Application of Cyclostationary Signal Selectivity to the Carry-on Multi- Platform GPS Assisted Time Difference of Arrival System

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.Naval Postgraduate School Monterey CA is the author of 'Application of Cyclostationary Signal Selectivity to the Carry-on Multi- Platform GPS Assisted Time Difference of Arrival System', published 1997 under ISBN 9781423580935 and ISBN 1423580931.