Ka频段双模航空客舱宽带卫星通信系统总体设计

针对民航市场对客舱宽带卫星通信的迫切需求，提出了一种基于Ka频段高通量卫星的双模解决方案。研究了系统设计的诸多方面，包括卫星资源选择、网络结构、技术体制和适航性。详细介绍了机载设备的组成和双模工作原理，分析了几个与设计实现密切相关的技术指标。方案设计和技术指标分析结果对实际工程应用有一定的参考价值。     

The promise and peril of dynamic targeted pricing

Dynamic pricing is widely adopted in many industries, such as travel and insurance. These industries are also gaining extensive capabilities in identifying and segmenting customers, partly fueled by the increasing availability of data. It is natural to ask whether firms should take advantage of such developments by charging different prices to different customer segments. If so, under what conditions? We seek answers to these highly managerially relevant questions.We consider a market with two customer segments served by a monopolist. The monopolist can choose among a set of pricing strategies to exploit consumers’ inter-temporal preferences and/or inter-segment variations. At one end of the spectrum, the firm can charge a constant price to all customers, which is called static pricing. At the other end of the spectrum, the firm can charge different prices to different customer segments and vary these prices over time, which is referred to as dynamic targeted pricing. We systematically compare these alternative pricing strategies. We show that dynamic pricing without targeting can be more effective than static targeted pricing when customers are not very forward looking, which corroborates the findings in the empirical literature. Interestingly, we find that the monopolist can be worse off when she adopts targeting in addition to dynamic pricing. We conduct laboratory experiments to test several key model predictions. The studies show that individuals behave in a manner consistent with the predictions of our model.     

Premium auctions and risk preferences: An experimental study

In premium auctions, the highest losing bidder receives a reward from the seller. This paper studies the private value English premium auction (EPA) for different risk attitudes of bidders. We explicitly derive the symmetric equilibrium for bidders with CARA utilities and conduct an experimental study to test the theoretical predictions. In our experiment, subjects are sorted into risk-averse and risk-loving groups. We find that revenues in the EPA are significantly higher when bidders are risk loving rather than risk averse. These results are partly consistent with theory and confirm the general view that bidders' risk preferences constitute an important factor that affects bidding behavior and consequently also the seller's expected revenue. However, individual subjects rarely follow the equilibrium strategy and revenue in our experiment is lower than in the symmetric equilibrium.     

资本市场的实验经济学方法论研究

随着金融市场理论研究和实践检验的不断发展，资本市场的许多基础理论受到了极大的挑战，与现有理论相悖的异象不断涌现。新近兴起的实验经济学为人们研究资本市场提供了一条更为有效的途径。本文分析了实验方法在资本市场研究中的利与弊，介绍了部分资本市场实验的设计过程，并应用该方法分析了风险与收益、资本市场的效率、市场泡沫的产生和破灭、CAPM理论，以及交易制度等。文章指出，在资本市场中运用实验方法进行研究，具有可控性、可比性以及可重复性等优点，为我们对于资本市场诸多理论进行检验提供了可能。在资本市场实验的设计中，我们不但需要考虑实验的各种交易制度，还需要考虑到被试人员的选择、交易资产的确定以及市场信息的设计等很多问题，只有对这些问题进行全面地考虑，才能保证实验结果的可信度，进而为我们对于各种金融理论的检验提供可能。     

一种新的卫星通信信号快速盲检测方法

提出了一种卫星通信信号快速盲检测算法,该算法能够适应频谱不重叠的多信号环 境,并能准确估计信号的数量、中心频率及带宽等参数。算法既高效又简单,所需数据量少 且适应低信噪比条件,适于在星载设备上实现。理论分析和仿真及测试结果证明了算法的有 效 性。     

信号与系统实验课程教学改革的研究与探索

分析了目前信号与系统实验课程存在的问题,结合多年从事信号与系统实验教学经验,提出一系列改革方案。实践证明这些方法有助于提高教学质量,增强学生的学习兴趣,逐步培养学生的创新意识,促进了对学生综合能力的培养。     

Trust, reputation and relationships in grazing rights markets: An experimental economic study

Trust is frequently a requirement for economic exchanges and the management of natural resources. Providing public information on past actions can promote trust through the formation of reputations. We developed an economic experiment to test whether a formal reputation mechanism could facilitate trusting relationships in the tradable grazing rights markets. Providing information to create formal public reputations for market participants did not increase the overall efficiency of the market. However, it did result in greater equality of income between partners, suggesting that participants showed more concern for their partners when they knew they would be rated. Even with public reputation information, bilateral relationships remained central to the market. Market failures in existing grazing rights markets may be better addressed by measures to increase communication between partners rather than simply relying on a formal reputation mechanism.     

再生式通信卫星转发器的研究进展

随着星上高速数据处理与交换的需求不断增加,再生式通信卫星转发器逐渐成为研究 热点。概述了几种典型的再生式转发器国内外最新研究进展,指出了其信息处理、交换技术 发 展中存在的主要问题,包括多载波解调、吞吐量较低以及微波/光调制等,在此基础上提出 了合适的补偿技术、星上半透明突发交换、光副载波调制以及波分复用等针对性的解决方法 ,可为我国卫星转发器设计以及星上信息处理、交换等关键技术研究提供参考。     

基于ADS-B报文的“北斗”便携式终端实现

针对单个广播式自动相关监视（Automatic Dependent Surveillance-Broadcast,ADS-B）发射机传输距离受限、多地面站组网复杂以及成本较高等问题,在分析ADS-B报文编码与解码算法的基础上,探讨了基于无线网络传输的ADS-B报文信息技术,并设计了基于“北斗”卫星导航（BeiDou Satellite Navigation System,BDS）/嵌入式控制器以及无线网络的便携式监视终端系统。利用实测ADS-B数据联合搭建的监视中心对算法和系统进行测试,结果表明数据传输稳定,实现了低空空域通用航空飞机ADS-B态势信息的网络传输功能,丰富了监视信息的链路传输方式,为低空通航飞行器安全飞行和全面监视提供了新的方法。     

微纳卫星组网星间链路设计及关键技术分析

微纳卫星组网应用可大幅度提高航天装备的能力,较单颗大卫星具有明显的优势。首先,介绍了国内外微纳卫星组网的研究情况,以组网侦察应用为例分析了星间测量与通信链路的技术需求,并进行了系统架构和体制设计;其次,在星座设计基础上开展系统仿真,并提出了一体化设备实现方案;最后,分析了微纳卫星组网系统中几项重要的关键技术及其解决方案,对系统的设计和工程实现具有参考价值。