Aiming at the orientation of different space domain targets in radar netting, the basic characteristics of three stations distance orientation and three baselines blending orientation are proposed, and the error precisions are analyzed in emphases.

The paper discussed the method of setting out transition curve route with directional radial intersection method,then three specific mathematics methods:approaching,iteration,bisection and precision analysis are given.

Passive DF and crossing location method is an important approach of the interference suppression technology for radar networks.

In order to get high precision of localization in WSN (wireless sensor network),an area summation of triangle localization algorithm based on RSSI ranging technique is brought up,taking account mainly of the measurement precision and improvement of the distribution of beacon nodes.

e curve intersection method and finite element method (FEM).

Based on the curve intersection method for the thickness calculation of composite geomembrane, the secant modulus iteration method and the finite element stress-strain curve method are put forward for determination of the thickness of composite geomembrane, and the basic principle and calculation procedure of the two methods are introduced.

The composite geomembrane is a reliable impermeable material and curve intersection method is the most simplest and convenient and the commonest method to calculate the thickness of the composite geomembrane.