Accession Number : ADA296710

Title :   Direction Finding in the Presence of Complex Electro-Magnetic Environment.

Descriptive Note : Final technical rept. Apr 92-15 may 95,

Corporate Author : DAYTON UNIV OH

Personal Author(s) : Pasala, Krishna M. ; Friel, Edward M.

PDF Url : ADA296710

Report Date : 29 JUN 1995

Pagination or Media Count : 210

Abstract : The effects of complex electromagnetic environment on high resolution direction finding algorithms is investigated. It is demonstrated that mutually compiling adversely affects the resolution capabilities of the MUSIC algorithm. A technique utilizing the terminal impedance matrix is devised to compensate for the mutual coupling effects. Simulation studies show the efficiency of this procedure. The effect of a near field scatterer on the performance of the MUSIC algorithm is also investigated.Interference power, as little as 15dB below the signal power from the near field scatterer greatly reduces.the resolution capabilities of the MUSIC algorithm. A new away configuration is devised to suppress the interference. Modification of the MUSIC algorithm to account for the change in the array configuration restores the performance of the MUSIC algorithm. Simulations carried out using an electromagnetic model of the array and an edge type near field scatterer demonstrate the validity of the technique.

Descriptors :   *RADIOFREQUENCY INTERFERENCE, *RADIO DIRECTION FINDERS, *ELECTROMAGNETIC ENVIRONMENTS, MATHEMATICAL MODELS, ALGORITHMS, COUPLING(INTERACTION), SIMULATION, VALIDATION, RESOLUTION, ARRAYS, DIRECTION FINDING, ELECTROMAGNETIC RADIATION, CONFIGURATIONS, IMPEDANCE, NEAR FIELD.

Subject Categories : Direction Finding

Distribution Statement : APPROVED FOR PUBLIC RELEASE