A Study on Unit-level Digital Array Radar Noise Lobe-sweeping Mechanisms and Suppression
When the receiving lobe is tested in a multi-function unit-level digital array system,it is found that there is a noise drum packet about 10dB near the normal.The phenomenon of noise sweeping lies that the noise drum packet disappears when the beam points from one degree to two degrees away from the normal direction.In this paper,based on the basic model of cascaded noise figure of receiver,the noise figure formula of multi-channel input receiving system is derived,and the source of additional noise in-jection inside the receiver and its effect on the system are analyzed and mathematically modeled,the concept of optimization factor of additional noise scanning angle is defined,and the phenomenon of noise sweep is explained reasonably.Furthermore,according to the mathematical model,a variety of solutions are proposed,and the advantages and disadvantages of various schemes under the existing conditions are analyzed,and finally the measures to reduce the injection noise power are selected.The practice shows that the solution based on this measure is effective.The mechanism analysis,mathematical model and solution in this article can guide the follow-up products and have high reference value for practical engineering applications.
万方数据
维普
