利用卫星测高数据推求中国近海及邻域大地水准面起伏和重力异常研究

GEOID UNDULATIONS AND GRAVITY ANOMALIES FROM T/P AND ERS-1 ALTIMETER DATA IN THE CHINA SEA AND VICINITY

首先对中国近海及邻域（0°-40°N，105°─135°E）内4年的T／P卫星测高数据（1992－10-03-1996－10－09）和1年多的ERS－1卫星测高数据（1992－10－23-1994－01－20）进行了预处理以剔除数据中的粗差影响．然后，对卫星的重复轨迹采用"共线"处理方法得到该海域的平均海平面．在扣除海面地形的影响后得到该海域30'×X30'大地水准面起伏。再分别采用Stokes公式逆运算加FFT技术和最小二乘配置法恢复出该海域30'×30'海洋重力异常．所得到的海洋大地水准面起伏精度为8．5cm，恢复出的重力异常的精度为35×10－5m／s2．

Firstly four-year altimeter data from Topex/Poseidon satellite and one-year altimeter data from ERS-1 satellite in the China sea and its vicinity (0°-40°N,105°- 135°E) are pre-processed to eliminate the gross error in the altimeter data. Then they are used to determine the mean sea surface with the stacking method along the satellite repeated collinear tracks. After the contributions of sea surface topography are reduced from the mean sea surface, the 30' × 30' geoid undulations are obtained. Afterwords the 30' × 30' gravity anomalies are recovered by using the inverse Stokes formula with fast Fourier transform technique and the least squares collocation respectively. The precision of the geoid undulations and the gravity anomolies in the research area are 8.5cm(RMS) and 3.5 × 10-5m / s2 (RMS) respectively.