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cpfsk signal carrier frequency capture method

A CPFSK and frequency acquisition technology, applied in the direction of FM carrier system, etc., can solve the problems of performance limitation and limited Doppler range

Active Publication Date: 2020-07-17
10TH RES INST OF CETC
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  • Abstract
  • Description
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Problems solved by technology

These carrier frequency tracking methods have one thing in common: the Doppler range that can be tracked is limited, and to a certain extent, it is mutually limited with the tracking performance

Method used

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  • cpfsk signal carrier frequency capture method
  • cpfsk signal carrier frequency capture method
  • cpfsk signal carrier frequency capture method

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Embodiment Construction

[0013] The invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] refer to figure 1 . According to the present invention, a down-converter 1, a resampling unit 2, a spectrum adjustment unit 3, a frequency estimation unit 4 and a Doppler calculation unit 5 that are serially connected in series are used to form a CPFSK signal receiver system; the digital intermediate frequency signal passes through the down-converter 1 Send into resampling unit 2 after processing, and resampling unit 2 carries out random down-sampling to the CPFSK signal that receives; Spectrum adjustment unit 3 changes the spectrum characteristic of CPFSK signal; The Doppler calculation unit 5 uses the frequency values ​​of the two frequency points to calculate the Doppler estimation result to complete the capture of the carrier frequency.

[0015] CPFSK signal carrier frequency acquisition method, concrete steps include:

[0016] 1. Arbitrary downsa...

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Abstract

The invention discloses a CPFSK signal carrier frequency capture method and aims at providing a capture method for performing accurate estimation on the carrier frequency of a CPFSK signal. The invention is implemented by the following technical scheme: forming a CPFSK signal receiver frequency capture system by using a down-converter (1), a re-sampling unit (2), a spectrum adjustment unit (3), afrequency estimation unit (4) and a Doppler calculation unit (5), which are connected in series; sending a digital variable frequency signal to the re-sampling unit (2) after processing the same through the down-converter (1), and performing any ratio-down sampling on the received CPFSK signal by the re-sampling unit (2); changing the spectral characteristics of the CPFSK signal by the spectrum adjustment unit (3); and estimating two frequency points of the CPFSK signal subjected to the frequency spectrum adjustment by the frequency estimation unit (4); and calculating a Doppler estimation result by the Doppler calculation unit (5) by using the frequency values of the two frequency points so as to complete the carrier frequency capture.

Description

technical field [0001] The invention relates to a frequency acquisition technology in the field of wireless communication, in particular to a method for acquiring the carrier frequency of a continuous phase frequency shift keying (ContinuousPhraseFrequencyShiftKey, CPFSK) signal in a wideband digital receiver. Background technique [0002] Continuous Phase Frequency Shift Keying (CPFSK) modulation is a modulation method with a constant envelope, which is a special case of Continuous Phase Modulation (CPM). The modulated signal it produces has the characteristics of continuous phase and constant envelope, high frequency band utilization, fast out-of-band attenuation, constant envelope, concentrated spectrum main lobe energy, and fast side lobe roll-off attenuation. It has been very popular in modern communications. Wide range of applications. [0003] The CPFSK signal belongs to nonlinear modulation and has memory characteristics. The traditional CPM signal is usually demodu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/14H04L27/16
CPCH04L27/14H04L27/16
Inventor 马松张毅余湋李婷
Owner 10TH RES INST OF CETC
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