对于由微分-代数方程描述的一类系统,构造并研究了实时控制的零阶保持算法.为了对算法的控制误差进行补偿,提出了一个预估-校正格式,它可以将控制误差从O(h~3)改进到O(h~4).得到的结果一般是最优的.作为例子,算法应用到耗尽关机射程控制系统的制导规律的设计,其控制精度可以达到O(h~3)或者O(h~4). For a class of systems described by differential-algebraic equations, a zero-order preserving algorithm for real-time control is constructed and studied.In order to compensate for the control error of the algorithm, an estimation-correction format is proposed, which can reduce the control error from O h ~ 3) to O (h ~ 4) .The results obtained are generally optimal.As an example, the algorithm is applied to the design of the guidance law of the exhausted shut-down range control system, the control accuracy can reach 0 (h ~ 3 ) Or O (h ~ 4).