中文摘要：

现代罗兰C定位体制正从双曲线定位向圆-圆定位,从单台链定位向多台链交叉定位模式发展。为了提高和扩大长河二号系统的定位精度和覆盖范围,通过理论预测和海上实验,研究了不同定位体制和台站组合模式下的罗兰C定位精度预测模型,给出了长河二号系统预测等精度线图。结果表明,在相同测量精度条件下,圆-圆定位具有更大的覆盖范围,多台链交叉定位能明显改善台链结合区域的定位精度,考虑ASF（Additional Second-phase Factor,附加二次相位因子）后,该预测模型可以用于长河二号系统定位精度预测。

英文摘要：

Modern LorawC is developing from hyperbolic positioning to range range positioning, and its station con figuring modes are developing from single chain to muhi chains. To improve the positioning precision and extend the coverage area of Changhe II system, the prediction model of positioning precision for both positioning mechanisms and both station configuring modes is established on the basis of theoretical deriwttion and sea trial. The predicted positioning precision contour map is given. The study shows that for given measuring precision, range-range positio ning has larger coverage area than hyperbolic positioning, and multi chains positioning significantly improves positio ning precision in the intersection area of chains, compared with the single chain positioning. The prediction model can be used for the positioning precision prediction of Changhc Ⅱ system when the ASF（additional second-phase fac- tor） is taken into account.