A Frequency Modulated Continuous Wave Radar Based on Numerical Control Oscillator

A digitally controlled oscillator and frequency-modulated continuous wave technology, applied in instruments, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve the problem that the signal source frequency jump speed is not fast enough, it is difficult to change the signal source frequency, and it is unfavorable to realize and other problems, to achieve the effect of fast frequency hopping, strong module versatility, and fast frequency change

Active Publication Date: 2018-04-27
PEKING UNIV
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  • Abstract
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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.

Method used

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  • A Frequency Modulated Continuous Wave Radar Based on Numerical Control Oscillator
  • A Frequency Modulated Continuous Wave Radar Based on Numerical Control Oscillator
  • A Frequency Modulated Continuous Wave Radar Based on Numerical Control Oscillator

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Embodiment Construction

[0022] The present invention will be further described below through specific embodiments and accompanying drawings.

[0023] Such as figure 2 Shown is a kind of FM continuous wave radar based on digitally controlled oscillator that the present invention realizes under CMOS technology, and it comprises low noise amplifier, mixer, intermediate frequency amplifier, filter, signal processor, power amplifier, the structure of low noise amplifier The output terminal is connected to the input terminal of the mixer, the output terminal of the mixer is connected to the input terminal of the intermediate frequency amplifier, the output terminal of the intermediate frequency amplifier is connected to the input terminal of the filter, and the output terminal of the filter is connected to the input terminal of the signal processor connected, also including phase-locked loop structures such as figure 2 As shown in the middle dotted line box, the output end of the signal processor is con...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/32G01S7/02
CPCG01S7/02G01S13/32
Inventor 廖怀林王逸潇郝秀成叶乐
Owner PEKING UNIV
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