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IMPROVED FAST FOURIER TRANSFORM SENSOR PROCESSOR USING ENHANCED FREQUENCY DOMAIN PRINCIPLES
IMPROVED FAST FOURIER TRANSFORM SENSOR PROCESSOR USING ENHANCED FREQUENCY DOMAIN PRINCIPLES
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机译：使用增强的频率域原理改进的快速傅里叶变换传感器处理程序
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摘要
A system for improving signal detection for use with a fast Fourier transform processor (15), linear detector (16), and traditional integrator (17) is disclosed herein. The system measures FFT output phase standard deviation (606) over a number of consecutive FFT runs, and subsequently adjusts the output for processing phase shifts. The system corrects FFT output phase in an organized fashion for all potential signal filter offset positions while measuring changes in phase standard deviation, and selects the filter offset where the minimum standard deviation occurs. The system utilizes pseudo coherent integration to augment and enhance traditional integration, where said pseudo coherent integration locates the mean phase shift within the number of FFTs integrated and corrects all FFT runs by this mean shift value. The integration multiplies the magnitude of each FFT filter output by the cosine of the corresponding corrected phase and summing all FFTs in the integration period for the respective filter. Detections are then declared based on outputs from a combination of a single filter detector, a sum coherent and traditional detector, a filtered coherent detector, and a filtered traditional detector (613), thereby utilizing various blended techniques across the filter bandwidth.
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