摘要
自适应谱线增强(ALE)算法能够提高高动态、低信噪比信号的载波频率估计精度。针对实际应用中该算法消耗硬件资源多、结构复杂、使用效率低等问题,提出了结合可编程逻辑门阵列(FPGA)优化的ALE算法结构方法,简化了ALE硬件电路。设计结果表明,改进ALE方法后,可实现信噪比为0～20 dBHz、最大多普勒动态为800Hz/s的测控信号载波频率准确估计。
The arithmetic of adaptive line enhancers （ALE） can improve carrier frequency estimation accuracy of high dynamic signal with very low signal to noise ratio （SNR）. However, the ALE structure is complex, and hardware resource is extensively consumed. To solve above problems, largescale field programmable gate array（FPGA）, which simplifies an optimized methed is proposed based on ALE circuits. It is proved that by the im- proved method, the carrier frequency of tracking telemetry and command （TF＆C）signal can be accurately esti- mated under the condition of signal to noise power spectrum density ratio 0 - 20 dBHz and dynamic doppler rate 800 Hz/s.
出处
《电讯技术》
北大核心
2012年第6期939-942,共4页
Telecommunication Engineering
