Patent ID: 8546706
Filing Date: 2013-10-01
Classification: B25J,G06F,G06K,Y10S

Abstract:
1. A position detection system for use in association with computing applications, the system comprising: a positional element for attaining a position and comprising a first emitter for emitting a continuous ultrasonic waveform as a carrier wave, said continuous waveform having continuous waveform properties and said positional element modulating said continuous ultrasonic waveform with a signal comprising positional information, thereby to provide a carrier wave with said signal modulated thereon, said continuous ultrasonic waveform being decodable to extract said signal and said positional information, therewith to fix said attained position, and a detector arrangement for detecting said continuous ultrasonic waveform comprising said signal modulated thereon, said detecting being in a manner permitting fixing of said attained position, said detector arrangement further outputting said waveform for computation, in a manner retentive of said positional information in said signal modulated thereon wherein the system further comprises a decoding unit for carrying out said computation to decode said waveform and indicate said position, said decoding unit comprising a maximum likelihood detector for carrying out said decoding by finding a most likely distance, and wherein said maximum likelihood detector comprises a channel model for modeling passage of said waveform from said positional element to said waveform decoding unit, the channel model providing a modeled reference signal against which to identify said most likely distance.