导弹与航天运载技术
導彈與航天運載技術
도탄여항천운재기술
MISSILES AND SPACE VEHICLES
2014年
2期
54-57,64
,共5页
赵国荣%黄婧丽%杨飞%林克全
趙國榮%黃婧麗%楊飛%林剋全
조국영%황청려%양비%림극전
矩谐模型%小尺度区域%非线性噪声估计器%惯性地磁组合导航
矩諧模型%小呎度區域%非線性譟聲估計器%慣性地磁組閤導航
구해모형%소척도구역%비선성조성고계기%관성지자조합도항
Rectangular harmonic model%Small-scale area%Nonlinear noise estimator%Inertial geomagnetic integrated navigation
为了降低模型因素引起的导航误差,实现小尺度区域下载体的高精度导航,将矩谐模型代替原有的偶极子地球主磁场模型,作为惯性/地磁组合导航系统的观测方程。同时,考虑到实际环境中复杂的磁场干扰及其未知的统计特性,避免线性化观测方程时计算雅克比矩阵,采用UKF滤波算法设计一种非线性时变噪声估计器,降低磁场干扰带来的影响,提高导航估计的精度。仿真结果显示,该算法提高了组合导航的精度,可以应用在噪声较大的环境中。
為瞭降低模型因素引起的導航誤差,實現小呎度區域下載體的高精度導航,將矩諧模型代替原有的偶極子地毬主磁場模型,作為慣性/地磁組閤導航繫統的觀測方程。同時,攷慮到實際環境中複雜的磁場榦擾及其未知的統計特性,避免線性化觀測方程時計算雅剋比矩陣,採用UKF濾波算法設計一種非線性時變譟聲估計器,降低磁場榦擾帶來的影響,提高導航估計的精度。倣真結果顯示,該算法提高瞭組閤導航的精度,可以應用在譟聲較大的環境中。
위료강저모형인소인기적도항오차,실현소척도구역하재체적고정도도항,장구해모형대체원유적우겁자지구주자장모형,작위관성/지자조합도항계통적관측방정。동시,고필도실제배경중복잡적자장간우급기미지적통계특성,피면선성화관측방정시계산아극비구진,채용UKF려파산법설계일충비선성시변조성고계기,강저자장간우대래적영향,제고도항고계적정도。방진결과현시,해산법제고료조합도항적정도,가이응용재조성교대적배경중。
In order to reduce the navigational error caused by the model factors and achieve high-precision navigation in small-scale areas, the original Earth's main magnetic field model created by the dipole is replaced by rectangular harmonic model as the INS/GNS integrated navigation system observation equation. At the same time, taking into account the complex magnetic interference in the actual environment and its unknown statistical properties, to avoid calculating the Jacobian matrix in linearizing the observation equation, the UKF algorithm is adopted in the design of a nonlinear time-varying noise estimator to reduce magnetic interference and improve the accuracy of navigation. The simulation results show that the algorithm greatly improves the accuracy of the integrated navigation. It can be used in noisy environment.