Relative Position Estimation for Mobile Objects Using Reference Identification

The patent introduces a mediator approach by using relative position estimation based on inter-vehicle distance measurements (e.g., from radar or communication signals) as an intermediary to bypass the inaccurate absolute GPS positioning. Instead of relying directly on GPS coordinates, the system estimates relative positions by measuring distances between vehicles and combining them with map data, thereby eliminating the direct impact of ionospheric delays, multipath effects, and system delays on position accuracy.

The patent applies universality by creating a unified position estimation framework that works across all scenarios - whether the preceding vehicle is within or outside the detection range of ranging sensors. The system uses map data and inter-vehicle distance information as universal inputs that remain valid regardless of sensor detection capabilities. This multi-functional approach allows the system to maintain position estimation accuracy in both situations by switching between different calculation modes while using the same fundamental data sources.

The patent extracts the problematic swing angle determination from the position estimation process. Instead of relying on inaccurate swing angle measurements to rotate the rearward area, the system separates the orientation adjustment from the core position calculation. By using map data and relative distance measurements as the primary basis for position estimation, the system removes the harmful influence of swing angle errors while still maintaining adaptability to vehicle orientation through selective use of orientation data only when reliable.