Research on the Integrated Working Mode Based on Positive and Negative Frequency Modulation in Radar Communication Integration

Abstract

Nowadays, the fast development of the digital circuits results in a more and more high digital level of radar system. Especially, the development of the solid-state active module, the high-speed multi-digital A/D convertor, the direct digital synthesizer (DDS), and universal use of the high-speed digital signal processor provide an outstanding basis of the radar communication integration. Minimum Shift Keying Linear Frequency Modulation (MSK-LFM) is a novel multifunctional radar waveform. For all above, this paper proposes an integrated working mode based on positive and negative frequency modulation in radar communication integration. In the mode, the radar main station transmits positive linear modulation frequency signals, however, the communication affiliated station transmits negative linear modulation frequency signals. Their orthogonality causes less interference. Through the derivation, the method for the orthogonality improvement is obtained. The effectiveness of this working mode is proved by the simulations.