软件
軟件
연건
SOFT WARE
2014年
1期
26-31
,共6页
几何精度因子(GDOP)%多星座导航%卫星选星%最优几何%模糊综合评判
幾何精度因子(GDOP)%多星座導航%衛星選星%最優幾何%模糊綜閤評判
궤하정도인자(GDOP)%다성좌도항%위성선성%최우궤하%모호종합평판
GDOP(Geometric Dilution of Precision)%multi-constellation navigation%satellite selection%optimal geometry%fuzzy comprehensive evaluation
随着多星座卫星导航技术的发展,卫星选星算法也日趋重要。为了保证导航定位解算的实时处理能力,在所有可见卫星中合理选取部分卫星用于定位解算,是十分必要的。本文提出了一种基于最优几何分布的改进型选星算法,能够选取多于四颗的卫星用于定位,且卫星几何分布近似最优。算法基于最优几何分布,并利用了模糊综合评判来降低GDOP值的计算次数,减少接收机计算负担。仿真结果表明,改进型选星算法较最优几何分布选星算法在GDOP值上增大不多,而GDOP值的计算次数却能显著地降低,因此提升了接收机实时处理能力。
隨著多星座衛星導航技術的髮展,衛星選星算法也日趨重要。為瞭保證導航定位解算的實時處理能力,在所有可見衛星中閤理選取部分衛星用于定位解算,是十分必要的。本文提齣瞭一種基于最優幾何分佈的改進型選星算法,能夠選取多于四顆的衛星用于定位,且衛星幾何分佈近似最優。算法基于最優幾何分佈,併利用瞭模糊綜閤評判來降低GDOP值的計算次數,減少接收機計算負擔。倣真結果錶明,改進型選星算法較最優幾何分佈選星算法在GDOP值上增大不多,而GDOP值的計算次數卻能顯著地降低,因此提升瞭接收機實時處理能力。
수착다성좌위성도항기술적발전,위성선성산법야일추중요。위료보증도항정위해산적실시처리능력,재소유가견위성중합리선취부분위성용우정위해산,시십분필요적。본문제출료일충기우최우궤하분포적개진형선성산법,능구선취다우사과적위성용우정위,차위성궤하분포근사최우。산법기우최우궤하분포,병이용료모호종합평판래강저GDOP치적계산차수,감소접수궤계산부담。방진결과표명,개진형선성산법교최우궤하분포선성산법재GDOP치상증대불다,이GDOP치적계산차수각능현저지강저,인차제승료접수궤실시처리능력。
Satellite selection algorithm is becoming more and more important with the advent of multi-constellation navigation. To obtain real-time processing, it’s essential to limit the number of satellites used for positioning computation among all visible satellites. In this paper, we propose an improved algorithm to select more than four satellites whose geometry is similar to the optimal geometry. Moreover, the computation burden is further lower by limiting the number of times to calculate GDOP value referring to fuzzy comprehensive evaluation method. Simulation shows that the proposed algorithm can get a GDOP value close to the minimal GDOP using traditional optimal algorithm, in spite of a little increase relative to the original algorithm based on optimal geometry, but the number of times to calculate GDOP value is obviously decreased.