平流层气象探测火箭载荷释放时间预测方法

A Method for Predicting Dropsonde Release Time of Stratospheric Meteorological Sounding Rocket

为精确预测平流层气象探测火箭在卫星导航接收系统工作异常情况下的探测载荷释放时间,在高空稀薄空气条件下,分析弹道顶点高度、速度及下降时间与火箭下降段动压之间的关联,建立了利用火箭上升段海拔高度、速度及弹道倾角预测弹道顶点参数的模型,对弹道顶点速度及高度进行预测。经计算得到了火箭自弹道顶点下降至满足减速系统开伞动压的延时时间表,以及弹道顶点速度及海拔高度预测数值表,将预测数值表按弹道倾角维进行拟合,可以有效压缩表格数据容量。利用数值表插值计算实现了载荷释放时间的准确预测,具备工程应用条件。

To accurately predict the dropsonde release time of the stratospheric sounding rocket under the condition of the abnormal operation of satellite navigation receiving system,the association between the altitude and velocity of the trajectory vertex,the time of descent from the trajectory vertex and the dynamic pressure at the descent stage of rocket was analyzed in the rarefied air of high altitude.The prediction model trajectory vertex parameter was established by using altitude,velocity and trajectory inclination of rocket ascent stage to predict the velocity and altitude at the apex of flight trajectory.The delay time data table of the rocket descending from the peak of the trajectory to meeting the dynamic pressure of the decelerating system was obtained as well as prediction data table of the velocity and altitude at the peak of the trajectory.By using trajectory inclination to fit the prediction table,the data capacity of the table can be compressed effectively.The dropsonde release time can be calculated accurately by using numerical table interpolation.