| Citation: | YU Xiaolong, KOU Yanhong. Simulation of analog distortion of dual-frequency multiplexing signal generated by navigation satellite[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(5): 1048-1055. doi: 10.13700/j.bh.1001-5965.2017.0334(in Chinese)
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The non-ideal components of the signal generator of a navigation satellite payload can distort the transmitted signal. On the one hand, no applicable analytical model about the ranging performance loss caused by such signal distortions has been established by far. On the other hand, the existing simulation studies about the analog distortions of wide-band dual-frequency multiplexing signals are not quite comprehensive. Taking the correlation loss, S-curve bias, and carrier phase bias as evaluation index, this paper simulates and evaluates the effects of the payload analog components including the high power amplifier (HPA), pre-HPA filter, and output multiplexer (OMUX) on the ranging performance of 4 different dual-frequency multiplexing modulations including AltBOC, TD-AltBOC, ACEBOC and AltLOC. In the simulation, we employ a memory behavioral model of HPA instead of a memoryless model, taking the effects of different pre-HPA filter bandwidth and HPA operating points into account. In addition, the performance loss of the distorted signal relative to the ideal signal is evaluated for both the double sideband and the single sideband pilot tracking methods. The study provides a useful reference for not only the comparison and evaluation of different signal modulation schemes but also the optimization design of the payload signal generator.
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