摘要
为了解决FFT算法中因能量泄露和栅栏效应而导致的算法估计性能下降的问题,提出了一种基于FFT的自适应频率估计算法。分析了Rife算法,指出当信号频率位于量化频率附近时,由于插值方向错误,会导致频率估计性能下降;对于分段FFT相位差频率估计算法,当2段信号最大谱线处对应的相位相差比较大时,容易产生相位模糊,从而增大估计误差。基于FFT的自适应频率估计算法将2种算法进行了综合,既保留了2种算法的优点,又对算法性能有所改进。仿真结果表明:该算法的估计精度、稳定性和抗噪能力都有显著提高。
Aiming at the problem that the performance of FFT algorithm about frequency estimation is obviously declined because of energy leakage and picket fence effect,an adaptive frequency estimation algorithm based on FFT is presented.In this paper,the Rife algorithm is analyzed and it is pointed out that the frequency estimation performance is caused to decline due to the error of interpolation direction when the signal frequency is close to quantized frequency of FFT.As for the segmented-FFT phase difference frequency estimation algorithm,the phase ambiguity tends to be produced when the phase difference at the maximum spectral line of 2 segments is big so that the estimation error is increased.This adaptive algorithm is a combination of these two algorithms,not only retaining the advantages of the two algorithms but also effectively making improvement.The simulation results show that the estimation precision,antinoise performance and stability of algorithm have been significantly improved.
出处
《装甲兵工程学院学报》
2013年第4期57-59,95,共4页
Journal of Academy of Armored Force Engineering
基金
军队科研计划项目
关键词
FFT算法
Rife算法
相位差频率估计算法
自适应频率
频率估计
FFT algorithm
Rife algorithm
phase difference frequency estimation algorithm
adaptive frequency
frequency estimation
