基于IFFT的毫米波步进频率高分辨率雷达回波信号处理
毕业论文关键词：步进频率 脉冲压缩 采集卡 IFFT 变换 信号处理 触发卡
Title IFFT-based millimeter-wave stepped frequencyHigh resolution radar echo signal processing
Abstract According to the theoretical analysis,high range resolution can berealized by expanding the spectrum width of radar signal.Step pulsefrequency system utilizes multiple wide pulses to synthesize a narrowone.During the entire frequency modulation period,radar emits a series offrequency modulated wide pulse by increase progressively the pulse leapof the pulse. The effect of synthesis of a series pulses is the same asof a narrow pulse in the frequency domain. This is equal to achieve afrequency spectrum of an echo of high intensity and narrow pulse. Now thatthe spectrum is close to spectrum of a simple narrow pulse during stepping,some kind of pulse compression process of this extend can result in highrange resolution profile of the target.This paper mainly uses AC6684 high speed sampling card to sample theI/Q tube echo of radar, and store the sample data in the RAM of the card.The upper computer reads the sample data in sequence by running MFC program,and then transfers it into corresponding voltage value and implements IFFTto it. At the end, the one-dimensional high range resolution profile ofthe target achieved.This paper introduced the theory and the signal processing method ofmillimeter wave stepped frequency high resolution radar; and the designof trigger card circuit and usage of AC6684 and the programming stream of MFC in VC++. Let’s have a deeper view of the signal processing method ofmillimeter wave stepped frequency high resolution radar.
Keyword: stepping frequency pulse compression sampling cardIFFT signal processing trigger card
目次
1 绪论.1
1.1 毫米波雷达背景研究1
1.2 毫米波高分辨率雷达1
1.3 本文主要研究内容3
2 毫米波脉间频率步进高分辨率雷达.4
2.1 毫米波脉间频率步进高分辨率雷达原理4
2.2 毫米波脉间频率步进高分辨率雷达性能参数6
3 毫米波脉间频率步进高分辨率雷达信号处理.9
3.1 脉间频率步进雷达信号处理概论9
3.2 基于 IFFT 的毫米波步进频率高分辨率雷达成像原理9
4 信号采集卡介绍及脉冲触发卡的设计.14
4.1 AC6684 采集卡.14
4.1.1 AC6684 采集卡性能参数14
4.1.2 AC6684 采集卡的输入通道及电压计算14
4.1.3 AC6684 采集卡的主要接口函数说明和应用15
4.2 触发卡设计软件Altium Designer6.9介绍 17
4.3 触发卡设计原理18
4.4 触发卡的原理图及PCB图 19
5 高分辨率一维距离像的MFC编程实现 24
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