中文摘要：

针对七参数模型非迭代解法比较稳健，但精度较低；迭代解法精度较高，但收敛性易受初始值的影响，提出一种联合估计七参数的方法。该方法解决了传统方法不适用于大旋转角的难题，具有收敛速度快，求解精度高等特点，因不需要迭代初始值而能应用于任意角度转换的七参数空间直角坐标转换模型。并通过实测算例验证了该方法的正确性与有效性。

英文摘要：

Estimation of seven-parameter model by non-iterative method is relatively stable, but accuracy is lower; accuracy of estimation by iterative method is higher, but its iteration convergence is vulnerable to the initial value. A method estimating seven-parameter model by the combination of non-iterative with iterative method was proposed. The new method resolves the problem that the iterative methods is unsuitable for large rotation angle. Con- vergence in estimation by the new method is fast and accuracy is higher, and it can be applied to cartesian coordi- nate with arbitrary conversion because of not required initial values. The checking calculation for some cases proves the method is correct and effective.