Pulse compression technique is widely used in modern radar systems . large timeband product signals such as linear frequency modulation signals ( lfm ) , nonlinear frequency modulation signals ( nlfm ) , phase coded signals and so on are used in pulse compression technique to improve the resolution in range domain 现代雷达系统广泛采用脉冲压缩技术,在确保雷达作用距离和速度分辨力的前提下,采用大时带积脉冲压缩信号:如线性调频( lfm ) 、非线性调频( nlfm )和相位编码信号等,提高距离分辨力。
This system can process linear frequency modulation signals ( lfm ) , nonlinear frequency modulation signals ( nlfm ) and taylor quadriphase code signals with time width under 42 s and band width under 5mhz . the experimental results demonstrate that the specification characteristics meet the requirements of practical radar systems 该系统可处理时宽在42 s以内?带宽在5mhz以下的线性调频信号( lfm ) ,非线性调频信号( nlfm )和taylor四相码信号,且技术指标完全满足实用系统的设计要求。
The above waveforms discussed are to synthesize the wb or uwb with narrow band pulses . assuming the transmitting uwb linear frequency modulation ( chirp ) , dechirp processing is introduced , and the method involved to obtain high resolution by reducing the if bandwidth is presented . furthermore , dechirp processing used to sar imaging is discussed , and the processing steps are described < wp = 4 >以上研究的两种信号形式都是通过窄带子脉冲串相参合成的方法来获得超宽带回波信号,本文还探讨了去斜率( dechirp或stretch )方法,分析了去斜率降低接收机中频带宽、 fft获得目标一维距离像的原理,并探讨了线性调频去斜率合成孔径雷达成像,给出了具体实现步骤。
This makes wide - band digital receiver become a certain trend in the detecting and intercepting of radar signals field . in this dissertation , the parameter estimation algorithms for the monopulse signal , the linear frequency modulation signal and the phase coded signal are studied . according to the algorithms , a hardware platform is set up and tested using tms320c6713b mainly 本文对单脉冲信号、线性调频信号和相位编码信号这三种常见的雷达信号的参数估计算法作了研究和验证,并根据这些算法要求,立足于当前数字信号处理芯片( dsp )的发展,基于tms320c6713b构建了一个信号参数估计的硬件平台。