Correlative Waveform Coding for Interference Mitigation in VHF Radar System

The sequencing pattern in very high-frequency radar interface has a critical role in designing waveform for automotive radar application. The automotive radar application has a need of generating signal to predict the target accurately, with radial velocity simultaneously under various ambiguity conditions. The target and velocity measure were made using a multi-frequency shift keying (MFSK) method, in target measurement range and radial velocity simultaneously. The radar uses a frequency and phase shift measurement in defining the target range and velocity. However, dual measure of these parameters has an additional processing overhead and is lower in accuracy. The frequency-based measurement has a greater significance in this usage. To achieve the objective, chirp signals are used with a very short time duration. Chirp sequence has been used in defining the target range and velocity under multi-target condition. Chirp sequence, however, has a Doppler ambiguity issue. Two chirp sequence approaches are presented recently, defined with a large carrier frequency shift to overcome the stated problem. However, the chirp sequencing wrt interference monitoring is not observed. This paper outlines an approach for chirp sequence coding for MFSK based on correlative pattern matching for code allocation to improve the accuracy of detection in radar application.