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Method for eliminating Doppler effect of spreading code

A technology of Doppler effect and spreading code, which is applied in the field of eliminating the Doppler effect of spreading code, can solve problems such as hardware resource consumption and computational complexity, and achieve reduction of calculation amount and elimination of spreading code Doppler effect. Le effect, the effect of saving ROM and multiplication resource consumption

Active Publication Date: 2019-06-11
南京天际易达通信技术有限公司
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Problems solved by technology

[0005] The technical problem mainly solved by the present invention is a method for eliminating the Doppler effect of the spreading code, which solves the problem of computational complexity and hardware resources caused by the acquisition of the spreading code due to the Doppler effect in the prior art of satellite communication consumption problem

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  • Method for eliminating Doppler effect of spreading code
  • Method for eliminating Doppler effect of spreading code
  • Method for eliminating Doppler effect of spreading code

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Embodiment Construction

[0021] In order to facilitate understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided for the purpose of making the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention are only for the purpose of describing specific embodiments, and are not used to limit the present invention. The term "and / or" used...

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Abstract

The invention discloses a method for eliminating Doppler effect of a spreading code. The method comprises the following steps of performing carrier stripping on the received direct sequence spread spectrum signal by mixing, generating a local spreading code by using a single code NCO for despreading, and then performing discrete Fourier transform, wedge transform, inverse Fourier transform and spectrum analysis in sequence to obtain correlation peaks under different carrier Doppler and code phase conditions. Through the above method, in particular the wedge transform method used therein can effectively reduce the calculation amount, save the consumption of ROM and multiplication resources in the FPGA hardware circuit, and effectively eliminate the Doppler effect of the spreading code.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to a method for eliminating Doppler effect of spreading codes. Background technique [0002] In the satellite measurement and control system, the direct sequence spread spectrum signal is often used to achieve accurate ranging and anti-jamming, and the accurate synchronization of the spread spectrum signal is based on the precise ranging. The satellite is in a high-speed relative motion state relative to the ground TT&C station, resulting in a large Doppler frequency shift in the spread spectrum TT&C signal between the spaceborne transponder and the ground TT&C station, which is specifically manifested in the carrier Doppler frequency offset and Spreading code Doppler effect. [0003] The capture problem of spread spectrum signal is reduced to finding the maximum correlation peak of the receive-local signal through the two-dimensional search of the phase difference of the spr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/23G01S19/21G01R23/16
Inventor 殷君李志强孙健俊曹寿琦
Owner 南京天际易达通信技术有限公司
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