This paper analyzes the effect of the DOP (Dilution of Precision) sensitivity on user’s positioning solution from a position domain view. Because conventional DOP does not account for errors based on changes in the satellite elevation angle, WDOP (Weighted DOP) concept including influence of satellite elevation angle is applied. WDOP sensitivity is defined as WDOP rate of increase when a certain satellite is removed. This value varies with geometric formation of visible satellites. In order to demonstrate the effectiveness of WDOP sensitivity, data analysis is proceeded on satellites which have same elevation angle but different azimuth angle. Each satellite is added on fixed geometric formation, this satellite’s addition changes WDOP sensitivity and has an effect on user’s position error. As a result, we confirmed that the larger WDOP sensitivity makes the larger position error rate. Thus WDOP sensitivity could be indicator of determining available satellite with low elevation angle.

Keywords: dilution of precision (DOP), Weighted DOP (WDOP), sensitivity, low angle satellite