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• W488191 abstract "In this paper the comparison between the results (JD2443915.23—2443940.86) calculated by us and those of other analysis centers is listed in Table 1. Four questions are discussed as follows: 1. The influence of adopted initial values of UT1-UTC, x, y, has been discussed. If the initial value of UT1-UTC sets to zero or equals to that of the Circular D of BIH, the same values of UT1-UTC can be obtained by iterating 2 times. When the x, y, values used deviate from those of BIH to 0.02″ the influence of UT1-UTC may be 0.5 ms listed in Table 2. Because the accuracy of x, y supplied by BIH is better than 0.01″, it is reasonable to adopt x, y from Circular D of BIH for determination of UT1-UTC using the data Of LLR at single station. 2. The influence of adopted spherical station coordinates (λ,φ, τ) has been analysed and the results arc listed in Table 3. 3. The influence of the adopted constants of lunar physical liberation has been analysed. Two sets of the adopted value, MERIT Standards and the Eckhart-500 are used for UT1-UTC calculation. The results are listed in Table 5. 4. The choosing pre-residual or post-residual to determine UT1-UTC is also discussed. If the pre-residual is used for UTI-UTC calculation it means that the initial reference system is adopted, while the post-residual is corresponding to the corrected reference system (the initial parameters plus the corrected value obtained from adjusting a series of lunar observations). For comparing the results between different analysis center, the pre-residual should be adopted. The values of UT1-UTC calculated from the data of LLR in main MERIT Campaign with our method and JPL are listed in Table 7. CERGA (Grasse, France) and MLRS which is instead of 2.7 m telescope of McDonald began the regular observations of LLR since July 1982 and Sept. 1983 respectively. There are two stations to operate the LLR program in the world in the main MERIT Campaign and whose longitude difference is about 111°. It means that the possibility of solving the three parameters of ERP exists now. Due to the uncorrected station coordinates and the systematic error of observation, the systematic error should be reduced for ERP calculation. For determining the ERP, each observational equation should be given a suitable weight based on rms of the normal point (internal weight) and the square error (external error) obtained from adjusting the observations of LLR about one year. The purpose will enable that the difference between p_(in) and p_(ex) is not obvious. The results are listed in Table 8. Using the data of LLR at tw.o stations, Grasse and McDonald, in main MERIT Campaign the corrected station coordinates and the baseline length between two stations are also obtained and listed in Table 9, 10, The precision are 10—50 cm and 20—40 cm respectively. For determining the ERP, the regular observations of LLR will be expected at two stations or others which have already had the observing condition." @default.
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• W488191 date "1986-12-01" @default.
• W488191 modified "2023-09-25" @default.
• W488191 title "DETERMINATION OF ERP WITH THE DATA OF LLR" @default.
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