Vehicle Radar Speed Filtering for Wheel Doppler Ghosts

The patent converts the harmful wheel doppler ghost signals into useful information by analyzing their characteristic speed patterns. The motion information processor identifies that wheel-related signals exhibit specific speed ranges (typically high speeds corresponding to wheel rotation), and uses this characteristic to distinguish and remove ghost signals from legitimate target detections, thereby improving speed estimation accuracy.

The patent changes the parameter analysis approach by introducing longitudinal speed information filtering. The motion information processor evaluates whether detected speed values fall within predetermined ranges that correspond to wheel rotation speeds. By applying this parameter-based filtering criterion, the system selectively removes ghost signals while preserving legitimate target detections, resolving the contradiction between detection capability and measurement precision.

The patent implements a feedback mechanism where the motion information processor continuously monitors detected speed values and compares them against predetermined wheel-speed ranges. When a detected object's speed falls within the wheel ghost range, the system feedbacks a correction to exclude this target from further processing. This feedback loop maintains comprehensive detection coverage while automatically filtering out wheel-related ghosts based on their characteristic speed signatures.

The patent applies partial filtering action by introducing longitudinal speed range criteria as an additional filtering step. Rather than filtering all detected targets, the system applies selective filtering only to targets whose speed values fall within the predetermined wheel ghost ranges. This partial action approach maintains detection coverage for legitimate targets while removing only the problematic wheel ghost signals.