The Experts below are selected from a list of 18531 Experts worldwide ranked by ideXlab platform

Weiyue Chen - One of the best experts on this subject based on the ideXlab platform.

  • Study on the influence of Rocket booster to Radar Observation
    2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics, 2008
    Co-Authors: Wuxing Jing, Weiyue Chen
    Abstract:

    On the possible influence of rocket 2nd booster or debris (i.e., by-product of the separation) to Radar Observation, the concept of ROIO (Radar overlapped image orbit) is introduced. In this paper, the geometry between the Radar location and the trajectory plane are described, the orbit determination method of ROIO in space is also proposed, the case of two or more Radars is discussed and the influence caused by the earthpsilas rotation is analyzed as well. Simulation results indicate that the influence is neglectable; the original orbitpsilas ROIOs are determined by Radar Observation range and the geometry between the Radarpsilas location and the trajectory plane. Finally, some recommendations are presented on how to avoid ROIOs to affect the determination of the targetpsilas orbit.

  • Study on the Influence ofRocket booster to Radar Observation
    2008
    Co-Authors: Xiwang Xia, Wuxing Jing, Weiyue Chen
    Abstract:

    On the possible influence of Rocket 2nd booster or debris (i.e., by-product of the separation) to Radar Observation, the concept of ROIO (Radar Overlapped Image Orbit) is introduced. In this paper, the geometry between the Radar location and the trajectory plane are described, the orbit determination method of ROIO in space is also proposed, the case of two or more Radars is discussed and the influence caused by the earth's rotation is analyzed as well. Simulation results indicate that the influence is neglectable; the original orbit's ROIOs are determined by Radar Observation range and the geometry between the Radar's location and the trajectory plane. Finally, some recommendations are presented on how to avoid ROIOs to affect the determination of the target's orbit.

Li Chao-yong - One of the best experts on this subject based on the ideXlab platform.

  • Study on the Influence of Rocket Booster on Radar Observation
    Flight Dynamics, 2009
    Co-Authors: Li Chao-yong
    Abstract:

    On the potential influence of Rocket's 2nd booster and debris on Radar Observation,the concept of the Radar Overlapped Image Orbit(ROIO) is introduced.In the case of the Radar in the orbit plane,the preconditions for determination of ROIOs are analyzed.The Radar imaging angle differences of the corresponding locations on the original orbit and its ROIOs are also proposed in this paper.Simulation results indicate that,the Observation region on the target's orbit and the distance from the Radar to the region can be used to determine ROIOs.

  • Influence of rocket booster on Radar Observation in space
    Journal of the Harbin Institute of Technology, 2009
    Co-Authors: Li Chao-yong
    Abstract:

    Aimed at the possible influence of Rocket 2nd booster or debris(i.e.,by-product of the separation) on Radar Observation,the concept of Radar overlapped image orbit(ROIO) is introduced.The geometric relationship between the Radar location and the trajectory plane is described,the orbit determination method of ROIO in space is proposed,and influences of the earth rotation and orbit maneuver on the determination of ROIO are analyzed.Simulation results indicate that ROIOs are determined by the geometric relationship between Radar location and trajectory plane,as well as the Observation region.The earth rotation has little influence on the determination of ROIO.The orbit maneuver of booster will increase the influence of ROIO on Radar Observation.Some recommendations are presented on avoidance of the effect of ROIOs on the determination of the target's orbit.

Wuxing Jing - One of the best experts on this subject based on the ideXlab platform.

  • Study on the influence of Rocket booster to Radar Observation
    2008 2nd International Symposium on Systems and Control in Aerospace and Astronautics, 2008
    Co-Authors: Wuxing Jing, Weiyue Chen
    Abstract:

    On the possible influence of rocket 2nd booster or debris (i.e., by-product of the separation) to Radar Observation, the concept of ROIO (Radar overlapped image orbit) is introduced. In this paper, the geometry between the Radar location and the trajectory plane are described, the orbit determination method of ROIO in space is also proposed, the case of two or more Radars is discussed and the influence caused by the earthpsilas rotation is analyzed as well. Simulation results indicate that the influence is neglectable; the original orbitpsilas ROIOs are determined by Radar Observation range and the geometry between the Radarpsilas location and the trajectory plane. Finally, some recommendations are presented on how to avoid ROIOs to affect the determination of the targetpsilas orbit.

  • Study on the Influence ofRocket booster to Radar Observation
    2008
    Co-Authors: Xiwang Xia, Wuxing Jing, Weiyue Chen
    Abstract:

    On the possible influence of Rocket 2nd booster or debris (i.e., by-product of the separation) to Radar Observation, the concept of ROIO (Radar Overlapped Image Orbit) is introduced. In this paper, the geometry between the Radar location and the trajectory plane are described, the orbit determination method of ROIO in space is also proposed, the case of two or more Radars is discussed and the influence caused by the earth's rotation is analyzed as well. Simulation results indicate that the influence is neglectable; the original orbit's ROIOs are determined by Radar Observation range and the geometry between the Radar's location and the trajectory plane. Finally, some recommendations are presented on how to avoid ROIOs to affect the determination of the target's orbit.

Ji Shunying - One of the best experts on this subject based on the ideXlab platform.

  • Radar digital image technologies for the sea ice field Observation based on an oil/gas platform and the measurement of the sea ice velocity
    Acta Oceanologica Sinica, 2013
    Co-Authors: Ji Shunying
    Abstract:

    Sea ice brings negative influences on offshore structures,nautical transportation and aquaculture in the Liaodong Gulf,where the sea ice condition is most severe in the Bohai Sea.The accurate,successive and long-periodic real time Observation of sea ice parameters is necessary for the investigation of sea ice thermodynamics and dynamics,and also guarantees the safety in an oil/gas exploitation.A sea ice Radar Observation system is set up on the JZ20-2oil/gas platform according to the sea ice characteristics and engineering requirement of the Liaodong Gulf.A digital image processing and analyzing system for sea ice Radar Observation data is developed to extract sea ice concentration,ice velocity and ice floe area.The sea ice conditions in the JZ20-2oil field are monitored and analyzed with this Radar Observation system and digital image processing software during the winter of 2011-2012.Especially,the field distribution of the sea ice velocity and the mean ice velocity in 48hare analyzed.The results provide real time sea ice information for the sea ice management in the oil/gas field,and the investigation of sea ice drifting.Some open problems and improvements for the sea-ice Radar Observation and the digital image processing system are discussed.

Atsushi Kumamoto - One of the best experts on this subject based on the ideXlab platform.

  • Volcanic history in the Smythii basin based on SELENE Radar Observation
    Scientific Reports, 2019
    Co-Authors: Ken Ishiyama, Atsushi Kumamoto
    Abstract:

    Elucidation of the subsurface structure in the Smythii basin on the moon is important for understanding lunar volcanic history. Two lava units (Units 1 and 2) cover this basin. The spatial subsurface structure below Unit 2 is unknown. We used SELENE/Lunar Radar Sounder data to identify four subsurface boundaries at 130, 190, 300, and 420 m depths. The Radar is reflected at the paleo-regolith layer sandwiched among lava flows, which is supported by a simple Radar reflection/transmission model. The spatial distribution of subsurface boundaries demonstrates the deposition of Unit 2 on the subsidence in Unit 1. A simple loading model explained the maximum depth of subsidence (~500 m) and indicated that lithospheric thickness in the Smythii basin was ~24 km at 3.95 Gya. The estimated growth rate of the lithosphere was ~60 km/Ga during 3.95 to 3.07 Gya. After the formation of the Smythii basin at ~4.11 Gya, Unit 1 and Unit 2 deposited with eruption rates of ~8.4 × 10^−4 km^3/yr by 3.95 Gya and ~7.5 × 10^−6 km^3/yr by 3.07 Gya respectively. The timing of decline in volcanic activity in the Smythii basin differs from that for the lunar nearside maria, indicating the diversity of volcanism in various lunar areas.