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Transformation method for GNSS digital intermediate frequency signal and signal transformation module

A digital intermediate frequency signal and digital signal technology, applied in the field of satellite navigation signal processing, can solve the problem that the baseband cannot be compatible with various digital intermediate frequency signals, and achieve the effect of saving development resources and avoiding the work of software and hardware

Active Publication Date: 2017-01-11
SHANGHAI CYGNUS SEMICON CO LTD
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Problems solved by technology

[0003] The purpose of the present invention is to provide a conversion method and a signal conversion module of a GNSS digital intermediate frequency signal to solve the problem that the existing baseband cannot be compatible with various digital intermediate frequency signals

Method used

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  • Transformation method for GNSS digital intermediate frequency signal and signal transformation module
  • Transformation method for GNSS digital intermediate frequency signal and signal transformation module
  • Transformation method for GNSS digital intermediate frequency signal and signal transformation module

Examples

Experimental program
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Embodiment

[0070] Take the parameters in Table 1 as an example:

[0071] Table 1

[0072]

[0073] Step 1. Establish a 64-phase NCO lookup table, such as image 3 Shown:

[0074] The 2π phase is divided into 64 equal parts, and the sine value of each phase point is obtained by stepping 64 times from phase 0. The sine value of each point phase is calculated by the following formula:

[0075] n c o _ t a b l e ( k ) = ( 2 N x - 1 - 1 ) × c o s ( 2 π × k 64 ) , k = 0...63.

[0076] Step 2. Realize the mixing operation:

[0077] Such as Figure...

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Abstract

The invention discloses a transformation method for a GNSS digital intermediate frequency signal and a signal transformation module. The transformation method comprises the following steps of step 1.carrying out frequency mixing on an input signal and a signal generated by a digital-controlled oscillator, and shifting a frequency spectrum of an input intermediate frequency and a covered narrow-band noise frequency spectrum to a desired intermediate frequency position of a desired signal of a GNSS baseband to obtain a frequency mixing signal; step 2.generating a digital signal after filtering the frequency mixing signal through a low-pass filter, wherein the intermediate frequency of the digital signal becomes the desired intermediate frequency, and the sampling frequency still remains at an input sampling frequency; step 3.generating a variable sampling signal through extraction or interpolation of the digital signal, wherein the intermediate frequency of the variable sampling signal becomes the desired intermediate frequency, and the sampling frequency still remains at a desired sampling frequency; and step 4,carrying out uniform quantization on the variable sampling signal to generate a final desired signal to solve a problem that the existing baseband cannot be compatible with various digital intermediate frequency signals.

Description

【Technical field】 [0001] The invention belongs to the technical field of satellite navigation signal processing, and in particular relates to a conversion method and a signal conversion module of a GNSS digital intermediate frequency signal. 【Background technique】 [0002] Usually, the baseband input signal of the GNSS receiver is consistent with the radio frequency output signal, that is, the radio frequency and the baseband are bound. Faced with the new digital IF interface, GNSS receiver designers have to plan a new baseband implementation solution. Due to the changes in the front end of the system, a lot of research and development work has been brought, and a lot of development resources have been wasted. 【Content of invention】 [0003] The purpose of the present invention is to provide a conversion method and a signal conversion module of a GNSS digital intermediate frequency signal, so as to solve the problem that the existing baseband cannot be compatible with vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/00H04B1/16G01S19/37
CPCG01S19/37H04B1/0067H04B1/16
Inventor 王大鹏白阳梁大伟薛文通
Owner SHANGHAI CYGNUS SEMICON CO LTD
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