Atmospheric refraction errors significantly affect the accuracy of the exterior trajectory measurement in the range, especially for low elevation angle and distant targets. Based on characteristics of marine meteorological in the range and real test data of years, and the empirical formula of error correction for atmospheric refraction, we deduce specific refractive error correction model. Through a number of real experiment test, we conclude that the correction accuracy of the distance is less than 0.5 m, and the elevation angle less than 5 s. The model is simple, applied directly, and easy to calculate. The correction output matches the accuracy requirement of measurement of the exterior trajectory in the range, and thus can be applied to realtime data processing.