Research on Hardware-in-the-loop Simulation of Stepped Frequency Ultra-wideband Radar

The stepped frequency signal is an important signal form to improve the range resolution of radar system, which effectively reduces the hardware requirements for ultra-wideband radar system. This article uses two signal generators, a spectrum analyzer and an oscilloscope to establish a stepped frequency ultra-wideband radar hardware-in-the-loop simulation system, and obtains super-resolution range signal through frequency domain wideband synthesis. Combining hardware-in-the-loop simulation with computer data processing, the experimental results show that the time resolution of the ultra-wideband signal synthesized by 35 28MHz sub-pulses is up to 1.06ns. The larger the bandwidth formed by the stepped frequency, the higher the range resolution, which verifies the effect of the stepped frequency on improving the range resolution.