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相控阵雷达的发射机既可采用单机,也可用许多发射单元来组合。采用组合方式时其可靠性关系可归结为二项式概率分布。电子计算机计算结果表明:(1)对每一发射单元平均无故障时间(MTBF)_A的要求大致应为整个发射机(MTBF)_R的8～20倍;(2)发射机达到(MTBF)_R之前的工作时间内,组合方式的可靠性要比单机方式好很多;(3)因此当每一发射单元的可靠性非常高时,组合方式是很可取的,否则,不如采用单机方式为好。
Phased array radar transmitter can be used stand-alone, but also can be used to combine a number of launch units. The reliability relationship when using combinations can be attributed to a binomial probability distribution. Computer calculations show that: (1) The MTBF_A requirement for each transmitting unit should be approximately 8-20 times the total transmitter (MTBF) _R; (2) the transmitter achieves (MTBF) _R Before the working hours, the reliability of the combination is much better than the stand-alone mode; (3) Therefore, when the reliability of each transmitting unit is very high, the combination mode is preferable; otherwise, the stand-alone mode is better.