This paper presents a visual intersection measurement system that combines cooperative differential positioning with digital angle measurement for high-precision target localization in complex outdoor environments. Traditional methods struggle with accuracy, adaptability, and real-time performance. The proposed system uses cooperative differential positioning and high-precision photoelectric encoders to address these issues. Experiments show relative position errors under 0.1 m and pose angle errors within 1 milliradian. It achieves precise geolocation with a baseline over 600 m, without external differential reference. This approach enhances localization accuracy, robustness, and integration, providing a reliable solution for dynamic intersection measurements in modern range testing.