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到目前为止,国内、外各种求重力二次导数公式已不下数十种了.由于它们的种类繁多、性质差异很大,不便于选择与利用,所以有很多人对公式的误差与性质进行了研究.但也有些作者只提出了公式,并未对所提公式进行讨论,这就可能在使用时造成错误.因此,本文针对较常见的十六个公式进行了评价.从它们的一般式出发,讨论各公式的误差(近似性及传递误差特性),进而找出正确选择与应用公式的方法来.为评述方便,特将各公式编号,列举如下:
So far, no fewer than a dozen domestic and foreign formulas have been adopted for calculating the second derivative of gravity, and because of their wide variety and large differences in properties, they are not easy to choose and utilize, so many people make mistakes and properties of formulas However, some authors only put forward the formula, did not discuss the formula, which may cause errors when used.Therefore, this article for the more common sixteen formulas were evaluated from their general formula Set out to discuss the error of each formula (approximation and transfer error characteristics), and then find the correct choice and application of the formula to facilitate the review, especially the formula numbers, as follows: