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Satellite signal acquisition method and device

A satellite signal acquisition and satellite signal technology, applied in satellite radio beacon positioning systems, measurement devices, instruments, etc., can solve the problems of reduced acquisition sensitivity, low-intensity signals, and inability to acquire, and achieves increased coherent integration time, improved Sensitivity, the effect of increasing the gain effect

Active Publication Date: 2016-08-10
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The disadvantages of the above-mentioned PMF+FFT signal capture method are: it can only be applied to the signal capture of the first type of signal pseudocode in a single period, and the gain effect on satellite signals is not good, and it cannot capture lower-intensity signals, which reduces the capture sensitivity

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  • Satellite signal acquisition method and device
  • Satellite signal acquisition method and device

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Embodiment 1

[0052] like figure 1 As shown, it is a flow chart of the satellite signal acquisition method provided by the embodiment of the present invention, and the method includes:

[0053] S110, perform down-sampling processing on the first-type signal pseudo-codes of N periods in the received transmission signal, and obtain the second-type signal pseudo-code with the same number of chips as the local pseudo-code; wherein, one first The Pseudo-codes of the first-class signal uniquely correspond to L pseudo-codes of the second-type signal, and L is the number of chips of the local Pseudo-code.

[0054] Specifically, the transmission signal includes N periods of pseudo-codes of the first type of signal, where N is a natural number. Assuming N=3, then the pseudo code of the first type signal of 3 cycles can be "000", "010" or "110", etc., "1" and "0" respectively represent the waveform of the transmission signal with opposite phase, define "1" is forward, "0" is reverse.

[0055] Furth...

Embodiment 2

[0107] like figure 2 As mentioned above, it is a schematic structural diagram of a satellite signal acquisition device provided by an embodiment of the present invention, which is used to perform the above-mentioned figure 1 The method shown, which includes:

[0108] The down-sampling module 210 is used to perform down-sampling processing on the first-type signal pseudo-codes of N periods in the received transmission signal, so as to obtain the second-type signal pseudo-codes with the same number of chips as the local pseudo-codes; Wherein, a pseudo-code of a first-type signal uniquely corresponds to L pseudo-codes of a second-type signal, and L is the chip number of a local pseudo-code;

[0109] Segmentation module 220, for dividing the second type signal pseudo-code and local pseudo-code in each period into P segmented signal pseudo-codes on average;

[0110] The first accumulated value generating module 230 is used to perform coherent accumulation in the segment where th...

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Abstract

The invention provides a satellite signal acquisition method and device. The method includes the following steps that: down sampling processing is performed on the signal pseudo codes of transmission signals of N cycles, so that second type signal pseudo codes can be obtained; the second type signal pseudo codes and local pseudo codes in each cycle are evenly divided into P segments of signal pseudo codes respectively; coherent accumulation is performed on the second type signal pseudo codes in each segment of signal pseudo codes in each cycle under corresponding segments respectively; the number of the times of initial bit jump in a previous cycle in adjacent cycles is obtained; the number of the times of final bit jump in each cycle is obtained; the second accumulated value of the P segments is obtained according to the number of the times of final bit jump in each cycle; and fast Fourier transformation is performed on the second accumulated value of the P segments, and satellite signals are acquired according to a local acquisition threshold value. The satellite signal acquisition method and device provided by the embodiments of the invention is suitable for the acquisition of satellite signals of a plurality of cycles, and time for coherent integration can be increased, and satellite signals with lower intensity can be acquired, and the sensitivity of signal acquisition can be improved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a satellite signal acquisition method and device. Background technique [0002] In order to ensure the normal transmission of satellite signals, satellites usually use a code that has nothing to do with the satellite signal to be transmitted (this is a spread code) to perform spread spectrum modulation on the satellite signal before transmitting the signal, and then perform BOC (Binary Offset Carrier, binary Carrier offset) modulation, the form of the obtained transmission signal (defining the transmission signal as the satellite signal after BOC modulation) is a signal pseudocode, and the signal pseudocode uses "1" and "0" to represent the transmission signals with opposite phases respectively Waveform, each "1" or "0" represents a chip, and the length of each chip (defining this type of chip as the first type of signal pseudocode) represents the period of the chi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30
CPCG01S19/30
Inventor 邓中亮胡恩文尹露席岳朱棣
Owner BEIJING UNIV OF POSTS & TELECOMM
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