| In this thesis, computer simulations and experimentation in the laboratory have been performed to study the sidelobe cancellation of complementary-coded pulse radar for the purpose of building a prototype. A simulation model was first built that includes waveform generator, modulators, targets, demodulators, waveform compressors, and envelope detector. With the simulation model, sidelobe cancellation was verified for ideal case. In addition, the effects of phase shift and amplitude imbalances on sidelobe level were evaluated. It was found that the magnitude of the maximum sidelobe peak increases linearly as phase shift increases. Doppler phase shift is not a concern for complementary-coded radar to be carried on an airplane for ice measurement. The peak sidelobe level (PSL) was found to increase nonlinearly as amplitude imbalances increase. Experiments were then performed in the laboratory to understand the effects of hardware imperfections on sidelobe cancellation. The waveform amplitude imbalances caused by the waveform generator, modulator, and demodulator were found to be the main obstacle to sidelobe cancellation. Simulations that included the averaged amplitude imbalance of the measurements were used to verify the experimental results. Finally a prototype of complementary-coded pulse radar was proposed for future work. (Abstract shortened by UMI.)... |
