WO2023029393A1 - Détecteur équilibré et radar à ondes entretenues à modulation de fréquence - Google Patents

Détecteur équilibré et radar à ondes entretenues à modulation de fréquence Download PDF

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Publication number
WO2023029393A1
WO2023029393A1 PCT/CN2022/077585 CN2022077585W WO2023029393A1 WO 2023029393 A1 WO2023029393 A1 WO 2023029393A1 CN 2022077585 W CN2022077585 W CN 2022077585W WO 2023029393 A1 WO2023029393 A1 WO 2023029393A1
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WO
WIPO (PCT)
Prior art keywords
coupled
detector
terminal
unit
output
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Application number
PCT/CN2022/077585
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English (en)
Chinese (zh)
Inventor
毛剑豪
朱剑雄
向少卿
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上海禾赛科技有限公司
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Application filed by 上海禾赛科技有限公司 filed Critical 上海禾赛科技有限公司
Publication of WO2023029393A1 publication Critical patent/WO2023029393A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section

Definitions

  • the gain of the TIA is 50K, when a DC current of 100 ⁇ A is input to the TIA, a voltage of 5V will be generated, which will cause the TIA to be in a saturated state all the time, so that the balanced detector cannot output a valid signal.
  • the second terminal of the first detector outputs a first DC component directed to the input terminal of the amplifying unit, and the first terminal of the second detector outputs a second DC component directed to its first terminal,
  • the direction of the first DC component is opposite to that of the second DC component; when the first DC component is greater than the second DC component, the compensation voltage of the DC bypass decreases; when the first DC component When the DC component is smaller than the second DC component, the compensation voltage of the DC bypass increases.
  • the first output terminal of the first differential amplifier is a positive output terminal
  • the second output terminal of the first differential amplifier is a negative output terminal
  • the first input terminal of the first integration unit is The positive input terminal
  • the second input terminal of the first integrating unit is a negative input terminal.
  • the second feedback unit includes a second compensation capacitor and a second feedback resistor, wherein: the first end of the second compensation capacitor is coupled to the first end of the second feedback unit, and its The second terminal is coupled to the second terminal of the second feedback unit; the first terminal of the second feedback resistor is coupled to the first terminal of the second compensation capacitor, and the second terminal is coupled to the first terminal of the second compensation capacitor.
  • the second terminals of the two compensation capacitors are coupled.
  • the buffer circuit further includes: a fourth resistor and a fifth resistor, wherein: the first terminal of the fourth resistor is coupled to the first output terminal of the amplifying unit, and the second terminal of the fourth resistor is coupled to the first output terminal of the amplifying unit.
  • the first input end of the buffer unit is coupled; the fifth resistor, its first end is coupled to the second output end of the amplification unit, and its second end is coupled to the second input end of the buffer unit .
  • the buffer unit includes a second differential amplifier.
  • Fig. 1 is the coherent detection principle diagram of existing a kind of balanced detector
  • Fig. 10 is a schematic structural diagram of a frequency modulation continuous wave radar in an embodiment of the present invention.
  • the signal-to-noise ratio of the output signal of the balanced detector using two-stage TIA is low.
  • the DC bypass can guide the DC component output by the first detector and the DC component output by the second detector, and the DC component can form a loop with the DC bypass, thereby stabilizing the voltage at the input end of the amplifying unit.
  • the first end of the first detector PD1 is connected to the first power supply
  • the second end of the first detector PD1 is coupled to the first end of the second detector PD2
  • the output voltage of the first power supply is V1
  • the second terminal of the second detector PD2 is connected to the second power supply
  • the output voltage of the second power supply is V2.
  • V1-V2 can make the first detector PD1 and the second detector PD2 respectively work in a linear state.
  • the output voltage V1 of the first power supply may be in reverse phase to the output voltage V2 of the second power supply, and the amplitude of V1 is equal to V2.
  • the output voltage V1 of the first power supply can be in reverse phase to the output voltage V2 of the second power supply, but the amplitude of V1 is not equal to that of V2.
  • a first terminal of the first integrating capacitor C11 is coupled to the first input terminal of the first integrating unit 20 , and a second terminal of the first integrating capacitor C11 is grounded.
  • the DC bypass may include a third DC blocking capacitor C23 and a sixth resistor R26, wherein:
  • FIG. 7 shows a schematic structural diagram of another balanced detector in an embodiment of the present invention.
  • the buffer circuit may include a buffer unit 30 , a first feedback unit and a second feedback unit.
  • the buffer unit 30 may be a second differential amplifier.
  • the first input end of the buffer unit 30 is coupled to the first end of the first feedback unit
  • the second input end of the buffer unit 30 is coupled to the first end of the second feedback unit
  • the buffer unit 30 The first output end of the buffer unit 30 is coupled to the second end of the first feedback unit
  • the second output end of the buffer unit 30 is coupled to the second end of the second feedback unit.
  • the first feedback unit may include a first compensation capacitor C31 and a first feedback resistor R31, wherein:
  • FIG. 8 a schematic structural diagram of another balanced detector in an embodiment of the present invention is shown.
  • the first end of the first DC blocking capacitor C21 is coupled to the first output terminal OUT+ of the first differential amplifier 10, and the second end of the first DC blocking capacitor C21 is used as the first output end of the balance detector; the second DC blocking capacitor The first terminal of C22 is coupled to the second output terminal OUT- of the first differential amplifier 10 , and the second terminal of the second DC blocking capacitor C22 is used as the second output terminal of the balanced detector.
  • the mixer 150 may specifically be the coupler in FIG. 1 , the local oscillator light and the echo light are mixed in the coupler to obtain the beat frequency optical signal, and the coupler converts the beat frequency optical signal at a ratio of 50:50
  • the output of the splitting ratio can obtain two beams of light with the same amplitude and opposite phase.
  • the specific structure of the optical balance detector 160 can refer to the optical balance detection provided by the above-mentioned embodiments of the present invention.
  • the two beams of light output by the coupler are respectively received by the first detector PD1 and the second detector PD2, and converted into electrical signals, which are received by the first detector PD1 and the second detector PD2 respectively.
  • the output of the amplification unit will not be described here.
  • the frequency-modulated continuous wave radar is a coaxial radar, that is, the detection light and the echo light can share an optical system (not shown in the figure), and the optical system is, for example, a collimating lens or a lens group.
  • the frequency-modulated continuous wave radar further includes an isolation
  • the device 140 is suitable for isolating the transmitting and receiving optical circuits. After being amplified, the detection light is input from the first port of the isolator 140 and output from the second port, and then emitted after being collimated by the optical system; the echo light reflected by the obstacle is received by the radar, focused by the optical system and then input through the second port The isolator 140.
  • the isolator 140 outputs the echo light from the third port, so as to isolate the echo optical path from the detection optical path.
  • the echo light output from the third port and the local oscillator light output from the optical splitter 120 are input into the mixer 150 to obtain a beat frequency optical signal.

Abstract

Détecteur équilibré et radar à ondes entretenues à modulation de fréquence. Le détecteur équilibré comprend : un premier détecteur (PD1), un second détecteur (PD2), une unité d'amplification (10) et une dérivation de courant continu, une seconde extrémité du premier détecteur (PD1) étant couplée à une première extrémité du second détecteur (PD2) ; une extrémité d'entrée de l'unité d'amplification (10) étant couplée à la seconde extrémité du premier détecteur (PD1) et à la première extrémité du second détecteur (PD2), et étant couplée à la dérivation de courant continu ; la dérivation de courant continu étant conçue pour guider des composantes de courant continu fournies par le premier détecteur (PD1) et le second détecteur (PD2) ; et les composantes de courant continu et la dérivation de courant continu formant une boucle, de manière à stabiliser une tension à l'extrémité d'entrée de l'unité d'amplification (10). Au moyen de la structure ci-dessus, l'effet de composantes à courant continu inégales de différents détecteurs sur un détecteur équilibré peut être empêché, ce qui permet d'améliorer le rapport signal sur bruit d'un signal de sortie du détecteur équilibré.
PCT/CN2022/077585 2021-08-31 2022-02-24 Détecteur équilibré et radar à ondes entretenues à modulation de fréquence WO2023029393A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202111016005.X 2021-08-31
CN202111016005.XA CN115728723A (zh) 2021-08-31 2021-08-31 平衡探测器及调频连续波雷达

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WO2023029393A1 true WO2023029393A1 (fr) 2023-03-09

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CN (1) CN115728723A (fr)
WO (1) WO2023029393A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104539373A (zh) * 2014-12-30 2015-04-22 天津大学 交叉耦合结构的高速cmos单片集成光接收机前端电路
CN105157829A (zh) * 2015-05-15 2015-12-16 山西大学 一种低频平衡零拍光电探测器
US20190257927A1 (en) * 2018-02-16 2019-08-22 Xiaotian Steve Yao Optical sensing based on wavelength division multiplexed (wdm) light at different wavelengths in light detection and ranging lidar systems
CN110779623A (zh) * 2019-11-07 2020-02-11 山西大学 一种集成锁定支路的平衡零拍探测器
CN110806586A (zh) * 2020-01-08 2020-02-18 杭州爱莱达科技有限公司 无扫描线性调频连续波测速测距激光三维成像方法及装置
CN111397858A (zh) * 2020-04-04 2020-07-10 山西大学 一种平衡零拍探测器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104539373A (zh) * 2014-12-30 2015-04-22 天津大学 交叉耦合结构的高速cmos单片集成光接收机前端电路
CN105157829A (zh) * 2015-05-15 2015-12-16 山西大学 一种低频平衡零拍光电探测器
US20190257927A1 (en) * 2018-02-16 2019-08-22 Xiaotian Steve Yao Optical sensing based on wavelength division multiplexed (wdm) light at different wavelengths in light detection and ranging lidar systems
CN110779623A (zh) * 2019-11-07 2020-02-11 山西大学 一种集成锁定支路的平衡零拍探测器
CN110806586A (zh) * 2020-01-08 2020-02-18 杭州爱莱达科技有限公司 无扫描线性调频连续波测速测距激光三维成像方法及装置
CN111397858A (zh) * 2020-04-04 2020-07-10 山西大学 一种平衡零拍探测器

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