GPS标准历书Yuma，Rinex，TLE，SEM是什么意思？

它们都是GPS的标准历书。可以导入GNSS仿真软件例如，Spirent的 SimGen软件内导入。

是星历还是历书？ —我现在还不知道，欢迎留言告诉我。

信息比较简单，包含1-32颗卫星SV的资料，所以是历书。
使得接收机搜寻卫星有的放矢，而不是漫天搜星。
二来找到任意星的概略多普勒频移，辅助频域搜索。

下载打开一个就知道是什么了，
******** Week 49 almanac for PRN-01 ********
ID: 01
Health: 000
Eccentricity: 轨道偏心率 0.9519100189E-002
Time of Applicability(s): 历书基准时间147456.0000
Orbital Inclination(rad): 轨道倾角0.9790716268
Rate of Right Ascen(r/s): 升交点赤经变化率-0.7794610391E-008
SQRT(A) (m 1/2): 5153.588379
Right Ascen at Week(rad): -0.1956019874E+001
Argument of Perigee(rad): 0.756044677
Mean Anom(rad): -0.2437549026E+001
Af0(s): -0.3280639648E-003
Af1(s/s): -0.1091393642E-010
week: 49

******** Week 49 almanac for PRN-02 ********
ID: 02
Health: 000
Eccentricity: 0.1980066299E-001
Time of Applicability(s): 147456.0000
Orbital Inclination(rad): 0.9581291938
Rate of Right Ascen(r/s): -0.7977475151E-008
SQRT(A) (m 1/2): 5153.606934
Right Ascen at Week(rad): -0.2030848250E+001
Argument of Perigee(rad): -1.646827620
Mean Anom(rad): -0.2178932824E+001
Af0(s): -0.4234313965E-003
Af1(s/s): -0.7275957614E-011
week: 49

******** Week 49 almanac for PRN-03 ********
ID: 03
Health: 000
Eccentricity: 0.2655506134E-002
Time of Applicability(s): 147456.0000
Orbital Inclination(rad): 0.9650560758
Rate of Right Ascen(r/s): -0.7783181344E-008
SQRT(A) (m 1/2): 5153.544922
Right Ascen at Week(rad): -0.9146618858E+000
Argument of Perigee(rad): 0.705710183
Mean Anom(rad): 0.2755420855E+001
Af0(s): -0.1192092896E-003
Af1(s/s): -0.1091393642E-010
week: 49

Yuma在美国的网站可以下载：http://celestrak.com/GPS/almanac/Yuma/