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Fast capturing method for GNSS code

A fast, long-code technology, applied in the field of fast acquisition of satellite signals, can solve the problems of a large amount of computing time and hardware resources, and achieve the effect of reducing search time and avoiding 3dB loss

Inactive Publication Date: 2014-02-26
JIAXING MICROELECTRONICS & SYST ENG CENT CHINESE ACADEMY OF SCI
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  • Claims
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Problems solved by technology

However, when the C / A signal does not exist or cannot be assisted in the capture, it is necessary to directly capture the L2C signal. Since the shortest CM code has a code period of 20ms, according to the ordinary C / A code capture algorithm, a large amount of computing time and hardware are required. resource

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  • Fast capturing method for GNSS code
  • Fast capturing method for GNSS code
  • Fast capturing method for GNSS code

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail: present embodiment implements under the premise of the technical scheme of the present invention, has provided detailed implementation and specific operation process, but protection scope of the present invention is not limited to the following the embodiment.

[0039] The fast acquisition algorithm of a kind of GNSS long code of the present invention is specifically as follows figure 2 shown, including:

[0040] Step 1 initialization 100, mainly includes: configuring the pseudo code satellite number, setting the carrier frequency, setting the pseudo code period, setting the time of coherent integration and the number of times of non-correlation integration, setting the code phase frequency deviation threshold, carrier frequency deviation threshold, conjugate The delay time of multiplication and the phase offset of each correlation operation channel and chan...

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Abstract

The invention discloses a fast capturing method for a GNSS code. The fast capturing method mainly includes the steps that a code phase shift threshold and a carrier shift threshold are set in advance, a GNSS long code in a satellite signal and local pseudo code signals with different code phase shifts are subject to relevant processing, relevant results are subject to one-dimensional searching by a receiver, a correlation value is compared with the code phase shift threshold to acquire a code phase shift, and existence of a satellite is determined; then, one-dimensional carrier frequency searching is carried out, the correlation value is compared with the carrier shift threshold to acquire a carrier shift, and fast signal capturing is finished. The fast capturing method for the GNSS long code overcomes frequency shift accumulation brought by local crystal oscillators in the long code capturing process, and both sensitivity and speed are given consideration to finish fast long-code signal capturing without needing a large number of hardware resources.

Description

technical field [0001] The invention relates to a fast acquisition method for satellite signals, in particular to a fast acquisition method for long-period pseudocodes in GNSS (Global Navigation Satellite System) signals. Background technique [0002] The current focus around the GPS modernization process is the newly added navigation signal. L2C is the first civil navigation signal with a new structure after the modernization of GPS. Currently, there are 9 satellites in orbit, and by 2016, the entire network will be operational. [0003] The L2C and L1 signals have different signal structures. It consists of two signals consisting of two long codes CL and short codes CM. The CL code is the navigation channel code, and there is no modulation navigation message on it. The CM code is the data channel code. The modulation navigation message is limited by the bit jump of the message. [0004] The CM code is composed of 10230 chips, while the CL code is composed of 10230*75 chi...

Claims

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Application Information

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IPC IPC(8): G01S19/30
CPCG01S19/256G01S19/30
Inventor 胡晓峰何文涛蔺晓龙殷明翟昆朋王浩
Owner JIAXING MICROELECTRONICS & SYST ENG CENT CHINESE ACADEMY OF SCI
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