Improved instantneous frequency estimation using an adaptive short-time fourier transform

Formation training and natural interaction between pilot and cockpit are two key technology issues for developing flight simulator A lightweight flight simulator system was developed with virtual–real cockpit view using mixed reality technology First innovation of the system is that a fusion approach of virtual-real scene, based on multiple fixed cameras (MFC), was proposed to superimpose real image streams of cockpit interaction area on virtual graphics of cockpit environment using 2D four points texture mapping Second one is to simulate formation training realistically The results of primary test show that the developed lightweight flight simulator is an important complement to current large flight simulator due to its strong enhancement of understanding cockpit environment, effective improvement of natural interaction capability between pilot and cockpit and special predominance over other in terms of multiple planes training such as formation training

Novel, Lightweight Flight Simulator System Based on Mixed Reality

To solve problems of ergonomic evaluation in cockpit collaborative design(co-design), it needs to design shared ergonomic evaluation system to rapid response ergonomic requirements of cockpit co-design, and which it can be used for real-time dynamic evaluation by participants in every iterative interval. A design of Cockpit Ergonomic Evaluation Simulation System(C2ES) is proposed and research in ARtoolkit development platform. The C2ES, which based on specific demand of aviation cockpit ergonomic evaluation, has been designed a modified configuration in typical video see-through augmented reality system. Its design achieved two majors' parts, which one is infrared camera and infrared marker to track head movements, and another is mixture of synthetic instrument and cockpit physical model by visual registration algorithm. The C2ES, whose underlying infrastructure come from mature algorithm and typical system has preferable robustness and practicability of cockpit ergonomic evaluation. Verification experiments show that it can be as a platform to simulate more layout change in cockpit which will then achieve knowledge sharing and find commonalities. For the new ergonomic design conflict that get unveiled, build on them further to conflict resolution.

Design of Cockpit Ergonomic Evaluation Simulation System Based on Augmented Reality

In response to the problem of weak chirp signal detection, a method based on Short-time Fourier transform (STFT) and cubic spline interpolation is proposed. The scheme mainly exploits the continuous time-frequency characteristic of chirp signals to extract them from background noise. To be specific, we short-time Fourier transform the input signals into coherent integration of frequency-shift sample sequences which are with complex envelopes, then achieve a time-frequency curve and numerically analyze it with cubic spline interpolation, in order to eliminate the noise to the utmost extent as well as to detect chirp signals effectively. The algorithm remains available in quite a low signal-to-noise (SNR) with low complexity. Simulation results show its fine detection performance in -18dB condition, which can meet the demand of electronic reconnaissance.

Guowei Shi

Papers

Design of Cockpit Ergonomic Evaluation Simulation System Based on Augmented Reality

Research on Weak Chirp Signal Detection Based on Cubic Spline Interpolation