区域网解模式下的动态精密单点定位算法与试验

Research on Algorithm of Kinematic Precise Point Positioning Based on GNSS Local Network

本文给出了区域网解模式下的动态精密单点定位的数学模型和计算方法，指出了该方法的优势和特点。利用德国波茨坦地学研究中心附近的某GNSS区域网对本文算法进行验证，结果表明：利用基准网提供的有用信息和网内双差模糊度固定解的约束条件，可大大提高动态精密单点定位的精度和可靠性，精度较浮点解提高了26％。仅利用三个站组成的区域网，即可获得优于2em动态精密单点定位精度，较传统精密单点定位精度有显著提高，可取代目前动态相对定位。

The mathematical model and algorithm of kinematic precise point positioning （ PPP ） based on GNSS local network are presented in this paper. The advantages of the proposed algorithm are pointed out. A German GNSS local network close to Potsdam Geoseienee Research Centre （ GFZ } is used to test the validation of the algorithm. The results show that the accuracy and reliability of kinematic PPP are greatly improved by adopting the useful information provided by local network and the integer constraint of the double - difference ambiguities. The accuracy of kinematic PPP can reach 2em and 26% improvement is ob- tained, compared to that of the ambiguity float solution. The proposed algorithm can replace the kinematic relative positioning for high -precision navigation and positioning.