Computer simulation studies have been conducted on the range side lobe performance of a pulse compression radar system which uses a complementary biphase-coded signal transmission. Such a coding scheme is widely used in mesosphere-stratosphere-troposphere (MST) radars expecting to achieve ideally zero range side lobes to ensure unambiguous detection of signals. However, system parameters, like overall system bandwidth, delay distortion, limiting, amplitude and phase droop within the pulse, can lead to spillover of a target return into adjacent range bins by raising the range side lobe level. The results of the study indicate that a goal of 20-dB range side lobe level can be achieved with matched filter bandwidth and reasonable levels of amplitude and phase distortions in the signal path.
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