频率估值自同步方案设计与性能分析  

The design and analysis of self-synchronization scheme based on spectral-estimation

作　　者：杜传报[1] 全厚德[1] 赵寰[1] 崔佩璋[1] 

机构地区：[1]中国人民解放军军械工程学院,河北石家庄050003

出　　处：《电子技术应用》2011年第9期122-125,共4页Application of Electronic Technique

摘　　要：现有跳频自同步方案中抗干扰性能最强的方法是串行滑动相关法和并行匹配滤波两种方案,但是滑动相关法捕获速度比较慢,匹配滤波法系统结构比较复杂。为了克服这些缺点,提出了频率估值自同步方案,该方案使用STFT获取跳频载波频率,利用频率控制字逆向恢复PN序列以获取系统同步。从捕获时间期望、抗干扰性能及系统复杂度三方面对新方案进行了评价,从理论及程序仿真验证了方案在大信噪比下的可行性。本方案在大信噪比信道中有较强的抗干扰及快速捕获能力。Modern frequency hopping systems generally use sliding correlation scheme and the matched filter scheme which has the best anti-jamming performance. However, the sliding correlation scheme converges too slowly while the matched filter scheme occupies too much hardware. To solve this disadvantage, the design of self-synchronization scheme based on spectral-estimation is advanced. It uses STFT to obtain carrier-frequence and frequence-controller words, we will get PN sequence to make system syn- chronization. The scheme was evaluated in the performance of acquisition time, anti-jamming ability and system complexity. And we proved the feasibility of this scheme in the high SNR channels in theory and simulation program. This scheme has excellent an- ti-jamming ability and reduces the acquisition time in the high SNR channels.

关 键 词：自同步捕获 短时傅里叶变换 频谱分析 捕获时间期望 射频全宽开低通采样结构 

分 类 号：TN924.2[电子电信—通信与信息系统]