摘要
研究了直升机作海面低高度（１５ｍ）悬停时获取精确高度的维纳滤波组合系统。高度量测来自捷联垂直加速度计和无线电高度表。维纳滤波器根据海浪、无线电高度表噪声和加速度计噪声三种随机干扰的功率谱采用伯特一香农设计法获得。对组合系统作了五种环境下的滤波仿真，结果表明：该系统既能有效滤除上述三种干扰，又能准确跟踪悬停高度的变化。
An integrated navigation system is studied in which the accurate height of a helicopter hovering over the sea about l5m is estimated optimally via the Wiener filter.The height measurements are from a strapdown vertical accelerometer and a radio altimeter.The Wiener fil-ter is desigued by means of Bode-Shannon method according to the power spectral densities of random interferenees such as sea waves,radio altimeter noises and accelerometer noises.The in-tegra ted system is simulated under five different cireumstances to test its efrlciency.The results show that the system can attenuate three interferences mentioned above effectively and can track the change of the hovering height quite satisfactorily.
出处
《航空学报》
EI
CAS
CSCD
北大核心
1994年第11期1341-1347,共7页
Acta Aeronautica et Astronautica Sinica
关键词
维纳滤波
直升机
悬停
飞行力学
Wiener filtering,helicopters,hovering,height
