Non-ambiguity capturing method and device applicable to BOC (n, n) signals
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A capture device and non-ambiguous technology, applied in the field of satellite navigation and positioning, can solve problems such as signal capture ambiguity, achieve the effects of saving computation, improving capture sensitivity, and wide applicability
Inactive Publication Date: 2018-06-22
GUILIN UNIV OF ELECTRONIC TECH
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[0003] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of ambiguity-free acquisition method and device applicable to BOC (n, n) signal, to solve binary offset carrier (BOC) modulation technique in the prior art The autocorrelation function has multiple sub-peaks, which causes the problem of ambiguity in signal capture
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Embodiment 1
[0047] see figure 1 , the present invention proposes an ambiguity-free acquisition method suitable for BOC(n,n) signals, using the idea of splitting and reconstruction, splitting the local BOC signal into two unit branch signals, odd and even, for the two branch Reconstruct the cross-correlation function between the channel signal and the received BOC signal.
[0048] Taking the BOC(n,n) modulated signal as an example, the specific implementation plan is as follows:
[0049] Step 1: The received satellite BOC signal is down-converted into an intermediate frequency signal by the down-conversion module, and then the intermediate frequency signal is converted into a discrete-time digital intermediate frequency BOC signal through an analog-to-digital (A / D) converter, denoted as S (l) (t) (wherein l=1,2,..., M is the number of times of mobile code phase), respectively adopts the method of quadrature demodulation to mix the digital intermediate frequency BOC signal with the local...
Embodiment 2
[0100] This embodiment also provides an ambiguity-free capture device applicable to BOC(n,n) signals, the capture device includes:
[0101] Signal acquisition module, suitable for acquiring discrete time digital intermediate frequency BOC signal S (l) (t), wherein l is the number of times of moving the code phase, adopts the method for quadrature demodulation to mix the digital intermediate frequency BOC signal with the local carrier frequency simultaneously, obtains in-phase I (l) and quadrature Q (l) Two signals.
[0102] In this embodiment, the signal acquisition module includes: a receiving module, adapted to receive a satellite BOC signal; a frequency down conversion module, which converts the BOC signal to generate an intermediate frequency signal; an analog-to-digital converter, which converts the intermediate frequency signal into Discrete-time digital intermediate frequency BOC signal; signal stripping module, suitable for using quadrature demodulation method to mix...
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Abstract
The invention provides a non-ambiguity capturing method and device applicable to BOC (n, n) signals which comprises the following steps of: acquiring a digital intermediate frequency signal, mixing the digital intermediate frequency signal with a local carrier to obtain a spread spectrum signal; and performing a low-pass filter on the spread spectrum signal; extracting sampling into a segmented matched filter, wherein both the local code and the spread spectrum signal are divided into a plurality of segments, and the corresponding segment number is multiplied by two times to obtain a pluralityof points, and finally the accumulated value of the cached suitable points is FFT; comparing the obtained maximum value with the threshold, if it is greater than the threshold value, indicating thatthe signal acquisition is successful, entering into the next step of tracking; if it is less than the threshold,, indicating that the signal acquisition is not successful, feedback to extract again, and the mobile code phase is subjected to one-step serial matched filtering plus FFT operation until the acquisition is successful. The invention solves the problem that the self-correlation function of the binary offset carrier modulation technique in the prior art with a plurality of sub-peaks which in turn leads to ambiguity in signal acquisition.
Description
technical field [0001] The invention belongs to the technical field of satellite navigation and positioning, and in particular relates to an ambiguity-free acquisition method and device applicable to BOC (n, n) signals. Background technique [0002] At present, in order to make full use of the frequency band resources and enhance the anti-interference ability, the major satellite navigation systems in the world have proposed a new modulation method---binary offset carrier (BOC) modulation. Compared with BPSK modulation, the advantages of BOC modulation are mainly two aspects: First, BOC modulation first pre-modulates pseudo-random codes with square wave subcarriers, so that the signal spectrum is symmetrically split at the edge of the frequency band, and the separation distance varies with the modulation order. It changes with the change, making full use of the limited spectrum resources and reducing the interference between signals; second, its autocorrelation function has ...
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