摘要
超宽谱(UWS)冲激雷达是一种新体制的无载波雷达,不能通过载波多普勒频率对目标速度进行测量,因此需要采用新的测速方式。文章首先对UWS冲激雷达时域多普勒测速原理进行了研究,并对测速精度进行分析,指出其影响因素。提高回波信号信噪比和测速精度的关键在于对动目标回波信号进行有效的相干积累,因此本文提出了回波时间预估的目标回波信号积累方法。最后,通过仿真实验表明,该方法能够很好的对回波信号进行积累,有效提高信号信噪比和测速精度。
Ultra-wide Spectrum (UWS) impulse radar is a new type of radar. There isn' t carrier frequency in UWS impulse radar, so no Doppler frequency of carrier can be used to measure velocity of moving-target. Then, the method of time-domain Doppler velocity-measuring is pointed out, and its measurement accuracy is analyzed. To improve the SNR and measurement accuracy, coherent accumulating of echo signal is necessary, and difficult, too. In this paper, a new method, time-estimating of arrival, is put up to accu- mulate echo signals. Finally, it is shown through simulation that echo signals can be effectively accumulated by the method, then SNR and measurement accuracy is largely improved.
出处
《信号处理》
CSCD
北大核心
2009年第4期532-536,共5页
Journal of Signal Processing
基金
国家高技术863项目(2007AA803506)
关键词
UWS冲激雷达
时域多普勒
速度测量
回波时间预估
相干积累
UWS impulse radar
Time-domain Doppler
Velocity-measuring
Time-estimating of arrival
Coherent accumulating