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本文介绍了由船用导航雷达(RADAR)和安装在救生艇(筏)上的搜索营救雷达应答器(SART)组成的海上搜救寻位系统。阐述了系统的工作原理,并对SART的一些主要指标和误差,进行了较为深入的分析和论证。最后,指出了SART的应用前景。 相似文献
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为解决自动导引车（Automated Guided Vehicle, AGV）的定位精度问题，以国内某在建的自动化集装箱码头为工程背景，研究与基于磁钉技术的AGV定位误差相关的因素.通过给出AGV惯性导航系统的运动方程和误差方程，按照工程实况，在忽略陀螺仪影响的基础上，得到AGV惯性导航系统位置误差的理论计算式.依此指出，基于磁钉技术的AGV组合导航系统定位精度与加速度计精度、AGV 运行方向的余弦、磁钉数据更新时间的平方成正比例关系.最后，对某工程算例进行数值仿真，验证了理论分析的正确性.该方法对磁钉排布、惯性导航系统传感器选型等有参考意义. 相似文献
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The most dominant error source for microwave ranging is the frequency instability of the oscillator that generates the carrier phase signal. The oscillator noise is very difficult to filter due to its extremely low frequency. A dual transponder carrier ranging method can effectively minimize the oscillator noise by combing the reference phase and the to-and-fro measurement phase from the same single oscillator. This method does not require an accurate time tagging system, since it extracts phases on the same satellite. This paper analyzes the dual transponder carrier ranging system by simulation of the phase measurements with comprehensive error models. Both frequency domain and time domain noise transfer characteristics were simulated to compare them with dual one-way ranging. The simulation results in the two domains conformed to each other and demonstrated that a high level of accuracy can also be achieved by use of the dual transponder carder ranging system, with relatively simple instruments. 相似文献
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李飞敏 《黄冈师范学院学报》2007,27(6):58-62
介绍了卫星电视信号的上行发射、星载转发和下行接收,并讨论了卫星电视信号下行接收天线焦距、极化方式、方位角和仰角的计算公式与调试方法。 相似文献
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