Research On Key Techniques Of Continuous Wave Radar Low-elevation Measurement Applications

When land or sea-based radar tracking some low-flying targets, it will always be some echo signal multi-path interference, which always greatly affects the low-altitude targets radar pitch angle measurement. With the target flying, multi-path echo signal effects are periodic of enhancement and attenuation. On the other hand, low-altitude targets radar measurements, at the same time, are jammed by ground clutter interference. Just because of these two reasons, low-elevation measurements of radar signal processing has always been a difficult task.In this paper, on the basis of the method which is known from reference[1], possible engineering solutions and the key technology can be determined. Those including:Do some research on the C2 algorithm, other traditional and improved methods of measuring angles under the continuous wave system. Using low-elevation measurements to actually testify different methods in measuring the performance of low elevation method. Focus on the C2 algorithm by choosing different parameters, analysis of survey data results and the relationship between different parameters, and use it to guide engineering design.And use some help to improve the precision of angle measurement methods,such as the correction of discrete spectrum and acceleration correction.Engineering implementations are designed based on the C2 algorithm angle measurement. And potential errors in project implementation are analyzed.FFT implementation method is selected,complex multiplication is realized based on Lifting Scheme.From the simulation results, we can reduce the error power, improve the efficiency of system.The main issue is to research the engineering techniques of the C2 angle-measure algorithm. The purpose of choosing the algorithm is to achieve performance in line with the premise of saving resources to maximize the criterion, and to give full play to FPGA flexible, fast, reconfigurable features. The research results can be applied not only to target low-flying low-elevation measurements, but also for other digital signal processing project implementation.