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低峰均比OFDM雷达信号的收发系统设计

A Co-design of Tranceiver System and OFDM Radar Signal with Low Peak-to-average Power Ratio
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摘要 射频性能和计算量的平衡是正交频分复用(OFDM)雷达信号得以应用的前提。文中使用一种子载波频谱幅度滚降的OFDM雷达信号加权系数生成方法,通过调整滚降系数来控制过渡带中的子载波功率,保证低功率峰均比的前提下减少直接数字式频率合成(DDS)中有限长单位冲激响应(FIR)滤波器所需阶数。通过设计低计算复杂度的产生与接收方案,分析了饱和放大器幅度非线性以及模拟滤波器相位非线性对OFDM雷达信号带来的影响,使其在现有雷达硬件平台上可实现。仿真和测试验证了文中提出方法的有效性。 The balance between the radio frequency( RF) performance and the complexity is necessary for the orthogonal frequency division multiplexing( OFDM) radar signal. A method for getting the weight values of the OFDM signals with low peak-to-average power ratio( PAPR) is developed,which can decrease the finite impulse response( FIR) filter orders in the direct digital frequency synthesis( DDS) circuit by rolling off the OFDM spectrums. The powers of the subcarriers in the filter transition band can be reduced by tuning the roll-off parameter. The OFDM radar signal’s generating and receiving architectures are designed with low computation complexity for the application on the existing radar hardware. Some effects from the RF circuits are discussed including the nonlinearity of the amplitude produced by the power amplifiers and the nonlinearity of the phase produced by the analog filters. A simulated example is provided to illustrate the performance of the proposed method. An experiment demonstrates the achieved performance.
作者 赵晖 陆珺 陆健鲲 ZHAO Hui;LU Jun;LU Jiankun(AVIC Lei Hua Electronic Technology Research Institute,Wuxi 214063,China)
出处 《现代雷达》 CSCD 北大核心 2019年第1期73-79,共7页 Modern Radar
关键词 正交频分复用雷达信号 功率峰均比 相位调制 饱和放大 相位非线性 软件无线电 orthogonal frequency division multiplexing radar signal peak-to-average power ratio phase modulation saturation amplification nonlinearity of phase software defined radio
作者简介 通信作者:赵晖,男,1981年生,博士,高级工程师。研究方向为雷达接收机、频综器、T/R组件等。Email:jswx607@sina.com;陆珺,女,1984年生,硕士,高级工程师。研究方向为宽带数字信号产生、高速DAC和ADC应用;陆健鲲,男,1976年生,大学本科,研究员级高级工程师。研究方向为机载雷达整机、雷达射频系统等。
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