Double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias

A technology of DC bias and circuit structure, applied in measuring devices, radio wave measurement systems, radio wave reflection/re-radiation, etc., can solve problems such as wasting signal sources, and achieve the effect of improving utilization and accuracy

Inactive Publication Date: 2019-01-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this structure, two signals of different frequencies need to be generated, one is used as a transmitting signal, and the other is used as a local oscillator signal, which wastes the signal source to a certain extent.

Method used

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  • Double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias
  • Double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias
  • Double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias

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Embodiment

[0040] In the present invention, the models of the components and parts used in the present invention are described as follows. No. 1 local oscillator LO1 and No. 2 local oscillator LO2 all adopt the LTC6948IUFD of Analog Devices Company, and utilize this local oscillator to produce two frequencies of 1.67GHz and 2.06GHz; No. 1 power divider Power Divider1, No. 2 power divider Power Divider2, No. 3 power divider Power Divider3, and No. 4 power divider Power Divider4 all use Anaren's PD0922J5050S2HF; 1.67GHz No. 2 band-pass filter BPF2 and No. 3 band-pass filter BPF3 adopts TriQuint's TQQ7303; 2.06GHz No. 1 band-pass filter BPF1 and No. 4 band-pass filter BPF4 both adopt TriQuint's 856738; 390MHz No. 5 band-pass filter BPF5 and No. 6 band-pass filter BPF6 Both use Qualcomm's B39391B5047Z810; No. 1 low-noise amplifier LNA1 and No. 2 low-noise amplifier LNA2 both use Analog Devices' HMC618ALP3ETR; No. 1 mixer Mixer1 and No. 2 mixer Mixer 2 both use Analog Devices' LT5575EUF; Anal...

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Abstract

The invention discloses a double-frequency continuous wave Doppler radar circuit structure for inhibiting direct-current bias. A receiving antenna is connected with a fourth power divider; one path ofan output end of the fourth power divider is serially connected with a first band-pass filter, a first low-noise amplifier, a first mixer, a fifth band-pass filter and a first analog-to-digital converter, and the other path of the output end of the fourth power divider is serially connected with a second band-pass filter, a second low-noise amplifier, a second mixer, a sixth band-pass filter anda second analog-to-digital converter; the first analog-to-digital converter and the second analog-to-digital converter both are connected to a field-programmable gate array; a transmitting antenna isserially connected with a power amplifier and a second power divider; an input end of the second power divider is connected with a third power divider; a first power divider is connected to a first local oscillator, and one path of an output end of the first power divider is connected to the second power divider, and the other path of the output end of the first power divider is connected to the first mixer via a third band-pass filter; and the third power divider is connected to a second local oscillator, and one path of an output end of the third power divider is connected to the second power divider, and the other path of the output end of the third power divider is connected to the second mixer via the fourth band-pass filter.

Description

technical field [0001] The invention relates to the field of dual-frequency Doppler radar circuits, and more specifically relates to a dual-frequency continuous wave Doppler radar circuit structure for suppressing DC bias. Background technique [0002] Continuous wave Doppler radar is one of the main radar structures to realize the detection of vital signs. Among the many receiver structures of continuous wave Doppler radar, the zero-IF structure is the most commonly used receiver structure. This structure does not have the problem of image frequency interference, and no image suppression filter is needed, so the structure of the radar is simplified. However, the local oscillator frequency of this structure is equal to the frequency of the RF signal, so there will be a DC offset problem after mixing in the receiver, which will seriously affect the accuracy of signal demodulation results, and even limit the application of this structure in the high-precision field applicatio...

Claims

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Application Information

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IPC IPC(8): G01S7/02G01S7/36
CPCG01S7/02G01S7/023G01S7/36G01S7/03G01S7/034G01S7/354G01S7/415G01S13/347G01S13/50G01S13/88
Inventor 马建国杨自凯周绍华杨闯
Owner TIANJIN UNIV
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