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| 1 | Progresses and Prospects of Marine Geodetic Datum and Marine Navigation in China显示文摘Territorial water is a significant part of national sovereignty of China,thus the infrastructures of national space datum and location services should cover the sea areas except for the land areas.China has established relatively complete geodetic coordinate frame in land areas over the past decades,including the lastest developed China Geodetic Coordinate System 2000(CGCS 2000)with its reference frame and the national gravity datum 2000.However,the currently used geodetic infrastructures have not well covered the sea areas of China.The marine geodetic datum and marine navigation technologies need to be further developed and extended to satisfy the national demands of marine environment and resources detection,scientific investigation as well as marine economy development in new era of China.This paper mainly reviews the development and the progress of Chinese marine geodetic datum and marine navigation,analyses related key technologies in establishing our national marine geodetic datum.Some current trends and future directions for independently developing our national marine geodetic datum and marine navigation technologies are discussed. | Yuanxi YANG Tianhe XU Shuqiang XUE | 2018 | Journal of Geodesy and Geoinformation Science2018，1，1： | 16 |
| 2 | Seafloor geodetic network establishment and key technologies显示文摘Seafloor geodetic network construction involves the development of geodetic station shelter, network configuration design, location selection and layout, surveying strategy, observation model establishment and optimization, data processing strategy and so on. This paper tries to present main technological problems involved in the seafloor geodetic network construction, and seek the technically feasible solutions. Basic conceptions of developing seafloor geodetic station shelters for shallow sea and deep-sea are described respectively. The overall criteria of seafloor geodetic network construction for submarine navigation and those of network design for crustal motion monitoring are both proposed. In order to enhance application performances of the seafloor geodetic network, the seafloor network configuration should prefer a symmetrical network structure. The sea surface tracking line measurements for determining the seafloor geodetic station position should also adopt an approximately symmetrical configuration, and we recommend circle tracking line observations combined with cross-shaped line(or double cross-shape line) observations for the seafloor positioning mode. As to the offset correction between the Global Navigation Satellite System antenna phase center and the acoustic transducer, it is recommended to combine the calibration through external measurements and model parameter estimation. Besides, it is suggested to correct the sound speed error with a combination of observation value correction and parameterized model correction, and to mainly use the model correction to reduce the influence of acoustic ray error on the seafloor positioning. Following the proposed basic designs, experiments are performed in shallow sea area and deep-sea area respectively. Based on the developed seafloor geodetic shelter and sufficient verification in the shallow sea experiment, a long-term seafloor geodetic station in the deep-sea area of 3000 m depth was established for the first time, and the preliminary positioning result shows that the internal precision of this station is better than 5 cm. | Yuanxi YANG Yanxiong LIU Dajun SUN Tianhe XU Shuqiang XUE Yunfeng HAN Anmin ZENG | 2020 | Science China Earth Sciences2020，63，8： | 11 |
| 3 | Centimeter‑level‑precision seafloor geodetic positioning model with self‑structured empirical sound speed profile显示文摘In-field Sound Speed Profile(SSP)measurement is still indispensable for achieving centimeter-level-precision Global Navigation Satellite System(GNSS)-Acoustic(GNSS-A)positioning in current state of the art.However,in-field SSP measurement on the one hand causes a huge cost and on the other hand prevents GNSS-A from global seafloor geodesy especially for real-time applications.We propose an Empirical Sound Speed Profile(ESSP)model with three unknown temperature parameters jointly estimated with the seafloor geodetic station coordinates,which is called the 1st-level optimization.Furthermore,regarding the sound speed variations of ESSP we propose a so-called 2nd-level optimization to achieve the centimeter-level-precision positioning for monitoring the seafloor tectonic movement.Long-term seafloor geodetic data analysis shows that,the proposed two-level optimization approach can achieve almost the same positioning result with that based on the in-field SSP.The influence of substituting the in-field SSP with ESSP on the horizontal coordinates is less than 3 mm,while that on the vertical coordinate is only 2–3 cm in the standard deviation sense. | Shuqiang Xue Baojin Li Zhen Xiao Yue Sun Jingsen Li | 2023 | Satellite Navigation2023，4，3： | 3 |
| 4 | Adjustment Model and Colored Noise Compensation of Continuous Observation System显示文摘The affection caused by the colored noises should be taken into account to the adjustment model.As useful signals,these colored noises should be accurately identified and extracted by Fourier analysis.A continuous adjustment model is introduced with respect to the colored noises,and then it can be generalized from the finite space to the infinite space so called as Hilbert space.This extension is to provide a new technique to perform the continuous observational system design,Fourier analysis as well as the parameter estimation.It shows that the Gramer’s determinant provides maximization criteria in the system optimization design as well as a rule in diagnosing the adjustment model.Related with the definition of the integral,the least squares solution of the continuous adjustment model becomes the limit of the traditional least squares solution in finite space.Moreover,the influence caused by the colored noises is systematic,but it can be eliminated or compensated by optimally designing the observational system. | Shuqiang XUE Yuanxi YANG | 2018 | Journal of Geodesy and Geoinformation Science2018，1，1： | 2 |
| 5 | Analytical optimization on GNSS buoy array for underwater positioning显示文摘Global navigation satellite system(GNSS)/acoustic positioning precision is determined by the positioning geometry and the ranging precision;thus optimizing GNSS buoys array is meaningful to improve the positioning accuracy and reliability.An analytical method is proposed for optimizing the GNSS buoys array with regard to the cutoff angle constraints for underwater acoustic observations.For the practical limitation of coplanarity of GNSS buoys and the cutoff angle,an algorithm is proposed to analytically minimize the position dilution of precision(PDOP).The proposed method is validated to give complete solutions of PDOP minimization with five GNSS buoys.At last,in order to search a best configuration among the PDOP solution set,we propose a search algorithm to get the solution with the smallest geometric dilution of precision(GDOP).It indicates that within a given region,the GDOP minimization at the center of a region is equivalent to the PDOP mean minimization over the region.The relation between the positioning accuracy and the positioning geometry with five known points is illustrated in an experiment performed in South China Sea. | Ke Qi Guoqing Qu Shuqiang Xue Tianhe Xu Xiaoqing Su Yixu Liu Jun Wan | 2019 | Acta Oceanologica Sinica2019，38，7： | 2 |
| 6 | Effects of Plant Spacing,Row Spacing and Seedling Number Allocation on the Growth Dynamics of Different Populations of Two Types of Rice Varieties显示文摘[Objectives]This study was conducted to construct high-yielding,high-quality,and high-light-efficiency population structures of different types of rice varieties.[Methods]The effects of plant spacing,row spacing and seedling number allocation on stems and tillers,leaf area and dynamic traits of high-yielding rice populations(more than 9750 kg/hm^(2))and low-yielding populations(less than 9750 kg/hm^(2))were studied by two kinds of representative rice varieties with different tiller ability and panicle sizes in cold regions.[Results]Decreasing the plant and row spacing and increasing the number of planted seedlings per hole advanced the heading date and made the number of stems and tillers in the population increase.The impact on the super rice variety with fewer tillers and heavier panicles was greater than that of conventional variety with more tillers and lighter panicles.The stems and tillers of the high-yielding high-quality populations grew steadily in the early stage of development,until an appropriate number of panicles was reached at the critical leaf age for productive tillers(June 25),and the peak seedlings should appear in the jointing stage(July 9)with a small number(that value of Longjing 21,the super rice variety with fewer tillers and heavier panicles,was about 1.2 times the expected panicle number,and that of the conventional variety with more tillers and lighter panicles,Kongyu 131,was about 1.1 times the expected panicle number).The populations gradually declined since then,until reaching an appropriate number of panicles at the heading stage.The high-yielding high-quality populations had a higher leaf area index at the heading stage.The value of Longjing 21,the super rice variety with fewer tiller and heavier panicles,reached about 6.0,and that of Kongyu 131,the conventional variety with more tillers and lighter panicles,reached about 4.5.The values decreased thereafter.At the maturation stage,the leaf area index of Longjing 21 remained above 2.5,and that of Kongyu 131 remained above 2.0.[Conclusions]This study has an important guiding role and significance for their high-yielding and high-quality supporting cultivation in cold regions. | Jingfang XUE Guangshan ZHAO Shuqiang CHEN Xiaodong DU Limin YANG Haixin ZHAO Yongsheng CAI Tong ZHOU Linan WANG Mingxu ZHOU | 2021 | Agricultural Biotechnology2021，10，2： | 1 |
| 7 | Positioning Configurations with the Lowest GDOP and Their Classification显示文摘 | Xue Shuqiang Yang Yuanxi | 2015 | Journal of Geodesy2015，89，1： | 1 |
| 8 | Dynamic Positioning Configuration and Its First-order Optimization显示文摘 | Xue Shuqiang Yang Yuanxi Dang Yamin | 2014 | Journal of Geodesy2014，88，2： | 1 |
| 9 | A closed-form of Newton method for solving over-determined pseudo-distance equations显示文摘 | Shuqiang Xue Yuanxi Yang Yamin Dang | 2014 | Journal of Geodesy2014，，5： | 1 |
| 10 | Dynamic positioning configuration and its first-order optimization显示文摘 | Shuqiang Xue Yuanxi Yang Yamin Dang Wu Chen | 2014 | Journal of Geodesy2014，，2： | 1 |
| 11 | Experimental Study on Water Saving of Large-scale Mechanized Paddy Field Production Process in Heilongjiang Province显示文摘In order to clarify the water-saving technologies and standards in large-scale mechanized production of paddy fields, the water-saving effects and cost-benefit situations of paddy field steeping, seedling transplanting and different land preparation methods were studied. The results showed that the suitable water layer height for the closing period of mechanized operation was 10 cm, which could save water, facilitate weed control, and lead to better effect and the highest yield. The treatment with a water layer height of 1 cm(Huadashui) for the seedling planting operation achieved better quality of seedling transplanting, lower vacancy rate and higher yield and was water-saving. From the perspective of saving water and taking into account the cost of land preparation, the method of steeping and beating the field was better than the method of plowing in autumn and rotary tillage and harrowing in spring, but it was very prone to lodging. From the perspective of high yield creation, the method of plowing in autumn and rotary tillage and harrowing in spring was significantly better than the method of steeping and beating the field. In order to reduce the cost of land preparation, it is recommended to change the way of plowing in autumn and rotary tillage and hallowing in spring to plowing in autumn and rotary tillage in spring or plowing and hallowing in spring to reduce the cost of one time of rotary tillage, and to simultaneously realize deeper plough layer, which is conducive to preventing lodging and obtaining high yield. | Jingfang XUE Shuqiang CHEN Yongsheng CAI Xiaodong DU Limin YANG Haixin ZHAO Tong ZHOU Mingxu ZHOU Linan WANG | 2021 | Agricultural Biotechnology2021，10，1： | 0 |
| 12 | A Measuring,Reporting and Verifying System for REDD+ Activities in China显示文摘Challenges and focus that Measureable, Reportable and Verifiable of REDD+ activities will face are analyzed base on provisions relate to MRV for REDD+ in UNFCCC.It will face the challenges of lake of messages in estimating biomass carbon storage and reference level,certification standards, the national methodology of REDD+ activities,and financial support if measurable,reportable and verifiable REDD+ activities are developed in China. Based on the results of the analysis,the different types for REDD+ activities that adapt to Chinese situation are put forward,and it was designed that the framework on Measuring,Reporting and Verifying System for REDD+ activities in China including general indicator such as objectives, implementation,contribution to sustainable development and poverty eradication,environment effectiveness,sustainability and cost-effectiveness. | Xue Ming Wu Shuhong Cheng Shuqiang | 2012 | Chinese Forestry Science and Technology2012，11，3： | 0 |
| 13 | Comparisons of Protein Composition of Grains at Different Positions in Panicles between Erect and Curved Panicle Type Japonica Rice显示文摘Under field conditions,three erect panicle type japonica rice cultivars and three curved panicle type japonica rice cultivars were applied as experimental materials to investigate the differences of protein composition of grains at different positions in panicles between two different panicle types of japonica rice. According to the results,the panicle type of japonica rice had no direct correlation with albumin content,globulin content,prolamin content and glutelin content in rice,variations of protein composition of grains at different positions in panicles. There were certain correlations between soluble protein contents at different grain positions in the same panicle and the flowering order of glumous flowers in the panicle. Albumin content,prolamin content and glutelin content in grains on secondary rachis branches of two panicle types( erect and curved) of japonica rice cultivars were higher than that on primary rachis branches,while globulin content exhibited an opposite trend. Globulin content,prolamin content and glutelin content in grains at different positions demonstrated a descending order of bottom > middle >top,while albumin content exhibited an opposite trend. The interactions between primary and secondary rachis branches and among top,middle and bottom rachis branches significantly affected soluble protein contents. | Shuqiang CHEN Jingfang XUE Xiaodong DU Limin YANG Haixin ZHAO Tong ZHOU Lili SHAN Cui WANG Min LI Guojun PAN | 2015 | Agricultural Biotechnology2015，4，6： | 0 |
| 14 | Recent Advances in Marine Geodesy of China显示文摘The ocean accounts for approximately 71%of the total area of the Earth.Whether it is studying the shape of the Earth itself through geodesy or the future development of earth system science,strengthening the construction of ocean geodesy disciplines and innovating ocean geodetic observation technologies have evident theoretical and practical significance.In recent years,the discipline of ocean geodesy in China has been continuously developing and growing,and notable breakthroughs have been made in ocean satellite geodesy and seafloor geodetic observation technology.Research on ocean geodetic observation models and algorithms has also made great progress. | Shuqiang XUE Tianhe XU Yanxiong LIU Anmin ZENG Baogui KE Shuang ZHAO | 2023 | Journal of Geodesy and Geoinformation Science2023，6，3： | 0 |
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