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Ranging method for real-time compensation of common link air refractive index

A technology of real-time compensation and ranging method, which can be used in measurement devices, re-radiation, radio wave measurement systems, etc., and can solve problems such as the inability to achieve air refractive index compensation.

Inactive Publication Date: 2019-07-26
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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Problems solved by technology

The existing methods for measuring the refractive index of air and compensating for ranging accuracy are mainly direct methods. The direct method obtains the measured air refractive index value by arranging a certain number of sensors, and compensates the ranging results after averaging calculations. Although it can be achieved by Arrange more measurement points to improve the air refractive index measurement accuracy, but it is still unable to realize the air refractive index compensation of the whole path

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  • Ranging method for real-time compensation of common link air refractive index
  • Ranging method for real-time compensation of common link air refractive index
  • Ranging method for real-time compensation of common link air refractive index

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Embodiment Construction

[0040] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention with this.

[0041] The existing method of measuring the refractive index of air and compensating the distance measurement accuracy is mainly the direct method, that is, using the classic Edlin calculation formula, by measuring the temperature, humidity, pressure, carbon dioxide and other parameters on the laser propagation path, by using the formula 1, 2, 3, 4 get the refractive index n, so as to compensate the ranging result;

[0042]

[0043]

[0044] no tpf -n tp =-f(3.7345-0.0401σ 2 )×10 -8 (3)

[00...

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Abstract

The invention discloses a ranging method for real-time compensation of a common link air refractive index. The ranging method comprises the steps that femtosecond pulse fundamental frequency light isgenerated by a femtosecond optical frequency comb and transmitted to a frequency doubling unit, and thus frequency doubling light is generated through the frequency doubling unit; the fundamental frequency light is divided by a beam splitter into two paths of light beams which enter a reference light path and a measurement light path correspondingly, and the frequency doubling light is divided bythe beam splitter into two paths of light beams which enter the reference light path and the measurement light path correspondingly; the repetition frequency of the femtosecond optical frequency combis adjusted, the fundamental frequency light and the frequency doubling light obtain a first rough measuring distance and a second rough measuring distance through a time-of-flight method correspondingly, and the fundamental frequency light and the frequency doubling light obtain first accurate measuring distance and a second accurate measuring distance through an interference method correspondingly; and dispersion scale factors of the fundamental frequency light and the frequency doubling light are calculated, and the compensation distance of air refractive index compensation is calculated and obtained according to the first accurate measuring distance and the second accurate measuring distance. According to the ranging method, the influence of the air refractive index on the ranging precision is solved by measuring the optical distance corresponding to the two wavelengths.

Description

technical field [0001] The present invention relates to the technical field of femtosecond optical frequency combs, in particular to a real-time compensation ranging method for common-link air refractive index. Background technique [0002] As a cutting-edge technology, femtosecond optical frequency comb can be directly traced to the time reference, so its application in the field of distance measurement has excellent development prospects, and has the advantages of high measurement accuracy and long measurement distance. [0003] In practical applications, the ranging accuracy of the femtosecond optical frequency comb will be affected by the refractive index of the air in the use environment, and the air refractive index will change the propagation speed of the femtosecond optical frequency comb. The existing methods for measuring the refractive index of air and compensating for ranging accuracy are mainly direct methods. The direct method obtains the measured air refractiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/12
CPCG01S11/12
Inventor 刘晓旭谢阳张铁犁张修建靳硕王兵高翌春张鹏程葛萌
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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