上边带同步化概念的仪器级验证
Instrument-Level Validation of Upper Sideband Syntonization Concept
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中文总结 AI 辅助
本文通过W波段互相关测量和成像，首次端到端验证了欧空局提出的上边带同步化概念，证明其可保持干涉相干性，性能接近共用本振。
中文摘要 AI 辅助
上边带同步化（USBS）是一种由欧洲空间局提出的双向频率传递概念，用于分布式空间射电干涉测量系统。以往的研究主要通过频率稳定性和相位传递测量来验证该概念。本研究通过相干W波段互相关测量和图像重建，首次展示了USBS概念的端到端仪器级验证。一个P=2的USBS面包板与为此测试开发的W波段射电干涉仪集成。通过长期互相关测量和点状噪声源的相干成像，对同步的本振（LOs）进行了评估。结果与使用常规共用本振以及两个独立自由运行本振所获得的结果进行了比较。由USBS导出的本振在约五天历时内累计500秒的有效积分时间内保持了相干性，并在跨越40天的测量中保持了会话间的相位稳定性。重建图像与使用共用本振获得的图像几乎无法区分，而独立自由运行本振则导致严重的相干性退化、图像失真以及约38 dB的峰值响应损失。结果表明，USBS保持了W波段成像所需的干涉相干性，并为未来分布式空间射电干涉任务提供了USBS同步化概念的首次端到端仪器级验证。
英文摘要
Upper Sideband Syntonization (USBS) is a two-way frequency-transfer concept proposed by the European Space Agency for distributed space radio interferometric systems. Previous investigations validated the concept primarily through frequency-stability and phase-transfer measurements. This work demonstrates the first end-to-end instrument-level validation of the USBS concept through coherent W-band cross-correlation measurements and image reconstruction. A P=2 USBS breadboard was integrated with a W-band radio interferometer developed for this test. The synchronized local oscillators (LOs) were evaluated through long-term cross-correlation measurements and coherent imaging of a point-like noise source. The results were compared with those obtained using a conventional common LO as well as two independent free-running LOs. The USBS-derived LOs maintained coherence over 500 s of cumulative effective integration time acquired over approximately five days of elapsed time and preserved inter-session phase stability over measurements spanning 40 days. The reconstructed image is nearly indistinguishable from that obtained with a common LO, whereas independent free-running LOs lead to severe coherence degradation, image distortion, and approximately 38 dB loss of peak response. The results demonstrate that USBS preserves the interferometric coherence required for W-band imaging and present the first end-to-end instrument-level validation of the USBS syntonization concept for future distributed space radio interferometric missions
发表机构
- Serco Nederland B.V.（瑟科荷兰有限公司）
- European Space Research and Technology Centre (ESTEC)（欧洲空间研究与技术中心）
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