ALE-FFT algorithms for weak signal acquisition

Weak signal acquisition is the key problem of deep space detection. The paper discusses an improved weak signal acquisition technology which fits for acquiring the signals having high dynamic range and low signal to noise ratio (SNR). The adaptive line enhancer is applied before the FFT acquisition to improve the acquisition performance and reduce the acquisition time. The output SNR and the dynamic detection ability are enhanced by using the appropriate adaptive line enhancer. Aiming at the residual carrier, the acquisition methods that use the ALE-FFT and normal FFT are compared, the improved FFT acquisition algorithm has better acquisition performance. The spectrum estimation algorithm is discussed also.