Title: Improving coherent averaging line spectrum detection with phase interpolation and compensation 

Author: CHEN Shaohua ZHENG Wei FU Jiwei  

Affiliation: No. 710 R & D Institute, CSIC 

Abstract: For the purpose of resolving the problem of performance deterioration introduced by inaccurate phase compensation in existing coherent averaging line spectrum detectors,a modified coherent detector is proposed.The three point interpolation in frequency domain is applied to obtain accurate estimate of phase difference between segments when the segmented length is not an integral multiple of the signal period.Then the segmented data are multiplied by a complex coefficient to remove the phase difference and synchronize the phases of all the segments before coherent averaging.Theoretical analysis shows that there will be a gain of3.9 dB at most by using the modified detector.The detection performance of the incoherent averaging power spectrum detector(AVGPR),the phase coherent averaging detector,the modified coherent averaging detector are compared with each other by computer simulations.The results coincide basically with the theoretical analysis,which show the superiority of the modified detector to the former two detectors.