Accession Number:

ADA023040

Title:

MLS Multipath Studies. Volume I. Mathematical Models and Validation.

Descriptive Note:

Project rept. Mar 74-30 Sep 75,

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Report Date:

1976-02-25

Pagination or Media Count:

254.0

Abstract:

This report summarizes MLS multipath work carried out at Lincoln Laboratory from March 1974 to Sept. 30, 1975. The focus of the program is the development of realistic models for 1 the multipath in representative real world environments and 2 the multipath characteristics of candidate MLS techniques. These multipath and system models are used in a comprehensive computer simulation to predict the strengths and weaknesses of major MLS systems when subjected to representative real world environments. The report is organized into two volumes. Volume I describes the algorithms and validation of various portions of the program. In volume II, the simulation or selected protions thereof is applied to key multipath related MLS issues. Mathematical models are given for the major MLS multipath sources ground reflections, building and aircraft reflections, and shadowing by objects and humped runways, and it is shown that they agree well with field data including the Lincoln measurements at Logan Airport. Models for the techniques Doppler and scanning beam considered in phase II of the U.S. MLS program are presented together with validation by comparison with theory and bench tests. Also persented are the results of a general study in motion averaging. The validated computer simulation and portions thereof is then applied to studying 1 the critical areas required by the TRSB system to avoid excessive relfection effects, 2 the expected TRSB performance with vertical polarization and benefits that might be derived with an alternative polarization and 3 siting of a specific TRSB system at Friendship International Airport MD. Author

Subject Categories:

  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE