Accession Number : ADA328686

Title :   Application of Cyclostationary Signal Selectivity to the Carry-On Multi-Platform GPS Assisted Time Difference of Arrival System.

Descriptive Note : Master thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Streight, David A.

PDF Url : ADA328686

Report Date : MAR 1997

Pagination or Media Count : 276

Abstract : Traditional methods of time difference of arrival (TDOA) determination suffer significantly in environments fraught with co-channel interference and low signal to noise ratios. Cyclostationary signal processing techniques offer solutions to the shortcomings of the traditional TDOA methods. Specifically, the Spectral Coherence Alignment (SPECCOA) method of TDOA determination, developed by the Mission Research Corp. and Statistical Signal Processing Inc., performs exceptionally in very poor signal to noise ratio environments. The Applied Research Lab at the University of Texas at Austin (ARL:UT) has developed a prototype TDOA system, the Carry-on Multi-platform GPS Assisted Time Difference of Arrival System for the Naval Information Warfare Activity. It currently utilizes a traditional complex ambiguity function (CAF) to determine the TDOA(s) between multiple observers and an ARL:UT developed closed form solution for the geolocation of the emitter. The work presented here takes the first step in applying SPECCOA to the ARL:UT system. Coding both SPECCOA and the ARL:UT closed form solution in MATLAB(Trademark) makes possible a quantitative comparison between the CAF and SPECCOA using ARL:UT real world test signals.

Descriptors :   *SIGNAL PROCESSING, MATHEMATICAL MODELS, ALGORITHMS, POSITION(LOCATION), TIME DEPENDENCE, SIGNAL TO NOISE RATIO, ANGLE OF ARRIVAL, AUTOCORRELATION, THESES, ALIGNMENT, GLOBAL POSITIONING SYSTEM, RADIOFREQUENCY INTERFERENCE, CROSS CORRELATION, MULTICHANNEL COMMUNICATIONS.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE