A low-complexity FMCW-SAR motion target imaging scheme has been proposed. This scheme consists of an FMCWSAR system and a moving object detection method. The FMCW-SAR system uses an equivalent virtual array to increase the number of transceiver antenna pairs, thereby improving radar azimuth resolution and the use of a PLL structure to improve signal linearity in FMCW radar. This hardware design improves radar imaging performance while reducing complexity. The motion target detection method controls the virtual array components to monitor the motion targets in real-time during the process of motion target monitoring. In the subsequent signal processing, signal interpolation is used to fill the signal used for imaging processing. The experiment shows that this method can effectively and accurately image the detected targets and has good time resource utilization.
Detecting the driver's vital signs can prevent safety hazards caused by sudden illness or drowsiness, which is essential for safe driving. In the traditional vital signs detection system for drivers, the fixed detection sensitivity will not adapt better to the complex and variable vehicle environment. Moreover, the complex vehicle environment will lead to the problem of the low SNR ratio of the detection signal, and the amplification will cause a distortion problem. The low SNR of the detection signal in complex environments and the signal distortion generated by the amplification. In this paper, the phase discrimination coefficient of the phase comparator is adjusted to make the system match different application scenes. It provides the flexibility to change the sensitivity and improve the dynamic detection capability. In addition, a digital controlled bias amplifier is used in the data processing part to adjust the bias and amplification of the signal. The impact of DC offset on the extraction of the effective signal is suppressed.
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