Millimeter wave radar system is featured by low power consumption, whose strong penetration, owing to the short wavelength all-weather operation. With the rapid development of modern detection, the need of high-quality fast imaging algorithm urgent for security detection. In this paper ,a three-dimensional imaging algorithm on frequency domain is proposed to visualize the target. In detail, a linear frequency modulated continuous wave (LFMCW) radar with working frequency from 60GHz to 64GHz is used to acquire data on which the target image is reconstructed. The basic principles of linear frequency modulation continuous wave radar are introduced in the beginning, then, the echo signal model of the single input single output (SISO) imaging system and the procedures of imaging algorithm are deduced at length The scanning imaging experiment of the target is carried out to evaluate the proposed algorithm, ending up with fine contour of the target. Besides, the resolution of the actual image is obtained by analyzing the image contour. Finally, theoretical resolution is calculated on condition that center frequency equals 62GHz and aperture equals 20cm in both vertical and horizontal directions. The comparison suggests that the actual performance of radar is consistent with the expected one.
With the continuous development of modern industry, high-precision dynamic monitoring systems are essential to ensure the safety and efficiency of production. Therefore, the terahertz radar system based on frequency modulation continuous wave (FMCW) was studied in this work, aiming at realizing high-precision dynamic monitoring of coal levels in coal bunkers. The system adopts the FMCW method to measure the target distance by transmitting continuous linear frequency modulation signals and using the frequency difference and time delay between the received signal and the transmitted signal. The frequency selection algorithm is combined with the phase estimation algorithm, and the spectrum is refined by Zoom-FFT algorithm to improve the range resolution. The phase estimation algorithm is used to supplement and improve the ranging accuracy to ensure the reliability of the ranging results. To verify the feasibility of the system, field tests were conducted at 120-124 GHz frequencies and 4 GHz bandwidths. The system has a maximum operating range of 50 m, a beamwidth of 4 degrees, and a theoretical range resolution of up to 0.5 mm. By integrating optimization algorithm, the terahertz radar system can realize high-precision dynamic monitoring of coal level in the bunker, and show excellent anti-interference ability and stability, showing great practical application value.
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