摘要
常规相控阵雷达通过移相发射空间合成的相参信号形成能量聚集的天线方向图,由于收发天线复用因此所合成的天线孔径要低于收发分置的MIMO雷达。该文首先通过理论推导MIMO雷达在探测性能上和相控阵雷达的一致性及区别,指出MIMO雷达的实质优势在于发射波束的数字赋形。然后设计一种基于防撞雷达的分集相控阵,发射端采用相控体制,接收端采用DBF数字波束形成,通过分析移相器位数对该雷达性能的约束,证明在指定波束指向上该雷达在避免产生正交信号的前提下能达到和MIMO雷达相同的虚拟孔径性能。最后通过计算机仿真,验证该方法的有效性和可行性。采用该雷达体制在保证合成波束宽度的前提下,能有效降低接收通道数,从而有效降低雷达成本并提高通道一致性。
Conventional phased array radar transmits coherent signal to form antenna pattern. By transmitting and receiving antenna reuse its aperture is always less than MIMO radar. This paper firstly analyses the same points and the difference between MIMO radar and phased array radar. It further points out that the essential advantage of MIMO radar is the digital transmitting beam forming. Second it designs a diversity phased array radar in collision avoidance atmosphere. Its transmitting part uses phase array system, while the receiving part uses the Digital BeamForming （DBF）. Through the analysis for the limitation of the digits phase shifter, it proves that this radar can achieve the same virtual aperture performance as MIMO radar, while the rader can avoid to produce the orthogonal signal. Finally through the computer simulation it verifies the feasibility and effectiveness of the method. This radar system can effectively reduce the cost and improve channel consistency under the premise of promised beam width.
作者
唐尧
李波
杜自成
TANG Yao;LI Bo;DU Zicheng(School of Electronics and Information,Northwestern Polytechnical University,Xi＇an 710072,China;（Xi＇an Electronic Engineering Research Institute,Xi＇an 710100,China)
出处
《电子与信息学报》
EI
CSCD
北大核心
2018年第8期1795-1801,共7页
Journal of Electronics & Information Technology
关键词
分集相控阵
集中式MIMO雷达
波形设计
防撞雷达
Diversity phased array
Centralized MIMO radar
Waveform design
Collision avoidance radar
