Accuracy and calibration of infrared signal-direction discriminator

Vehicle positioning in infrared vehicle-to-infrastructure communication systems can be realized with the aid of signal-direction discrimination. The coming direction of the infrared signal can be acquired with high precision by comparing the sgnal strengths received by different receiving modules in the signal-direction discriminator, provided that all the receiving modules together with their amplification circuits have the same characteristics. This can be fulfilled by a careful calibration. In this paper, the results of two different calibration methods are compared in order to obtain the coming direction of the signal with high accuracy for the aforementioned application.