Combined effect of phase and RGPO delay quantization on jamming signal spectrum

This paper deals with the analysis of jamming signals emitted by ECCM systems after phase quantization, performed by radio frequency digital memory (DRFM) devices, and after introduction of increasing time delay. The analysis presented here shows first the exact solution to the problem of calculating the spectrum of a phase-quantized jamming signal when the quantization levels are equally spaced. The spectrum of the signal presents a primary term, which is simply an attenuated version of the signal received by the ECCM system, and false terms whose amplitude and location depend on the number of quantization bits. Afterward, the effect of time delay quantization introduced by range gate pull-off devices is analytically evaluated, combined to the phase quantization. Results show that this second distortion can be generally neglected with respect to the spurious terms due to the phase quantization.