CAJ | 학술논문

接收机自主完好性监测( receiver autonomous integrity monitoring, RAIM)算法因具备独立自主、快速告警等优点被广泛应用于航空领域。由于传统RAIM算法仅在故障星出现粗大伪距偏差时才具备较高的检测与识别率,因此难以满足高精密航空飞行安全需求。为了提升完好性水平,从改善卫星空间构型与提升测距精度出发,提出一种组合星座双频RAIM算法。该算法建立了北斗/GPS双频伪距观测模型,在考虑同颗卫星双频信号伪距观测噪声相关性与伪距偏差在不同频点间扩散现象的条件下,继承奇偶矢量方法实现了故障检测与识别,提高了算法对于小伪距偏差的敏感度,图形与数据化仿真结果证明了该算法的有效性与可行性。
접수궤자주완호성감측( receiver autonomous integrity monitoring, RAIM)산법인구비독립자주、쾌속고경등우점피엄범응용우항공영역。유우전통RAIM산법부재고장성출현조대위거편차시재구비교고적검측여식별솔,인차난이만족고정밀항공비행안전수구。위료제승완호성수평,종개선위성공간구형여제승측거정도출발,제출일충조합성좌쌍빈RAIM산법。해산법건립료북두/GPS쌍빈위거관측모형,재고필동과위성쌍빈신호위거관측조성상관성여위거편차재불동빈점간확산현상적조건하,계승기우시량방법실현료고장검측여식별,제고료산법대우소위거편차적민감도,도형여수거화방진결과증명료해산법적유효성여가행성。
RAIM algorithm which has the advantages of independence and quick alarm is widely used in aviation. Since traditional RAIM algorithm has high detection and recognition rate only when fault satellite appears bulky pseudorange deviation, it is difficult to meet the de-mand of high precision flight safety. In order to improve the integrity, through improving satellite space configuration and the precision of distance measurement, a combination constellation double-frequency RAIM algorithm put forward. It has established the BDS/GPS dual-frequency pseudorange observation model, considering satellite dual-frequency signal pseudorange observation noise correlation and devia-tion between different frequency point diffusion phenomenon, to inherit the parity vector method for fault detection and recognition, the sen-sitivity of the algorithm for small pseudorange deviation. The graphic and numeral simulation results demonstrate that the method is effective and feasible.