利用多代卫星测高数据计算中国近海及邻域重力异常

Calculation of gravity anomalies over China Sea and its vicinity based on multi-generation satellite altimetry data

为提高海洋重力场数据的精度和空间分辨率,联合Jason-1/2、T/P、Envisat、ERS-1/2、Geosat等多代卫星测高数据计算中国近海及邻域（0°～42°N,100°～140°E）2′×2′重力异常。对卫星测高数据分别进行共线处理和自交叉点平差,并以T/P卫星测高数据为基准进行多星数据联合平差,有效削弱了卫星测高数据的时变影响和不协调性;利用逆Vening-Meinesz公式计算重力异常,与船测重力相比,均方根误差为5.4 mgal。结果表明,通过引入高精度的卫星测高数据,结合多项平差处理手段,提高了海洋重力异常的计算精度。

To improve the accuracy and spatial resolution of marine gravity field data, we jointly used satellite altimetry data from Geosat, ERS-1/2, ENVISAT, T/P, Jason-1, and Jason-2 to calculate 2 ft × 2 ft gravity anomalies over China＇s offshore and adjacent areas（0°？42°N, 100°？140°E）. After performing collinear processing and self-crossover adjustments to these satellite altimetry data, we took the T/P data as the reference data for the multi-satellite data combined adjustment to weaken the time-varying influence and coordination. Then, we calculated gravity anomalies using the inverse Vening Meinesz formula. Compared with shipborne gravity data, the accuracy was 5.4 mgal. The results showed that the determination of marine gravity anomalies could be improved using multi-satellite altimetry data and making corresponding adjustments.