Achieving Improved Position Detection Using a Modified Triangular Perturbation Signal

High-resolution position detection using a one-dimensional zero-dead-band photosensor receptor has been shown [1] to be possible by applying a high-frequency triangular perturbation to a normalized target image. It is shown here that for a nonzero dead-band ¿ between the receptor elements, position detection becomes increasingly uncertain as ¿ increases. By periodically changing the magnitude of the perturbation and the system gain, it is shown that accurate position detection is still possible for a receptor with nonzero dead-band.