Among the different imaging algorithms , the range - doppler fft ( r - d fft ) algorithm , based on range - doppler theory , in which the fast fourier transform ( fft ) is employed to reduce compute burden , is widely used in various imaging radar because it can be easily realized in real - time application 陆基成像雷达( gbr )作为isar成像技术的重要应用,其观测目标具有速度快,惯性大,运动相对平稳等特点,针对这些特点,本文对isar成像运动补偿方面作了较为深入的研究。
Here we report that the genetic identification of h9n2 influenza viruses from those newly forming poultry in this region , partridge and chukka . our results suggest that those h9n2 influenza viruses isolated from these types of terrestrial poultry are not sorted into the following two genotypes , i . e . , qa / hk / gl / 97 - like and dk / hk / y280 / 97 - like virus lineages . genetic analysis revealed that some of them are reassortment viruses between above two lineages 结果表明， h9n2亚型流感病毒在这些新种群中广泛流行，并且检测到多个基因型的存在，进化树分析证实有多个基因型与同期在水禽类中分离到的基因型相近：这表明h9n2亚型流感病毒很可能通过发生跨种属传递从水禽感染这些小种群陆基禽类。
With the design and realization of the servo system of the airborne ( shipborne ) target ' s real - value measurement equipment as the background , and with a view to the especial problems which have to be faced with in servo control system ( that is the bad condition , contradiction between the weight and the power and the disturbance of the carrier ) , it is difficult to reach the high stabilization precision and the tracking precision by traditional control technique , so by means of refer to a great deal of references and base on the summary of the domestic and overseas designing schemes , control technique adapted to the airborne ( shipborne ) equipment is brought forward . theoretical analysis and researches are presented in this dissertation and are applied to the practical design and realization of the airborne ( shipborne ) real - value measurement servo controller 本文以某工程研制项目机(舰)载目标真值测量设备的伺服系统研究和实现为依托，着眼于机(舰)载测量设备伺服系统所必须面对的与陆基设备相比的特殊问题(即环境条件更为恶劣、体积和功耗的矛盾及载体扰动带来的精度降低等) ，提出传统的控制方法难以使系统达到高的稳定精度和跟踪精度，因此，通过查阅大量的国内外文献及总结了国内外光电稳定与跟踪系统设计方案的基础上，提出了适用于机(舰)载伺服系统的控制方法，从理论上进行了分析和研究，并将之应用到具体的研究与实现中。
This paper researches the problems of target damage law , accumulating damage effect , correlation and target fuzzy damage , which points out that it is necessary and insistent to apply new mathematic theory methods to rebuild the arithmetic theory of firing efficiency in the currently continent - based missile weapon system 针对毁伤律问题、积累毁伤效应问题、相关性问题、目标毁伤的模糊性问题进行了探讨，指出应用当代新的数学理论方法改造现行陆基常规导弹射击效率算法理论的必要性和迫切性。
The far - distance targets can be detected with the aid of the satellite image and the ample respond time of the defensive system can be provided ; the cryptic cruise missile and anti - radiation cruise missile can be effectively detected and tracked recur to the infrared image . radar is widely used in the cruise missile defensive system . the radar in the sky can detect the further flying cruise missile , ground based radar and coastal defense radar can track and help weapons system aim at the oncoming force cruise missile 在目前情况下，卫星图像、红外图像以及雷达成像在探测、跟踪、识别、打击巡航导弹目标方面具有相当大的优势，借助于卫星图像可以在远距离发现目标，能够为防御系统提供比较充足的响应时间；借助于红外图像可以有效对付隐身巡航导弹和反辐射巡航导弹；雷达是在巡航导弹防御系统中使用最多的设备，空基雷达能够探测离防区比较远的巡航导弹，陆基雷达和海基雷达能够跟踪巡航导弹，并可协助武器系统瞄准来袭巡航导弹，尤其是雷达阵在巡航导弹防御中更是可以发挥重要作用。
