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Research on the frequency domain Σ△-DPCA
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作者 Shen Mingwei Zhu Daiyin Zhu Zhaoda 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2008年第2期268-272,共5页
The frequency domain ∑A-DPCA processing (F-∑A-DPCA) is investigated in details and an improved scheme for the F-∑A-DPCA is proposed, which can significantly reduce the computational burden. In practice, because o... The frequency domain ∑A-DPCA processing (F-∑A-DPCA) is investigated in details and an improved scheme for the F-∑A-DPCA is proposed, which can significantly reduce the computational burden. In practice, because of the sum and difference beam pattern designed independently and other system errors, the clutter suppression of the time domain ∑A-DPCA processing (T-∑A-DPCA) is significantly degraded. However, the F-∑A-DPCA adaptively calculates the optimum gain ratio for motion compensation within each Doppler cells which is robust to system errors. Theoretical analysis and simulation results are presented to validate that the F-∑A-DPCA can achieve superior performance of clutter cancellation than the time domain processing, and its performance can be significantly increased if more pulses are used for the Doppler filtering. The improved approach is efficient, and feasible for real-time application. 展开更多
关键词 ∑a-beam ∑A-DPCA optimum gain ratio clutter cancellation.
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电子束焊活塞顶圈毛坯质量的超声波检测 被引量:1
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作者 倪培君 李旭东 张志洲 《兵器材料科学与工程》 CSCD 北大核心 1995年第6期48-52,共5页
电子束焊活塞顶圈毛坯对无损检测技术提出了多方面的要求。研究及实际应用表明:采用超声波五探头水浸检测法,可对活塞顶圈毛坯内冷油道位置、镶环结合质量及薄弱区域的铸造缺陷进行全面检测,从而保证顶圈毛坯质量。
关键词 电子束焊 活塞 顶圈 焊接 超声波 毛坯 检测
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