Study Of Several Issues In Airborne Radar Signal Processing

The development of radar signal processing has been the core of the development of radar technology. The related units of the radar signal processing include pulse compression, moving target detection (MTD), non-coherent integration, constant false-alarm rate (CFAR), monopulse angle measurement, etc. Among them, the monopulse angle measurement is one of the key techniques in tracking radar. The stand or fall of angle error obtaining and the target glint are the main factors which related to the track precision of radar. This paper focuses on the research of influence on the performance of angle measurement which produced by the amplitude and phase imbalances in monopulse systems and the target glint.Based on the presentation of the related theory of airborne radar signal processing, the paper launch a thorough research on monopulse angle measurement. The impact of beam angle on the angle measuring performance is discussed. High-frequency phase difference and the resultant issue of null-depth are specially studied. The effect of amplitude and phase imbalances in sum and difference channels on estimation accuracy of angle error is also analyzed in detail, and the corresponding correction method is given. After the introduction of the glint generation principle, the angle glint suppression methods based on the high resolution profile is studied, and the angle glint suppression methods based on the frequency agility is analyzed in detail. A method of angle measurement by non-coherent integration based on square amplitude weighing is presented in this paper, simulation shows that the method can effectively suppress glint. The principle and signal processing flow of air-to-ground ranging (AGR) in airborne radar are introduced, and the accuracy of pitch error is analyzed.