| 摘要: |
| 根据星载雷达高度计回波模拟器工作在Ku波段、带宽在20 MHz/80 MHz/320 MHz中自适应切换技术要求，提出了一种雷达高度计回波模拟器射频信号带宽自动检测与识别方法，使用带宽为20 MHz、80 MHz、320 MHz线性调频信号作为本振信号进行混频，结合改进后的多相抽取滤波结构得到三路解调数据，再进行带宽类型的识别。经Matlab实验仿真与现场可编程门阵列(Field Programmable Gate Array,FPGA)工程验证可知，该方法能够准确识别当前高度计信号带宽类型和捕获对应的数字基带信号，时间复杂度低，实时性强。 |
| 关键词: 雷达高度计 回波模拟器 带宽检测与识别 并行DDS 多相抽取滤波 |
| DOI：10.20079/j.issn.1001-893x.230413002 |
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| 基金项目: |
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| An Automatic Detection and Identification Method of RF Bandwidth in Radar Altimeter Echo Simulator |
| LIU Guangkang,LIU Peng,XU Ke |
| (1.National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;2.University of Chinese Academy of Sciences,Beijing 100049,China;3.Key Laboratory of Microwave Remote Sensing,Chinese Academy of Sciences,Beijing 100190,China) |
| Abstract: |
| According to the technical requirements of the satellite-based radar altimeter echo simulator operating in Ku-band and the adaptive switching of the operating bandwidth in 20 MHz/80 MHz/320 MHz,an automatic detection and identification method is proposed for the RF signal bandwidth of the radar altimeter echo simulator.The linear frequency modulated signals with bandwidths of 20 MHz,80 MHz and 320 MHz are used as the local oscillator signals for mixing,and combined with an improved multi-phase extraction filter structure,three-channel demodulated data is obtained for the final identification of bandwidth types.The Matlab experimental simulation and the field programmable gate array(FPGA) engineering verification show that this method can accurately identify the current altimeter signal bandwidth type and capture the corresponding digital baseband signal with low time complexity and high real-time performance. |
| Key words: radar altimeter echo simulator bandwidth detection and identification parallel DDS polyphase filtering |
