Abstract
Detection of low cross-section targets in strong and varying clutter requires linear radar signal processing with a wide dynamic range. Analogue-to-digital (A/D) convertor characteristics are critical to achieving this dynamic range. A/D convertors generate internal noise and spurious harmonics due to nonlinearities, in addition to the theoretical quantisation noise. Harmonic distortion restricts the spurious-free dynamic range for signal detection, whereas the internal noise restricts the effective signal-to-noise ratio. To evaluate A/D convertor effects on airborne radar performance, a model has been developed, based on the measured harmonic levels of a 14-bit A/D convertor, and is included in an airborne radar simulation. The paper describes the details of the model and the radar simulation, and compares the performance of the high pulse repetition frequency (PRF) radar system using an ideal A/D convertor with that of the A/D convertor model. The results of this study provide a quantitative understanding of the relationship between A/D convertor parameters and radar performance.
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