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An improvement of adaptive line enhancer by means of coherent accumulation algorithm
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作者 HOU Baochun HUI Junying CAI Ping(Underwater Acoustics Institute of HSEI) 《Chinese Journal of Acoustics》 1990年第4期358-364,共7页
It is well known that the adaptive line enhancer (ALE) is effective detector of CW signal with unknown frequency in the background of white noise. The system processing gain of ALE, when the LMS algorithm is used, how... It is well known that the adaptive line enhancer (ALE) is effective detector of CW signal with unknown frequency in the background of white noise. The system processing gain of ALE, when the LMS algorithm is used, however, is not satisfactory because of the presence of iterative noise and weight noise. In this paper, the coherent accumulation algorithm of ALE, called as ALECA, is suggested. It is shown that the adaptive filter employing this new algorithm possesses the ARMA structure. The experimental results also show that the processing gain of ALECA is about 14dB higher than that of conventional ALE. 展开更多
关键词 ALE LINE An improvement of adaptive line enhancer by means of coherent accumulation algorithm
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High-Precision DOA Estimation Method Based on Synthetic Aperture Technique
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作者 Yongjia Dou Guangcai Sun +1 位作者 Yuqi Wang Mengdao Xing 《Journal of Beijing Institute of Technology》 EI CAS 2024年第2期111-118,共8页
The existing direction-of-arrival(DOA)estimation methods only utilize the current received signals,which are susceptible to noise.In this paper,a method for DOA estimation based on a motion platform is proposed to ach... The existing direction-of-arrival(DOA)estimation methods only utilize the current received signals,which are susceptible to noise.In this paper,a method for DOA estimation based on a motion platform is proposed to achieve high-precision DOA estimation by utilizing past and present signals.The concept of synthetic aperture is introduced to construct a linear DOA estima-tion model.A DOA fine-tuning method based on the linear model is proposed to eliminate the lin-ear DOA variation,achieving a non-coherent accumulation of DOA estimations.Moreover,the baseband modulation and the phase modulation caused by the range history are compensated to achieve the coherent accumulation of all the DOA estimations.Simulation results show that the proposed method can significantly improve the DOA estimated accuracy at low signal-to-noise ratios(SNR). 展开更多
关键词 synthetic aperture direction-of-arrival(DOA)estimation coherent accumulation
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SIMULATION STUDY ON AIRBORNE SAR ECHO SIGNAL
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作者 BaoHoubing LiuZhao 《Journal of Electronics(China)》 2004年第1期83-88,共6页
Through analyzing the influence on echo signal by factors of kinematical parameters of airborne SAR platform and radar antenna direction, this letter, on the basis of classical SAR echo signal analogue algorithm, puts... Through analyzing the influence on echo signal by factors of kinematical parameters of airborne SAR platform and radar antenna direction, this letter, on the basis of classical SAR echo signal analogue algorithm, puts forward certain airborne SAR echo signal analogue algorithm of distance directional frequency domain pulse coherent accumulation, and goes through simulation. The simulation results have proved the effectiveness of this algorithm. 展开更多
关键词 Airborne SAR Echo signal Range frequency domain coherent accumulation
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