The AN/GSC-10 (KATHRYN) Variable Rate Data Modem for HF Radio

Author

Zimmerman, Mark S. ; Kirsch, Alan L.

Author_Institution

General Atronics Corp., Philadelphia, Pa.

Volume

15

Issue

2

fYear

1967

fDate

4/1/1967 12:00:00 AM

Firstpage

197

Lastpage

204

Abstract

The AN/GSC-10 (KATHRYN) is a new modem equipment for digital data transmission on HF radio circuits. Its unique modulation technique provides a wide range of signal redundancy and data rate to allow optimum performance over the correspondingly wide range of propagation conditions characteristic of HF radio. Efficient detection is achieved at all levels of redundancy by utilizing a fully coherent correlation detection technique. The detector is a continually self-adjusting matched filter to the timevarying ionospheric transfer function. The fine grain propagation data derived for detection allow continuous observation of parameters such as multipath delay and coherence time. As a variable data rate modem with channel measurement capabilities, it can serve in future fully adaptive communication nets.

Keywords

Adaptive systems; Correlation detection; Data terminals; Data transmission systems; Digital signals; Diversity reception; Electronic equipment; High frequency; Matched filters; Modems; Modulation; Phase modulation; Circuits; Coherence; Data communication; Delay effects; Detectors; Hafnium; Matched filters; Modems; Propagation delay; Transfer functions;

fLanguage

English

Journal_Title

Communication Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9332

Type

jour

DOI

10.1109/TCOM.1967.1089577

Filename

1089577