A time-to-digital converter for time-of-flight ranging of FM CW radar

A frequency-modulated continuous wave and time-to-digital technology, which is applied in time-to-digital converters, devices for measuring time intervals, and re-radiation of electromagnetic waves, etc. Low circuit power consumption and easy-to-implement effects

Active Publication Date: 2020-10-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] It can be seen from formula (2) that the resolution of traditional frequency difference ranging is mainly affected by the system bandwidth, and for many radar systems, when the transmitted signal is a high-frequency radio frequency signal, the bandwidth is difficult to reach a high index, such that the bandwidth limits the range resolution

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  • A time-to-digital converter for time-of-flight ranging of FM CW radar
  • A time-to-digital converter for time-of-flight ranging of FM CW radar
  • A time-to-digital converter for time-of-flight ranging of FM CW radar

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Embodiment 1

[0063] Applying the time-to-digital converter described in the present invention to the time difference ranging of frequency modulation continuous wave radar can effectively solve the problem that the intermediate frequency difference ranging of traditional frequency modulation continuous wave radar is severely limited by the signal bandwidth; at the same time, the time-to-digital converter Applied in FM continuous wave radar, the distance measurement accuracy can be 1.22cm.

[0064] The system block diagram of the time-to-digital converter is shown as figure 1 As shown, it mainly includes transmission delay matching module, capacitor charging and discharging module, digital logic control module, fully differential analog-to-digital converter ADC and counter;

[0065] Among them, the function of the transmission delay matching module is to reverse and delay the input START signal and STOP signal respectively;

[0066] Among them, the function of the capacitor charging and dis...

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Abstract

The invention relates to a time-to-digital converter for a time difference ranging of frequency-modulated continuous wave radar. The time-to-digital converter is applied to the time difference rangingin the frequency-modulated continuous wave radar and belongs to the technical field of radar ranging and laser ranging. The converter comprises a transmission delay matching module, a capacitor charging and discharging module, a digital logic control module, a fully differential analog-to-digital converter ADC and a counter. The transmission delay matching module is connected with the digital logic control module, the digital logic control module is connected with the capacitor charging and discharging module, the capacitor charging and discharging module is connected with the counter, and the capacitor charging and discharging module is connected with the fully differential analog-to-digital converter ADC. The time-to-digital converter is applied to the time difference ranging of the frequency-modulated continuous wave radar, the problem that the frequency difference ranging in a traditional frequency-modulated continuous wave radar is seriously limited by signal bandwidth can be effectively solved, meanwhile, the time-to-digital converter is applied to the frequency modulation continuous wave radar, and the centimeter-level ranging precision can be achieved.

Description

technical field [0001] The invention relates to a time-to-digital converter for time-difference distance measurement of frequency modulation continuous wave radar. The time-to-digital converter is applied to time difference distance measurement in frequency modulation continuous wave radar, and belongs to the technical field of radar distance measurement and laser distance measurement. Background technique [0002] The traditional FM continuous wave radar transmits a series of FM continuous waves through the antenna of the transmitting end, and receives the echo signal from the target through the antenna of the receiving end, also known as the received signal, and coherently mixes the transmitted signal and the received signal to obtain The intermediate frequency signal contains the distance information of the target, and the distance information of the target is converted into a frequency difference, and then the frequency difference is used for ranging. The traditional FM ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04F10/00G01S17/32G01S13/32G01S7/491G01S7/35
CPCG01S7/352G01S7/4915G01S13/32G01S17/32G04F10/005
Inventor 周波金烨然刘宇杰李尧
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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