| 可纠正多普勒频率误捕的扩频信号捕获改进算法 |
| |
| 引用本文： | 马琳,崔嵬,吴嗣亮.可纠正多普勒频率误捕的扩频信号捕获改进算法[J].北京理工大学学报,2009,29(10):898-902. |
| |
| 作者姓名： | 马琳 崔嵬 吴嗣亮 |
| |
| 作者单位： | 北京理工大学,信息与电子学院,北京,100081;北京理工大学,信息与电子学院,北京,100081;北京理工大学,信息与电子学院,北京,100081 |
| |
| 摘 要： | 针对直接序列扩频信号捕获过程中可能存在的多普勒频率误捕问题,提出一种可纠正此误捕问题的伪码捕获改进算法. 该算法利用首次捕获得到的伪码相位估计值对接收信号进行解扩,再通过快速傅里叶变换(FFT)对解扩后的信号进行多普勒频率估计,将首次捕获的多普勒频率估计值与FFT结果幅度最大值对应的频率点进行比较,判断是否发生了多普勒频率误捕,如果发生误捕,进行纠正,给出正确的多普勒频率估计值. 仿真结果表明,该算法能有效纠正多普勒频率误捕问题,得到正确的捕获结果.
|
| 关 键 词： | 伪随机码 捕获 多普勒频率 误捕 |
| 收稿时间： | 3/2/2009 12:00:00 AM |
Improved Acquisition Algorithm for Correcting False Alarm of Doppler Shift of Spectrum Spreading Signal |
| |
| MA Lin,CUI Wei and WU Si-liang.Improved Acquisition Algorithm for Correcting False Alarm of Doppler Shift of Spectrum Spreading Signal[J].Journal of Beijing Institute of Technology(Natural Science Edition),2009,29(10):898-902. |
| |
| Authors: | MA Lin CUI Wei and WU Si-liang |
| |
| Institution: | School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China |
| |
| Abstract: | Focusing on a kind of false alarm of Doppler shift in pseudo random (PN) code acquisition module of direct sequence spectrum spreading system(DSSSS) receiver, an improved code acquisition algorithm for correcting false alarm of Doppler shift is presented and analyzed. This algorithm uses the PN code phase estimation to eliminate PN code two-phase modulation effect, then gains Doppler shift estimation by fast Fourier transform(FFT), and compares the former estimation with the corresponding frequency point of the largest value in amplitude of FFT results. If there is wrong with the Doppler shift estimation, then to give the true value. The simulation results indicated that this improved method is reliable and effective. |
| |
| Keywords: | pseudo random code acquisition Doppler shift false alarm |
| 本文献已被 万方数据 等数据库收录！ |
| 点击此处可从《北京理工大学学报》浏览原始摘要信息 |
| 点击此处可从《北京理工大学学报》下载免费的PDF全文 |
|
