Accession Number : AD0846134

Title :   A Sequential Self-Synchronous, Beam Tagging Technique for Adaptive Control of Transmitting Arrays.

Descriptive Note : Technical rept.,

Corporate Author : OHIO STATE UNIV COLUMBUS ELECTROSCIENCE LAB

Personal Author(s) : Tourdot, James E.

Report Date : DEC 1968

Pagination or Media Count : 143

Abstract : A sequential, self-synchronous, beam tagging technique for the control of an adaptive transmitting array is presented and analyzed. The beam tagging operation, phase error measurements and phase corrections are performed sequentially in time for each signal transmitted from the array. This approach eliminates the need for more than one beam tagging modulation. The system is self-synchronous since the phase error detection receiver processes the down-link signal to obtain phase control information in the presence of the data modulation. An analysis is performed which relates the phase error measurement accuracy to the system parameters, namely: (1) the data transmission rate, (2) the number of array elements, (3) the signal-to-noise ratio and (4) the time devoted to estimating the phase error. A particular closed-loop model for the phase control operation is developed and shown to be equivalent to a sample data feedback control system. This closed-loop model is analyzed to determine the required phase measurement accuracy and the phase correction rate for successful adaptive transmitting array operation. (Author)

Descriptors :   (*SPACE COMMUNICATIONS, PHASED ARRAYS), (*PHASED ARRAYS, ADAPTIVE CONTROL SYSTEMS), COHERENT RADIATION, PHASE DETECTORS, PHASE SHIFT CIRCUITS, PHASE(ELECTRONICS), ERRORS.

Subject Categories : Electrical and Electronic Equipment
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE