LCRⅡ型和Ⅰ型航空重力仪的同机飞行试验

CONCURRENT FLIGHT TEST OF LaCoste & Romberg(LCR) AIRBORNE GRAVIMETER Ⅱ AND Ⅰ SYSTEM

为检验和评价LCRⅡ型航空重力仪的精度和性能,与LCRⅠ型航空重力仪进行了同机飞行试验。试验结果表明,Ⅱ型与Ⅰ型航空重力仪相比,采样点重力异常之差值的标准差为4.0×10-5ms-2,单套重力仪的测量精度约为2.8×10-5ms-2;5'×5'格网平均重力异常之差的标准差为4.9×10-5ms-2,每套系统获得的5'×5'格网平均重力异常的精度为3.5×10-5ms-2,剔除两个可疑值后,精度为2.9×10-5ms-2。总体上,LCRⅡ型航空重力仪与Ⅰ型精度相当,但具有更快的仪器稳定速度。

In order to validate the accuracy and the performance of the LaCoste ＆ Romberg （ LCR Ⅱ ）, a con- current flight test over a mountain area was undertaken. The LCR gravimeterⅡ and an LCR gravimeter I system side by side. The results of the flight test show that the standard deviation of the gravity anomalies difference meas- ured with the two systems is about 4.0 ×10^-5ms^-2 namely the accuracy of the single system is about 2.8 ×10^-5ms^-2 if we assumed the two systems have the same accuracy. They also indicate that the standard deviation of the 5′×5′ grid mean gravity anomalies difference from the two systems is about 4.9 ×10^-5ms^-2 namely the related accu- racy of the single system is about 3.5×10^-5ms^-2 and 2.9 ×10^-5ms^-2 after two outliers were eliminated. In gener- al, LCR gravimeterⅡ system has the identical accuracy as the LCR gravimeter I system, but it can be quickly leveling off.