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1. chinaXiv:201703.00294 [pdf]

Adaptive regularization method for forward looking Azimuth super-resolution of a Dual-Frequency Polarized Scatterometer

Liu, Liling; Dong, Xiaolong; Zhu, Jintai; Zhu, Di
Subjects: Geosciences >> Space Physics

Dual-Frequency Polarized Scatterometer (DFPSCAT) is a pencil-beam rotating scatterometer which is used to measure snow water equivalence (SWE). Respecting the low azimuth resolution of its forward-looking region, an adaptive regularization deconvolution super-resolution method, based on the scatterometer echo signal model, is proposed. Compared with the classical SIR and MAP algorithms, the proposed method can better reconstruct the original signal, and has less noise amplification. The algorithm processing accuracy with different Kpcis also studied, and the results show that when the value of Kpcis less than 0.1, nearly the entire restored data can satisfy the requirement of 0.5dB accuracy.

submitted time 2017-03-10 Hits498Downloads284 Comment 0

2. chinaXiv:201608.00209 [pdf]

PMT overshoot study for JUNO prototype detector

Feng-Jiao Luo; Yue-Kun Heng; Zhi-Min Wang; Pei-Liang Wang; Zhong-Hua Qin; 2 Mei-Hang Xu; Dong-Hao Liao; Hai-Qiong Zhang; Yong-Bo Huang; Xiang-Cui Lei; Sen Qian; Shu-Lin Liu; Yuan-Bo Chen; Yi-Fang Wang
Subjects: Physics >> Nuclear Physics

The quality of PMT signal is one of the key items for a large and high precision neutrino experiment, like Daya Bay, JUNO, while most of the experiments are affected by the PMT signal overshoot from its positive HV-single cable scheme. For JUNO prototype detector, we have a detailed study on the PMT overshoot and successfully reduced the ratio of overshoot amplitude to signal to ~1% from previous typical ~10%, with no affection to PMT other parameters. Furthermore, we calculated that the overshoot is a result of discharging of capacitors in the HV-signal splitter and the PMT voltage divider. The study result is extremely important for JUNO and other similar experiments.

submitted time 2016-08-31 Hits438Downloads187 Comment 0

3. chinaXiv:201605.00288 [pdf]

THEORETICAL AND EXPERIMENTAL ANALYSIS OF SPATIAL DECORRELATION OF DOPPLER SCATTEROMETER

Bao, Qingliu; Dong, Xiaolong; Zhu, Di; Xu, Xingou
Subjects: Geosciences >> Space Physics

Ocean surface current is a very important parameter of ocean dynamic environment, which has been connected to global climate change, marine environment forecasting, marine navigation, engineering security and so on. Doppler scatterometer is a new type of scatterometer that can be used to measure ocean surface current as well as the ocean wind vector in space. The Doppler Scatterometer is based on a real aperture radar, which can achieve a very wide swath. It can provide the ocean surface current and wind vector information in a certain resolution and achieve global coverage quickly, which is very important for the marine environment forecasting and climate changes research.

submitted time 2016-05-03 Hits460Downloads282 Comment 0

4. chinaXiv:201605.00281 [pdf]

ADAPTIVE REGULARIZATION METHOD FOR FORWARD LOOKING AZIMUTH SUPER-RESOLUTION OF A DUAL-FREQUENCY POLARIZED SCATTEROMETER

Liu, Liling; Dong, Xiaolong; Zhu, Jintai; Zhu, Di
Subjects: Geosciences >> Space Physics

Dual-Frequency Polarized Scatterometer (DFPSCAT) is a pencil-beam rotating scatterometer which is used to measure snow water equivalence (SWE). Respecting the low azimuth resolution of its forward-looking region, an adaptive regularization deconvolution super-resolution method, based on the scatterometer echo signal model, is proposed. Compared with the classical SIR and MAP algorithms, the proposed method can better reconstruct the original signal, and has less noise amplification. The algorithm processing accuracy with different K-pc is also studied, and the results show that when the value of K-pc is less than 0.1, nearly the entire restored data can satisfy the requirement of 0.5dB accuracy.

submitted time 2016-05-03 Hits611Downloads355 Comment 0

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