Study of Pulse-Width and Amplitude-Phase Modulation Influence on the M-Sequences Correlation Characteristics

This paper considers the use of pulse-width modulation in modern small-size airborne radar systems to increase the resolution of images of the Earth's surface and improve the quality of radar surveillance. The use of complex signals with a wide spectrum allows to significantly increase the accuracy of object coordinates determination and improve radar images. The influence of pulse-width modulation parameters, such as pulse width and fill factor, on the characteristics of autocorrelation functions and the systems' ability to detect different types of objects under different conditions is investigated. Conventional M-sequences were used in the analysis, varying according to the use of different fill factors. The results showed that reducing the peak width of the normalized autocorrelation function improves the detection accuracy of radar signals