无先验基准方法在SLR资料处理中的应用

Application of No Fiducial Approach in SLR Data Processing

ＳＬＲ（Ｓａｔｅｌｌｉｔｅ Ｌａｓｅｒ Ｒａｎｇｉｎｇ）资料处理一般来说总是由各 ＳＬＲ测站构成的坐标框架里进行．为了克服在ＳＬＲ资料处理过程中对坐标框架的重复定义，利用全球１９９９年１月到１２月的ＬＡＧＥＯＳ－１的ＳＬＲ资料以无先验基准方法解算ＥＯＰ（ＥａｒｔｈＯｒｉｅｎｔａｔｉｏｎ Ｐａｒａｍｅｔｅｒｓ）和所有ＳＬＲ站的坐标的试验．在ＳＬＲ资料处理中用无先验基准方法与 ＧＰＳ（Ｇｌｏｂａｌ Ｐｏｓｉｔｉｏｎｉｎｇ Ｓｙｓｔｅｍ）的不太一样，由于ＳＬＲ的资料不能把ＳＬＲ观测站连结成非常牢固的空问多面体（ＧＰＳ的资料在每一瞬间可以把测站联成一完整的空间多面体），因此需要加一些约束，以避免法方程出现秩亏．解得的测站坐标用７参数转换到ＩＴＲＦ９７坐标系；ｒｍｓ为 １．３ｃｍ．ＥＯＰ与ＩＥＲＳ的 ｅｏｐｃ０４序列相比，Ｘｐ、Ｙｐ的ｒｍｓ分别为 ０．３７ ｍａｓ、０．３０ ｍａｓ，ＬＯＤ（Ｌｅｎｇｔｈ Ｏｆ Ｄａｙ）的 ｒｍｓ为 ０．０１９ ｍｓ．

In analysis of SLR(Satellite Laser Ranging) data, a terrestrial reference frame is required. This is a test with no fiducial approach to obtain the estimates of polar motion and site coordinates based on SLR data from Jan. to Dec. of 1999. No fiducial approach in SLR is not same as in GPS(Global Positioning System). The some constraints is added to no fiducial approach of SLR in the test. The results are transformed into ITRF97 with the seven-parameter. The transformed coordinates are quite consistent with those of ITRF97 and the rms is 1.3cm. The polar motion is also consistent with that of the EOP(Earth Orientation Parameters) (IERS) and the rrns of xp, yp and LOD are 0.37 mas, 0.30 mas and 0.019 ms respectively. The test is successful.