High-range resolution for radar by oversampling and LMS pulse compression

High range resolution for radar systems can be achieved in combination with pulse compression of polyphase coded signals without an increase in the signal bandwidth of the antenna and receiver system. The received signal is oversampled with an increased clock rate to also use some of the information in the spectral side lobes. The compression filter function is computed by the least mean square error method to concentrate the compression result on one sampling value. Experiments are performed with echo signals measured with the experimental phased array system ELRA. Parallel measurements and evaluation with high and low bandwidth signals allow comparisons. With ELRA parameters, resolution can be improved by a factor of 4. The price for this is a loss of 6-9 dB in the signal-to-noise ratio, greater complexity for processing and a faster ADC