| 摘要: |
| 步进频是穿墙成像雷达的常用波形，传统采用锁相合成技术的步进频穿墙成像雷达的跳频时间长，帧率很低，难以满足穿墙雷达实时成像的要求。为了解决这个问题，提出了一种新的扫描方案，可以通过现场可编程门阵列（FPGA）实现对扫描方式的可调控制，在不影响回波波形及成像效果的情况下显著提高了步进频穿墙成像雷达的帧率。在2 MHz的频率步长以及2.5 GHz的频段范围内时，实际成像帧率可以达到14 Hz，在一定程度上满足了实时成像的要求。试验测试结果验证了所提方法的可行性。 |
| 关键词: 穿墙成像雷达 实时成像 步进频 锁相合成 高帧率 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目(61271441,61372161) |
|
| A sweep frequency method for high frame rate stepped-frequency through-wall imaging radar |
| ZHANG Baowei,ZHU Guofu,LU Biying |
| () |
| Abstract: |
| Stepped-frequency is a common waveform used in through-wall imaging radar(TWIR). Traditional stepped-frequency TWIR,which uses phase-locked loop(PLL) frequency synthesis technology,has a long frequency hopping time and low frame rate. It’s difficult to meet the real time imaging demand of TWIR. To solve this problem,a novel scanning scheme is proposed in this paper,which can realize the adjustable control of scanning mode with Field Programmable Gate Array(FPGA). This scheme can evidently enhance the frame rate of TWIR without affecting echo waveform and imaging results. With step size equal to 2 MHz and frequency range equal to 2.5 GHz,the actual frame rate of imaging can reach 14 Hz. The requirements of real time imaging can be satisfied to some extent. The feasibility of proposed approach has been proved through experiment. |
| Key words: through-wall imaging radar real time imaging stepped-frequency PLL frequency synthesis high frame rate |
