Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： High-resolution reconstruction techniques are investigated for Hai Yang-2Scatterometer(HY2-SCAT)backscatter measurements for a variety of application purposes including land and polar ice detection and the studies of cryophere and biosphere.Three resolution enhancement algorithms,including Additive Algebraic Reconstruction Technique (AART),Multiplicative Algebraic Reconstruction Technique(MART)and Scatterometer Image Reconstruction(SIR),are compared by simulation approach.The results that SIR has the best performance in noise suppression and resolution enhancement of the backscatter measurements than AART and MART algorithms.This study is verified using HY2-SCAT Level-1B(L1B)backscatter measurements.The sigma~0 measurements over some sites with particular backscattering characteristics(e.g.islands)are reconstructed.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： In absolute altimeter calibration campaigns,the Sea Surface Height(SSH)series derived from the in-situ Differential GPS(DGPS)buoys always include high frequency errors such as wind waves and instrumental noises. The former can be removed by low pass filters,while the latter can not,because the noises are white and can spread in the whole frequency band of interest.In this paper,the Singular Spectrum Analysis(SSA)method was applied to solve the problem,and select criteria of the embedding dimension and intercepting length.Simulations based on this innovative method were executed,the effectiveness in removing the instrumental noise and the selction criteria was validated.Finally,SSH series derived from an in-situ DGPS buoy experiment were processed by this method,and the study suggested that the processed series were smoother compared to the original series,and had some improvements in accuracy.Therefore,the validity of the SSA method was demonstrated.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： A flight experiment is an important experimental step that needs to be conducted in the prelaunch for Chinese-French Oceanic SATellite(CFOSAT).Functionally,performance and data validation of spaceborne scatterometer should be verified to ensure in-orbit work status.In this flight experiment,return signal simulator is used to conduct ground-based system testing and calibration for CFOSAT,which proposes a method to use return signal simulator for spaceborne scatterometer system calibration.This method is helpful to ground-based calibration experiments for CFOSAT.Return signal simulator could provide a known echo signal.The results in flight experiments verify the feasibility and accuracy by return signal simulator to conduct the ground-based calibration for spaceborne scatterometer.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： A method using Simulink to build the simulation model of the microwave interferometric radiometer(MIR)system is introduced in this paper.Two-element interferometer is the basic unit of the MIR system. By the Simulink platform,a simulation model of the two-element interferometer was built and the measurement process of the random noise was simulated.Through the simulation of the full power measurement achieved interference measurement of single channel and two channels.Quantitative analysis of the radiometric accuracy and radiometric sensitivity were achieved in the time domain.
Peer Review Status:Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： Temperature control is a simple and effective way to improve the system stability of the totalpower-type microwave radiometer,the full-polarimetric microwave radiometer can achieve high precision measurement for retrieving the sea surface wind vector by the method.Using a 23.8GHz digital-correlation full-polarimetric microwave radiometer,considering the effects of temperature on calibration of the polarimeter and adopting a special temperature control scheme,a constant temperature control system was designed to make the radiometer work stably.The experimental results show that the constant temperature control scheme can make the radiometer work in a stable state which can simplify the calibration process, make the calibration cycle longer and ensure the accuracy requirement of the calibration.
Peer Review Status:Awaiting Review
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