宽带LFM相控阵雷达、通信一体化射频前端设计

发布时间：2018-06-18 07:32

本文选题：宽带 + LFM　；参考：《东南大学》2016年硕士论文

【摘要】：随着雷达技术的发展,雷达的应用领域越来越广泛,对雷达的要求已经不仅仅局限于目标的探测,还要给出目标的属性和目标的细微特征。宽带相控阵雷达结合宽带雷达和相控阵雷达的优点,可以满足波束控制灵活、干扰抑制能力强以及分辨率高等众多要求。与此同时,雷达技术与无线通信技术的相似性使得雷达和通信系统的一体化成为可能。本课题研究的是宽带LFM相控阵雷达、通信一体化射频前端。根据本课题的应用背景和对常见收发链路方案的分析比较,本文选用了零中频结构,射频频率为2.2-2.7GHz,带宽500MHz。根据应用场景确定系统指标,选择合理的设计方案,并对收发前端进行链路仿真,确定各模块的指标分配并根据分配指标选择合适的器件。然后,本文对收发链路的各关键模块进行了硬件设计,包括正交调制模块、正交解调模块、低噪声放大器模块、功率放大器模块以及3dB定向耦合器等。最后,本文分别对发射链路和接收链路的整体性能进行了测试。发射链路的最大输出功率为17dBm左右,500MHz带宽内的增益平坦度为1.2dB；射频输出的相位受基带输入控制,且基带信号给固定权值时,射频输出信号的移相偏差在3°以内；当基带信号给动态权值时,波束扫描指向不会随频率变化而改变,且当波束扫描指向0°时,其副瓣电平为-14dB左右,波束扫描指向在±30°以内时,其副瓣电平维持在-10dB以下,和理论值基本一致；系统输入2OMsps的16QAM调制信号,发射链路在输出10dBm功率时的EVM为2.8763%。接收链路的测试结果为：基带I/Q输出信号的幅度不平衡度在0.3dB以内,相位不平衡在2.4°以内；接收机整体噪声系数为5dB左右；20Msps、16QAM调制信号下测得的接收链路的EVM为1.681%。以上测试结果表明,该一体化射频收发前端既能实现波束形成和波束扫描控制,又能满足基本的通信性能需求。
[Abstract]:With the development of radar technology, the application of radar is becoming more and more extensive. The requirements of radar are not only limited to target detection, but also the attributes of target and the fine characteristics of target. Wideband phased array radar combines the advantages of wideband radar and phased array radar, which can meet the requirements of flexible beam control, strong interference suppression ability and high resolution. At the same time, the similarity between radar technology and wireless communication technology makes the integration of radar and communication system possible. This topic is the broadband LFM phased array radar, communication integration RF front-end. According to the application background of this subject and the analysis and comparison of common transceiver link schemes, the zero-if structure is chosen in this paper, the RF frequency is 2.2-2.7 GHz and the bandwidth is 500MHz. According to the application scenario, the system index is determined, the reasonable design scheme is selected, and the link simulation of the transceiver front-end is carried out, the index allocation of each module is determined and the appropriate device is selected according to the allocation index. Then, the key modules of the transceiver link are designed, including quadrature modulation module, quadrature demodulation module, low noise amplifier module, power amplifier module and 3dB directional coupler. Finally, the overall performance of transmission link and receiving link are tested. The maximum output power of the transmission link is about 17dBm and the gain flatness in 500MHz bandwidth is 1.2 dB.The phase of the RF output is controlled by the baseband input, and the phase shift deviation of the RF output signal is less than 3 掳when the baseband signal is given a fixed weight. When the baseband signal gives dynamic weight, the beam scanning direction does not change with the change of frequency, and the sidelobe level is about -14dB when the beam scanning point is 0 掳, and the sidelobe level is below -10dB when the beam scan direction is less than 卤30 掳. The system inputs the 16QAM modulation signal of 2OMsps and the EVM of the transmission link is 2.8763 when the output power is 10dBm. The test results of the received link are as follows: the amplitude unbalance of the baseband I / Q output signal is less than 0.3 dB and the phase unbalance is within 2.4 掳, and the EVM of the received link measured under the receiver's overall noise coefficient is about 5 dB and 20 MspsN 16QAM modulation signal is 1.681. The test results show that the integrated RF transceiver can not only achieve beamforming and beam scanning control, but also meet the basic communication performance requirements.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN958.92

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