CAJ | 학술논문

由于我国天文大地网存在较大的局部系统差和累积误差，采用Bursa模型完成坐标转换后往往还剩余较大的残差。为了提高转换精度，可以将转换区域向3分为小的格网单元，利用数学模型计算得到每个格网节．点的坐标转换改正量；再通过格网内插得到其中任意位置的坐标转换改正量，从而完成坐标转换。对同一区域分别用Bursa7参数法与格网内插法进行了坐标转换，格网内插法的转换精度明显高于Bursa法。
유우아국천문대지망존재교대적국부계통차화루적오차，채용Bursa모형완성좌표전환후왕왕환잉여교대적잔차。위료제고전환정도，가이장전환구역향3분위소적격망단원，이용수학모형계산득도매개격망절．점적좌표전환개정량；재통과격망내삽득도기중임의위치적좌표전환개정량，종이완성좌표전환。대동일구역분별용Bursa7삼수법여격망내삽법진행료좌표전환，격망내삽법적전환정도명현고우Bursa법。
In the astro-geodetic network of our country, large local systematic error and accumulative error exist, it is always the case that large residuals still remain after the transition to coordinate system adopting Bursa model. In order to improve transfor- mation accuracy, the transformation area is divided into small grid cells, then the coor- dinate transformation correction of each grid node is computed adopting mathematical model, finally, the coordinate correction of any place can be gotten by grid interpola- tion, and the coordinate transformation is achieved. In this paper, Bursa 7 parameters method and grid interpolation method were used for coordinate transformation on the same area, and the result is that the transformation precision of grid interpolation meth- od is significantly higher than Bursa 7 parameters method.