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采用长时间常数杂波跟踪回路来修正高脉冲重复频率雷达的速度输入和本地振荡器中的漂移,从而使虚假信号和旁瓣杂波对跟踪器误差的影响减至最小。雷达惯性导航系统产生一个预测的杂波频率信号,并与主瓣杂波多卜勒频率信号混频。得到的任何误差信号(即预测的杂波信号频率与实际接收的多卜勒杂波频率信号之差),当天线每扫描360°时便在天线各扫描象限里被检测出来和加以平均。来自相邻象限的速度误差分量,用来校准下一个天线扫描期里预测的杂波频率信号的杂波速度,而在一次扫描期里所有象限的平均误差用来对本地振荡器的漂移误差进行补偿。
A long time constant clutter tracking loop is used to correct the speed input of the high pulse repetition frequency radar and drift in the local oscillator to minimize the effects of spurious and sidelobe clutter on the tracker error. The radar inertial navigation system generates a predicted clutter frequency signal and mixes with the mainlobe clutter Doppler frequency signal. The resulting error signal (ie, the difference between the predicted clutter signal frequency and the actual received Doppler clutter frequency signal) is detected and averaged in each scanning quadrant of the antenna for each 360 ° scan. The velocity error component from the adjacent quadrant is used to calibrate the clutter velocity of the predicted clutter frequency signal during the next antenna sweep and the average error of all quadrants over one sweep period is used to local oscillator drift error make up.