Digital Transmission System.
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) modulation/demodulation (modem) technique. Testing of the DAR-IV was performed using the RADC troposcatter media simulator and the actual over-the-air tests on the AN/TRC-97 and AN/TRC-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 US/NATO 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1979
- Accession Number
- ADA080894
Entities
People
- Carl Alsmeyer
- Manfred Unkauf
- Paul Danis
Organizations
- RTX