排序方式: 共有32条查询结果,搜索用时 31 毫秒
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DAB发射机系统的研究与设计 总被引:1,自引:0,他引:1
基于软件无线电思想,提出了一个数字音频广播发射机的设计方案.在介绍系统基本概念的基础上,从MUSICAM信源编码开始,逐步介绍卷积编码、时间交织、DQPSK调制、频率交织和OFDM信号的形成,最终给出完整的软件流程和硬件设计方案,并对系统性能和可行性进行了分析. 相似文献
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在分析和讨论了通导设备AIS的发射技术的基础上,分别就时分多址、时域和频域层面说明信道的有限性和电磁辐射特性。然后针对船舶终端的只收不发的需求,提出三个解决方案。 相似文献
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相位测试技术可满足不同外形天线罩的在线测试需求。通过数值仿真,设计最佳变换曲线完成矩形
传输波导与圆形辐射天线的拟合连接,能够有效降低天线驻波比,实现测试探头的高增益收发,提升测试有效性。
在维持驻波比参数前提下,对天线口面弧线给予二次曲率调整,可以适应不同外形天线罩的测试稳定性要求。根据
仿真结果加工的低驻波比反射相位测试天线,已应用于多个型号天线罩成型中的相位在线测试,提高了监控的有效
性,验证了设计仿真结果的正确性。 相似文献
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Yashvir Singh Paramvir Singh Abhishek Sharma Praveen Choudhary Amneesh Singla Nishant Kumar Singh 《Egyptian Journal of Petroleum》2018,27(4):1145-1155
The escalating prices, rapid diminution of fossil fuels, tenacious regulations of the authorities, etc. enforced towards the alternate biogenic fuel for lubrication. The present study assessed the lubricity characteristics of Phyllanthus Emblica seed oil based lubricants by using a pin on disc (POD) tester. The design of experimentations has been carried out using response surface methodology (RSM). The value of parameters such as blend ratio, load and sliding speed ranges from 0 to 20%, 50 to 100?N and 1.3 to 3.8?m/s, respectively, are used to assess the value of specific wear rate (SWR) and coefficient of friction (COF). Test results illustrate that the adhesive wear occurred during the experiments. It has been observed that AB10 shows the probable results in terms of wear and friction characteristics as compared to other lubricant variants at low load and high sliding velocity conditions and perform as an excellent lubricant additive. This contributes towards the replacement of petroleum based lubricants. Analytical ferrography and total acid number (TAN) analysis of the used oil was also done to study the wear debris in the oil. 相似文献
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针对现有文献对基于独轮机器人的动力学方程得到的状态空间方程有较多不足,其为了简化计算忽略了很多耦合因素的影响,导致系统不可控的问题,在深入分析独轮机器人动力学方程的基础上得到了其状态空间方程,并对各耦合项系数进行修正,确保了系统的可控性.通过设计LQR控制器实现了对独轮机器人的自平衡及偏航控制,并通过仿真和物理实验进行验证,设计了抗干扰实验.结果表明:所得出的状态空间方程是正确的. 相似文献