Patent Number: 6,167,024

Title: Multiple channel control using orthogonally modulated coded drive signals

Abstract: An orthogonal pilot tone servo controller provides a servo control loop for each tap in a delay line processor where each servo acquires its independence from the other tap's servos utilizing an orthogonal code set modulated on top of the existing tap values. The orthogonal codes are attenuated in amplitude such that the code sets are transparent to the processed signals of interest, but the code's length enables each tap's servo controller to independently recover the tap's state from the aggregate of signals and codes through processing gain realized in each loop's recovery circuit. A plurality of taps can be thus be servo controlled simultaneously, providing for extremely wide bandwidth processes which can be performed accurately with digital controls.

Inventors: Upton; Eric L. (Redondo Beach, CA), Wickham; Michael G. (Rancho Palos Verdes, CA), Smith; Martin P. (Redondo Beach, CA)

Assignee: TRW Inc.

International Classification: H04J 14/00 (20060101); G02B 6/34 (20060101); H04B 007/216 ()

Expiration Date: 12/26/2013