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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Effects of PRN-Dependent ACF Deviations on GNSS-R Wind Speed Retrieval
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Effects of PRN-Dependent ACF Deviations on GNSS-R Wind Speed Retrieval

机译:PRN依赖的ACF偏差对GNSS-R风速获取的影响

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In global navigation satellite systems reflectometry (GNSS-R), the autocorrelation property of the transmitted GNSS signal is an important factor in the delay-Doppler map of the scattered power. The autocorrelation functions (ACFs) of the GPS Level 1 (L1) coarse/acquisition signals exhibit sidelobes. For some of the pseudorandom noise (PRN) codes, the high-amplitude sidelobes are located within one chip from the main lobe and, thus, broaden or narrow its width. These PRN-dependent ACF deviations can introduce significant biases into the GNSS-R scatterometric observables and the wind speed measurements. Simulation results for Cyclone GNSS (CYGNSS) mission show that the ACF deviation induced wind speed error can be larger than 10% (e.g., 2-3 m/s for 20 m/s and 7-8 m/s for 40 m/s wind speeds). These effects can be corrected efficiently by applying empirical factors on the CYGNSS Ll observables.
机译:在全球导航卫星系统反射法(GNSS-R)中,发射的GNSS信号的自相关特性是散射功率的延迟多普勒图中的重要因素。 GPS级别1(L1)粗略/采集信号的自相关函数(ACF)表现出旁瓣。对于某些伪随机噪声(PRN)码,高振幅旁瓣位于距主瓣一个码片内,因此加宽或变窄了其宽度。这些依赖于PRN的ACF偏差可能会在GNSS-R散射观测和风速测量中引入明显的偏差。 Cyclone GNSS(CYGNSS)任务的仿真结果表明,ACF偏差引起的风速误差可能大于10%(例如,对于20 m / s,为2-3 m / s;对于40 m / s,为7-8 m / s风速)。通过将经验因素应用于CYGNSS L1可观察物,可以有效地校正这些影响。

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