A Frequency Modulated Continuous Wave Radar Based on Numerical Control Oscillator

Abstract

The invention relates to a frequency-modulated continuous-wave radar based on a numerically controlled oscillator, and belongs to the technical field of integrated circuits. The frequency-modulated continuous-wave radar comprises a low noise amplifier, a mixer, an intermediate frequency amplifier, a filter, a signal processor, a power amplifier and a phase-locked loop, wherein the phase-locked loop comprises a digital control module, a numerically controlled oscillator, a phase discriminator and a low-pass filter. The frequency-modulated continuous-wave radar adopts an open-loop structure of the phase-locked loop composed of the numerically controlled oscillator and the like as a radar system signal source, effectively increases frequency scanning speed of the signal source, enables the frequency change time interval to reach nanosecond order, enhances system performance, and has the advantages of rapid signal source frequency change, high universality, simple structure, easy implementation, small unit size, high integratable density and the like, and is suitable for chip SOC.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits and relates to a frequency modulation continuous wave radar, in particular to a frequency modulation continuous wave radar based on a numerically controlled oscillator. Background technique [0002] FMCW Radar (Frequency Modulated Continuous Wave Radar) technology is a common ranging radar technology. The basic principle is that the transmitted wave is a continuous wave, and its frequency changes with time according to the law of triangular waves. The frequency of the echo received by the radar is similar to that of the transmitted frequency, both of which are triangle waves, but there is a time difference. Using this small time difference, the frequency offset can be further obtained, and finally the target distance can be calculated. Compared with pulse radar technology, it has the advantages of relatively simple structure, good reliability, and suitable for short-range detection pu...

AI Technical Summary

Problems solved by technology

However, these FMCW Radar structures still have the disadvantages that the signal source frequency hopping speed is not fast enough, it is not easy to change the signal source frequency, and the structure is extremely complicated under the high precision requirement, which is not conducive to realization.

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