DOA estimation of space light communication sensor network with exponentially amplitude modulated LED

In sensor networks, the location measure is one of the most important information. In this research, we propose a new method of DOA (direction of arrival) estimation for localizing in sensor networks with space light communication. Each sensor node embedded with three offset mounted IR sensors and an IR LED detects DOA of other nodes´s LED light. 3D location of the network can be obtained from a set of the DOA data. The power of LED is modulated exponentially, so as to be distance-independent of DOA measurement. From simulations and experiments with a test-bed sensor, we confirm that it can detect 3D location information with the proposed 3D localization model in a real scene.