Crystalless FMCW Radar Transceiver System and Frequency Calibration Method

Abstract

The invention discloses a crystal-less FMCW radar transceiver system and a frequency calibration method, and relates to the field of wireless transceiver technology. The crystal-free FMCW radar transceiver system realizes the frequency by means of an oscillator with calibration and frequency drift compensation and a radio frequency phase-locked loop. The modulation does not require additional receiving channels to obtain frequency deviations, which can reduce the number of modules involved in calibration, thereby simplifying the calibration process and circuits, and reducing the cost of calibration testing.

Description

technical field [0001] The invention relates to the technical field of wireless transceivers, in particular to a crystal-free FMCW radar transceiver system and a frequency calibration method. Background technique [0002] With the update of process technology, radar has inherent advantages in smart home products with the advantages of strong anti-interference, good installation privacy and no privacy leakage. However, consumer electronics are price-sensitive, and small size and low cost are the keys to the implementation of technical solutions. Omitting the off-chip crystal oscillator can reduce the cost while reducing the chip package size. However, in order to comply with the spectrum emission rules of the European Telecommunications Standardization Association and the Federal Communications Commission of the United States, the FMCW (Frequency Modulated Continuous Wave, Frequency Modulated Continuous Wave) radar transceiver system outputs The accuracy of the frequency is ...

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Problems solved by technology

[0003] In this regard, in related technologies, digital-to-analog converters and voltage-controlled oscillators are used to achieve frequency modulation, and the required frequency accuracy is achieved by adopting temperature drift standards and anti-power supply ripple design, but this structure cannot meet the requirements of frequency modulation continuous wave Radar Chirp Requirements

In addition, oscillators and phase-locked loops are also used to realize frequency modulation, and receivers and digital processing circuits of wireless transceiver systems are used to obtain frequency process deviations. However, during the testing process of this scheme, an external target is required. Frequency signal source, and configure the RF front-end as calibration mode, then continuously adjust the output of the frequency synthesizer, and then use the receiver to search for the signal to obtain the frequency deviation, so the design of the entire calibration system is relatively complicated, which increases the cost of calibration

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