IFM Receiver DFT Confirmation for Time-of-Arrival Estimation

The patent implements feedback by using the measured frequency to generate a confirmation signal through DFT processing. The system feeds back the frequency measurement result into the confirmation process, where the measured frequency is used to create a test signal that is compared against the original signal to verify measurement accuracy. This closed-loop feedback mechanism ensures reliable frequency identification without requiring complex additional hardware.

The system performs self-verification by using its own frequency measurement output to generate a confirmation test. The measured frequency is automatically used to create a reference signal for DFT comparison, allowing the system to self-validate its measurements without external intervention or complex additional processing circuits.

The patent segments the digital signal processing into distinct functional blocks: one-bit ADC stage, frequency measurement stage, confirmation stage using DFT, and pulse width measurement stage. Each segment performs a specific function with optimized complexity, allowing the system to maintain manufacturing simplicity while achieving accurate measurements through coordinated operation of segmented processing stages.

The system applies partial DFT processing focused specifically on confirming the measured frequency rather than performing a complete spectral analysis. By concentrating computational effort only on the measured frequency point and its confirmation, the system achieves accurate frequency and pulse width measurements without requiring full-spectrum processing, thus maintaining ease of manufacture.

The patent merges frequency confirmation and pulse width measurement into a unified DFT-based processing framework. The same DFT operation that confirms frequency measurements also provides the phase information needed for accurate pulse width measurement, eliminating the need for separate detection procedures and reducing overall detection complexity while maintaining high reliability.

The DFT processing module serves multiple functions simultaneously: it confirms frequency measurements by comparing spectral content, determines pulse width through phase analysis, and provides time-of-arrival estimation. This multi-functional approach increases detection reliability without proportionally increasing procedure difficulty, as a single processing operation achieves multiple detection goals.

The system performs preliminary frequency estimation using the IFM technique, then uses this preliminary result to guide the confirmation process. By having the frequency estimate ready before confirmation, the system can immediately apply targeted DFT processing at the estimated frequency point, maintaining real-time processing speed while ensuring measurement precision through subsequent confirmation.

The confirmation process skips unnecessary computational steps by directly testing the measured frequency point rather than performing exhaustive spectral search. The system rushes through the confirmation by focusing computational resources only on verifying the already-measured frequency, thus maintaining fast processing speed while achieving accurate parameter measurement.