基于姿态随动技术的直升机低高度测量

Helicopter low altitude measurement based onattitude following technology

摘要:

在飞行试验中悬停性能是直升机性能的重要试飞科目。该科目科研试飞鉴定要求有大量的样本数据(海拔、温度、重量、构形的组合)以获取比较准确的试验结论。其中,离地高度是悬停科目试飞与小速度科目试飞中的关键参数。直升机的低高度信息通常由气压式高度传感器、无线电高度表获取。由于受到地面效应、姿态、风速风向等诸多因素的干扰,从而无法保证高精度和可靠性。激光测距逐渐成为一种先进的测量手段应用于直升机低高度测量中。但是在具体实施过程中由于直升机机动飞行姿态变化导致激光高度测量的误差增大与失效。通过机载姿态跟随技术研究不仅克服了直升机机动状态下姿态变化引起的低高度测量误差与失效,而且可由机载综合采集系统将低高度数据融合,实时发送给地面站遥测接收与存储,可以极大扩充数据样本,从而获取比较准确的试验结论。

Abstract:

In flight test, hovering performance is an important test subject for helicopter performance. The scientific research flight test of this subject requires a large number of sample data (altitude, temperature, weight, configuration combination) to get more accurate test conclusions. Among them, the ground height is the key parameter of hover test and small speed flight test. Low altitude information of helicopter is usually obtained by air pressure height sensor and radio altimeter. Due to many disturbances such as ground effect, posture, wind speed and wind direction, the high accuracy and reliability can,t be guaranteed. Laser ranging has gradually become an advanced measurement method for helicopter low altitude measurement. But in the specific implementation process, the error of laser height measurement increases and fails due to the change of helicopter maneuvering flight attitude. The airborne attitude follow technology not only overcomes the low altitude measurement error and failure caused by the attitude change in the helicopter"s maneuver state, but also combines the low altitude data by the airborne integrated acquisition system and sends it to the ground station telemetry receiving and storage in real time. It can greatly expand the data samples and obtain more accurate data. The conclusion of the test.