Asynchronous DS-CDMA signal time-frequency difference parameter estimation method

A DS-CDMA and parameter estimation technology, applied in transmission systems, electrical components, etc., can solve problems such as multi-peak ambiguity, achieve the effects of improving accuracy, solving mutual interference, and avoiding multi-peak ambiguity

Active Publication Date: 2021-12-28
SEAS BEIJING INFORMATION TECH CO LTD
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Problems solved by technology

[0007] In order to solve the problem of multi-peak ambiguity in the direct calculation of the mutual ambiguity function of the asynchronous CDMA sign

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  • Asynchronous DS-CDMA signal time-frequency difference parameter estimation method
  • Asynchronous DS-CDMA signal time-frequency difference parameter estimation method
  • Asynchronous DS-CDMA signal time-frequency difference parameter estimation method

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[0060] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION The present invention is described below to understand the present invention, but it should be understood, and the present invention is not limited to the scope of the specific embodiments, and These variations are obvious, and all inventions of the inventive inventions are in the spirit of the invention.

[0061] like figure 1 As shown, the embodiment of the present invention provides an asynchronous DS-CDMA signal time frequency difference parameter estimation method, including steps S1 to S10:

[0062] S1, obtain the carrier frequency and code rate of the asynchronous CDMA signal, perform the lower frequency conversion and mining sample processing on the main star signal to obtain the chip level signal;

[0063] In the present embodiment, it is assumed that the CDMA sampling signal received by the main star is represented as X, which contains four user signals, and the CDMA signal carrier is 2.5MHz, the co...

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Abstract

The invention discloses an asynchronous DS-CDMA signal time-frequency difference parameter estimation method, which comprises the following steps of: firstly, screening code sequences actually used by user signals from a spreading code sequence library, and acquiring an estimation result of the number of CDMA signal users through the number of the screened code sequences; secondly, carrying out asynchronous CDMA signal reconstruction and separation, and calculating mutual ambiguity functions of a primary satellite CDMA signal and an adjacent satellite CDMA signal respectively by using reconstruction signals of each user; and finally, acquiring the real time difference and frequency difference of the users according to the difference between a time-frequency difference estimation result of a primary satellite and a time-frequency difference estimation result of an adjacent satellite. Compared with direct calculation of the mutual ambiguity functions of the primary and adjacent satellite CDMA signals, the problem of mutual interference among multiple users can be effectively solved, and the multi-peak ambiguity phenomenon is avoided; and meanwhile, only the primary satellite CDMA signal needs to be subjected to de-spreading reconstruction, and the accuracy of estimating the de-spreading synchronization position of each user signal of the asynchronous CDMA under the low signal-to-noise ratio can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of passive positioning, in particular to a time-frequency difference parameter estimation method of an asynchronous direct sequence spread spectrum code division multiple access (Direct Sequence-Code Division Multiple Access, DS-CDMA) signal. Background technique [0002] The geosynchronous orbit dual-satellite time-frequency difference positioning technology is a commonly used ground radiation source positioning technology. It realizes the coherent accumulation of signals by calculating the cross ambiguity function (Cross Ambiguity Function, CAF) of the signals received by the main and neighboring satellites, and through the correlation peak The position obtains the time-frequency difference of the two signals, and then establishes the positioning solution equation according to the position of the satellite, and finally determines the target position of the radiation source. [0003] For conventional narrow...

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Application Information

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IPC IPC(8): H04B1/707H04B1/7103
CPCH04B1/70718H04B1/7103Y02D30/70
Inventor 高峰夏畅雄侯素霞
Owner SEAS BEIJING INFORMATION TECH CO LTD
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