Distributed sensing of ionospheric irregularities with a GNSS receiver array
Distributed sensing of ionospheric irregularities with a GNSS receiver array
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使用 GNSS 接收器阵列对电离层不规则性进行分布式传感
DOI：
10.1002/2017rs006331
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发表时间：
2017
期刊：
影响因子：
1.6
通讯作者：
K. Deshpande
中科院分区：
文献类型：
--
作者：
Yang Su;S. Datta‐Barua;G. Bust;K. Deshpande
我们目前的分析方法研究的结构和运动的电离层不规则性在亚公里尺度的大小，产生L波段的闪烁。间隔接收器方法首次用于全球导航卫星系统（GNSS）接收器在大约千米到千米长度基线上的相位测量。这些技术估计的数量是等离子体漂移速度，衍射各向异性的大小和方向，和特征速度。通过对相位信号上的噪声进行集成模拟，将非线性量化到间隔接收器线性系统的观测值。这些协方差，然后传播到漂移的不确定性，通过线性化的状态估计值。闪烁极光全球定位系统阵列（佐贺）的五个接收器为L1频率的每个通道提供100 Hz的功率和相位数据。该阵列位于阿拉斯加扑克平原研究范围的极光区。一个由阵列观测的单颗卫星的案例研究被用来演示间隔接收器和不确定性估计过程。第二个案例研究估计了多个测量通道测量的漂移。根据全天空相机图像，这些极光与极光活动相关。在30分钟的时间内进行的测量和不确定性估计进行比较，并在水平漂移速度和方向的特征速度小于漂移速度的闪烁期间，并显示良好的协议。
We present analysis methods for studying the structuring and motion of ionospheric irregularities at the subkilometer scale sizes that produce L band scintillations. Spaced‐receiver methods are used for Global Navigation Satellite System (GNSS) receivers' phase measurements over approximately subkilometer to kilometer length baselines for the first time. The quantities estimated by these techniques are plasma drift velocity, diffraction anisotropy magnitude and orientation, and characteristic velocity. Uncertainties are quantified by ensemble simulation of noise on the phase signals carried through to the observations of the spaced‐receiver linear system. These covariances are then propagated through to uncertainties on drifts through linearization about the estimated values of the state. Five receivers of SAGA, the Scintillation Auroral Global Positioning System (GPS) Array, provide 100 Hz power and phase data for each channel at L1 frequency. The array is sited in the auroral zone at Poker Flat Research Range, Alaska. A case study of a single scintillating satellite observed by the array is used to demonstrate the spaced‐receiver and uncertainty estimation process. A second case study estimates drifts as measured by multiple scintillating channels. These scintillations are correlated with auroral activity, based on all‐sky camera images. Measurements and uncertainty estimates made over a 30 min period are compared to a collocated incoherent scatter radar and show good agreement in horizontal drift speed and direction during periods of scintillation for which the characteristic velocity is less than the drift velocity.