Accession Number:

ADA151746

Title:

Radiometer Integrated into a Communication Terminal.

Descriptive Note:

Technical rept.,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CA ELECTRONICS RESEARCH LAB

Personal Author(s):

• Dybdal,R. B.

Report Date:

1985-02-05

Pagination or Media Count:

26.0

Abstract:

Passive radiometric techniques for the measurement of weather-induced propagation loss in real time are well established. As communications systems move to into the extremely high frequency bands, such a real-time indication of link loss would provide terminal operators with availability information, and in addition, a complementary diagnostics capability for terminal performance. A low-cost technique and its design issues to integrate a radiometer into a communications terminal are discussed. The radiometer is designed to work simultaneously with a frequency-dopped communication receiver and provides a real-time measurement of propagation loss, detection and angular location of interference, transmitter power control to reduce excess margin and detectability, and diagnostics which complement typical BITE capability. The cost of the additional hardware for the radiometric capability is low, because the high cost elements are those shared and already an inherent part of the communication terminal. The addition of such a radiometric capability to superhigh frequencyextremely high frequency terminals should be considered in future designs. Keywords include Communication terminal, Millimeter wave propagation, Propagation loss, and Radiometer.

Descriptors:

• *RADIOMETERS
• *COMMUNICATION TERMINALS
• LOW COSTS
• REAL TIME
• PASSIVE SYSTEMS
• MILLIMETER WAVES
• FREQUENCY BANDS
• AVAILABILITY
• WAVE PROPAGATION
• INTERFERENCE
• RADIOMETRY
• EXTREMELY HIGH FREQUENCY
• TRANSMISSION LOSS
• WEATHERING
• SUPERHIGH FREQUENCY

Subject Categories:

• Radiofrequency Wave Propagation
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE