CAJ | 학술논문

为了规避传统逆 Poisson 积分向下延拓解算过程的不适定性问题，借鉴导航定位中的“差分”概念，利用超高阶位模型直接计算海域航空重力测量向下延拓改正数的方法。本文在此基础上提出联合使用重力位模型和地形高数据，计算陆部航空重力向下延拓总改正数的改进方案，以飞行高度面与地面对应点的位模型差分信息表征总改正数的中长波分量，以相对应的局部地形改正差分修正量表征总改正数的中高频成分，从而实现航空重力数据点对点向地面的全频段延拓。在地形变化不同区域，联合使用EGM2008位模型、地面实测重力和高分辨率高程数据进行了实际数值计算和精度评估，验证了该方法的有效性。
위료규피전통역 Poisson 적분향하연탁해산과정적불괄정성문제，차감도항정위중적“차분”개념，이용초고계위모형직접계산해역항공중력측량향하연탁개정수적방법。본문재차기출상제출연합사용중력위모형화지형고수거，계산륙부항공중력향하연탁총개정수적개진방안，이비행고도면여지면대응점적위모형차분신식표정총개정수적중장파분량，이상대응적국부지형개정차분수정량표정총개정수적중고빈성분，종이실현항공중력수거점대점향지면적전빈단연탁。재지형변화불동구역，연합사용EGM2008위모형、지면실측중력화고분변솔고정수거진행료실제수치계산화정도평고，험증료해방법적유효성。
In order to evade the ill‐posedness of downward continuation for airborne gravity data using traditional inverse Poisson integral,in a recent published article,a practical downward continuation method of airborne gravity data was used for the sea surveying areas using the differential conception in navigation and location for reference,in which the continuation corrections are calculated using ultra‐high‐degree geopotential model.In this paper,we continue using the same idea and develop the method to the application for land surveying areas.It suggests that terrain Information can be used to improve the calculated accuracy of continuation correction from geopotential model.The differential of local topographic corrections on flying height and corresponding ground point is added to the continuation correction from geopotential model,and it makes up the total continuation correction.It is ultimately realized to continue airborne gravity measurements to the ground in full frequency extension.EGM2008 geopotential model,ground gravity data and digital elevation model in high resolution are used as a case study to prove the efficiency of the new method.