A modulation and de-modulation technique for quadraphase pulse compression codes

Pulse compression is an important component of many modern radar systems. It is used to address the problem of a radar that needs simultaneously a long pulse width for detection at long ranges, and high range accuracy and resolution. A penalty suffered by pulse compression is that a given pulse compression code have side-lobes associated with it that can cause a large object or a number of smaller objects close to a range cell to interfere with the return in that cell. In this paper we propose a technique which can modulate the true quadraphase codes to achieve a suitable spectrum for transmission and which can be demodulated in a manner which is consistent with pulse compression objectives.