跨海大桥下GNSS信号盲区换能器瞬时高程基准精密确定方法研究

发布时间：2018-06-10 17:45

本文选题：跨海大桥 + 船载组合模式　；参考：《东华理工大学》2017年硕士论文

【摘要】：我国跨海大桥数量日益增多,跨海大桥桥墩及桥区周围海床冲淤变形是影响桥体安全的重要因素。但在监测过程中,由于受桥体遮挡,船载GNSS接收机信号在桥区导航精度差或无法导航;同时跨海大桥多处于海峡或海湾潮汐变化复杂区域,且桥体跨度较长,测船附近实时高分辨率精确潮位获取较为困难。以上两个原因,导致多波束声波发射瞬间高程基准精度较差。为解决上述问题,本文基于双船模式船载组合系统确定GNSS信号盲区换能器瞬时高程基准,开展如下研究内容:1)阐释基于双船模式(1号主测量,2号GNSS潮位确定)的组成和工作原理,详细说明该组合系统的特点。基于2号船GNSS潮位数据确定,提供1号主测量船瞬时潮位,解决了现有在GNSS信号盲区无法取得精确潮位问题。2)详细阐明多传感器系统时间同步的重要性。采用UTC时间作为基准,基于多源信号垂直特征匹配将GNSS与姿态传感器时间统一;基于样条插值函数将GNSS和姿态数据时间匹配;基于内插外推法将压力传感器吃水数据和GNSS时间匹配,有效解决了多传感器时间不同步问题,提高了双船模式测量精度。3)仔细分析空间数据处理对GNSS信号盲区换能器瞬时高程精度的影响。针对各数据处理环节:开展GNSS高程信号质量控制研究;基于船载压力传感器吃水改正研究;基于船载姿态传感器姿态改正研究;基于快速傅里叶变换潮位确定研究。在上述空间数据研究基础上,获得跨海大桥下GNSS信号盲区换能器瞬时高程精确数据。4)在广东深圳湾开展GNSS信号盲区换能器瞬时高程精密确定实验,通过对实验区测量高程结果分析对比评定,验证了跨海大桥下GNSS信号盲区换能器瞬时高程基准精密确定方法的有效性。
[Abstract]:The number of cross-sea bridges in China is increasing day by day. The erosion and siltation deformation of the pier and the seabed around the bridge area is an important factor affecting the safety of the bridge body. However, in the monitoring process, the GNSS receiver signal of ship is poor in navigation accuracy or unable to navigate in the bridge area because of being blocked by the bridge body. At the same time, the sea crossing bridge is mostly located in the complex area of tidal variation in the strait or the bay, and the span of the bridge body is longer. It is difficult to obtain accurate tidal level in real time and high resolution near the ship. For the above two reasons, the accuracy of the instantaneous elevation datum of multi-beam acoustic wave emission is poor. In order to solve the above problems, the instantaneous elevation datum of GNSS signal blind area transducer is determined based on the combination system of two ship modes. The following research content: 1) explains the composition and working principle of the two-ship model (No.1 main survey, No.2 GNSS tidal level determination), and explains the characteristics of the combined system in detail. Based on the GNSS tide level data of No. 2 vessel, providing the instantaneous tide level of No. 1 main surveying vessel, the problem of accurate tide level can not be obtained in the GNSS signal blind area is solved. 2) the importance of time synchronization in multi-sensor system is expounded in detail. Using UTC time as reference, GNSS and attitude sensor are unified based on vertical feature matching of multi-source signals, and GNSS and attitude data are matched based on spline interpolation function. Based on the interpolation extrapolation method, the pressure sensor draught data and GNSS time are matched, which effectively solves the multi-sensor time synchronization problem. The effect of spatial data processing on the instantaneous elevation accuracy of GNSS signal blind area transducer is analyzed carefully. For each data processing link: the GNSS elevation signal quality control research; based on shipboard pressure sensor draught correction research; based on shipboard attitude sensor attitude correction research; based on fast Fourier transform tidal level determination research. On the basis of the above spatial data research, the instantaneous elevation precision data of GNSS signal blind area transducer under the sea crossing bridge. 4) is carried out in Shenzhen Bay, Guangdong Province, where the instantaneous elevation precision determination experiment of GNSS signal blind area transducer is carried out. Through the analysis and evaluation of the measured elevation in the experimental area, the validity of the precision determination method of instantaneous elevation datum of GNSS signal blind area transducer under the sea crossing bridge is verified.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U666.1;P228.4

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