Abstract
Autonomous vehicles are regarded as future transport mechanisms that drive the vehicles without the need of drivers. The photonic-based radar technology is a promising candidate for delivering attractive applications to autonomous vehicles such as self-parking assistance, navigation, recognition of traffic environment, etc. Alternatively, microwave radars are not able to meet the demand of next-generation autonomous vehicles due to its limited bandwidth availability. Moreover, the performance of microwave radars is limited by atmospheric fluctuation which causes severe attenuation at higher frequencies. In this work, we have developed coherent-based frequency-modulated photonic radar to detect target locations with longer distance. Furthermore, the performance of the proposed photonic radar is investigated under the impact of various atmospheric weather conditions, particularly fog and rain. The reported results show the achievement of significant signal to noise ratio (SNR) and received power of reflected echoes from the target for the proposed photonic radar under the influence of bad weather conditions. Moreover, a conventional radar is designed to establish the effectiveness of the proposed photonic radar by considering similar parameters such as frequency and sweep time.
Highlights
The last decade has witnessed remarkable growth in photonic radar applications for detecting long-distance targets, image classification and military surveillance, monitoring flood terrains and using in space applications [1]
Photonic radars can extract information from targets by modulating radio frequency on optical signal which can be transmitted into free space by an optical transmitter [3, 4]
To compare with the proposed photonic radar, the sweep time of the conventional FMCW radar is set to 30 μs with the bandwidth of 600 MHz
Summary
The last decade has witnessed remarkable growth in photonic radar applications for detecting long-distance targets, image classification and military surveillance, monitoring flood terrains and using in space applications [1]. Photonic radars can extract information from targets (such as speed, image, distance and altitude) by modulating radio frequency on optical signal which can be transmitted into free space by an optical transmitter [3, 4]. It can collect the reflected signal (echoes) with the help of a receiver. Range and velocity resolutions can be improved further by using 77 GHz optical RF-LFM (Radio Frequency-Linear Frequency Modulation) signals to realize frequency modulated continuous wavelength based photonic radar (FMCW-PHRAD) along with long optical pulses and low peak power requirements [19, 20].
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