Software MIMO three-dimensional imaging radar system

Abstract

The invention relates to the technical field of radar systems, in particular to a software MIMO three-dimensional imaging radar system which comprises a signal processing subsystem, a control and data acquisition subsystem, a transmitting subsystem and a receiving subsystem. A digital waveform is generated by using a software control program in the control and data acquisition subsystem, the digital waveform is converted into analog baseband signals through the transmitting subsystem, the analog baseband signals are up-converted into radio frequency signals through a mixer, the radio frequency signals are divided into two paths by a power divider, one path of signals is used for signal transmitting, the other path of signals serves as reference signals and is transmitted to the receiving subsystem after being attenuated by 40dB, so that time, frequency and phase synchronization between transmitting and receiving is realized by utilizing the reference signals at the seam of the transmitting subsystem, and a receiving local oscillator and a transmitting local oscillator have coherence. Therefore, the MIMO radar system has the advantages of being low in cost, light in weight and high in resolution.

Description

technical field [0001] The invention relates to the technical field of radar systems, in particular to a software-based MIMO three-dimensional imaging radar system. Background technique [0002] The imaging radar system can obtain high-precision multi-dimensional information of space-expanded targets, including distance, azimuth and elevation angle, etc., and has good adaptability to atmospheric environments such as clouds, rain and snow, and is not affected by lighting conditions, and can perform all-weather detection. It plays an irreplaceable role in economic and social development and national defense construction. [0003] Among them, the Multiple-Input-Multiple-Output (MIMO) imaging radar system forms virtual array elements through waveform diversity, which can obtain higher azimuth and elevation resolution under the condition of a limited number of array elements. Compared with synthetic aperture radar and inverse synthetic aperture radar, MIMO imaging radar can avoi...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a software-based MIMO three-dimensional imaging radar system using low-cost commercial SDR module components, through multi-channel design and signal processing to solve the problem that the commercial SDR module receives and transmits local oscillators that do not have coherence. The goal is to achieve high-precision 3D imaging

Images