Accession Number:

ADA151964

Title:

A Comparison of Millimeter Wave, Direct Detect and Heterodyne Laser Intersatellite Links.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

• Edmonds,M. J.

Report Date:

1984-12-01

Pagination or Media Count:

178.0

Abstract:

This investigation determined the energy per bit to noise ratios which can be expected to be feasible in the near term low risk, within five and those forseeable beyond five years high risk for intersatellite links ISL. The ISLs considered are 60 and 90 gigahertz millimeter wave, 1064 nanometer direct detect NdYAG laser and 832 nanometer heterodyne GaAs laser. From these values the probability of bit error for various candidate signalling schemes can be determined. The required signalling bandwidth can also be evaluated. The analysis showed that for low bit rate 1 MBps ISLs, 60 GHz millimeter wave 16-ary pulse ampoitude modulation is the least risk, most bandwidth efficient implementation of those investigated. For higher bit rates 100 MBps and 1 GBps and separation angles of 120 deg or more current low risk technology is not sufficient. For ISL communication under these parameters heterodyne laser technology is the most promising. Originator-supplied keywords include Communication satellites, Millimeter waves, and Laser communications.

Descriptors:

• *COMMUNICATION SATELLITES
• *LASER COMMUNICATIONS
• ANGLES
• HETERODYNING
• HIGH RATE
• RISK
• COMPARISON
• SIGNAL TO NOISE RATIO
• MILLIMETER WAVES
• LASERS
• SIGNALS
• SEPARATION
• BANDWIDTH
• MODULATION

Subject Categories:

• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE