Positioning signal filtering method and apparatus and device
A positioning signal and signal conversion technology, applied in the field of communication, can solve the problems of incomplete removal of residual carrier, large positioning result error, and large phase difference between the signal and the positioning signal, etc.
Active Publication Date: 2018-08-24
BEIJING UNIV OF POSTS & TELECOMM
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[0003] However, in practical applications, because the indoor environment is blocked by buildings, the signal strength of the positioning signal in the indoor environment is seriously attenuated compared with the signal strength in the outdoor environment.
The weak strength of the positioning signal will cause that when the carrier loop in the positioning receiver filters the positioning signal, the phase difference between the filtered signal and the positioning signal is large, and the residual carrier cannot be completely removed. big error
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[0084] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0085] The executor of the embodiments of the present invention may be a positioning receiver, and of course may also be other devices capable of receiving positioning signals and implementing positioning, which is not limited in this application.
[0086] The positioning signal filtering method provided by the embodiment of the present invention will be described below with reference to specific embodiments by taking the positioning receiver as an example.
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Embodiments of the invention provide a positioning signal filtering method and apparatus and also a device. The method includes the following steps: receiving a positioning signal; conducting signal conversion on the positioning signal to obtain continuous N coherent integral results, N being a positive integer; based on the obtained coherent integral results and the preset maximum likelihood discrimination algorithm, estimating an iterative algorithm through parameters, and calculating the residual carrier frequency and phase of the positioning signal; smoothing the residual carrier frequencyand phase according to a preset Kalman filter model; and filtering the positioning signal according to the residual carrier frequency and phase obtained after the smoothing process. The technical scheme provided by the embodiments of the invention can provide positioning accuracy in an indoor environment.
Description
technical field [0001] The present invention relates to the field of communication technology, in particular to a positioning signal filtering method, device and equipment. Background technique [0002] In recent years, precise indoor positioning services have attracted more and more attention. In the prior art, during the positioning process of the positioning receiver based on the received positioning signal, since there will be residual carrier in the positioning signal, it is generally necessary for the carrier loop in the positioning receiver to filter the received positioning signal. In addition to the residual carrier, in order to ensure accurate positioning when the filtered signal is used for positioning, when the positioning signal is filtered, it is also necessary to ensure that the phase of the filtered signal is consistent with the positioning signal. [0003] However, in practical applications, since the indoor environment is blocked by buildings, the signal s...
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IPC IPC(8): G01S19/29G01S19/30
Inventor 邓中亮边新梅刘雯莫君贾步云姜海君范时伟杨寅唐宗山
Owner BEIJING UNIV OF POSTS & TELECOMM