Three-dimensional radar level meter based on vertical linear array and design method thereof

Abstract

The invention discloses a three-dimensional radar level meter based on a vertical linear array and a design method thereof, and relates to the technical field of millimeter wave radar imaging. The method comprises the following steps of: selecting appropriate array elements, selecting an appropriate voltage-controlled oscillator, selecting an appropriate primary noise amplifier, an appropriate low-pass filter and an appropriate power amplifier, selecting a four-channel 16-bit digital-to-analog conversion module, selecting an appropriate digital phase compensation synthesizer, carrying out two-dimensional distance direction correction on echo signals, and performing imaging through a response function of a receiving signal inversion target. According to the method, on the premise that the size and the cost are not increased, high resolution can be guaranteed, and faster imaging performance can be achieved.

Description

technical field [0001] The invention relates to the technical field of millimeter-wave radar imaging, in particular to a three-dimensional radar level gauge based on a vertical linear array and a design method thereof. Background technique [0002] The RF front-end transmits a continuous wave with changing frequency during the scanning period. The echo reflected by the target has a certain frequency difference from the transmitted signal. The distance information between the radar and the target is obtained by measuring the frequency difference. , theoretically there is no ranging blind area, the average power of the transmitted signal is equal to the peak power, which can reduce the probability of being intercepted, and the echo signal becomes a narrow-band difference frequency signal after being amplified by mixing. Processing, extracting the distance and azimuth information of the target in the signal spectrum, and imaging the different signals obtained to obtain the thre...

AI Technical Summary

Problems solved by technology

The mechanical scanning method can maintain a fixed bandwidth in the scanning width in a fixed direction, and can achieve a good scanning effect. However, in the process of forward-looking imaging, the mechanical scanning method has a slow speed, resulting in a slow imaging speed. Due to the limitation of the synthetic aperture, Unable to achieve any angle imaging

Synthetic aperture radar also has disadvantages such as difficulty in forward-looking imaging, long imaging time, inability to image when the platform is stationary, and the need for high-precision motion measurement

[0004] Although phased array radar can obtain high-resolution imaging, the cost of phased array radar is high, and it is generally only used in military fields or special fields. Even if UWB radar antennas are used, sparse arrays with fewer array elements are used. Due to the problem of grating lobes However, there are still some limitations

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