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class="content"> <div class="news_xaingxi"><h1>重庆兰空反无人机--影响无h机成果精度三大要?/h1></div> <div class="news_author"> 来源Q?a href='http://www.cialisydyq.com/news/67.html'>http://www.cialisydyq.com/news/67.html</a>   发布旉Q?018-11-28 </div> <div class="news_content"> <p><p> <a target="_blank" href="http://www.cialisydyq.com/news/67.html">重庆兰空反无人机--影响无h机成果精度三大要?/a> </p> <p> 一、无人机航空摄媄量概述<br /> 低空数字航空摄媄量相对传统摄媄量来说Q机动快速,操作单,云下摄媄Q能获取高分辨率航空影像Q媄像制作周期短Q效率高Q成本低Q在应急测l、困隑֜区测l、小城镇绘、重大工E项目测l、小范围高精度测l应用广泛?<br /> 但是Q固定翼无hI摄׃量系l采用的传感器是由工业CCD 改装的相机。这U相Zؓ非测量相机,较之传统的测l航I摄׃惑器Q存在着光学畸变差CCD阵面非正交性所产生的误差。另外,׃CCD阵面为非正方形,其摄影机的放|方式也影响实际航空摄媄的基UK度。再加上后期像控点联,立体量测的误差,形成了媄像无人机航空摄媄量最l品质量的主要因素?br /> 二、媄响无人机航测_ֺ的几大要?<br /> 固定无人机航空量pȝ在进行地形测量时Q存在着量误差。这些误差主要来源于仪器误差、h差、气候等外界因素影响产生的误差?<br /> a、A器误?br /> ׃仪器设计、制作不完善Q或l校验还存在D余误差。这部分误差主要是传感器量化q程带来的系l误差?<br /> ׃固定无人机的蝲重及体积的原因,无法搭蝲常规的航摄Aq行绘航空摄媄Q自前选用的是中幅面CCD作ؓ传感器的感光单元Q经q加固和电\改装以后Q成为具有稳定内方h元烦Ҏ码相机。由于感光单元的非正方Ş因子和非正交性以及畸变差的存在,畸变差的存在使测量成果无法满精度要求?br /> 型数码相机一般均为矩形阵面的CCDQƈ非传l的正方形。像片重叠度大基线短Q基高比小Q正常情况下Q其基高比ؓ0.15左右Q远于传统摄媄?.50Q在立体模型下,同名地物交会角较,降低了立体观效果,直接影响高程量测_ֺ。如果在保证h三度重叠的前提下Q尽量减相片重叠度或CCD阵面的长边与摄媄航线怸_可以大大增加基高比,提高高程量测_ֺ<br /> b、h?br /> ׃人的感官鉴别能力、技术水q_工作态度因素带来的误差,以及像控识别、空三加密、立体采集生的Zؓ误差?<br /> 像控点精度有刺点_ֺ和观精度。在观测_ֺW合设计要求的情况下Q刺点精度成为媄响像片控制测量精度的主要因素。由于固定翼无h机的像幅较小Q可供选择像控点位的范围相对较,l常会出现在像控点布讄范围内找不到明显地物刺点Q尤其是在野外居民地E地区,像控炚w刺在地物棱角是否明显,影像反差是否理想的地点,都是制约像控点精度的因素?<br /> 外业像控Ҏ量时Q对目标点的选取主要取决于媄像纹理的丰富E度Q媄像纹理粗p、弧形地物、线状地物交角不好,直接影响了外业点位选取_ֺQ同时内业对像控点的转刺同样有较大的误差Q较低了成图_ֺ。如果采取先布设地面目标点后摄媄Q则能较大提高外业选点_ֺ和内业{刺点_ֺQ有助于提高成图质量?<br /> 内业数据采集分ؓIZ加密与立体量。像控点识别与判d会与外业实际位置产生一定的误差Q空三加密时也会有一定的误差Q还有在立体采集量测时切的误差{等?br /> c、外界因?br /> ׃天气状况寚w行器姿态和成像质量的媄响生的误差?br /> Ҏ影成像来_景物亮度的大只影响像片上的曝光量,重要的是像片上相d物媄像之间的密度差,如果地物影像之间没有密度差异Q也是没有影像反差Q也无法从影像上L别地物,而决定媄像反差的因素除了景物本n特征外,主要取决于阳光部分和阴媄部分照度之间的差异,如果选择天气条g不好时摄影,必然使媄像质量变差?<br /> 微型无hZU较,一般都在三十公斤之内,在摄影时受气、风力、风向媄响较大,无法保持直线q稳飞行Q航U倾角、旁向倾角和旋转角都很大,飞行姿态难以控Ӟ飞机在航U前后左右等方向上摆动造成了媄像模p,影像了清晰度。另外,׃遥控无h机采用低I飞行,航高较低Q相对地面物体移动速度较快Q在曝光q程中,成像面上的地物构像随之生位U,形成像移Q像Uȝ出现同样使媄像模p,影响了成像质量?br />    </p></p> </div> <div class="pagess"> <ul><div>上一?<a href="68.html">绘无h操步骤介绍--重庆兰空反无人机</a></div> <div>下一?<a href="66.html">如今反无人机技术有哪些</a></div> </ul> </div> <div class="info_key">相关标签Q?/div> </div> <div class="clear"></div> <div class="cateslist"> <dl> <dt>相关产品</dt> <dd> <div class="img"> <a href="/supply/66.html" title="便携式无人机防M" rel="nofollow"><img src="http://cmsimgshow.zhuchao.cc/29779/202008101427238942977969679.jpg?path=www.cialisydyq.com/uploads/cp/202008101427238942977969679.jpg" title="便携式无人机防M" alt="便携式无人机防M"/></a> </div> <div class="txt"> <a href="/supply/66.html" title="便携式无人机防M" rel="nofollow">便携式无人机防M</a> </div> </dd> <dd> <div class="img"> <a href="/supply/65.html" title="便携式轻便无人机防M? rel="nofollow"><img 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