数字宽带LFM信号的数据率对脉冲压缩性能的影响

用数字方式合成超宽带LFM信号时，由于工作时钟和数据率的限制，信号的相位存在不连续性。本文从数据率对宽带数字LFM信号脉压波形的影响的分析和仿真入手，提出了对于大时带积（D〉4000）LFM信号，只要相位更新数据率等于或大于信号带宽，低频率更新数据率对其脉压性能不会造成严重影响，得出用低频率更新数据率器件同样可以产生脉压性能良好、信号带宽4倍或8倍于其频率更新数据率的超宽带LFM信号的结论，从而为用较低频率更新数据率的DDS器件产生带宽接近其相位更新数据率的宽带LFM信号提供了理论依据。

The Effect of Wideband LFM Signal Data-Rate on Pulse Compression Performance

When the ultra-wideband LFM signal is synthesized through digital method,its phase discontinuousness exists because of limiting of the work clock and data-rate.This paper analyzes and simulates the influence of data-rate on compressing wave of wideband LFM signal.It is presented that lower frequency update data-rate don't influence seriously to pulse compression performance for the wideband LFM signal((D>4000),) if its phase update data-rate is not less than signal bandwidth.Lower frequency update data-rate devices can also be used to produce the high performance ultra-wideband LFM signal whose bandwidth is 4 or 8 times of the frequency updata data-rate.This provides the theoretical basis for that using the lower frequency update data-rate device synthesises wideband LFM signal with bandwidth near to the phase update data-rate of the devices.