With regard to the inferior techniques and low accuracy of phase center calibration of an antenna array, this paper proposes a new calibration method considering the actual antenna pointing by introducing a precise en...With regard to the inferior techniques and low accuracy of phase center calibration of an antenna array, this paper proposes a new calibration method considering the actual antenna pointing by introducing a precise engineering surveying technique to measure the real state of antennas. First, an industrial photogrammetric system is utilized to obtain the coordinates of points on antenna panels in different postures, and the actual pointing of the mechanical axis is obtained via least-squares fitting. Then, based on this, the coordinates of antenna rotation center are obtained by seeking the intersection of mechanical axes via using the matrix method. Finally, the mechanical axis in arbitrary postures is estimated based on the inverse-angle weighting interpolation method, and the reliable phase center is obtained by moving a fixed length from the projective center along the mechanical axis. An uplink antenna array including three ? 3 m antennas is taken as experimental object, and all photogrammetric coordinate systems are unified by the engineering control network, with each antenna phase center precisely calibrated via the proposed method. The results of electrical signal synthesis indicate that this method can effectively overcome the influence of gravity deformation and mechanical installation error, and enhance the synthetic signal magnitude of the uplink antenna array.展开更多
大型带状工程高精度施工控制网,对于工程的实施起着至关重要的作用。论文介绍了大中城市中心城区带状工程GPS施工控制网的建立方法及数据处理过程,采用Trimble Business Center软件对GPS静态观测数据进行了数据处理,并对控制网的精度进...大型带状工程高精度施工控制网,对于工程的实施起着至关重要的作用。论文介绍了大中城市中心城区带状工程GPS施工控制网的建立方法及数据处理过程,采用Trimble Business Center软件对GPS静态观测数据进行了数据处理,并对控制网的精度进行了分析。结果显示:本工程施工控制网布网方案合理,精度较高。最后,论文为类似工程的实施总结了几点经验。展开更多
文摘With regard to the inferior techniques and low accuracy of phase center calibration of an antenna array, this paper proposes a new calibration method considering the actual antenna pointing by introducing a precise engineering surveying technique to measure the real state of antennas. First, an industrial photogrammetric system is utilized to obtain the coordinates of points on antenna panels in different postures, and the actual pointing of the mechanical axis is obtained via least-squares fitting. Then, based on this, the coordinates of antenna rotation center are obtained by seeking the intersection of mechanical axes via using the matrix method. Finally, the mechanical axis in arbitrary postures is estimated based on the inverse-angle weighting interpolation method, and the reliable phase center is obtained by moving a fixed length from the projective center along the mechanical axis. An uplink antenna array including three ? 3 m antennas is taken as experimental object, and all photogrammetric coordinate systems are unified by the engineering control network, with each antenna phase center precisely calibrated via the proposed method. The results of electrical signal synthesis indicate that this method can effectively overcome the influence of gravity deformation and mechanical installation error, and enhance the synthetic signal magnitude of the uplink antenna array.
文摘大型带状工程高精度施工控制网,对于工程的实施起着至关重要的作用。论文介绍了大中城市中心城区带状工程GPS施工控制网的建立方法及数据处理过程,采用Trimble Business Center软件对GPS静态观测数据进行了数据处理,并对控制网的精度进行了分析。结果显示:本工程施工控制网布网方案合理,精度较高。最后,论文为类似工程的实施总结了几点经验。
