为弥补外测级间段轨迹测量的不足,利用遥测视加速度和级间段前某时刻的外测轨迹参数建立级间段轨迹重构模型。建立精度评估方法用于方程起始边界的选择和重构轨迹的评价;建立视加速度误差修正模型降低测量误差对重构轨迹的影响;利用遗传算法优化视加速度误差修正模型参数,利用级间段后一段时间的重构轨迹和外测融合解算轨迹的比较结果构建适应度。计算结果显示,参数优化后的视加速度误差修正模型有效提高了重构轨迹可信度;视加速度的各个测量误差源是耦合的,误差修正模型参数的解不唯一;重构轨迹加速度与遥测加速度趋势一致,满足外测精度指标。

To offset the scantiness of exterior trajectory measure in interstage section, interstage trajectory reconstruction model was built using telemetry apparent acceleration and exterior trajectory parameters at a time before interstage section: Precision estimation method of exterior trajectory is built to locate the start boundary, and evaluate the reconstructed trajectory; Error correction model of telemetry apparent acceleration was built to reduce the influence by measurement error on reconstruct trajectory; Genetic algorithm was used to optimize the parameters of the apparent acceleration error model, and use the comparison between reconstruct trajectory and exterior trajectory to design objective function. The results show that, error correct model of apparent acceleration after parameters optimized improve the reliability of reconstruct trajectory effectively; The error sources of apparent acceleration are coupled, the solution of error correct model parameters is not unique: Acceleration of reconstruct trajectory has the same trend with telemetry acceleration, meets the exterior precision requirement.