【摘要】：基于中國地殼運(yùn)動觀測網(wǎng)絡(luò)2000年流動重力觀測數(shù)據(jù),分析18臺LCR-G型相對重力儀的零漂特性。結(jié)果顯示,重力儀零漂率在某些時段變化較大,最大達(dá)10μGal/h以上。根據(jù)重力儀零漂改正的不同處理方法,利用傳統(tǒng)平差模型與改進(jìn)模型對觀測數(shù)據(jù)進(jìn)行平差計算,并對結(jié)果進(jìn)行比較。在相同先驗中誤差的情況下,傳統(tǒng)平差模型的后驗中誤差為39μGal,重力值平均精度為26.5μGal,而改進(jìn)模型的后驗中誤差為16.5μGal,重力值平均精度為11.2μGal,遠(yuǎn)高于傳統(tǒng)平差模型。在數(shù)據(jù)預(yù)處理階段按閉合觀測分段進(jìn)行零漂改正,可以有效消除重力儀零漂劇烈變化的影響,明顯優(yōu)于將儀器零漂率當(dāng)作固定參數(shù)的計算方法。
[Abstract]:Based on the mobile gravity observation data of China crustal Movement observation Network in 2000, the zero drift characteristics of 18 LCR-G relative gravimeters are analyzed. The results show that the zero drift rate of gravimeter varies greatly in some periods, and the maximum value is more than 10 渭 Gal/h. According to the different processing methods of zero drift correction of gravimeter, the traditional adjustment model and the improved model are used to calculate the adjustment of the observed data, and the results are compared. In the case of the same prior median error, the posterior mean error of 39 渭 Gal, gravity value is 26.5 渭 Gal, for the traditional adjustment model and 16.5 渭 Gal, for the improved model. It is much higher than the traditional adjustment model for the average accuracy of 16.5 渭 Gal, gravity value. In the stage of data preprocessing, zero drift correction according to closed observation section can effectively eliminate the influence of the sharp variation of zero drift of gravimeter, and it is obviously superior to the calculation method which regards the zero drift rate of the instrument as a fixed parameter.
【作者單位】： 中國科學(xué)院大學(xué);中國地震局第二監(jiān)測中心;中國科學(xué)院測量與地球物理研究所大地測量與地球動力學(xué)國家重點實驗室;中國地震局地震研究所(地震大地測量重點實驗室);地殼運(yùn)動監(jiān)測工程研究中心;
【基金】：國家973計劃(2014CB845902) 國家自然科學(xué)基金(41274085,41304059)~~
【分類號】：P223
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本文編號：2289060