Non-linear equations are(constructed) with the restriction of the satellite ground trace to resolve the unknown semi-axis and inclination, but it's too complicated to be resolved directly.
Application of ground penetrating radar in projects indicates that its application in old cement concrete pavement retrofitting is feasible and it may overcome restriction by common inspection method.
工程应用表明，探地雷达应用到旧水泥混凝土路面改造中是可行的，可以克服常规检测方法的局限性。
3
It is therefore easy to conclude that the swelling soil ground is a semi-infinite space and it is feasible to adopt the lateral restriction test of in situ swelling soil.