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X-ray circularly polarized ranging method

A distance measurement method, X-ray technology, applied in the field of aviation applications, can solve problems such as distance measurement error and limited laser propagation distance

Active Publication Date: 2014-12-24
XIDIAN UNIV
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Problems solved by technology

However, due to the limitation of the energy of the laser beam and the limitation of energy attenuation, the propagation distance of the laser is limited
In addition, the laser is used as a medium to transmit the ranging signal using light intensity modulation, and the laser intensity is easily interfered by the background noise in the free space during the propagation process, resulting in ranging errors

Method used

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  • X-ray circularly polarized ranging method

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Embodiment Construction

[0102] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides detailed implementation methods and implementation steps, but is not limited to the embodiment.

[0103] refer to figure 1 As shown, a schematic diagram of the implementation process of X-ray polarization ranging, the method includes the following steps:

[0104] Step 1, generating a ranging code: the generated ranging code here can use the T4B pseudo-random code (PN code) suggested by CCSDS (the Consultative Committee for Space Data Systems).

[0105]Step 2, modulate the ranging code based on the circular polarization modulation scheme of the Stokes vector, and modulate the ranging code onto the X-ray circularly polarized signal:

[0106] The polarization of electromagnetic waves characterizes the time-varying characteristics of the orientation of the electric field intensity vector...

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Abstract

The invention discloses an X-ray circularly polarized ranging method. The method includes: modulating ranging signals by utilizing the circularly polarized modulation technology, and adopting Stokes vectors and a Mueller matrix to perform mathematical modeling on polarized signals in each stage in the ranging process; describing changing of the polarization state in the processes of modulation and demodulation on the basis of a signal model, and further explaining detection of left-handed circularly polarized light and right-handed circularly polarized light and the principle of differential demodulation for noise suppression; restoring ranging codes at a receiving station, and reducing background noise and increasing the signal to noise ratio by taking the measure of regenerating ranging codes. X-rays have characteristics of high energy, low propagation loss and high directivity, thereby being suitable for ranging in free space; the circularly polarized modulation technology has higher anti-interference performance, thereby being suitable for information transmission in the free space under harsh conditions.

Description

technical field [0001] The invention relates to a ranging method in the aviation application field, in particular to an X-ray circular polarization ranging method. Background technique [0002] As one of the key technologies in deep space exploration activities, ranging technology is widely used in navigation, relative positioning, orbit determination, and satellite constellation configuration. With the development of deep space exploration activities, conventional ranging technology cannot meet the growing detection needs due to its defects. [0003] The measurement of the distance is generally by measuring the two-way propagation time of the ranging signal between two targets to be measured, and then converting it into a distance. Early ranging used radio frequency (RF) as the medium to carry the ranging signal. Radio frequency ranging is widely used in both near-Earth and deep-space exploration. However, the size of the device required by this method is relatively larg...

Claims

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Application Information

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IPC IPC(8): G01S11/12
CPCG01S11/125
Inventor 许录平宋诗斌张华孙景荣张航阎博申洋赫简阅吴超金正灿
Owner XIDIAN UNIV
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