Proceedings Article | 27 December 2022
KEYWORDS: Radar, Target detection, Signal detection, Signal generators, Signal to noise ratio, Modulation, Environmental sensing, Semiconductor lasers, Analytical research, Antennas
Among several sensors, photonic RADAR has shown potential performance in range detection, radial velocity, “allweather” system, and distance resolution. With an increase in the applications of the photonics RADAR, disturbances such as interference, intrusion, and jamming due to multiple radars operating simultaneously in “close-proximity”, misdirecting, and misleading in a multi-radar environment can be substantial unless a suitable mitigation technique is employed. Therefore, in a multi-radar environment, analyzing the impact of disturbances on the radar system is of utmost importance. Hence, in this paper, we mainly focus on (i) analyzing disturbances and their effect on the output performance of the widely used LFM radar waveforms, (ii) generating a robust waveform, photonics-based frequency hopping LFM (Ph-FHLFM), and (iii) detecting target objects in the presence of disturbances. In analyzing the effect of disturbances, we focused on the interference with different radar waveforms and spoofing in the Victim’s radar performance, followed by the generation of the Ph-FHLFM. The basic principle involved in the demonstration of the PH-FHLFM is the usage of the abrupt intensity modulation of the optical beam for the abrupt redshift in the emission wavelength of the semiconductor. Four-step Ph-RHLFM and its reconfigurability in hopping steps and center frequency are demonstrated. Further, mitigation of interferences by Ph-FHLFM through the detection of target objects in the presence of disturbances and the comparison with conventional LFM is demonstrated. Hence, the proposed technique can be used for the multi-radar environment, such as autonomous vehicles, navigation, and defense system for safety and security.
