基于GNSS速度信息辅助的飞行器姿态保持技术研究

Research on Aircraft Attitude Hold Scheme with GNSS Velocity Information

关键词:  GNSS  飞行器  姿态保持

Key words:  GNSS  Aircraft  Attitudehold

摘要:

为了提高飞行器精确打击和侦察探测能力,针对飞行器组合导航系统高精度、长航时和高可靠的姿态保持问题,研究了一种基于GNSS速度信息辅助的飞行器姿态保持技术。通过采用开环修正和闭环修正结合的工作方式,克服了惯性导航误差随时间不断积累引起的滤波精度下降问题;通过对GNSS信息进行χ2 检测,避免飞行器作大机动飞行或有外部干扰时引起的GNSS信息异常,确保GNSS信息的有效性;通过对GNSS速度信息的时间延迟进行扩展建模,抑制GNSS数据延迟对姿态保持算法的影响。仿真和实际数据处理结果表明:该姿态保持技术充分利用惯性导航系统和GNSS的优点,技术方案合理,能够满足飞行器高精度、长航时和高可靠姿态保持的需求,具有较好的工程应用价值。

Abstract:

In order to improve the precision attack ability and investigation detection ability of aircraft, toward the attitude hold problem of high precision, long endurance and high reliable of aircraft navigation system, an aircraft attitude hold scheme with GNSS velocity information is proposed. The combination of open-loop correction and closed-loop correction is adopted to suppress filter precision decline due to inertial navigation error which accumulates with time. The χ2 test method is used to avoid GNSS information abnormity during high maneuver fight and external disturbances and to ensure the validity of GNSS infomation. The extensible modeling on time-delay of GNSS velocity information is used to restrain the influence of time-delay of GNSS velocity information on attitude hold algorithm. The simulation and data processing results demonstrate that, based on the advantages of GNSS and INS(inertial navigation system), the attitude hold scheme meets the requirement of high precision, long endurance and high reliable attitude hold of aircraft, which has a favorable engineering value.