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Characterizing Background Signals and Noise in Spaceborne GNSS Reflection Ocean Observations

机译:在空间出版物的背景信号和噪声表征麦克风反射海洋观测

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This letter analyzes the background signals and thermal noise received over ocean scenes in spaceborne global navigation satellite system (GNSS)-reflectometry (GNSS-R) remote sensing using observations from the cyclone GNSS (CYGNSS) constellation. The measured noise floor contains a stable and predictable radiometric thermal noise component and a more variable background signal component from unintended specular reflections within the CYGNSS receive antenna pattern from all GNSS satellite constellations (GPS, Galileo, GLONASS, Beidou, and all SBAS). The presence of SBAS reflections, in particular, is evident in the noise floor measurements, especially the U.S. wide area augmentation system (WAAS) satellites. The results show that the impact is negligible, since background signal contributions by other GNSS transmitters affect both the "signal" and "noise" portions of CYGNSS's delay Doppler map measurements, and therefore cancel when the measured noise floor is subtracted from the desired signal. The potential increase in measurement uncertainty introduced by any residual background signal to the CYGNSS calibration is analyzed.
机译:这封信分析了在星球上的全球导航卫星系统(GNSS)的海洋场景上接收的背景信号和热噪声 - 使用来自旋风通孔(Cygnss)星座的观测来遥感。测量的噪声底板包含稳定且可预测的辐射热噪声分量,并且来自CyGNSS中的意想不到的镜面反射的更可变的背景信号分量,从所有GNSS卫星星座(GPS,伽利略,Glonass,北斗和所有SBA)接收天线图案。特别是SBAS反射的存在在噪声底板测量中是明显的,特别是美国广域宽面积增强系统(WAAS)卫星。结果表明,由于其他GNSS发射机的背景信号贡献影响CyGNSS的延迟多普勒映射测量的“信号”和“噪声”部分,因此当测量的噪声底板从所需信号中减去测量的噪声底板时,从而减少。分析了任何残留的背景信号引入的测量不确定性的潜在增加,对CYGNSS校准引入。

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