GNSS satellite acquisition method, device, storage medium and terminal

A technology for capturing devices and satellites, which is applied in the field of satellite communications to achieve the effect of reducing the amount of calculation, the complexity of calculation, and the number of times

Active Publication Date: 2018-11-13
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is how to accurately an

Method used

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  • GNSS satellite acquisition method, device, storage medium and terminal
  • GNSS satellite acquisition method, device, storage medium and terminal
  • GNSS satellite acquisition method, device, storage medium and terminal

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Embodiment Construction

[0038] Those skilled in the art understand that, as mentioned in the background, the existing GPS receiver needs to perform a two-dimensional search in the code domain and the Doppler domain during the CA code acquisition phase, such as figure 1 As shown, find peaks in the two-dimensional search results (ie figure 1 After a series of logical judgments are made at the "acquisition" place shown), it is determined whether the GPS receiver enters the tracking state. For example, the existing technology can adjust the phase of the CA code generated by the CA code generator and the frequency generated by the carrier numerically controlled oscillator (NCO) through synchronous control logic to complete the two-dimensional search, but this GNSS satellite The captured algorithmic complexity is high.

[0039] Further, since the aforementioned correlation in the search process can be equivalently realized by time-frequency transform and time-frequency inverse transform, for example, fast...

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Abstract

The invention relates to a GNSS satellite acquisition method, a GNSS satellite acquisition device, a storage medium and a terminal. The method includes the following steps that: CA code sequences transmitted by a satellite in a current preset period are received; frequency conversion is performed on a first sequence based on a preset frequency sample set, and the converted sequence is folded, so that at least one folded sequence can be obtained, wherein the first sequence is a sequence in the CA code sequences which is corresponding to a frequency offset of kilohertz of a non-integer; a secondsequence is cyclically shifted by a preset number of times, so that at least one cyclically shifted sequence can be obtained; after time-frequency transformation is performed on the at least one folded sequence, correlation processing is performed on the at least one time-frequency transformed sequence and the at least one cyclically shifted sequence, and time-frequency inverse transformation isperformed on a correlation result, and the modulus square of the transformed correlation result is obtained, and is stored in a two-dimensional space defined by code phases and frequencies; and non-coherent accumulation is performed on the processed correlation result of the current preset period and the correlation result of a previous preset period, so that a GNSS satellite can be captured basedon a two-dimensional space. With the GNSS satellite acquisition method, the GNSS satellite acquisition device, the storage medium and the terminal provided by the technical schemes of the by presentinvention adopted, the GNSS satellite can be quickly captured with lower system complexity and power consumption.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a GNSS satellite acquisition method and device, a storage medium, and a terminal. Background technique [0002] With the rapid development and popularization of the global navigation satellite system (Global Navigation Satellite System, referred to as GNSS), electronic devices such as mobile phones equipped with GNSS receivers can perform precise positioning based on the GNSS conveniently and quickly. For example, the GNSS receiver can receive wireless ranging signals transmitted by at least four GNSS satellites in the GNSS to realize its real-time positioning, timing, navigation and other functions. [0003] In order to realize the above functions, the GNSS receiver needs to be able to capture and track satellite signals of at least four GNSS satellites in the above GNSS, so as to position itself. For example, the GNSS receiver may be a GPS (Global Positioning S...

Claims

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Application Information

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IPC IPC(8): G01S19/29
CPCG01S19/29
Inventor 裴新欣
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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