Accession Number : ADA189065

Title :   Digital Correlator for the Portable Channel Prober Measurement Instrument.

Descriptive Note : Final rept. Jan-Dec 87,

Corporate Author : STOW COMPUTER MA

Personal Author(s) : Peo, George E , Jr

PDF Url : ADA189065

Report Date : 31 Dec 1987

Pagination or Media Count : 25

Abstract : This document describes a Digital Correlator for the Portable Channel Prober Measurement Instrument being developed by the Naval Research Laboratory for use in experiments designed to characterize high frequency (HF) radio channels. This Digital Correlator is a digital signal processor designed and constructed by Stow Computer, 111 old Bolton Road, Stow, MA 01775, (617/508) 897-6838. Two Digital Correlators are integrated into the existing Digital Pre-processor to make a Portable Wideband HF Channel Analyzer. The Portable Wideband HF Channel Analyzer will be located at the receiving site of the channel probing experiment and is situated between the coherent radio receiver and the microcomputer used for data recording and analysis. The Portable Wideband HF Channel Analyzer computes the delay power spectrum of the received waveform. The in-phase and quadrature outputs of the receiver are sampled and converted to digital values by the Analog to Digital Converter, integrated by the Integrator, and correlated with a stored replica of the transmitted waveform by two Digital Correlators. The resulting tap gains are then read by the system microcomputer using the microcomputer interface.

Descriptors :   *CHANNELS, *CORRELATORS, *DIGITAL SYSTEMS, *INTEGRATED SYSTEMS, *MEASURING INSTRUMENTS, *MICROCOMPUTERS, *RADIO RECEIVERS, *RADIO TRANSMISSION, *RECORDING SYSTEMS, COHERENCE, CONVERTERS, DELAY, HIGH FREQUENCY, INTEGRATORS, INTERFACES, NAVAL RESEARCH LABORATORIES, OUTPUT, PORTABLE EQUIPMENT, POWER SPECTRA, RECEIVERS, REPLICAS, SIGNAL PROCESSING, SITES

Subject Categories : Radiofrequency Wave Propagation
      Test Facilities, Equipment and Methods
      Radio Communications
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE