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为了解决当前通用航空器监视困难的问题,提出一种基于“北斗”卫星导航的航空监视系统。该系统由便携式机载设备、北斗地面监视指挥中心和数据融合服务器组成。通过对ADS-B技术与北斗短报文通信原理的研究,设计一种同时兼容1090ES数据链和北斗卫星链路的机载终端,能够同时使用“北斗”和GPS双导航源进行定位,利用多链路,实现在北斗卫星信号覆盖范围内的监视数据传输。北斗地面监视指挥中心的双向通信能力弥补了传统ADS-B系统单向传输数据的短板。数据融合服务器将不同格式数据进行融合处理,实现监视数据的稳定显示。研究成果可为ADS-B技术与北斗系统在通航领域的应用推广提供技术参考。 相似文献
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要实现较为通用的异构数据库数据交换只靠数据库本身所提供的软件工具是无法满足这种要求的,采用中间数据仍然是异构数据库数据交换的主要手段。随着XML及其相关技术和应用的发展,XML不仅成为了应用间交换数据的一种标准,也是因特网中重要的信息交换标准和表示的技术之一。 相似文献
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通用航空作为国家战略性新兴产业,承载着调整经济结构、转变经济发展方式、改善民生和升级消费的历史使命。受新冠肺炎疫情的影响,交通、旅游人数显著下降,飞行活动大幅减少,通用航空面临巨大财务风险。本文以A通用航空有限公司为案例,用F分数模型计算A公司财务风险大小,结合国务院国资委发布的《企业绩效评价标准值》,对A公司的财务风险进行识别与进一步的分析,探究财务风险产生的原因,而后针对性地提出具体建议,也希望为日后的通用航空公司经济复苏提供参考价值。 相似文献
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本文简述了我国航空国防行业的特点及现状,针对航空产品研制过程中数据源不统一、数据重用率低、无法事先模拟仿真等问题,提出应用MBD技术打通数据重用通道,开展基于模型的结构化工艺设计模式的研究和探讨,以期从根本上提高效率、提升产品质量。 相似文献
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10月28日上午10:30,中国南方航空子公司重庆航空第一架自主进行A检的空客A320飞机顺利出厂,标志着重庆航空成为重庆市首个能自主完成空客A320系列机型A检项目的基地航空公司。 相似文献
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本文通过对江苏高校图书馆建设学科导航数据库进行调查研究,分析了以建立高质量的网络资源学科导航库为基础的"统一平台,统一标准,合作建设、分头维护,集中管理、全省共享"的建库模式及其作用和意义。 相似文献
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This paper investigates what motivates intergenerational inter-vivos time and money transfers. We consider a model in which transfers may be driven not only by altruism, but also by exchange considerations. We use data from the Survey of Health, Ageing and Retirement in Europe to discriminate between the two motives. We show that both if we consider money transfers from parents to children and time transfers from children to parents, the empirical evidence rejects pure altruism in favor of exchange. This result has important policy implications on the effectiveness of formal care provision as a substitute for informal care and on the impact of taxation on transfers. 相似文献
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Miaojie Yu 《Journal of Asian Economics》2009,20(6):655-668
The literature had paid little attention to the endogenous nexus between exchange rates and bilateral trade. In this paper, I use a gravity model to investigate the two-way causality between exchange rates and bilateral trade with data from China, Japan, and the United States during the 2002–2007 period. After controlling for the simultaneous bias between exchange rates and bilateral trade, the extensive empirical evidence shows that the revaluation of the Chinese Yuan against the dollar significantly reduced China's exports to the United States but had no significant effects on China's exports to Japan. These findings are robust to different measures, econometric methods, and period coverage. 相似文献
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The Impact of EMU on Trade Flows. — In this paper we quantify the impact of exchange rate volatility on trade flows within the EU with the help of a gravity trade model. We consider bilateral instead of total exports, and we use panel data. Moreover, we introduce dynamics into the model, taking lagged exports as explanatory variable. The estimation of this model for the period 1962–1995 leads to significant negative coefficients for the proxy of exchange rate variability. We use these estimates to calculate the potential trade-creating effect of a monetary union, setting the exchange rate volatility equal to zero. 相似文献
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This paper investigates the temporal stability of the relationship between the Deutschmark/US dollar exchange rate and macroeconomic
fundamentals. We use monthly data from 1975:01 to 2007:12. Applying a novel time-varying coefficient estimation approach,
we come up with some interesting properties of our empirical model. Firstly, there is no stable long-run equilibrium relationship
among fundamentals and exchange rates, since the breakdown of Bretton Woods. Secondly, there are no recurring regimes, i.e.
across different regimes, either the coefficient values for the same fundamentals differ or the significance differs. Thirdly,
there is no regime into which no fundamentals enter. Fourthly, the deviations resulting from the stepwise cointegrating relationship
act as a significant error-correction mechanism. In other words, we are able to show that fundamentals play an important role
in determining the exchange rate, but their impact differs significantly across different subperiods. 相似文献
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人民币升值与物价上涨的悖论分析 总被引:1,自引:0,他引:1
文章从人民币升值与物价上涨这两个相互矛盾的经济现象出发,采用2005年汇改以来的月度统计数据,对数据进行有效的实证建模计量分析,通过协整分析、误差修正和格兰杰因果关系分析的方法对我国的物价上涨与人民币升值等之间的关系进行实证分析后,得出由于我国的外汇机制和汇率的预期等原因而导致了我国人民币升值与物价上涨并存的结论,并提出了改善该现状的政策建议。 相似文献
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Exchange rate movement usually results in changes in the production costs of exporting firms, and, therefore, the prices and the quantity of traded products. The present paper constructs a theoretical model to demonstrate that export products with higher productivity, or with larger market share, or of higher quality will experience a less complete pass‐through. Using the six‐digit harmonized system export data from the CEPII database over the period of 2000 to 2013, the present paper examines how product heterogeneity affects the exchange rate pass‐through of Chinese exports. The empirical results show that the most competitive Chinese export products, or those least affected by exchange rate risks, are those of higher quality, with higher technological complexity and at the high end of the international value chain. Therefore, Chinese exporting firms should pay more attention to improving export quality and upgrading technology to better cope with exchange rate risks and to enjoy more bargaining power in the international market. 相似文献