chaff n. 1.粗糠,禾壳。 2.切细的稻草[饲料],秣;麻杆碎屑;废物。 3.不值钱的假货。 4.(干扰雷达的)金属碎箔。 be caught with chaff 受骗,上当。 chaff and dust 废物。 offer chaff for grain 挂羊头卖狗肉。 n.,vt.,vi. 戏弄,开玩笑〔多指无恶意的〕。
cloud n. 1.云。 2.云状尘埃、烟(等);(鸟、虫、飞机等的)大群,大队。 3.(水晶等的)雾斑,(镜子等上的)云斑。 4.(显出疑惑、不满、悲哀等的)阴郁脸色;遮暗物,阴影。 5.(编结的质地轻柔的)女围巾。 6.(名誉等的)污点。 a cloud of steam 雾气。 a cloud of dust 一团尘雾。 a cloud of birds (像云一样的)一大群鸟。 a cloud of arrows 一阵稠密的乱箭。 a cloud of words 暧昧话。 be lost in a cloud 烟消云散。 be lost in the cloud 隐入云中。 blow a cloud 〔俚语〕抽烟,吞云吐雾。 cast a cloud (up)on 在…上投下一层暗影。 Every cloud has a silver lining. 乌云朵朵衬白底,黑夜漫漫有尽头;任何困难情况都有可盼的希望。 drop from the cloud 从天而降。 (lose oneself) in the clouds 1. 在云层中;[喻]虚无飘渺。 2. (人)空想,呆想,茫然;(事情)不落实,不现实。 kick the clouds 〔俚语〕被绞死。 on a cloud〔俚语〕满心欢喜,兴高采烈。 under a cloud 不得意,失宠,受嫌疑,遭白眼,处困境。 under cloud of night 趁黑。 wait till the clouds roll by 等乌云散开,等时机到来。 vt. 1.使乌云密布,使变黑暗。 2.在(心)上投下苦恼的[忧愁的]暗影,使心情黯然。 3.破坏(名誉),损伤(友谊)。 face clouded with anger 因为生气而面色阴沉。 vi. 1.云层密布,变黑暗;(镜面等)布满云斑。 2.(心)变忧郁,变黯然(over, up) (脸色)阴沉下来。 adj. -less 无云的,晴朗的。 n. -let 微云,朵云,片云。
For the diffusion model and numerical simulation model , the numerical character of chaff clouds during diffusion is obtained 对扩散模型进行分析得到了箔条云团扩散过程中的数字特征。
Comparing numerical character of above two models , it shows that the variance of atmosphere motion must be modified so the time step used in numeric simulation has no effect on numerical character of chaff clouds 对数值仿真模型的分析表明必须对大气的运动方差进行时间离散化补偿,进行离散化补偿后箔条云团的数字特征不受模拟时时间步长的影响。
The diffusion model and numerical simulation model for chaff clouds are modeled on the assumption that the speed of air where chaff locates is a winner random process and the mass of chaff is zero so it can trace the atmosphere speed very well 摘要假定箔条所在位置处大气运动速度是一个维纳随机过程,同时在忽略箔条的质量时箔条的运动完全反应当地大气的运动,在此基础上建立箔条云团的扩散模型及数值仿真模型。
Avionics self - protection system is a subsystem of the advanced avionics system , which has the main functions to find hostile radar - guided weapons system and infrared - guided weapons system by using the mothed of radar reconnaissance . and then to countermeasure enemy ' s radar - guided weapon system and infrared - guided weapons system by adoptinging those measures of electric - magnetic jamming ( active countermeasures ) , chaff cloud deception jamming ( passive countermeasures ) and ir decoy deception jamming ( passive countermeasures ) so as to protect our airplanes from the hostile attacks this paper have researched deeply for the integrated mode of avionics self - protection system 航空自卫系统是先进航空电子综合化系统的一个分系统,其主要功能是通过雷达侦察方式发现敌方雷达制导武器系统和红外制导武器系统,并通过实施电磁干扰(有源干扰) 、箔条云欺骗式干扰(无源干扰)和红外诱饵欺骗式干扰(无源干扰)对抗敌方雷达制导武器系统、红外制导武器系统,保护我机免受敌方武器系统攻击。