中文摘要：

为了解决脉冲雷达的探测距离与距离分辨率的矛盾，发射拥有大时宽带宽积的线性调频信号，使雷达既有较大的探测距离，又有很高的距离分辨率。由于收发开关的转换，宽的线性调频信号会造成近距离盲区，传统解决方式是分时发射一长一短两个信号，但会造成数据率降低。这里提出一种基于频分复用技术的双线性调频信号，在近程接收短脉冲，弥补宽线性调频信号的不足，通过仿真，这种信号既能保证雷达无论目标距离远近都有较高的分辨率，又可以消除近程盲区。

英文摘要：

In order to solve the contradiction between detection range and range resolution of pulse radar, the LFM signal with large time-bandwidth product is chosen to be modulated on the transmitter pulse so that the radar is of larger width and higher range resolution. Wide LFM signal may lead to close range blind zone due to conversion of the transceiver switches. Time- share launching of one long and one short signals is the traditional solution, but it will cause a lower data rate. A kind of dual- LFM signal based on frequency division multiplexing technology is presented and the short pulse is used in short range to offset the lack of wide LFM signal. Through simulation, it is guaranteed that, by using this kind of signal, the radar has a higher reso- lution regardless of the short- or long-distance target and can eliminate the short-range blind zone.