Abstract:
In order to overcome the shadowing problems due to interfering targets in radar target detection, a proposal of combining the use of the square root (SQRT) law and quartic root (QURT) law with cell-averaging constant false-alarm rate (CA-CFAR) detector is suggested in this paper, making the performance of radar detection less prone to the adverse impact of the interfering targets. Compared with conventional linear law and square law, SQRT law and QURT law fail to cause additional detection loss; moreover, SQRT law and QURT law exhibit higher implementation efficiency while comparing with the logarithmic law and ordered-statistic CFAR (OS-CFAR) detector used for inhibiting the shadow effect due to interfering targets. The experiment based on the true radar data shows that the inhibiting capability of the QURT law for interfering targets is improved by more than 10 dB than that of the linear law, when the echo signal of isolated interfering target is 40 dB higher than background noise, and the number of samples used to estimate the power of background noise equals to 32.