Beihang University

Xiaobin Xu

Xiaoyang Wang

Ningfang Song

Fuyu Gao

Han Li

Lin Chen

Jing Jin

Wei Cai

Rui Zhou

Zhihao Zhang

Chen Wei

Yongbin Sun

Lun Fei

Mengzhen Huo

Huaxin Qiu

Daifeng Zhang

Yankai Shen

Ning Xian

Yunhao Zhu

Haibin Duan

Yimin Deng

Long Xin

A bionic visual navigation control system for autonomous aerial refueling docking includes: a tanker/receiver bottom layer control module, a multi-wind disturbances hose-drogue stable control module, an enable and select module, a close-range bionic vision relative navigation module, and a receiver relative position precise control module. A bionic visual navigation control method for autonomous aerial refueling docking is also provided. The present invention aims at improving the reliability, anti-interference and accuracy of the close-range relative navigation in the autonomous air refueling docking stage, and designs a matching relative position accurate control method with control switch, thereby improving the accuracy of close-range navigation and control, thereby promoting the successful realization of probe-and-drogue autonomous aerial refueling and improving the autonomy of UAVs.

Bionic visual navigation control system and method thereof for autonomous aerial refueling docking

A hollow-core antiresonant fiber (HC-ARF) with nested supporting rings (NSRs) has a fiber structure that includes from the inside out a fiber core, a first silica antiresonant ring (SARR), a first air antiresonant ring (AARR), a second SARR, a second AARR and an external silica wall. The fiber structure further includes a first NSR within the first AARR and a second NSR within the second AARR. The HC-ARF with NSRs has advantages and benefits of low confined loss (CL), large bandwidth, simple structure and very good bending characteristics. Therefore, the application fields of HC-ARF are greatly expanded.

Hollow-core antiresonant fiber with nested supporting rings and its design method

The nondestructive determination of core size of a hollow-core photonic bandgap fiber (HC-PBF) using Fabry-Perot (FP) interference is performed with an apparatus including a tunable laser source (TLS), a 1&#xd7;2 single-mode (SM) coupler, an SM collimator, a six-axis translation stage, an optical detector, and an oscilloscope. The light from the TLS passes through the 1&#xd7;2 SM coupler and the SM collimator to perpendicularly enter two parallel air-SiOinterfaces of the core of the fiber and is reflected, while the TLS is tuned from one wavelength to another. Then the reflected spectrum is guided to the optical detector, where its interference intensity is converted into voltage intensity to be displayed at the oscillator and fitted with a least-squares method to obtain the distance between the two air-SiOinterfaces. The core size of the fiber can be obtained by rotating the fiber and repeating the procedure at multiple angular positions.

Method and apparatus for nondestructive determination of core size of hollow-core photonic bandgap fiber using Fabry-Perot interference

Growing community of inventors

Beijing, China

Xiaobin Xu