Based on the sequential probability ratio test (SPRT) developed by Wald, an improved method for successful probability test of missile flight is proposed. A recursive algorithm and its program in Matlab are designed to calculate the real risk level of the sequential test decision and the average number of samples under various test conditions. A concept, that is "rejecting as soon as possible", is put forward and an alternate operation strategy is conducted. The simulation results show that it can reduce the test expenses.
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