雪

GPS ; broadcast ephemeris ; satellite coordinate ; Chebyshev polynomial

GPS ；广播星历；卫星坐标；切比雪夫多项式

Based on the examples analyzed,this paper mainly discusses the impacts of the polynomial degree,fit time span and interval of the fitting points when using chebyshev polynomial to fit the satellite orbit,the situation using more orbital elements and the area and choosing of the orbital elements are also discussed at last.

以实例分析为基础，主要讨论了利用切比雪夫多项式拟合GPS卫星轨道时多项式阶数、时段长度、拟合点间隔等因素的设置问题；并对使用多组轨道参数进行轨道拟合的情况进行了分析；最后讨论了轨道参数的使用范围和选择问题；得出了有用的结论。

Introducing the user algorithm of the broadcast ephemeris, the algorithms are explained on principle, which are Lagrange Interplation and Chebyshev polynomial simulation. Then comparisons of calculating of satellite coordinate with broadcast ephemeris and with precise ephemeris are made.

推导了广播星历用户算法，对GPS数据处理中常用的拉格朗日内插和切比雪夫多项式拟合从原理上进行了阐述，并对广播星历卫星坐标计算和精密星历卫星坐标计算进行了分析比较。

When to get the coefficients of polynomial directly,the ill-conditioned matrix may be produced and effect the precision of result.Using orthogonal polynomial can avoid this problem.This paper introduces 4 orthogonal polynomial.In our discussion,it is proposed to use Chebyshev polynomial and Legendre polynomial,they are easier to sa...

讨论4种常用正交多项式在拟合卫星轨道与时间函数时的适用性；通过计算实例说明利用切比雪夫多项式和勒让德多项式做数据拟合时具有很高的精度；分析得出评定多项式拟合数据精度的适用阶数，实际应用中可降低工作量，提高计算效率；最后讨论同一多项式阶数下不同历元数对拟合结果的影响。

This company is the chenille products professional manufacturers, the company has a wealth of production experience, a strict management system, at the same time have a solid production technical force, advanced production equipment.

本公司系雪尼尔系列产品专业的生产厂家，公司具有丰富的生产经验、严格的管理制度，同时拥有雄厚的生产技术力量、先进的生产设备。

The company has its own design and manufacture of computer fancy spinning machine, spinning machine chenille.

公司拥有自行设计、制造的电脑花式纺纱机、雪尼尔纺纱机。

She folded the white table-cloth, and put on the chenille cloth.

她叠起白色的桌布，放在雪尼尔布上。

Possess a number of highly qualified management personnel, be able to more comprehensive design, development, production is currently the world's popular types of chenille yarn, fancy yarn.

拥有一批高素质的管理人才，能够较全面地设计、开发、生产目前世界流行的各类雪尼尔纱、花式纱线。

We're doing much more laser cutting, and extreme fine detail work but also lots with heavy fabrics such as chenille.

我们会更多地使用激光切割，并且做工会极度精细，同时我们也会大量使用雪尼尔纱等比较重的纺织品。

The main development, production chenille yarn, fancy yarn and other products to technology-based, customer demand and market trend of development-oriented, providing customers with "reliable, innovative, and advanced" products.

主要开发，生产雪尼尔纱、花式纱线等产品，以科技为基础，客户需求和市场发展趋势为导向，为客户提供"可靠、新颖、先进"的产品。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。