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Frequency locking detector processing method based on cross product algorithm in frequency locking loop

A technology of frequency locking and processing method, applied in the direction of automatic power control, electrical components, etc., can solve the problems of detection performance and realization effect limitations, lack of lock detection methods, etc., to achieve good lock indication performance, stable lock detection performance, Simplify the realization of the effect of the structure sheet

Active Publication Date: 2014-12-24
BEIJING RES INST OF TELEMETRY +1
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Problems solved by technology

[0012] For a system using BPSK modulation, the frequency-locked loop using the arctangent cross-product method can also use the above lock-in detection method, but its detection performance and implementation effect are limited in engineering applications
For frequency-locked loops, especially in frequency-locked loops using the arctangent cross-product algorithm, there is still a lack of effective methods for lock-in detection

Method used

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  • Frequency locking detector processing method based on cross product algorithm in frequency locking loop
  • Frequency locking detector processing method based on cross product algorithm in frequency locking loop
  • Frequency locking detector processing method based on cross product algorithm in frequency locking loop

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Embodiment Construction

[0036] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0037] A kind of frequency locking detector processing method based on cross product algorithm in the frequency locked loop, comprises the following steps:

[0038] (1) Calculate the locking metric value D at the kth moment:

[0039] D = 1 M Σ q = k - M + 1 k z q

[0040] Among them, z q is the qth lock detection component, and Q is the number of lock detection components participating in the accumulation:

[0041] z q = | a tan { I q ...

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Abstract

The invention relates to a frequency locking detector processing method based on a cross product algorithm in a frequency locking loop. The frequency locking detector processing method can be used for detecting the locking state of the frequency locking loop in real time, locking detection components are determined through arc tangent calculation according to the rear part and the virtual part of received signals, the locking detection components are accumulated to obtain the locking detection quantity, the locking detection quantity is compared with a detection judgment threshold, and the locking state of the frequency locking loop is determined. According to the method, the frequency locking detection result is not influenced by modulation signal phases and signal amplitudes, detection performance is stable, and the method can be applied to satellite communication systems adopting BPSK modulation.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a frequency locking detector processing method based on a cross-product algorithm in a frequency-locked loop, which is used for real-time detection of the locking state of the frequency-locked loop. Background technique [0002] In satellite communication systems, especially in the receivers of satellite navigation communication systems such as GPS and Beidou that use spread spectrum BPSK modulation signals, the cross-product automatic frequency control loop (CPAFC) is often used to perform carrier acquisition and synchronization of despread symbol data. track. Frequency-locked loops track the frequency of the carrier in highly dynamic receivers. The frequency discrimination function of the frequency locked loop is mainly completed by detecting the frequency residual of the received signal through the frequency discriminator. There is data bi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099
Inventor 闫朝星周三文刘同领马荣
Owner BEIJING RES INST OF TELEMETRY
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