FMCW Radar Leakage Cancellation for Short-Range Detection Sensitivity

The patent converts the harmful short-range leakage signal into a useful resource by estimating its channel coefficients and using them to reconstruct the leakage signal for cancellation. The leakage signal, which was previously detrimental, is now utilized to create a cancellation signal that removes the harmful effect, thereby enabling miniaturization without sacrificing detection performance.

The patent implements a feedback mechanism where the received signal is processed to estimate channel coefficients, which are then used to reconstruct the leakage signal and generate a cancellation signal. This closed-loop feedback system continuously monitors and corrects the leakage effect, allowing the system to maintain performance despite reduced antenna spacing.

The patent performs preliminary actions by estimating channel coefficients from the received signal before the main cancellation process. The computing circuit calculates delay coefficients, phase coefficients, and amplitude coefficients in advance, which are then used to reconstruct the leakage signal. This preliminary estimation enables efficient cancellation without requiring overly complex real-time processing.

The patent creates a copy of the leakage signal by reconstructing it from the received signal and estimated channel coefficients. Instead of directly eliminating the leakage, the system copies its characteristics and uses the copy to generate a cancellation signal. This copying approach simplifies the processing by working with a reconstructed version of the leakage rather than the original complex interference.