In the meantime , " xuefeng " is famous for its anvanced products , reasonable price , and best service retuning by society , therefore , make a firm foundation with the friends 3同時(shí), “雪峰”也以她優(yōu)質(zhì)的產(chǎn)品、優(yōu)惠的價(jià)格、優(yōu)良的服務(wù)回報(bào)社會(huì),與新老朋友結(jié)下了不解之緣。
The characteristics of the method is that it can modify the guidance coefficients automatically according to the errors between the actual trajectory and the standard trajectory , this is the essential of the standard trajectory guidance . it don " t need any pre - knowledge of the coefficients , this simplifies the problem greatly . following that , the method of predicting the falling site of the instant retuning trajectory is studied 這一方法的特點(diǎn)是從反饋增益系數(shù)對(duì)再入段縱程偏差修正的本質(zhì)出發(fā),利用實(shí)際彈道和標(biāo)準(zhǔn)彈道的偏差,通過(guò)調(diào)節(jié)升阻比增量,不斷修正再入段縱程偏差,最終確定反饋增益系數(shù);這一方法的優(yōu)點(diǎn)是在求解反饋增益系數(shù)時(shí),不必依賴先驗(yàn)知識(shí)選取初值,使反饋增益系數(shù)的確定更為簡(jiǎn)便。