Stable tracking method and tracking device after fast capture of code loop
A post-stabilization and code loop technology, applied in the field of code loop fast capture post-stabilization tracking method and tracking device, can solve the problems of large data processing, complex structure, poor practicability, etc.
Active Publication Date: 2020-10-27
西安宇飞电子技术有限公司
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Problems solved by technology
The advantage of this method is that the capture is very fast. In the case of no prior information, the signal capture can be realized with only one code length period. The disadvantage is that the data processing volume is large and the hardware implementation is complicated.
There are many digital filter methods, generally using a second-order FLL (Frequency Locked Loop) to assist a third-order PLL (Phase Locked Loop, phase-locked loop or phase-locked loop) filter, which has a complex structure, many parameters, and poor practicability
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[0068] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0069] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms, such as those defined in commonly used dictionaries, should be understood to have meanings consistent with the meanings in the co...
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The invention relates to the technical field of communications, and especially relates to a stable tracking method and a tracking device after fast capture of a code loop. The method comprises the following steps: performing threshold comparison on received direct sequence spread spectrum signals, screening out a direct sequence spread spectrum signal that meets a preset capture power threshold, and tracking and marking the screened-out direct sequence spread spectrum signal as a tracking signal; performing early local reference code correlation processing, late local reference code correlation processing and current local reference code correlation processing on the tracking signal respectively; comparing a current code correlation parameter with a preset current code correlation parameter threshold, until the current code correlation parameter is larger than or equal to the preset current code correlation parameter threshold, and the current code correlation parameter is synchronizedwith a transmitting end code; and performing code ring adjustment parameter calculation processing on the early code correlation parameter and the late code correlation parameter to obtain the direction and step size of the code ring adjustment, and adjusting a code ring until the code ring is synchronized with the transmitting end code. The stable tracking method after the fast capture of the code loop provided by the invention has the advantages of being stable in performance and simple in structure.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a method and a tracking device for stable tracking after fast acquisition of a code loop. Background technique [0002] The spread spectrum code plays a very important role in the spread spectrum communication. It is used to expand the signal spectrum at the transmitter, and the receiver uses it to compress the signal spectrum and broaden the spectrum of the interference signal, thereby improving the anti-interference of the system. performance. In spread spectrum communication, the system's anti-interference, anti-noise, anti-fading, anti-interception, information concealment and secrecy, multiple access communication, and the realization of capture and tracking are closely related to the performance of the spread spectrum code. Generally, there are the following requirements: (1) must have a sharp autocorrelation function, and the value of the cross-correlation function...
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IPC IPC(8): H04B1/7085H04B1/7073
CPCH04B1/7073H04B1/7085
Inventor 熊军严锋斌王冠孙长红
Owner 西安宇飞电子技术有限公司