代码：读取gps接收机广播星历代码

//基本广播星历块
struct EPHEMERISBLOCK
//每小时一个卫星对应一个基本星历块
{
//PRN号 
int i1PRN;
double f8a0,f8a1,f8a2;//时间改正数
//六个轨道参数
double f8IODE,f8Crs,f8Deltan,f8M0;// ORBIT - 1
double f8Cuc,f8e,f8Cus,f8SqrtA;// ORBIT - 2
double f8Toe,f8Cic,f8OMEGA,f8Cis;// ORBIT - 3
double f8i0,f8Crc,f8omega,f8OMEGAdot;// ORBIT - 4
double f8IDOT,f8GpsWeekNumber,f8L2C,f8L2P;// ORBIT - 5
double f8SatAccuracy,f8SatHealth,f8TGD,f8IODC;// ORBIT - 6
};



//读广播星历文件
//
int ReadBrodcastEphemeris(CString strEpheNam)
{
int i4HeadLineNum = 0;
//打开文件
CStdioFile pfEph;
BOOL IsEn = pfEph.Open(strEpheNam, CFile::modeRead);
if(!IsEn) return 0;
//读入头文件
CString strLine;

while(IsEn)
{
IsEn = pfEph.ReadString(strLine);
i4HeadLineNum++;
int index = strLine.Find("END OF HEADER");
if( -1 != index )
break;
}
//计算星历块数
int AllNum = 0;
while(IsEn)
{
IsEn = pfEph.ReadString(strLine);
AllNum++;
}
//临时读入星历块
int i4AllBlockNum = (AllNum + 1) / 8;
EPHEMERISBLOCK *pTemEpheme = new EPHEMERISBLOCK[i4AllBlockNum];
CGpsTime  *pGpsTime = new CGpsTime[i4AllBlockNum];

if(!pTemEpheme || !pGpsTime) return 0;
//将文件指针调整到数据位置
pfEph.SeekToBegin();
for(int i=0; i<i4HeadLineNum; i++)
IsEn = pfEph.ReadString(strLine);
    //定义读取的参数
int mPrn;//卫星号PRNo 
int year,month,day,hour,minute;//卫星钟参考时刻
double   msecond; 
double   a0,a1,a2;//卫星钟飘参数