Accession Number:

ADA080894

Title:

Digital Transmission System.

Descriptive Note:

Final technical rept. 10 Mar 76-Feb 78,

Corporate Author:

RAYTHEON CO SUDBURY MASS EQUIPMENT DEVELOPMENT LABS

Report Date:

1979-10-01

Pagination or Media Count:

220.0

Abstract:

The objective of this program was to improve the performance of an earlier experimental model by replacing existing circuit card assemblies with new circuits that would enhance the performance of the DAR-IV technique. Therefore, emphasis of the DTS program was to implement improvements in the basic design which included increased memory of the demodulator coherent filter, modification of the clock recovery loop for increased stability, improvement in bit count integrity and modification of the adaptive equalizer associated with increasing demodulator coherent filter memory. Digital transmission was accomplished at data rates of 1.75, 3.5 and 7.0 Mbps by using the Distortion Adaptive Receiver DAR-IV modulationdemodulation modem technique. Testing of the DAR-IV was performed using the RADC troposcatter media simulator and the actual over-the-air tests on the ANTRC-97 and ANTRC-132 on the RADC Troposcatter Experimental Range in Rome, New York and on NATO Strategic Troposcatter ACE-HIGH links between Dosso Dei Galli, Italy and Feldberg and Kinsbach, Germany as part of the combined USNATO digital troposcatter Test Program. The test results show that the DAR-IV technique has the potential to provide quality digital data transmission on both tactical and strategic troposcatter links. The DAR-IV was shown to typically operate within 2 dB of theoretical in back-to-back tests.

Subject Categories:

  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE