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Simulation of Multi-satellite GNSS reflected signals and Design of Simulator

Journal of Geodesy and Geoinformation Science 2021年第2期4卷 36-46页

作者： Bowen LI Dongkai YANG Bo ZHANG School of Electronics and Information EngineeringBeihang UniversityBeijing 100191China

Using GNSS-R technology for remote sensing of surface parameters has become a new trend in the field of remote sensing.With the rapid development of GNSS-R technology,GNSS-R simulation has become one of the new hot spots.Now the researches of the GNSS-R simulation are all the simulations that consider a single star or a single frequency point,and in actual applications,the signal captured by the receiver is often the reflected signals of multiple stars.In view of this situation,from the perspective of multi-satellite simulation,this paper gives the model of GNSS-R multi-satellite ocean simulation on the basis of analyzing the remote sensing principle,reflection signal model and simulation principle of GNSS-R technology.Based on the GNSS-R multi-satellite ocean simulation model and the fast parallel computing capability of GPU,the GNSS-R multi-satellite ocean simulator was designed.Finally,the direct and reflected signals generated by the GNSS-R multi-satellite simulator were tested and verified.The results show that the positioning result of the direct signal meets the positioning accuracy requirements;The delay-related power results obtained from the simulated two-satellite reflected signals processing are in good agreement with the theoretical model,and the correlation coefficients are all above 0.99;The generated signals are used for GNSS-R height measurement technology,the height measurement error is about 1.4~1.8 m,which is in line with the accuracy of the C/A code ranging receiver;And the parallel operation of the GPU for multi-satellite simulation calculation is 800—900 times higher than the traditional CPU calculation.It proves that the proposed model and the designed simulator are feasible and accurate.

关键词： GNSS reflected signals multi-satellite simulation simulator design

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Sea Wind Speed Estimation from Power Waveforms of GNSS-R Delay signals of Beidou MEO Satellite

Sea Wind Speed Estimation from Power Waveforms of GNSS-R Del...

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第37届中国控制会议

作者： Mohammad Shohidul Islam Dongkai Yang Sultana Easmin Siddika Rodolfo D.Moreno Santillan S M Injamamul Haque Masum School of Electronic and Information Engineering Beihang University School of Economics and Management Beihang University International School Beihang University

This paper focuses the characteristics of power waveforms according to different wind speed of sea surface and then sea wind speed is estimated from the amplitude of power waveforms. The power waveforms are generated from the delay signals of Beidou MEO satellite. The remote sensing of GNSS concept is utilized to get information from sea surface. Because, this technique has been already proved as an effective tool to retrieve significant information from earth’s surface since last twenty years. Still now, it has been utilizing as an advance technique for sea state monitoring, i.e. sea wind speed ＆ direction, sea wave height, sea roughness measurement and so on. It is mainly generated the waveforms of Beidou MEO satellite for direct and reflected signals. It is obtained that the amplitude ＆ shape of these power waveforms are varying according to wind speed. It is indicated that there is a sharp relationship between the amplitude of the waveforms and sea wind speeds. Two models are used to generate the waveforms from reflected signals. The wave spectrum model is used to find sea surface slopes i.e. up ＆ cross variance and these up ＆ cross variance is used as input on Z-V scattering model to generate power waveforms. The real wind speed of the experiment site of GNSS-R data collection for same time domain is also collected. The linear regression method is used to established a relationship between wind speeds and amplitudes of the waveforms. This relation is used to measure the sea wind speed. It is found that estimated wind speeds are matched closely with real wind speed and model waveforms performs good results with real data waveforms.

关键词： Power waveforms reflected signals scattering model wave spectrum model wind speed

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Modeling and simulation of GNSS-R signals with ocean currents

Modeling and simulation of GNSS-R signals with ocean current...

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第十一届中国卫星导航年会

作者： Bowen Li Baoguo Yu Lei Yang Dongkai Yang Hua Han School of Electronics and Information Engineering Beihang University State Key Laboratory of Satellite Navigation System and Equipment Technology The 54th Research Institute of China Electronics Technology Group Corporation College of Information Science and Engineering Shandong Agricultural University

In recent years, with the development of Global Navigation Satellite System(GNSS), GNSS reflectometry(GNSS-R) has become a new method in the field of remote sensing. And the simulation of the GNSS-R r

关键词： GNSS reflected signals ocean currents modeling simulation

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