The Feasibility of Ocean Surface Current Measurement Using Pencil-Beam Rotating Scatterometer

Bao, Qing; Dong, Xiaolong; Zhu, Daoben; Lang, Shuyan; Xu, Xingou

doi:10.1109/jstars.2015.2414451

Cited by 32 publications

(23 citation statements)

References 14 publications

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“…So, we can measure the target velocity vector by the interference phases of the two successive echoes observed at two different azimuths. Then, by solving Equations (15) and 16, we can obtain: Here, k is the wavenumber of the electromagnetic wave. The radial velocity component can be written as:…”

Section: Measurement Principle Of Dopscat Based On the Pencil-beam Symentioning

confidence: 99%

“…To achieve a high PRF, a modified pulse sequence is required, as shown in Figure 12. The modified pulse sequence [15] is applied in the following system simulation. Figure 12 shows the modified pulse sequence.…”

Section: Pulse Sequencementioning

confidence: 99%

“…The outputs are current velocity accuracies in the along-track and cross-track directions. For the correlation model, the complex correlation coefficient can be written as the products of four decorrelation terms [15]:…”

Section: System Simulationmentioning

confidence: 99%

“…Based on the radar equation, a smaller pulse length produces a lower SNR, and gives rise to a smaller thermal noise decorrelation. However, a lower PRF means a longer interference time interval (as τ = 1/PRF, where τ is the interference time interval) and would give rise to a smaller spatial decorrelation [15,23]. Therefore, the choice of the PRF must be optimized.…”

Section: System Simulationmentioning

confidence: 99%

“…Fois et al [13,14] showed that the Doppler shift could be estimated from a combination of two linear frequency modulated pulses: one with increasing frequency in time, i.e., up-chirp, and the other with decreasing frequency, i.e., down-chirp. Bao et al [15] analyzed the feasibility of current measurement using a pencil-beam scatterometer.…”

Section: Introductionmentioning

confidence: 99%

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Perspective of a Ku-Ka Dual-Frequency Scatterometer for Simultaneous Wide-Swath Ocean Surface Wind and Current Measurement

Miao

Dong

Bao³

et al. 2018

Remote Sensing

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Ocean surface wind and current are essential ocean dynamic environment and climate variables, and simultaneous observations at high resolution have attracted considerable interest. The study on surface wind and current will improve our knowledge of energy transfer between the atmosphere and the ocean, as well as the advection of heat, nutrients, and pollutants in the ocean. Since ocean surface wind and current are tightly coupled, we discuss the wind speed and direction errors effects on current, and find that current velocity is sensitive to wind speed and direction errors. Thus, it is necessary to obtain simultaneous wind field information to mitigate the effects of the wind on current retrieval. In this study, we present a Ka-Ku dual-frequency pencil-beam Doppler Scatterometer (DopScat), keeping the Ku-band for wind measurement and the Ka-band for current measurement. We establish an end-to-end simulation model to analyze the performance of the dual-frequency DopScat, and discuss the effects of satellite attitude and velocity determinations on current retrieval. The system parameters were optimized based on the simulation model. The simulation results show that the K pc of the Ku-band DopScat is better than that of the traditional fan-beam and pencil-beam scatterometer, which is beneficial to improve wind measurement accuracy. In the Ka-band DopScat, the standard deviations (Stds) of current velocity in both along-track and cross-track directions could be smaller than 0.05 m/s, when the wind speed is larger than 5 m/s. When the wind speed is 7 m/s, the current field effective swath is 660 km, accounting for 63% of the DopScat swath, with an accuracy of 0.05 m/s. Our results indicate that the use of a Ku-Ka dual-frequency DopScat could be a feasible method for wide-swath and high-accuracy simultaneous measurements of ocean surface wind and current.

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Section: Measurement Principle Of Dopscat Based On the Pencil-beam Symentioning

confidence: 99%

Section: Pulse Sequencementioning

confidence: 99%

Section: System Simulationmentioning

confidence: 99%

Section: System Simulationmentioning

confidence: 99%