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无人机测控与信息传输有关系统问题探讨 总被引:2,自引:0,他引:2
测控与信息传输系统是无人机系统的重要组成部分,按照作用距离,系统可以分为微型无人机、极近程无人机、短程无人机、远程无人机的测控与信息传输系统。对系统设计中的有关系统问题进行了探讨,包括频率资源如何利用、测控和通信功能怎样综合以及系统的技术体制如何选择等。 相似文献
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本文简要说明在CATV系统中采用相关频率配置的好处,并在与"增量相关载波"(IRC)频率配置进行比较后,提出了在我国CATV系统中采用"谐波相关载波"(HRC)频率配置方案的建议。还提出在HRC频率配置基础上增加载频相位调整功能,以减小系统的交调失真。避开几个FM频率的使用以减小FM受HRC频率配置的影响。 相似文献
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本刊讯 (通讯员 牛若歆)2013年8月10日,由工业和信息化部无线电管理局指导、国家无线电频谱管理研究所(简称"国家频研所")主办,陕西省无线电管理委员会办公室、西北工业大学无人机特种技术国家重点实验室承办的我国"无人机系统频率规划研讨会"在西安市国家频研所召开.工信部无线电管理局频率规划处调研员常若艇、国家频研所书记霍刚,无人机测控和通信链路、无人机研制单位、无人机情报收集及分类等领域的专家20余人出席了研讨会. 相似文献
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无人机视距数据链的信道特性与扩频技术 总被引:2,自引:2,他引:0
无人机视距数据链的信道类型主要是一个干涉型平衰落信道,但也可能发生频率选择性衰落、时间选择性衰落。限于无人机的使用特点和条件,视距数据链不同于一般通信系统,不适于极高的通信可靠度,也不要求很大的衰落储备。分析了扩频系统在无人机视距数据链中的特殊性并给出了解决方法。 相似文献
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鲍泳林 《太赫兹科学与电子信息学报》2015,13(6):903-907
无人机(UAV)飞控系统地面半实物仿真平台用于对无人机飞控系统进行相关地面测试。针对某无人机飞行控制系统,提出了一种基于MATLAB实时工作空间和VxWorks实时操作系统的地面半实物仿真平台方案。针对无人机小扰动数学模型,构建了地面站上位机、控制器和模型机组成的实时系统闭环回路,对硬件及软件配置进行了说明,并设计了相关控制算法。该试验台可实时监测无人机系统状态,并可实时对模型注入扰动,实现系统在线调参。该半物理仿真平台结构简洁,功能明确,为相关控制律提供了便捷的研究设计手段。 相似文献
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提高无人机系统抗电磁干扰能力,是适应信息化战争复杂战场电磁环境的必然要求。分析了传统无人机接收前端的不足,在此基础上,介绍了一种YIG调谐的、能够有效抑制干扰的高频接收前端的实现方法,并给出了设计方案及关键技术。该射频前端特有的超宽带,不仅包括了多个型号现役无人机的工作频带,而且其多通路窄带控制模式,以及其适应恶劣环境温度的特性,都极大地提高了无人机的多系统兼容能力。 相似文献
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Delfour M.C. De Couvreur G.A. 《Electromagnetic Compatibility, IEEE Transactions on》1989,31(3):280-292
A mathematical method using linear algebra is developed for generating interference-free simplex channel assignment grids for base stations in the VHF land mobile band for large urban areas. The frequency assignment model checks for interference from adjacent channels, desensitization, transmitter intermodulation, and receiver intermodulation. The basic philosophy of the model is presented, and the required electromagnetic compatibility computations are reviewed. Both single-frequency and multiple-frequency (sharing) assignment strategies are described 相似文献
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Alireza Ghassempour Hamidreza 《AEUE-International Journal of Electronics and Communications》2005,59(7):401-409
The channel assignment is an important aspect of cellular radio networks. Because of the limitations on the frequency spectrum, the optimal or near-optimal channel assignment has become an essential part of the network operations of wireless personal communication systems. We formulate a new strategy for the channel assignment problem in agreement with the electromagnetic compatibility constraints. We introduce and formulate the extended dynamic programming (EDP), as an extension of dynamic programming for solving the channel assignment problem in a cellular system. Using EDP an algorithm is developed for fixed channel assignment problem and it is tested and compared with other existing methods by solving different problems. In agreement with electromagnetic compatibility constraints, solution strategy based on EDP algorithm finds many valid solutions with minimum possible bandwidth. 相似文献
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为了研究无人机在战场电磁环境下的安全性及可靠性,对无人机壳体的屏蔽效能进行了仿真计算,并在开阔场环境下建立连续波电磁辐照系统,利用连续波电磁辐照系统对无人机整机和通信链路核心部件收发组合进行辐照效应实验。仿真结果表明,在10MHz ~1GHz 连续波作用下,无人机壳体的屏蔽效能较低,为10dB 左右;实验结果表明,在某些频点或频段,无人机会出现通信链路中断的现象,表现为失锁状态,即无人机不能与地面控制站进行有效的数据传输,且不同的辐射场极化方向导致出现失锁现象的电场阈值不同。分析表明,电磁能量进入无人机机体内部产生干扰的主要耦合途径为无人机天线和无人机壳体的透射。 相似文献
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针对战场环境下复杂传播环境及敌方干扰对无人机通信系统性能的影响,提出了综合信道衰落和干扰共同作用下的无人机通信信道理论模型。在此基础上,基于微波暗室设计实现了无人机通信干扰电磁环境半实物仿真系统。该系统利用硬件现场可编程门阵列(Field Programmable Gate Array,FPGA)实时模拟无人机通信信道和干扰信号,利用微波暗室模拟外场的无线传播环境,并通过天线位置和角度调节装置模拟发射机、干扰机和接收机之间的空间位置特性。实测结果表明,该半实物仿真系统能够真实复现无人机通信干扰电磁环境,可用于无人机数据链抗干扰性能的测试和评估。 相似文献
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应用WSEIAC武器系统作战效能模型给出了单架反辐射无人机的作战效能表达式,分析了影响反辐射无人机作战效能的关键因素,推导了多架反辐射无人机的作战效能表达式,并针对多架反辐射无人机的作战效能分析了攻击资源的分配。 相似文献
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有人或者无人飞行器数据链需具有很强的抗干扰和多套系统兼容工作能力。在分析跳频系统多套系统兼容工作性能的基础上,给出了一种采用跳频技术的抗干扰数据链路设计方案,并对其性能进行了分析和仿真。仿真结果表明,该方案具有抗干扰能力强、传输速率范围宽、一对多以及多套系统的兼容工作等特点,可以满足有人或无人飞行器抗干扰数据传输的需求。 相似文献
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In this article, an analytical method for radar electromagnetic compatibility (EMC) in complex environment is proposed to deal with the radar system-level EMC problem. The complete procedure of this method includes two steps: multi-coupling paths model and assessment methodology. In the first step, several coupling paths are mainly considered based on the electromagnetic topology (EMT) analysis with numerical calculation method, to get the interference from external and internal environment. The coupling coefficients are calculated to get the coupling power. The second step is to evaluate and quantify the effect of interference on radar performance. The radar EMC assessment methodology with the role of radar distance attenuation model is further presented. As a result, this process can easily get the influence to each radar and all radars from different paths and sources in same frequency band, even the radar system in different frequency bands. The rationality and flexibility of every step in this method is validated with other methods. 相似文献
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《Electromagnetic Compatibility, IEEE Transactions on》1964,6(2):36-44
Transmitter power is a fundamental parameter with respect to the performance of electromagnetic equipment, determining the strength of signals that may be either desired or undesired at particular receivers. The rational assignment of power output to transmitters for which this is a controllable variable is one method of enhancing compatibility in congested electromagnetic environments. It is shown here that the power assignment problem can be formulated mathematically as a linear programming problem. Efficient algorithms for obtaining optimum solutions to such problems are known; with computer implementation systems composed of many transmitters and receivers can be treated. A small-scale field test in which communication equipment was operated in accordance with the concept of optimum power assignment by linear programming has confirmed the basic validity of the approach. 相似文献