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Aiming at the problem of difficulty in quickly and accurately estimating the pose of non-cooperative structures of satellites during the operation of space robotic arms, a neural radiation field based method for estimating and tracking the pose of non-cooperative key structures of satellites is proposed. This method first obtains the scene point cloud online through an RGBD camera, segments the point cloud to obtain satellite key structures, and then uses neural radiation fields to automatically establish a three-dimensional model of the key structures. Finally, based on the initial pose generation network and pose evaluation network, accurate pose estimation is obtained. An experimental platform consisting of an RGBD depth camera, a robotic arm, and a satellite model is constructed to conduct pose estimation experiments on key structures of satellites with different poses. The experimental results show that the algorithm proposed can automatically construct a 3D model of non-cooperative targets online without the need for human preparation of target data in advance. At the same time, it can effectively deal with target object occlusion and motion situations, thus achieving true non cooperative target pose estimation and tracking in spatial operations.
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针对空间机械臂操作过程对卫星非合作结构位姿难以快速准确估计的问题,提出一种基于神经辐射场的卫星非合作关键结构位姿估计方法。本方法首先通过RGBD相机在线获取场景点云,并对点云进行识别与分割得到卫星关键结构,然后利用神经辐射场自动建立关键结构三维模型,最后基于位姿生成网络得到准确的位姿估计。搭建由RGBD深度相机、机械臂和卫星模型组成的试验平台,对不同位姿的卫星关键结构进行位姿估计试验。试验结果表明,所提算法可以在线自动构建非合作目标的三维模型,而无须提前人为准备目标数据,从而实现空间操作中真正意义上的非合作目标位姿估计及跟踪。
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陈彦江(1995—),男,工程师,主要研究方向为机器人视觉和智能控制。
王燕波(1978—),男,博士,研究员,主要研究方向为空间机械臂和智能机器人。
梁斌焱(1988—),男,高级工程师,主要研究方向为机器人智能感知。
林俊钦(1988—),男,博士,高级工程师,主要研究方向为多机器人协同、机器人智能感知。
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试验场景掩码示意, figureFileSmall=vErJ+wlWfR32CCk2J9lK8w==, figureFileBig=C7pkTEc+cL3Lnqg+dVJPgg==, tableContent=null), ArticleFig(id=1189585296241980220, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Fig.7, caption=
Satellite key structure model and its discrete point cloud, figureFileSmall=zBlUCKWfgTgNrzKtybWKzQ==, figureFileBig=UIajMDVBsmyErzJD8VsFkA==, tableContent=null), ArticleFig(id=1189585296304894781, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=图7, caption=
卫星关键结构模型及其离散点云, figureFileSmall=zBlUCKWfgTgNrzKtybWKzQ==, figureFileBig=UIajMDVBsmyErzJD8VsFkA==, tableContent=null), ArticleFig(id=1189585296397169470, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Fig.8, caption=
Network training loss value graph, figureFileSmall=W7VSQfyATn8lMHFxCnE82w==, figureFileBig=BQq+euGYiDjdIyN9sIQ8gg==, tableContent=null), ArticleFig(id=1189585296468472639, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=图8, caption=
网络训练损失值, figureFileSmall=W7VSQfyATn8lMHFxCnE82w==, figureFileBig=BQq+euGYiDjdIyN9sIQ8gg==, tableContent=null), ArticleFig(id=1189585296539775808, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Fig.9, caption=
Experimental platform, figureFileSmall=YUqSvXyXuztbcIOEr1/LkA==, figureFileBig=DOIS9v0V2ZS9ZFqlHcTIVg==, tableContent=null), ArticleFig(id=1189585296602690369, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=图9, caption=
试验平台, figureFileSmall=YUqSvXyXuztbcIOEr1/LkA==, figureFileBig=DOIS9v0V2ZS9ZFqlHcTIVg==, tableContent=null), ArticleFig(id=1189585296661410626, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Fig.10, caption=
The result of satellite key structure point cloud segmentation, figureFileSmall=u/ZNS3A6OaLT6oszFnw3wg==, figureFileBig=ThuuwwCL+Wjz6H/ivDbCjg==, tableContent=null), ArticleFig(id=1189585296732713795, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=图10, caption=
卫星关键结构点云分割结果, figureFileSmall=u/ZNS3A6OaLT6oszFnw3wg==, figureFileBig=ThuuwwCL+Wjz6H/ivDbCjg==, tableContent=null), ArticleFig(id=1189585296854348612, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Fig.11, caption=
Pose estimation results, figureFileSmall=YcGc6UjU0Rb7NzTiPPX15g==, figureFileBig=EI5tEn1p8oaJdzB9bCNLvw==, tableContent=null), ArticleFig(id=1189585296925651781, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=图11, caption=
位姿估计结果, figureFileSmall=YcGc6UjU0Rb7NzTiPPX15g==, figureFileBig=EI5tEn1p8oaJdzB9bCNLvw==, tableContent=null), ArticleFig(id=1189585296996954950, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Tab.1, caption=
Experimental results of satellite key structure point cloud segmentation
, figureFileSmall=null, figureFileBig=null, tableContent=
| 卫星本体 | 尾喷管 | 侧翼喷管 | 太阳能帆板 | 安装螺母 |
| 2.1 m | 0.712 | 0.721 | 0.0 | 0.741 | 0.0 |
| 1.6 m | 0.734 | 0.727 | 0.152 | 0.762 | 0.216 |
| 1.1 m | 0.801 | 0.754 | 0.584 | 0.811 | 0.617 |
| 0.6 m | 0.766 | 0.738 | 0.613 | 0.834 | 0.714 |
| 平均值 | 0.753 | 0.735 | 0.337 | 0.787 | 0.387 |
), ArticleFig(id=1189585297064063815, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=表1, caption=
卫星关键结构点云分割试验结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 卫星本体 | 尾喷管 | 侧翼喷管 | 太阳能帆板 | 安装螺母 |
| 2.1 m | 0.712 | 0.721 | 0.0 | 0.741 | 0.0 |
| 1.6 m | 0.734 | 0.727 | 0.152 | 0.762 | 0.216 |
| 1.1 m | 0.801 | 0.754 | 0.584 | 0.811 | 0.617 |
| 0.6 m | 0.766 | 0.738 | 0.613 | 0.834 | 0.714 |
| 平均值 | 0.753 | 0.735 | 0.337 | 0.787 | 0.387 |
), ArticleFig(id=1189585297139561288, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=EN, label=Tab.2, caption=
Pose estimation error results
, figureFileSmall=null, figureFileBig=null, tableContent=
| 太阳能帆板 | 尾喷管 | 安装 螺母 | 侧翼 喷管 | 平均值 |
| 平均距离误差 | 4.6 | 8.8 | 8.3 | 9.5 | 7.55 |
), ArticleFig(id=1189585297210864457, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1189585010513408317, language=CN, label=表2, caption=
位姿估计误差结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 太阳能帆板 | 尾喷管 | 安装 螺母 | 侧翼 喷管 | 平均值 |
| 平均距离误差 | 4.6 | 8.8 | 8.3 | 9.5 | 7.55 |
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