Patent ID: 7834985
Filing Date: 2010-11-16
Classification: G01S

Abstract:
1. An imaging system comprising: a transmission system for transmitting an optical signal modulated by a modulation signal comprising a binary sequence having ones and zeros; a reception system for receiving a received optical signal which is a reflected and delayed version of the transmitted signal, the reception system including a controllable shutter arrangement for allowing reception in a controllable time window, wherein the shutter arrangement times the operation of a shutter during the time window using a phase shifted version of the transmitted modulated optical signal, so as to implement a sum of products calculation between the received signal and the phase shifted version of the transmitted modulated signal; a memory device for collecting reception data derived from different time windows; a processor arranged to determine a measure of distance corresponding to a maximum correlation between the received optical signal and different phase shifted versions of the transmitted modulated optical signal corresponding to the different time windows; and means for deriving surface profile information from multiple distance measurements.