调频脉冲串相参合成研究与FPGA硬件实现

介绍了利用调频脉冲串合成宽带信号的原理，进行了合成宽带信号的仿真。给出了基于FPGA的调频脉冲串产生的硬件实现电路。利用该电路得到了中频信号的测量波形，通过后处理将3个30MHz带宽的子脉冲合成了等效带宽90MHz的信号。验证了用调频脉冲串合成宽带信号来提高雷达距离分辨率方法的正确性和有效性，及其工程可行性。

Synthetic Bandwidth of Stepped Chirp Study and Implement

High range resolution(HRR) is an important aspect of the development of Synthetic Aperture Radar.High resolution in range is in proportion to the bandwidth of transmitted signal.In the application of space bore SAR,the increase of system instantaneous bandwidth will cause much difficult in generating,transmission and receiving of the signal for the limitation of hardware.So generation of wide bandwidth signals in current hardware level,and improvement of range resolution with no increasing of system instantaneous bandwidth by employing new waveforms have significant meaning and high practical value.The synthetic bandwidth technique employed stepped chirp is one effective method with such characteristic.The principle of the method is introduced,and simulation of synthetic bandwidth is carried out.The hardware circuit of the generation of stepped chirp based on FPGA is Presented.The experimental result of the generator output on the medium frequency is acquired,and then the combination of 3 subpulse with 30 MHz bandwidth to one 90 MHz bandwidth signal is implemented,which show that high range resolution by means of synthetic bandwidth generated by stepped chirp is correct,effective and practical.