| 1. | And it also has the characteristics of low probability of intercept and multiple access secure communication
并具有信息隐蔽、多址保密通信等特点。 |
| 2. | The low probability of intercept ( lpi ) , the ability in super - resolution and anti - jamming of ultra - wide band radar challenge to the traditional receivers
超宽带雷达具有低截获性及抗侦察、抗干扰、抗摧毁等性能,对传统的侦察体制提出了巨大的挑战。 |
| 3. | The advantages of spread spectrum communication are as follows : low probability of intercept , good anti - fading and anti - multipath interference capability . it is widely used in military and civil communication
扩频通信具有低截获率、抗衰落能力强、抗多径干扰等优点,广泛应用于军事通信和民用通信。 |
| 4. | Because of using spread spectrum technique , phase - coded radar has good anti - jamming capability and low probability of intercept property . so more and more attention has been paid to the research on it for military and civil application
相位编码雷达采用扩频技术使其具有良好的抗干扰能力和低截获概率特性，因此在军民两用方面其研究日益受到人们的关注。 |
| 5. | The techniques of low probability of intercept ( lpt ) are developing rapidly , and are used widely in radar and communication . in order to counteract the lpi techniques , there is necessary to research the new methods of detection and estimation of lpi signals
目前低截获概率( lpi )技术发展迅速，并在雷达和通信中获得广泛应用，为对抗这些技术带来的检测和估计问题，需要研究低截获概率信号检测和估计的新方法。 |
| 6. | The effects of the meteor trails orientation on the size and shape of the footprint on the ground are calculated , which the mechanism of good concealment , antijam and low probability of intercept is explained . this method overcomes the classical limitation
其次用数学的方法研究并计算了流星余迹的方位对地面“足迹”的形状和大小的影响，从而揭示了流星突发通信具有保密性好、抗干扰性、抗拦截的物理机制，克服了经典方法的缺陷。 |
| 7. | The main work of this dissertation can be summarized as follows . 1 、 the low probability of intercept ( lpi ) of uwb radar is analyzed based on the radar equation and reconnaissance equation . the necessity of making reconnaissance of uwb signal in the circumstance of low or negative snr is proved
本文主要工作如下: 1 、从超宽带雷达方程和侦察方程出发,分析了超宽带雷达信号的低截获特性,证明了超宽带雷达信号的侦察和参数估计在低信噪比条件下的必然性。 |
| 8. | Frequency - hopping ( fh ) is a novel spread spectrum communication technique , which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences , the extensive application of hf ( high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and brought up a new austere challenge for communication countermeasures
跳频通信具有良好的抗干扰性，低截获概率及组网能力，因此跳频技术的一出现，便在军事领域得到了极大的发展，采用跳频技术的短波电台在军事通信中得到了广泛应用，极大地提高了军事装备的抗截获和抗干扰能力，向通信对抗提出了严峻的挑战。 |
| 9. | Spread spectrum technique is brought forward originally in military communication for antijam and low probability of intercept . it ' s capability in security and antijam makes its expensive applications in the fields of communication and detection . application in multiple access communication techniques accelerates nowadays - 3g technique
扩频技术最早是在军事通信中为了抗干扰和降低截获概率而提出来的，它的保密、抗干扰性能使它在通信和探测领域得到广泛的应用，扩频技术应用于多址通信(码分多址)使得当今的移动通信和3g通信等技术得以快速蓬勃的发展。 |
| 10. | Frequency - hopping ( fh ) is a novel spread spectrum communication technique , which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences , the extensive application of hf / vhf ( high frequency / very high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and ensure the safety and validity of chain of military command
跳频技术是扩频技术的一种，是80年代以来出现的一种新的通信方式。跳频通信具有良好的抗干扰性，低截获概率及组网能力，因此跳频技术的一出现，便在军事领域得到了极大的发展。采用跳频技术的短波超短波电台在军事通信中得到了广泛应用，极大地提高了军事装备的抗截获和抗干扰能力，保证了军事指挥系统的安全和有效性。 |
