decided an IR sensor would not give me the multiple directions for multiple receivers I require. After all this I decided an ultrasonic sensor would most likely give me the result I require. As you can probably tell I'm still stuck in the design phase and want to solidify an idea that would give me closet to the desired results.
Am I correct in thinking that I can use a combination of ultrasonic transmitters/receivers to triangulate the location of the moving transmitter? Is there possibly a better system for what I'm trying to do?
I wish I could bring more technical questions to the table, but the more technical information I look up the more I realize I need to understand the fundamentals of what I am trying to accomplish first. I have very little practical information, so even links to readings or videos would be greatly appreciated.