METHOD AND APPARATUS FOR CALIBRATION OF DIGITAL DOWN CONVERTER IN SIGNAL PROCESSING SYSTEM

摘要

PROBLEM TO BE SOLVED: To enable to use with an array of optical fiber interference sensors by determining an optimal offset value of an in-phase component on the in-phase component signal of a selected digital down converter. SOLUTION: The inboard receiver 102 of a submarine system 100 is connected to the electric power system of a submarine via electric power connection 106. An input light signal 118 is created by a laser module 116. Then the first channel from each sensor array is multiplexed via a signal multiplexer 121 and is processed by a receiver card 122. A frequency synthesizer 142 controls the operation of the laser module 116, and timing information is supplied for the receiver card via a circuit 144. Memory 140 related to a CPU 130 supplies system level control and condition information for other constituent elements of the receiver 102 via data circuits 132, 134, and 138. In addition, the CPU 130 controls comprehensive calibration processing procedure for the laser module.