Relative navigation is a key feature in the joint tactical information distribution system(JTIDS).A parametric message passing algorithm based on factor graph is proposed to perform relative navigation in JTIDS.Firs...Relative navigation is a key feature in the joint tactical information distribution system(JTIDS).A parametric message passing algorithm based on factor graph is proposed to perform relative navigation in JTIDS.First of all,the joint posterior distribution of all the terminals' positions is represented by factor graph.Because of the nonlinearity between the positions and time-of-arrival(TOA) measurement,messages cannot be obtained in closed forms by directly using the sum-product algorithm on factor graph.To this end,the Euclidean norm is approximated by Taylor expansion.Then,all the messages on the factor graph can be derived in Gaussian forms,which enables the terminals to transmit means and covariances.Finally,the impact of major error sources on the navigation performance are evaluated by Monte Carlo simulations,e.g.,range measurement noise,priors of position uncertainty and velocity noise.Results show that the proposed algorithm outperforms the extended Kalman filter and cooperative extended Kalman filter in both static and mobile scenarios of the JTIDS.展开更多
联合战术信息分发系统(Joint Tactical Information Distribution System,简称JTIDS)采用组合调制体制和多层编码体系保证报文传输的可靠性。分析了JTIDS数据链在莱斯衰落信道环境下的抗干扰性能,并通过仿真分析了该系统在部分频带干扰...联合战术信息分发系统(Joint Tactical Information Distribution System,简称JTIDS)采用组合调制体制和多层编码体系保证报文传输的可靠性。分析了JTIDS数据链在莱斯衰落信道环境下的抗干扰性能,并通过仿真分析了该系统在部分频带干扰下的符号误码率和报文丢失率。仿真结果显示,由于JTIDS系统将RS编码、交织等多种编码技术和DS/FFH MSK调制技术相结合,使其在复杂信道环境下保持较低的符号误码率及报文丢失率,满足数据链报文传输可靠性的要求。展开更多
联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)是美军C4ISR系统的核心组成部分。它采用RS编码、循环码移键控调制(Cyclic Code-Shift Keying,CCSK)、跳频MSK波形调制等相结合的技术体制。通过对该技术...联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)是美军C4ISR系统的核心组成部分。它采用RS编码、循环码移键控调制(Cyclic Code-Shift Keying,CCSK)、跳频MSK波形调制等相结合的技术体制。通过对该技术体制进行研究,分析了JTIDS数据链采用相干解调方式在莱斯衰落信道环境下传输性能,研究并得出了JTIDS系统在莱斯衰落信道下的报文符号错误概率,并应用Matlab仿真工具对JTIDS系统进行了链路级仿真;仿真结果符合JTIDS性能特性,验证了理论分析的正确性。为后续建立JTIDS网络仿真平台,评估JTIDS系统通信网络性能提供了理论依据。展开更多
联合战术信息分发系统(Joint tactical information Distribution System)作为现阶段乃至未来复杂电磁环境下战场主要的信息分发系统,在战争中将会起到决定性支撑作用,主要体现在系统信息传输性能强大、作战组网灵活及通信组网稳固三个...联合战术信息分发系统(Joint tactical information Distribution System)作为现阶段乃至未来复杂电磁环境下战场主要的信息分发系统,在战争中将会起到决定性支撑作用,主要体现在系统信息传输性能强大、作战组网灵活及通信组网稳固三个方面;同时在战争中也将会成为敌方干扰和攻击的首要目标,因此分析其防护性能对提高系统信息传输性能,进而更好发挥数据链作战支撑作用具有重要意义。展开更多
根据联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)信号的特点,提出一种基于多相滤波的JTIDS信号接收方法。该接收模型具有全概率接收JTIDS信号的特点,而且所需计算复杂度低。在信号接收后,通过能量检...根据联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)信号的特点,提出一种基于多相滤波的JTIDS信号接收方法。该接收模型具有全概率接收JTIDS信号的特点,而且所需计算复杂度低。在信号接收后,通过能量检测对输出信号进行脉冲宽度检测,判断信号是否为JTIDS信号。仿真结果表明该方法在信噪比为正时具有较好的性能。展开更多
基金supported by the National Natural Science Foundation of China(6120118161471037+1 种基金61571041)the Foundation for the Author of National Excellent Doctoral Dissertation of China(201445)
文摘Relative navigation is a key feature in the joint tactical information distribution system(JTIDS).A parametric message passing algorithm based on factor graph is proposed to perform relative navigation in JTIDS.First of all,the joint posterior distribution of all the terminals' positions is represented by factor graph.Because of the nonlinearity between the positions and time-of-arrival(TOA) measurement,messages cannot be obtained in closed forms by directly using the sum-product algorithm on factor graph.To this end,the Euclidean norm is approximated by Taylor expansion.Then,all the messages on the factor graph can be derived in Gaussian forms,which enables the terminals to transmit means and covariances.Finally,the impact of major error sources on the navigation performance are evaluated by Monte Carlo simulations,e.g.,range measurement noise,priors of position uncertainty and velocity noise.Results show that the proposed algorithm outperforms the extended Kalman filter and cooperative extended Kalman filter in both static and mobile scenarios of the JTIDS.
文摘联合战术信息分发系统(Joint Tactical Information Distribution System,简称JTIDS)采用组合调制体制和多层编码体系保证报文传输的可靠性。分析了JTIDS数据链在莱斯衰落信道环境下的抗干扰性能,并通过仿真分析了该系统在部分频带干扰下的符号误码率和报文丢失率。仿真结果显示,由于JTIDS系统将RS编码、交织等多种编码技术和DS/FFH MSK调制技术相结合,使其在复杂信道环境下保持较低的符号误码率及报文丢失率,满足数据链报文传输可靠性的要求。
文摘联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)是美军C4ISR系统的核心组成部分。它采用RS编码、循环码移键控调制(Cyclic Code-Shift Keying,CCSK)、跳频MSK波形调制等相结合的技术体制。通过对该技术体制进行研究,分析了JTIDS数据链采用相干解调方式在莱斯衰落信道环境下传输性能,研究并得出了JTIDS系统在莱斯衰落信道下的报文符号错误概率,并应用Matlab仿真工具对JTIDS系统进行了链路级仿真;仿真结果符合JTIDS性能特性,验证了理论分析的正确性。为后续建立JTIDS网络仿真平台,评估JTIDS系统通信网络性能提供了理论依据。
文摘联合战术信息分发系统(Joint tactical information Distribution System)作为现阶段乃至未来复杂电磁环境下战场主要的信息分发系统,在战争中将会起到决定性支撑作用,主要体现在系统信息传输性能强大、作战组网灵活及通信组网稳固三个方面;同时在战争中也将会成为敌方干扰和攻击的首要目标,因此分析其防护性能对提高系统信息传输性能,进而更好发挥数据链作战支撑作用具有重要意义。
文摘根据联合战术信息分发系统(Joint Tactical Information Distribution System,JTIDS)信号的特点,提出一种基于多相滤波的JTIDS信号接收方法。该接收模型具有全概率接收JTIDS信号的特点,而且所需计算复杂度低。在信号接收后,通过能量检测对输出信号进行脉冲宽度检测,判断信号是否为JTIDS信号。仿真结果表明该方法在信噪比为正时具有较好的性能。
文摘战术数据链系统能够提高部队信息化作战能力,其中信道编码技术是保证消息传输可靠性的关键技术之一.构建了一种新的战术数据链系统,系统采用低密度奇偶校验(LDPC,Low-Density Parity-Check)码方案,LDPC码是适用于传输可靠性要求高的通信系统的新型码组.介绍了LDPC码方案中的和积算法,描述了系统的传输模型,分析了系统在固定频率和加性白色高斯噪声(AWGN,Additive White Gaussian Noise)信道条件下的链路性能.利用计算机进行蒙特卡罗仿真,结果表明:在AWGN信道和瑞利衰落信道下,LDPC编码方案可以有效地降低数据链系统的误比特率,取得比采用里德.所罗门编码的联合战术信息分发系统更好的误码性能.LDPC码作为信道编码技术的备选码组,为进一步提高战术数据链的可靠性提供了一种解决方案.