摘要
针对直扩/跳频混合扩频测控中对多点频率估计值提取困难的问题,提出了一种利用IIR自适应频率估计器实现多频点估计的算法。分析了IIR滤波特性,表明二阶IIR模型具有单峰特性,能够实现稳定收敛;而高阶IIR模型具有多态性,因此需要对估计参数进行初始化。仿真结果表明当信号载噪比不低于10dB-Hz时,自适应频率估计器能够实现对多频点信号频率跟踪,频率估计误差小于0.1Hz,相同环境下频率估计精度与锁相环相当。
According to the problem that it is difficult to estimate multi - frequency in the DS/FH hybrid spread spectrum TT&C, the algorithm of using IIR adaptive frequency estimator to estimate multi - frequen- cy is presented. The properties of IIR filter are analysed, which shows that it has single peak and stabile convergent performance. But the high -order IIR filter model must initialize its parameters because of multi - state. The simulation shows frequency track of multi - frequency signal can be performed by adap- tive frequency estimator. The frequency estimation error is fewer than 0.1Hz when the CNR is no less than 10dB- Hz, and it has the same estimation accuracy as phase lock loop(PLL) under the same condition.
出处
《电讯技术》
北大核心
2010年第2期1-5,共5页
Telecommunication Engineering
基金
武器装备预研基金资助项目(9l40A24090608KG02)~~
关键词
扩频测控系统
IIR模型
自适应频率估计
多频率估计
spread spectrum TT&C system
IIR model
adaptive frequency estimator
multi - frequency estimation