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提出了一种用于机载导航雷达接收机测试的多普勒频率模拟方法。该方法利用直接数字合成技术,产生与雷达中频实时相参、多普勒频率灵活可调的目标回波信号,多普勒频率调节步进可达1Hz。利用该方法设计的多普勒雷达信号模拟器已经实际用于某导航雷达接收机的测试。
A Doppler frequency simulation method for airborne navigation radar receiver testing is presented. The method uses direct digital synthesis technology to generate real-time coherent radar intermediate frequency, Doppler frequency flexible adjustable target echo signal, Doppler frequency adjustment step up to 1Hz. The Doppler radar signal simulator designed by this method has been actually used in the test of a navigation radar receiver.