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本文对测量站外测的码分多址,多站共作应答机测距方式中的远近电平效应问题,结合靶场的实际使用情况进行了具体分析。 相似文献
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RFID security 总被引:2,自引:0,他引:2
Radio Frequency Identification (RFID) systems have become popular for automated identification and supply chain applications. This article describes the technical fundamentals of RFID systems and the associated standards. Specifically, we address the security and privacy aspects of this relatively new and heterogeneous radio technology. We discuss the related security requirements, the threats and the implemented mechanisms. Then the current security and privacy proposals and their enhancements are presented. Finally we discuss the role of this technology in Ubiquitous Computing. 相似文献
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提高应答机测距精度的环节与测量技术探讨 总被引:3,自引:2,他引:1
本文提出了提高飞行器载应答机测距精度的方法与思路,并对一些典型误差源进行了定性的分析。 相似文献
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阐述了箭(弹)载连续波相参应答机机内由于电磁干扰(EMI)而产生锁相环虚假锁定的机理以及消除方法。 相似文献
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Izhak Tamir Yigal Rappaport 《International Journal of Satellite Communications and Networking》1987,5(1):49-56
A generalized model for the satellite link that includes non-linear effects is presented. The transponder is handled as a black box with nominal gain gs. At a specific operating point each signal in the transponder has its own gain, gsci, that may be different from gs. The parameter gsci depends on the operating point of the transponder, the power of the signal and the distribution of the residual transponder power among the other carriers. The intermodulation between the carriers and between them and the up-link noise is included in the model as well. The generalized model is represented by the conventional traditional equation, modified with correction factors which account for the nonlinear effects. Application of the model to typical transmission plans is given and comparison of the results to field experiments and transponder analysis program is included. Emphasis is placed on the use of the transponder with mixed TV and SCPC operation. 相似文献
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本文在原单信道连续波相参转发应答机的基础上,提出了一种瓣的模式,以适应宽频带,低相噪相参转发应答机的要求,并加以论证分析。 相似文献
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