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LXI in satellite system testing

机译：LXI在卫星系统测试中

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Satellites are used for a wide range of military/aerospace applications including weather prediction, navigational and communications. Since performance of satellite systems is highly dependent upon transmission quality and therefore achieving constant magnitude and linear phase response constant group delay (that is derived from the phase) versus frequency of the transmission coefficient within the used frequency band. Test engineers must find a reliable way to measure group delay where the transmitters and receivers are geographically separated from one another, as well as from their controller, by significant distances. A new two-tone method that makes use of LXI technology has been developed that allows users to measure relative group delay with high precision on converters and mixers without Local Oscillator (LO) access as is typically the case in satellite communication systems. In this case, the phase of the transmission coefficient cannot be measured directly because the input and the output signal have different frequencies. Moreover, the phase of the output signal is influenced, not only by the device under test (DUT), but also by the frequency and phase drift of its local oscillator. Additionally, in the case where input and output of the transmission system are located far apart, the group delay and phase are very difficult to measure. This paper describes how to measure group delay on a transmission system by means of two LXI based network analyzers, one at the transmitting end and the other at the receiving end, that communicate with one another using LXI peer-to-peer LAN messages. Based upon widely used standards such as Ethernet and the Web, the LXI standard enables the connection of intelligent instrumentation which supports distributed processing of measurement data and provides a high bandwidth interconnect system for supporting applications with high data demands.
机译：卫星被广泛用于军事/航空应用，包括天气预报，导航和通信。由于卫星系统的性能高度依赖于传输质量，因此，在所使用的频带内，相对于传输系数的频率，要获得恒定的幅度和线性相位响应，恒定的群时延（从相位中得出）。测试工程师必须找到一种可靠的方法来测量群时延，在这种情况下，发射器和接收器以及它们的控制器在地理位置上要相距很远。已经开发出一种利用LXI技术的新的两音调方法，该方法允许用户在没有本地振荡器（LO）访问的情况下，以高精度测量转换器和混频器上的相对群时延，这在卫星通信系统中通常是这样。在这种情况下，由于输入和输出信号的频率不同，因此无法直接测量传输系数的相位。此外，输出信号的相位不仅受到被测器件（DUT）的影响，还受到其本地振荡器的频率和相位漂移的影响。另外，在传输系统的输入和输出相距很远的情况下，群时延和相位很难测量。本文描述了如何通过两个基于LXI的网络分析仪来测量传输系统上的群时延，一个在发送端，另一个在接收端，它们使用LXI对等LAN消息相互通信。基于广泛使用的标准（例如以太网和Web），LXI标准实现了智能仪器的连接，该仪器支持对测量数据的分布式处理，并提供了高带宽互连系统，以支持具有高数据需求的应用。

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