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应用文章
Introduction
Regenerative payloads pose challenges not found in conventional analog bent-pipe satellite testing. There are two major reasons for this. First, these are mixed-signal systems that carry analog and digital representations of modulated signals. Second, the digital modulation formats may be wideband, higher-order or custom.
The process of understanding what happens along the signal chain will benefit from continuity across design, simulation, signal generation and signal analysis. Achieving a high level of continuity across an integrated design-to-test flow will help reduce risk during the actual system-integration process.
This application note focuses on solutions for the issues that create risks in the integration of such systems. The necessary measurements can be achieved with a combination of software and hardware tools: Keysight SystemVue with the companion digital modem library and Keysight 89600 VSA software; the Keysight M8190A arbitrary waveform generator (AWG), the Keysight E8267D PSG vector signal generator, the Keysight Infiniium 90000 Q-Series oscilloscope and the Keysight 16850 Series logic analyzer with the FPGA Dynamic Probe application. Examples focus on measurements of error vector magnitude (EVM), which is a key figure of merit for modulated signals implemented in either analog or digital form.
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