Research on 2-Channel Outdoor Instrumentation Radar

To meet the requirements of the outdoor radar target scattering measurement, a 2-channeI instrumentation radar based on pulse-to-pulse frequency shifting technique was designed and realized. The radar can perform radar-cross section (RCS) measurement simultaneously on two fixed frequency band, and test 2-dimension imaging cooperated with a rotation platform. The pulse-to-pulse frequency shifting technique avoids the problems causing by the nonlinear error of the linear frequency modulation. To farthest eliminate the errors causing by the outdoor phantom signals and the background clutters, a series of range gate pulses generated by FPGA were set and the high resolution imaging technique was used. The quadrature errors can be corrected by a real time calibration branch. The principles of the pulse-to-pulse frequency shifting are summarized, the design and realization are presented, the hardware in the loop simulation method is introduced and the test result is given and analyzed