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tercom n.【軍事】地形匹配系統〔巡航導彈內部按照地形起伏控制飛...

terebene

The first algorithm is low precise but simple and credible , the second is high precise but complex and incredible . 4 ) developed four kinds of methods aimed to improve precision and credibility of navigation system . the first is parallel sandia inertia terrain - aided navigation ( psitan ) ; the second is tercom + sitan , it can restrain two important disadvantages of sitan ; the third is particle filter - based terrain - aided navigation ( pftan ) , the particle filter can reduce the error of navigation ; the last is tercom + pftan , where tercom is looked as monitor to ensure the credibility of navigation system 采用并行sitan方法來提高導航精度,并克服奇異值問題;提出了tercom + sitan方法,綜合利用兩者的優點,在保持sitan導航精度的前提下,有效地克服了sitan的兩個缺點;提出了一種基于連續蒙特卡洛濾波(常被稱為particlefilter )的地形匹配算法( pftan ) ,有效地克服了利用sitan時由于地形隨機線性化帶來的誤差,使導航精度有較大的提高;提出了tercom作為監視器的地形輔助導航思想,并將其應用到連續蒙特卡洛方法上,較大地增加了系統的可靠性和精度。

In this paper , the main research works are as follows : 1 ) survey and analysis previous work in auv navigation and summarize : as the cumulate error , the dead - reckoning and inertial navigation systems ca n ' t be used without other modified system ; the acoustic navigation system is used only in small range , and is very expensive . 2 ) two important approaches in geophysical navigation techniques are summarized , one is terrain contour based navigation , this approach is investigated keystone today ; the other is image based navigation , due to no perfect image sensors and image seabed map , this approach has seldom been practised . 3 ) two important terrain contour based navigation algorithms has been applied to auv , one is match algorithm - based terrain contour match ( tercom ) ; the other is kalman filter - based sandia inertia terrain - aided navigation ( sitan ) 主要研究內容包括:一、總結分析了當前水下導航的常用方法和不足之處,指出基于航位推算的導航方法,存在著最大的問題就是導航誤差的積累問題,如果沒有修正系統,這種方法很難滿足使用要求;其次指出基于聲學的導航方法,造價昂貴,導航范圍有限,難以滿足自主水下航行器大范圍導航的需求;二、總結了當前水下地形輔助導航的主要技術路線,一是基于地形高程的匹配方法,這是當前研究的重點;二是基于地形圖像的匹配方法,由于缺乏良好的圖像傳感器,和可用的海底圖像地圖,目前這種方法還有待研究發展;三、將兩種地形高程匹配的常用方法應用到自主水下航行器上:以相關算法為前提的地形輪廓匹配( tercom )方法和以卡爾曼濾波為基礎的桑迪亞慣性地形輔助導航( sitan )方法,前者算法簡單可靠,但是導航精度不高,后者雖然精度比較高,但存在著算法較為復雜、有可能發散和出現奇異值等問題。

This paper also discusses theories , characters , applications of the three following algorithms of terrain matching system : terrain contour matching ( tercom ) , terrain - aided inertial navigation system , wavelet transform , the simulation results are provided 論文先后討論了地形輪廓匹配算法、卡爾曼濾波地形輔助導航算法、小波分層算法的原理、特點、適用范圍,做了仿真研究,比較了它們的匹配性能和相關特點。

Terrain contour matching tercom 地形輪廓匹配