文中实现了一种TDRSS信号模拟器,可应用于相控阵系统地面部分射频通道特性测试与补偿.文中对适合该模拟器的信号特性校准方法进行了有效研究,介绍了其组成以及工作流程.所研究校准方法性能满足地面部分波束合成要求,并已得到实际验证.

To make beamforming better, the phase array antenna (PAA) was needed to be calibrated. A series of algorithms and systems were proposed for that now, for an instance, REV, CCE and UTE and so on were proposed for PAA. A fast Calibration System was proposed in the paper, whose structure and process were introduced. The new system calibrated the PAA by using beamforming method, which was help to fulfill the calibration process in a much shorter time than REV. It’s testified that the new one was more preferred in practice.

Considering that the interference ranges of nodes are always large and the propagation delays are variable and long in Underwater Acoustic Sensor Networks (UW-ASNs), in this paper, we propose two novel Autonomous Underwater Vehicle aided token-based data collection protocols to minimize the total delay for multi-hop UW-ASNs. They have been proven to be constant factor approximations to the optimal solution for minimum delay data collection in UW-ASNs.

Propagation of sound in the ocean medium is anisotropic, rendering those traditional routing protocols that purely use distances as the metric to select the best routes no longer energy-efficient. In this paper, considering that underwater acoustic sensor networks (UASNs) are powered by batteries which are costly to recharge or replace, we re-define nodes’ one-hop neighbors based on signal attenuation rather than geographical distance, and design a distributed energy-efficient routing protocol for UASNs. Further, the optimal transmission loss threshold has been theoretically derived, and a routing protocol based on this threshold has been designed. Results show that our transmission loss threshold based routing policy consistently outperforms the shortest path policy, and gives similar performance to the optimal one in several scenarios.

The comprehensive management, optimized organization and cooperative detection control of a sensor system is important for improving the operational ability of a naval formation. By studying the management and control architecture, the information management, the mission planning method and the mission deconflicting technology of sensors, technologies for sensor management of the naval formation are described to improve the ability of the naval formation to discover, track and identify targets.

文章介绍了一种用于研究定位信息系统中信息流转过程的仿真机制,重点讨论了定位信息系统的仿真过程,详细描述了运行、初始化、评估和调试等仿真状态的迁移过程.

文中介绍了一种基于消息的分布信息处理系统仿真技术,重点讨论了仿真框架的体系结构、仿真代理和仿真运行的决策控制.该仿真机制采用规范化的消息实现时间和事件同步,协调整个系统的仿真运行,仿真运行过程中仿真单元闻流转的信息是真实的,十分适于做复杂大型信息处理系统的分析研究平台.