Acousto-optic spectrum analyzer techniques for monitoring CW

The issues associated with processing the outputs of an integrating acoustooptical spectrum analyzer (AOSA) to detect and identify the frequency and power of continuous wave (CW) signals are considered. The performance of the optimum detection strategy is presented, along with the Cramer-Rao bound on the performance of estimators of the frequency, and the performance of a simple peak-based frequency estimator. The performance of the maximum likelihood (ML) estimator of the power level is also presented. The results provide the behavior of the system as a function of the product of the aperture time and photodetector spacing amongst other parameters     

Shared situation awareness in the flight deck-ATC system

The comparison of pilots' and controllers' goals and situation awareness information requirements has revealed many parallels at the higher levels. At the more detailed, lower levels, however, subtle underlying differences were identified that lend insight into their decisions. The preliminary experimental results indicate that situation awareness was improved when information was shared between the cockpit and the ground. Pilots' traffic situation awareness improved when traffic information was displayed; controllers' weather situation awareness improved when weather information was displayed. Operational errors were reduced in the process. Pilots and controllers also exhibited behavioral changes. When information was shared, controllers provided more frequent weather advisories to pilots. Pilots and controllers were more likely to suggest preferred route amendment alternatives to their counterparts, and re-route negotiation increased in the process. Based on these preliminary results, it appears that shared information between flight crews and air traffic controllers may be beneficial in terms of improved situation awareness and the behaviors it appears to foster     

超级性价比激光切割机 Minter 3015

法利莱作为世界切割焊接技术领先的企业,以其雄厚的技术实力和独有的品牌魅力吸引着众多的拥趸者。近几年,法利莱一直致力于推动激光行业的发展,普及激光的大众化应用。