The CRC error detection algorithm combined with RS code is utilized to correct random and burst errors, and thereby to improve the bit error rate performance. In techniques of spread spectrum, M sequences are used to improve the anti-jamming capability of system. In addition, it is also good for making a decision about synchronization. Soft spread spectrum technique is used in this system by using Walsh sequence. The raised cosine pulse shaping filter is adopted to confine the signal spectrum through which inter-symbol interference is eliminated. We propose using correlation test technique to achieve synchronization acquisition. Rake receiver is used to reinforce the ability of anti-multi-path and anti-fade.
在发送端，我们采用CRC与RS码相结合的纠检错技术，增强了系统纠正随机错误和突发错误的能力，改善了系统的误码性能；扩频技术中采用M序列作为伪随机码，增强了系统抗干扰能力，有利于捕获阶段系统的正确同步；在本系统中我们选用Walsh序列来实现多进制扩频；采用升余弦滤波器技术，限制了信号的频谱，同时保证无码间串扰传输；接收端则采用相关检测技术实现信号的同步捕获；加入Rake接收技术，增强了系统抗多径、抗衰落的能力。
The fuse, having excellent cut-off performance of the distance and strong anti-jamming capability, is one of the important directions of the fuse develop. The experimental system of pseudo-random code phase-modulation fuze is designed in the paper. The performance of jamming sources is measured by ECCM tests, meanwhile, the anti-jam performance of this fuse is evaluated.
本文主要设计一种实验性伪码定距引信系统，为该引信的实验性干扰源系统提供实验平台，通过电子对抗实验，以检测干扰源系统的干扰性能，同时对该引信的抗干扰性能进行评估。
In this paper, the theory, algorithm, and experiment of automatic object detection and tracking are studied in depth. It is firstly pointed out that the essential of Mean Shift method is a special Newton-Gaussian method. A new method named Fast Mean Shift is established to stretch the conservative step of Mean Shift method. The convergence and validity of this new method are proved in theory. And it is also proved that the convergence speed of Fast Mean Shift is faster than that of Mean Shift. The contrast experiments of searching the maximum possibility density of random of data sets in plane and 3D space are done. The results show that this new method can reduce the iterations greatly. A new object tracking method based on Fast Mean Shift is built to improve the object tracking performance, which is shown in the face tracking experiment with the tennis sequence provided by the Ohio State University, and the car tracking experiment with the car sequence provided by Kalsruhe University. The face trcking experiment with highly noised images show that the object tracking method based on Fast Mean Shift has strong anti-jamming ability. A new fast color object detection technology based on characteristic color is established, which use characteristic color distribution to compute the characteristic color vector of any area in an image quickly. With the high performance search method, the fast object detection is achieved. At last, using object tracker based on Fast Mean Shift and color object detector based on characteristic color with the Kalman filter, PID controller, searial communication and other technologies, automatic object detection and tracking system with control system is built. The availability and anti-jamming ability of this system are verified by some object detection and tracking tests in different scenes.
本文对目标自动识别与跟踪进行了理论、计算、试验三方面的深入研究，主要包括：首次指出了目标跟踪技术中常用的均值迁移方法的本质为一种特殊的高斯-牛顿方法，改进了均值迁移方法步长取值保守的弱点，建立了快速均值迁移方法，证明了该方法的收敛性、有效性以及收敛速度优于均值迁移方法；进行了平面和3维随机分布数据集的最大概率密度搜索对比试验，试验结果表明，快速均值迁移方法大大减少了迭代次数；建立了基于快速均值迁移的目标跟踪方法，利用俄亥俄州立大学提供的乒乓球序列图像和卡斯鲁厄大学的汽车序列图像，对人脸和汽车目标跟踪性能分别进行了对比试验，并进行了高噪声人脸图像目标跟踪试验，结果表明，基于快速均值迁移的目标跟踪方法有效提高了目标跟踪性能，具有很强的抗干扰能力；建立了一种新型彩色目标自动识别方法，采用特征色彩分布函数实现了对任意图像区域特征色彩矢量的快速计算，建立了高效的搜索方法，实现了彩色目标的快速识别；将基于快速均值迁移方法的目标跟踪方法、基于特征色彩的目标识别方法与卡尔曼滤波、PID控制、串行通讯等技术结合，建立了带有控制系统的快速目标自动识别与跟踪系统，并在不同场景下进行了目标自动识别与跟踪试验，验证了快速目标自动识别与跟踪系统的有效性和抗干扰能力。
Discussed the random range and random angle realization, gave the jamming effect on certain ECM system.
给出了在某雷达对抗验证系统上的干扰效果图。
The random frequency agility and the random jitter of PRI may ensure the radar with strong abilities of anti-reconnaissance and anti-jamming.
随机频率捷变和脉冲重复周期随机抖动可以使雷达具有较强的抗侦察、抗干扰能力。
Study of countermeasures to deceptive jamming using random linear modulation frequency ratio SAR
随机线性调频斜率SAR抗欺骗干扰方法研究
The working principles and hardware implementation of the important parts are resolved. These include mainly recognition and reconstruction of pseudo-random code sequence, modulation and transmission of jamming waveform and so on.
重点解决了伪码序列的识别和重构、干扰波形的调制发射等关键部件的实现原理和硬件实现。
Research on Key Techniques and Engineering Application of Experimental Jamming Source System for Pseudo-random Code Phase-modulation Fuze
伪码调相引信实验干扰源系统关键技术及工程应用研究
Jamming and Anti-jamming of Pseudo-random Code Phase Modulation Fuze
伪码调相引信的干扰与抗干扰
In frequency hopping system, the carrier frequency of transmission signal is controlled by the pseudo-random sequence in order to improve the anti-jamming ability of the system.
在跳频系统内，通过伪随机序列对传输信号的载波频率进行控制，可提高系统的抗干扰能力。
Anti-jamming performance of high pulse repetition frequency tracking radar with random frequency hopping
高重频随机跳频跟踪雷达及其抗干扰性能
Correlated random series is the mainly tool for describing the property of random noise, clutter and jamming, which is widely used in satellite communications, normal radar and spaceborne radar.
相关随机序列是描述随机噪声、杂波和干扰的主要工具，在卫星通信、常规雷达及星载雷达中有着重要应用。
Moreover, the random phase hopping greatly enhances the security and anti-jamming of the system, improves the ability of resisting the burst error and deep fading.
同时，伪随机的相位跳变大大增强了系统的保密性及干扰对抗性，提高了系统抗突发错误和深度衰落的能力。
In chapter 5 the jamming such as phase modulation noise, binary pseudo random sequence and multiple pseudo targets are discussed.
第五章对雷达干扰进行了阐述，主要的干扰信号有连续噪声调相干扰、伪随机码噪声干扰、多假目标干扰。
The results show that the cracks nucleate at dislocations jamming at random boundary during deep-draw forming operation, and propagate along high energy continuous random boundary network, which lead to SWE of IF steels.
结果表明，在IF钢板的低温冲压成形过程中，位错在高能随机晶界处大量塞积而萌生微裂纹，随后裂纹沿着连续网状的高能随机晶界迅速扩展而导致IF钢板二次加工脆性现象；
The other is to generate jamming signals with adjustable modes and variable velocity such as no tracking jamming signals including single frequency, sweep-freqency and random frequency.
二是产生非跟踪式干扰信号，这包括单频、扫频、随机频率等样式可调、速率可变的干扰信号。