Signal capturing method and signal capturing device
A signal capture and signal technology, applied in the computer field, can solve problems such as secondary peak mislocking, affecting positioning accuracy, etc.
Inactive Publication Date: 2013-12-11
BEIJING UNIV OF POSTS & TELECOMM
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[0003] BOC modulation achieves the spectrum separation of signals at the same frequency by adjusting the rate of subcarriers and spreading codes. Although it improves the spectrum utilization and the anti-interference ability of the signal, its autocorrelation function has multi-peak characteristics, which leads to the signal acquisition process. The secondary peak is wrongly locked (that is, it is locked at the position of the secondary peak, while the correct position is the main peak), and the positioning operation using the secondary peak will affect the positioning accuracy
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] like figure 1 As shown, an embodiment of the present invention provides a signal acquisition method, which may include:
[0026] 110. Acquire satellite signals.
[0027] For example, the satellite signal may be a digital intermediate frequency signal obtained by processing (down-conversion, analog-to-digital conversion) the satellite transmission signal through a radio frequency module.
[0028] 120. Mix the satellite signal and the local reproduced signal to obtain a mixed frequency signal.
[0029] 130. According to the mixed frequency signal and locally generated binary offset carrier modulation (English full name is Binary Offset Carrier, referred to as BOC) signal and PRN (English full name is Pseudo Random Noise code, Chinese tran...
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The invention discloses a signal capturing method and a signal capturing device. Secondary peak error locking can be reduced in the signal capturing process so as to improve the positioning precision. The signal capturing method includes the steps that a satellite signal is obtained; mixing is performed on the satellite signal and a local recurrent signal so as to obtain a mixing signal; a first processing signal is obtained according to the mixing signal and a locally generated binary system biasing carrier modulation (BOC) signal; the first processing signal is processed, and a stronger main peak value is obtained; when the main peak value is larger than a preset value, the satellite signal is successfully captured. Thus, the highest peak value is more outstanding, the probability that the main peak has the highest peak value is increased, secondary peak error locking in the signal capturing process is reduced, and the positioning precision can be improved.
Description
technical field [0001] The invention relates to the field of computers, in particular to a signal capturing method and device. Background technique [0002] Satellite navigation systems widely use binary offset carrier (English full name is Binary Offset Carrier, referred to as BOC) modulation to improve the anti-noise and anti-interference ability of the signal. [0003] BOC modulation achieves the spectrum separation of signals at the same frequency by adjusting the rate of subcarriers and spreading codes. Although it improves the spectrum utilization and the anti-interference ability of the signal, its autocorrelation function has multi-peak characteristics, which leads to the signal acquisition process. The auxiliary peak is locked incorrectly (that is, it is locked at the position of the auxiliary peak, while the correct position is the main peak), and the positioning operation using the auxiliary peak will affect the positioning accuracy. [0004] Therefore, how to re...
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Inventor 邓中亮杨磊尹露席岳王冠一
Owner BEIJING UNIV OF POSTS & TELECOMM