舰船卫星探测实验中利用AIS获取现场同步数据的可行性分析  

Feasibility Analysis of Using AIS to Acquire Synchronous In-situ Data in the Ship Detection Experiment

作　　者：张婷[1] 张杰[1] 张晰[1] 孟俊敏[1] 

机构地区：[1]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《海岸工程》2013年第4期48-55,共8页Coastal Engineering

基　　金：国家海洋局海洋公益性行业科研专项--海上非法舰船SAR和地波雷达立体监视监测应用技术系统(200905029);国家自然科学基金--舰船机载SAR多维度信息提取中的几个技术问题研究(61002048)

摘　　要：在SAR与AIS联合探测探测舰船目标实验中,通过对2010-11-05T06∶51渤海海峡Radarsat-2影像的和与之时空匹配的AIS数据比较,发现2种手段探测到的静止的舰船目标能够精确的匹配,但是运动的舰船目标存在一定的偏差。分析了偏差产生的原因,其中距离向偏差是由时间误差引起的;方位向偏差主要是由多普勒频移造成的;这与运动舰船目标的航速、航向及SAR与AIS的探测时间误差有关。在此基础上建立了数学模型,分析上述参数对偏差的影响,并对偏差加以修正,从而实现了SAR与AIS探测结果的匹配。It has been an important means to detect ship target by using SAR in the mo nitoring of ship targets in a large-scaled sea area. For verifying the accuracy of SAR de tection algorithm, however, the in-situ measured data must be obtained. AIS can pro- vide with various types of information about ships in real time. These can be considered as the in-situ data for validating the SAR detection algorithm. In the ship detection ex periments in which AIS and SAR are jointed, and through the comparison between the Radarsat-2 images of the Bohai Strait obtained at 2010-11-05T06 ： 51 and the AIS data matched spatially and temporally, it was found that the immobile ship targets detected by the two means could be matched precisely, but for the mobile ship targets some er- rors existed. The reasons for the errors are analyzed and the results show that the range error is caused by time error and the azimuth error by Doppler shift. These errors are dependent on the sailing velocity and direction of the mobile ship targets and the error of detecting time between SAR and AIS. To correct the errors, a numerical model is build up, which makes the results detected by SAR and AIS match more accurately.

关 键 词：SAR AIS 舰船探测实验 

分 类 号：P352[天文地球—空间物理学]