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小时带积线性调频信号由于其频谱非常严重的菲涅尔波动,从理论上限制了压缩脉冲的旁瓣电平,而实际器件由于受制作工艺和声表面波二阶效应的影响,旁瓣电平抑制还会差些。用“反波动设计法”制作的器件旁瓣电平有较大的改善,但同时多普勒频移(fD)敏感度的增大却又限制了它的应用范围。 本文简要报道利用一般的设计方法,在器件设计制作上作一些特殊考虑,研制出时带积为27的低旁瓣电平及对多普勒频移敏感度较小的声表面波色散延迟线,并给出了器件的性能参数和波形。
Because of the Fresnel wave with very serious frequency spectrum, the linear frequency modulated signal with hours limit theoretically limits the side lobe level of compressed pulse. However, due to the influence of the fabrication process and the second-order effect of SAW, Flat inhibition will be worse. The sidelobe level of the device fabricated by the “anti-ripple design method” is greatly improved, but at the same time the increased sensitivity of the Doppler shift (fD) limits its application. This article briefly reports the use of general design methods in the design of the device to make some special considerations, developed a low sidelobe level of 27 with a small side-tone and Doppler shift less sensitive to surface acoustic wave dispersion delay line , And gives the device performance parameters and waveforms.