Method and system for improving positional accuracy of Beidou navigation system

A navigation system and positioning accuracy technology, which is applied in the field of satellite positioning and navigation, can solve the problems that the Beidou satellite navigation system is difficult to meet the requirements of high-precision positioning, and achieve the effects of improving clock synchronization accuracy, positioning accuracy, and positioning

Inactive Publication Date: 2013-03-06
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the Beidou satellite navigation system is difficult to meet the requirements of precision guidance and other aspects of national defense and security for high-precision positioning

Method used

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  • Method and system for improving positional accuracy of Beidou navigation system
  • Method and system for improving positional accuracy of Beidou navigation system
  • Method and system for improving positional accuracy of Beidou navigation system

Examples

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Embodiment 1

[0050] At one of the ground stations of the Beidou Navigation Satellite System, a semiconductor laser with an ultraviolet wavelength of 405 nanometers is used to irradiate a type of phase-matched BBO crystal, and some photons with a wavelength of 405 nanometers in the BBO crystal will pass through the process of spontaneous parametric down-conversion, and the next Converted to two infrared photons with a wavelength of 810 nanometers, these two photons are usually called signal photon and idler photon. One of the two photons is sent to the Beidou navigation satellite, and the timer on the navigation satellite records the arrival time of the photon. A timer in the ground station records the arrival time of another photon left in the ground station, which passes through the optical retarder and is emitted to an input port of a Hung-Zu-Mandel interferometer housed in the ground station. And the photons reflected from the navigation satellite are incident on another input port of t...

Embodiment 2

[0052] see Figure 7 , at one of the ground stations of the Beidou navigation satellite system, the infrared light with a wavelength of 810 nanometers is first frequency-multiplied by BBO crystals to make it into 405-nanometer ultraviolet light, and then the ultraviolet light device is used to irradiate the phase-matching period of the second type Polar KTP crystals, from which entangled photon pairs are generated. Other steps are similar to those in Embodiment 1, and the synchronization of the ground station clock and the navigation satellite clock can also be realized.

Embodiment 3

[0054] Others are as in embodiment 1, only two entangled photons are sent to two navigation satellites respectively, and similar steps are taken to realize clock synchronization between the two navigation satellites, as Figure 8 shown.

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Abstract

The invention relates to a method and a system for improving the positional accuracy of a Beidou navigation system by using photon pairs with a quantum entanglement feature. The method includes following steps: 1), producing the photon pairs with the quantum entanglement feature; 2), respectively sending the photon pairs with the quantum entanglement feature produced in step 1) to a first clock and a second clock in need of clock synchronization and recording the time from photons to the first clock and the second clock; 3), enabling two photons to pass through a beam splitter, and acquiring the time from the photons to the beam splitter; 4), acquiring a timing difference of the first clock and the second clock; and 5), adjusting the timing difference of one of the clocks according to the acquired timing difference of the two clocks so as synchronizing the two clocks. By the aid of the method and the system, the positional accuracy of the Beidou navigation system is evidently improved.

Description

technical field [0001] The invention belongs to the technical field of satellite positioning and navigation, and relates to a method for improving the positioning accuracy of the Beidou satellite navigation system, in particular to a method and system for improving the positioning accuracy of the existing Beidou satellite navigation system by using photon pairs with quantum entanglement characteristics. Background technique [0002] The BeiDou (COMPASS) Navigation Satellite System (BeiDou (COMPASS) Navigation Satellite System) is a global satellite navigation system that is independently developed and operated independently in my country. The Beidou satellite navigation system consists of three parts: the space segment, the ground segment and the user segment. The space segment includes 5 geostationary orbit satellites and 30 non-geostationary orbit satellites. The ground segment includes several ground stations such as the main control station, the injection station and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/42
Inventor 张同意赵卫
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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