Frequency tracking method of discontinuous carrier phase signals

A carrier phase and frequency tracking technology, which is applied to the shaping network, electrical components, transmission system and other directions in the transmitter/receiver. It can solve the problems of inability to track the carrier phase, discontinuous signal frequency, etc. The effect of tracking accuracy

Active Publication Date: 2012-03-28
10TH RES INST OF CETC
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Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies of the existing technology, to provide a method that can track the carrier phase discontinuous signal frequency in real time, without relying on the iden

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  • Frequency tracking method of discontinuous carrier phase signals
  • Frequency tracking method of discontinuous carrier phase signals
  • Frequency tracking method of discontinuous carrier phase signals

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Embodiment Construction

[0011] refer to figure 1 . In the uncertain range of Doppler frequency offset, the Doppler frequency of the receiver can be divided into multiple groups of frequency bins with equal intervals or non-equal intervals; the division of frequency bins is based on the Doppler dynamic range of the signal, and the signal frequency The accuracy requirements for tracking, while considering the complexity of the circuit and digital chip resources, can generally be divided into 3 to 10 frequency slots. The setting of the frequency slot can adapt to different dynamic tracking. If the signal Doppler dynamic is low and high frequency tracking accuracy is required, the frequency slot can be divided more finely; if the signal Doppler dynamic is high, the frequency slot should be set wider; The frequency slots near the center slot can be divided finely, and the frequency slots far away from the center slot can be divided wider, which can not only meet the tracking accuracy but also take into a...

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Abstract

The invention provides a frequency tracking method of discontinuous carrier phase signals and aims to provide a method for realizing frequency synchronization without depending on identification for phase change rates. The method is implemented through the technical scheme: within an uncertain range of Doppler frequency offset, a plurality of groups of frequency slots are obtained by division at equal intervals or unequal intervals; a numerical control oscillator corresponding to each frequency slot of a receiver generates a sine signal and a cosine signal; the local sine signal and the local cosine signal of the receiver demodulate an input digital intermediate frequency signal subjected to AD (analog-to-digital) conversion respectively; an integral value of each frequency slot is acquired through a de-spreading module; a frequency difference is identified according to the integral values of the plurality of frequency slots; the frequency difference is processed by a loop filter, so a frequency control word is obtained; the frequency control word is directly sent to a main slot numerical control oscillator to generate a main slot local signal; the frequency control word is added with a branch slot value to acquire a branch slot frequency control word; the branch slot frequency control words Fcw are sent to branch slot numerical control oscillators to generate branch slot local signals; and therefore, a frequency tracking closed loop for a carrier phase discontinuous system is formed.

Description

technical field [0001] The invention relates to a method for frequency tracking of discontinuous carrier phase signals, which is mainly used in a direct-sequence frequency-hopping hybrid spread-spectrum system with a wide signal frequency band. Background technique [0002] The direct-sequence frequency hopping mixed spread spectrum system, especially when the signal bandwidth is very wide, firstly, the analog circuit needs a certain stabilization time, and secondly, the signal with a wide frequency hopping bandwidth needs to be composed of multiple DDS, which will cause the carrier phase between each hop of discontinuity. The existing carrier tracking loop technology relies on identifying the phase change rate to achieve frequency synchronization. Its frequency discriminator calculates the phase change rate within △t time through the integral value of I branch and Q branch. When the signal phase is discontinuous , the wrong frequency value will be obtained through the exis...

Claims

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Application Information

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IPC IPC(8): H04B1/713H04L25/03
Inventor 刘文焘舒炳江蒋宇志
Owner 10TH RES INST OF CETC
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