Centroid estimation method with sub-pixel resolution for event-based sun sensors

A new method to obtain sub-pixel measurement resolution for sun sensors based on spiking pixels is presented. The procedure is intended to increase the resolution of the estimated angle. The method uses the profile of incident light to estimate the angle of the vector towards the sun with sub-pixel resolution. Read-out time, data bandwidth, and spatial resolution are improved. Experimental results are provided. The proposed method can be implemented in any asynchronous sun sensor operating in Time-to-First-Spike (TFS) mode.