Accession Number : ADA320252

Title :   Modified Hopping Synthesizer Controller,

Corporate Author : DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)

Personal Author(s) : Addison, Robin

PDF Url : ADA320252

Report Date : DEC 1996

Pagination or Media Count : 165

Abstract : Defence Research Establishment Ottawa is pursuing an in-house research activity in spread spectrum technology to support development of robust, antijam satellite communications for the military. The in house effort consists of developing a system simulator to research the techniques involved in spread spectrum synchronization. For these experiments, a Hopping Synthesizer Controller is required to drive a frequency synthesizer, and is the subject of this report. The controller was built on a single board using a digital signal processor for calculations and an erasable programmable logic device for interfacing. It provides the pseudorandom hopping sequence, modulation, channel selection and Doppler precorrection. The Hopping Synthesizer Controller can drive the frequency synthesizer at hop rates up to 25 khops/s. Four configurations are supported: operation within either the payload or ground terminal simulator, for uplink or downlink. Each configuration supports commands from a Synchronization Controller and special uplink and downlink synchronization modes. In this document the software and hardware details are provided along with a user guide for the board.

Descriptors :   *SATELLITE COMMUNICATIONS, DIGITAL SYSTEMS, CANADA, SYNCHRONIZATION(ELECTRONICS), LOGIC DEVICES, FREQUENCY AGILITY, FREQUENCY SYNTHESIZERS, PSEUDO RANDOM SYSTEMS, SPREAD SPECTRUM, RADIO ANTIJAMMING.

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE