| Active radar seeker is one of the common conductor system for the anti-ship missile.The target detection performance of the active radar seeker is affected by various aspects,such as the sea clutter and the nonhomogeneous clutter.The reasons of the nonhomogeneous clutter can be divided into two categories: the distribution of clutter is inconsistent in the front and rear reference windows;the scattering points of range-extended targets and sea peaks become the isolated interference.In addition,the method of system simulation could verify the performance of the seeker.This thesis first studies a nonhomogeneous sample rejection algorithm based on Ordered Data Variability(ODV)to solve the problem of heterogeneity of the sea clutter caused by the isolated interference.The relationship between detection threshold and error probability was discussed.For the problem that calculating threshold of ODV statistics is very difficult,proposing a threshold acquisition algorithm based on mean square error.The threshold acquisition method has a good effect by simulating and analyzing,and the value range of the relevant parameters is discussed.Then,in order to solve the problem that the detection performance of the double-threshold detector is poor in the nonhomogeneous clutter,Combining the nonhomogeneous sample rejection algorithm with VI-CFAR,proposing an adaptive CFAR detector based on VI-ODV.Then using this detector for the first threshold detection of double-threshold detector,proposing a double-threshold detector based on VI-ODV-CFAR.The detector can detect extended targets in nonhomogeneous clutter by simulating.Finally,using VS2010 platform to modularly modeling the active radar seeker,giving the implementation process of the algorithm,and simulating the modules and systems in combination with specific scenarios.After analyzing the simulation results,the correctness and effectiveness of the algorithm and the rationality of the modularization of the system are verified.This thesis studies the extended target detection algorithm in a nonhomogeneous environment,and carries out a system simulation of the active radar seeker with specific projects,and implements the target detection algorithm in the system.After simulating,the algorithm has good performance and robustness.And the simulation results show the correctness of the system modular simulation. |
