某分布式雷达定时控制与通道校正的逻辑设计
发布时间：2018-12-15 19:50
【摘要】：近年来,越来越多的国家陆续装备了隐身武器,故加强隐身和反隐身技术研究势在必行。经研究表明,米波段雷达具有良好的反隐身效果,但米波段雷达具有带宽窄、波束宽、角度分辨率低、定位精度低等缺点,这使得其精度难以达到制导雷达的要求,增加天线孔径可以提高雷达的测角精度,但如果单纯通过增大天线孔径来获取高测角精度和定位准确性又会减弱雷达的机动性,这不符合现代雷达对探测精度和机动性的双重要求;分布式雷达在这种情况下应运而生,分布式雷达具有若干小孔径分布式子阵,每个子阵可根据需要放置在不同的地方,且每个子阵既可以单独探测目标,也可以通过相参合成以达到大孔径雷达的探测效果,如此便兼顾了探测精度和机动性两方面的需求。本文主要研究某分布式雷达试验系统的定时控制与通道校正逻辑的设计与实现。首先介绍分布式雷达的研究背景和研究现状;然后简单介绍了分布式相参合成雷达的基本概念以及定时控制转接板的硬件结构,本系统的定时控制转接板以FPGA作为主控芯片,利用光纤和网口分别与DAM、信号处理板、数据采集器以及上位机通信,以此将系统各模块相互连通起来;接着详细介绍各工作模式下定时控制逻辑与时序的设计,并给出调试及仿真结果。本试验系统共包含七种工作模式,分别为模目模式、接收校正模式、发射校正模式、等T搜索模式、变T搜索模式、步进频模式、相位编码模式,实现了不同工作模式逻辑控制的灵活切换;最后详细介绍数字阵列天线收发通道的相位误差校正,数字阵列雷达各收发通道通常存在相位不一致性,此不一致性对雷达的各项性能指标造成严重影响。本文采用一组校正网络将两个分布式子阵连起来做联合校正,以消除通道的相位不一致性。实际调试结果表明,本文设计的定时控制逻辑设计简单、有效,可以很好的实现分布式雷达的定时控制,并且本文所介绍的收发通道相位校正方法也可以有效的克服收发通道的相位不一致性问题,对于分布式雷达的设计研究具有重要的借鉴意义。
[Abstract]:In recent years, more and more countries have equipped stealth weapons, so it is imperative to strengthen the research of stealth and anti-stealth technology. The research shows that the meter band radar has good anti-stealth effect, but the meter wave band radar has the disadvantages of narrow band width, wide beam width, low angle resolution and low positioning accuracy, which makes its precision difficult to meet the requirements of the guidance radar. Increasing the aperture of the antenna can improve the precision of the radar angle measurement, but if we simply increase the aperture of the antenna to obtain the high precision of angle measurement and the accuracy of positioning, it will weaken the maneuverability of the radar. This does not meet the dual requirements of detection accuracy and maneuverability of modern radar. Distributed radar emerges as the times require. Distributed radar has several small aperture distributed subarrays, each of which can be placed in different places according to the need, and each sub-array can detect targets separately. It is also possible to achieve the detection effect of large aperture radar through coherent synthesis, which takes into account the requirements of both detection accuracy and maneuverability. This paper focuses on the design and implementation of timing control and channel correction logic for a distributed radar test system. Firstly, the research background and present situation of distributed radar are introduced. Then the basic concept of distributed coherent synthetic radar and the hardware structure of timing control switch board are introduced. The timing control board of this system takes FPGA as the main control chip, and uses optical fiber and network port and DAM, signal processing board, respectively. The data acquisition device and the upper computer communicate with each other in order to connect each module of the system; Then, the design of timing control logic and timing in each mode is introduced in detail, and the debugging and simulation results are given. The system consists of seven working modes, namely, the mode of eye, the mode of receiving correction, the mode of emissive correction, the mode of T search, the mode of variable T search, the mode of step frequency and the mode of phase coding. The flexible switching of logic control in different working modes is realized. At last, the phase error correction of digital array antenna transceiver channel is introduced in detail. The phase inconsistency is usually existed in each channel of digital array radar, which has a serious impact on radar performance. In this paper, a set of correction networks is used to combine the two distributed subarrays for joint correction to eliminate the phase inconsistency of the channel. The actual debugging results show that the logic design of timing control designed in this paper is simple and effective, and the timing control of distributed radar can be realized well. The phase correction method of the transceiver channel introduced in this paper can also effectively overcome the phase inconsistency of the transceiver channel, which has important reference significance for the design and research of distributed radar.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN958;TN791
[Abstract]:In recent years, more and more countries have equipped stealth weapons, so it is imperative to strengthen the research of stealth and anti-stealth technology. The research shows that the meter band radar has good anti-stealth effect, but the meter wave band radar has the disadvantages of narrow band width, wide beam width, low angle resolution and low positioning accuracy, which makes its precision difficult to meet the requirements of the guidance radar. Increasing the aperture of the antenna can improve the precision of the radar angle measurement, but if we simply increase the aperture of the antenna to obtain the high precision of angle measurement and the accuracy of positioning, it will weaken the maneuverability of the radar. This does not meet the dual requirements of detection accuracy and maneuverability of modern radar. Distributed radar emerges as the times require. Distributed radar has several small aperture distributed subarrays, each of which can be placed in different places according to the need, and each sub-array can detect targets separately. It is also possible to achieve the detection effect of large aperture radar through coherent synthesis, which takes into account the requirements of both detection accuracy and maneuverability. This paper focuses on the design and implementation of timing control and channel correction logic for a distributed radar test system. Firstly, the research background and present situation of distributed radar are introduced. Then the basic concept of distributed coherent synthetic radar and the hardware structure of timing control switch board are introduced. The timing control board of this system takes FPGA as the main control chip, and uses optical fiber and network port and DAM, signal processing board, respectively. The data acquisition device and the upper computer communicate with each other in order to connect each module of the system; Then, the design of timing control logic and timing in each mode is introduced in detail, and the debugging and simulation results are given. The system consists of seven working modes, namely, the mode of eye, the mode of receiving correction, the mode of emissive correction, the mode of T search, the mode of variable T search, the mode of step frequency and the mode of phase coding. The flexible switching of logic control in different working modes is realized. At last, the phase error correction of digital array antenna transceiver channel is introduced in detail. The phase inconsistency is usually existed in each channel of digital array radar, which has a serious impact on radar performance. In this paper, a set of correction networks is used to combine the two distributed subarrays for joint correction to eliminate the phase inconsistency of the channel. The actual debugging results show that the logic design of timing control designed in this paper is simple and effective, and the timing control of distributed radar can be realized well. The phase correction method of the transceiver channel introduced in this paper can also effectively overcome the phase inconsistency of the transceiver channel, which has important reference significance for the design and research of distributed radar.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN958;TN791
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