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High dynamic narrow-band signal frequency tracking method

A narrowband signal and frequency tracking technology, which is applied in the field of communication, can solve the problems of inaccurate tracking, slow positioning of narrowband signals, and low precision, and achieve the effects of accelerating tracking speed, improving tracking accuracy, and reducing residual frequency offset

Active Publication Date: 2017-01-04
GUANGZHOU HAIGE COMM GRP INC
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Problems solved by technology

[0006] The present invention provides a high dynamic narrowband signal frequency tracking method to overcome the deficiencies of the prior art that the positioning of the narrowband signal is slow, the precision is not high, and the tracking is inaccurate under high dynamic conditions.

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Embodiment Construction

[0035] In order to better understand the technical solution proposed by the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] A high dynamic narrowband signal frequency tracking method, such as Figure 1 to Figure 3 As shown, the method is implemented by the following steps:

[0037] 1) performing complex matched filtering on the received digital baseband signal; the center frequency point of the filter used for matched filtering is adjustable according to the determination condition, and is not adjusted initially;

[0038] 2) Timing synchronization and frame synchronization are performed on the filtered signal in step 1);

[0039] 3) using the unique code information in step 2) to perform initial frequency offset estimation, the frequency offset estimation adopts the FFT frequency offset estimation algorithm, and the frequency offset value is compensated to the captured si...

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Abstract

The invention provides a high dynamic narrow-band signal frequency tracking method. The method comprises the following steps: plural matching filtering, bit timing synchronizing, frame synchronizing, and initially frequency deviating; accumulating the acquired frequency deviations, when the accumulated frequency deviation is greater than a preset frequency deviation value, adjusting the central frequency point of the plural matching filters; when the center frequency of the filter after the processing achieves a preset value, enabling a signal after the frequency tracking and compensation to enter a phase-locked loop module to precisely lock the loop. Through the adoption of the method provided by the invention, the demodulation performance of a high dynamic narrow-band signal of a receiver is improved, and the tracking speed and precision are accelerated.

Description

technical field [0001] The invention belongs to the communication field and relates to a frequency tracking method, in particular to a high dynamic narrowband signal frequency tracking method. Background technique [0002] In a satellite communication system, the receiver needs to demodulate the received satellite signal to obtain useful transmission information. When the motion speed of the satellite communication terminal is very slow or zero, the frequency shift and rate of change produced by the Doppler effect are small, and have little impact on the performance of the receiver, which can be solved by using the traditional frequency offset estimation algorithm; but in In the context of high dynamic applications, the Doppler frequency shift and Doppler change rate are large, especially for narrowband signals, which have a greater impact and even lead to deterioration of the receiving performance of the entire system. At this time, a frequency tracking method with fast tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/00H04L7/033G01S19/25
CPCG01S19/254H04L7/033H04L27/0014H04L27/266H04L2027/0026
Inventor 梁中英高心炜
Owner GUANGZHOU HAIGE COMM GRP INC
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