两等级网不使用导数的联合非线性最小二乘估计

Combined nonlinear least squares adjustment for a two rank net without the derivatives of different observation values

针对不同等级测量控制网的联合平差,介绍一种不使用导数的解析方法,该方法一方面克服了传统平差中由于起算数据误差对低级网的精度影响,而使加密的精度逐次降低的缺点;另一方面,完全避免了导数的计算,大大减少了计算工作量。

In this paper, the analytical method for a combined adjustment of different rank survey control network is described. Not only can the method overcome an effect on inferior rank net due to initial data errors, but also completely avoid the calculation of derivatives and considerably reduce the calculated time.