Light quantum coincidence counting positioning method based on time delay relative error

A technology of relative error and positioning method, which is applied in the measurement distance, line-of-sight measurement, climate sustainability, etc., and can solve the problems of large positioning error, positioning error, and positioning performance degradation.

Pending Publication Date: 2022-07-08
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] However, when light quantum propagates in free space, the quantum state will inevitably be affected by irresistible factors such as atmospheric turbulence, smog, dust and natural environment, and light quantum propagates at the speed of light, and the propagation speed is relatively fast, even if it is very small The

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  • Light quantum coincidence counting positioning method based on time delay relative error
  • Light quantum coincidence counting positioning method based on time delay relative error
  • Light quantum coincidence counting positioning method based on time delay relative error

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[0054] specific implementation

[0055] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0056] Step 1, using a laser to generate pump light with a wavelength of 405 nm, and using a half-wave plate and a polarization beam splitter to obtain linearly polarized light with a horizontal polarization direction;

[0057] Step 2: Modulate the linearly polarized light to 45° linearly polarized light through a half-wave plate to ensure the entanglement degree of the entangled light, and focus it to the PPKTP crystal through a lens to ensure the brightness of the entangled light;

[0058] Step 3: irradiating 45° linearly polarized light to the PPKTP crystal to generate a spontaneous parametric down-conversion process, and the light beam undergoes spontaneous parametric down-conversion with a certain probability to obtain entangled light;

[0059] Step 4: Using a polarization beam splitter to separate the entangled light with a wave...

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Abstract

The invention provides a light quantum coincidence counting positioning method based on a time delay relative error. The method comprises the following steps: firstly, enabling continuous pump light generated by a laser to pass through a half-wave plate and a polarization beam splitter to form linearly polarized light, and irradiating the linearly polarized light to a periodically poled potassium titanyl phosphate (KTP) crystal to generate reference light and signal light; secondly, directly receiving the reference light by a local single-photon detector, transmitting the signal light to a target to be detected, reflecting the signal light to the local, receiving the signal light by another single-photon detector, calculating the photon loss rate of a signal light time pulse sequence in each light source, and performing dynamic grouping; thirdly, coincidence counting is conducted on the time pulse sequence, a second-order correlation function curve of the light is obtained, and a time delay value corresponding to the peak value of the second-order correlation function curve serves as the flight time difference of the signal light and the reference light; and finally, aiming at the time delay value obtained by coincidence counting, calculating the time delay relative error of other groups, and dynamically selecting the light source with smaller time delay relative error for positioning.

Description

technical field [0001] The invention relates to the field of quantum precision measurement, in particular to a reliable light source selection based on time delay relative error, and coincidence counting based on the correlation characteristic of entangled photons to improve the positioning accuracy and positioning robustness of a distance-dependent positioning method. Background technique [0002] Satellite navigation and positioning technology is based on space-based artificial satellites, providing all-weather, 24-hour continuous and uninterrupted high-precision three-dimensional position, speed and time information for various military and civilian carriers in the world's sea, land, air and space. At present, the mature satellite navigation and positioning systems, including the Global Positioning System (GPS) in the United States and the Beidou navigation system in my country, are widely used in traffic navigation, satellite timing, emergency command, and civil water mon...

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Application Information

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IPC IPC(8): G01S17/48G01J11/00
CPCG01S17/48G01J11/00Y02A90/30
Inventor 周牧张靖谢良波杨小龙王勇聂伟
Owner CHONGQING UNIV OF POSTS & TELECOMM
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