Study On Technology Of Radar Low-angle Measurement

Low-angle measurement in the presence of multipath is an topic.But the modle for war is developing,and low-altitude flight become an important activity in the war now.So the technology of low-angle measurement become more important than before.For the presece of multipath,serious error may occour during the measurement. All work of this thesis surround this theme that how to improve the accuracy of low-angle measurement.An investigation on the theories of multipath-effect is made,the conclution will be useful to the model set-up and explanation of the simulation results.Then,a summry is made about currunt technology of low-angle measurement.The strongpoints and weakpoints of the technologies ammentionde are analized.An investigation on the C~2 Algrithmn which is applied in the low-angle measurement by the monopulse radar is made.The effect of measurement is discussed,and the factors related to the measure-error is analyzed. Acorrding to the signal model,expressions of the estimators of the C~2 Algrithmn are deduced, and a thorough analysis is made with the estimators.The compose of the error is analyzed too.A mothod of rivised C~2 Algrithmn is concluded by the selection of estimators. When the interference become seviere,this method can minish the error of measurement.And this method also can be applied in the real-time measurementAn investigation of the technology of low-angle measurement by the continuous-wave radar is made.A revises is made to the method of phase-comparision.And the result of simulation show that great promotion is obtained.The method of amplitude-comparision is usually used in the measurement by the monopulse radar.In this thesis,a discussion of how to use it in the measurement by the continuous-wave radar is made.The conclusion is that the method of amplitude-comparision can be used in the measurement by the continuous-wave radar,and this conclusion is benefit to the following investigation of the technology of low-angle measurement by the continuous-wave radar.The utility of the C~2 Algrithmn in the measurement by the continuous-wave radar is also studied.The theory of this algrithmn is also studed.At last, the simulation results are presented and a suggestion on how to apply the C~2 Algrithmn is presented.