| 改进的快速短时傅里叶变换算法在跳频信号分析中的应用 |
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| 引用本文： | 张曦,杜兴民,茹乐. 改进的快速短时傅里叶变换算法在跳频信号分析中的应用[J]. 探测与控制学报, 2007, 29(2): 30-34 |
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| 作者姓名： | 张曦 杜兴民 茹乐 |
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| 作者单位： | 空军工程大学工程学院,陕西,西安,710038 |
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| 摘 要： | 考虑到哈特莱变换对于实信号频谱分析的高效性，在分析哈特莱变换与傅里叶变换相互关系的基础上，给出了离散哈特莱变换（FHT）基2算法的推导，并将其计算量与FFT算法进行了比较，最后应用高效的离散哈特莱变换（FHT）基2算法对快速跳频信号进行了STFT时频分析。仿真结果表明该方法能够有效地分析随时间快速跳变的跳频信号。通过比较可以看出该算法运算量较小，可有效节约运算时间，适合于快速跳频信号的实时分析和跟踪干扰。
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| 关 键 词： | 跳频 哈特莱变换 傅里叶变换 时频分析 |
| 文章编号： | 1008-1194（2007）02-0030-05 |
| 收稿时间： | 2006-08-25 |
| 修稿时间： | 2006-08-252006-11-29 |
Application of a Modified Fast STFT Method in Frequency Hopping Signals Analysis |
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| ZHANG Xi,DU Xing-min,RU Le. Application of a Modified Fast STFT Method in Frequency Hopping Signals Analysis[J]. Journal of Detection & Control, 2007, 29(2): 30-34 |
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| Authors: | ZHANG Xi DU Xing-min RU Le |
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| Abstract: | Considering Hartley transform's effectiveness in analyzing frequency spectrum of real signal,this paper analyzes the relations of DHT and DFT,inferres radix-2 FHT algorithm from the definition of DHT,and compares its amount of calculation with FFT algorithm.At last,fast frequency hopping signals is analyzed using STFT time-frequency method based on radix-2 FHT algorithm.The simulation results show that it is effective to analyze fast frequency hopping signal in both time and frequency domains by using this method.The comparition shows this algorithm can reduce computation,save operation time and is suitable for real-time analyzing and tracking jamming of frequency hopping signals. |
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| Keywords: | frequency hopping signals Hartley transform Fourier transform time-frequency analysis |
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