Influence of an interfering second target on a certain amplitude-comparison monopulse radar system

Angular tracking performance in an amplitude-comparison nonpulse tracking radar employing both AGC and PLL is examined for the case where an interfering target as well as the main target are present within the beam of the tracking radar. Quantitative results are obtained which clarify the conditions under which target lock can be maintained, showing the effects that the interfering target has on such performance. The analysis is performed using the harmonic balance method to obtain an approximate evaluation and Galerkin's method to obtain a rigorous evaluation. It is found that, for practical applications, the harmonic balance method provides a sufficiently close approximation when the PLL bandwidth is not large.