Technical Evaluation of a Radio Direction Finding System Utilizing Complementary Sequence Phase Coding of Incident Signals.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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A new radio direction finding system has been proposed which offers advantages over current systems in the areas of bearing accuracy and simplicity of antenna design requirements. The system phase codes the outputs of a linear array of omnidirectional antennas, and then combines these time-separated signals so that the sequences produced uniquely determine the signal arrival angle. A correlation process using matched filters is performed on the resulting sequences in order to determine the corresponding arrival angle. Resolution of the inherent ambiguities of the system, due to elevation angle and adjacent quadrant azimuth components is demonstrated using a two-array technique. A computer simulation of the phase codingdecoding process, using an idealized signal model is used to evaluate the performance of the system for various input noise conditions, array lengths, and input signal parameters. Author
- Direction Finding