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1·The broadcast ephemeris, which is the basic of satellite navigation, must be precise and real time.

卫星导航定位的基础，要求有较高的精度和实时性。

2·This paper discusses the essential method of using GPS pseudorange data to assess the precision of broadcast ephemeris.

论述了GPS监测站伪距观测量评定广播星历精度的基本方法。

3·Devices and methods are described for determining position information without broadcast ephemeris data for extended time periods.

描述了用于对延长的时间段确定位置信息而无需广播星历数据的设备和方法。

4·The Chebyshev polynomial was applied to fit satellite coordinates of the broadcast ephemeris to realize satellite orbit standardization.

利用切比雪夫多项式拟合广播星历的卫星坐标，以实现卫星轨道的标准化。

5·In this paper, a new method for calculating the coordinate and velocity of the satellite by means of the broadcast ephemeris has been presented.

本文介绍了利用广播星历表计算卫星的坐标和速度的一种方法。

6·In this paper, we describe two methods for computing the coordinates and velocities of satellites by using the broadcast ephemeris of the transit satellites.

本文介绍利用子午卫星的广播星历表计算卫星坐标和速度的两种方法。

7·Designs of the broadcast ephemeris parameters and algorithms of GPS and GLONASS, two major operational satellite navigation systems today have their respective features.

GPS和GLONASS作为当今世界上在轨运行的两大卫星导航系统，其广播星历参数的设计和算法各具特点。

8·It also shows that the variety laws of the fitting result of broadcast ephemeris for MEO and IGSO satellites are similar to each other and are different to GEO satellites.

MEO和IGSO卫星在一个轨道周期内星历参数拟合结果的变化规律相近，但是与GEO卫星的差异较大。

9·When their orbit eccentricity or inclination are near zero, some problems may occur when the GPS Kepler orbit elements fitting method is applied to fit their broadcast ephemeris parameters.

导航卫星一般采用近圆轨道，当卫星轨道偏心率或者轨道倾角接近于零时，利用GPS卫星开普勒轨道根数拟合卫星广播星历会出现一些问题。