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Long-code segmentation overlay local correlation capture method based on GPU

A segmented overlapping and long code technology, applied in the field of satellite navigation, to achieve the effect of improving real-time performance, increasing search speed, reducing scale and storage requirements

Active Publication Date: 2017-05-31
湖南中电星河电子有限公司
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Problems solved by technology

[0004] Aiming at the problem of a large number of code phase searches when long-period pseudo-codes are directly captured, the present invention proposes a GPU-based long-code segmentation overlapping local correlation capture method

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0033] For the long-period pseudo-code, take the GPS P code as an example, the pseudo-code period is 7 days, the pseudo-code does not repeat during the entire capture processing period, and the correlation calculation of the entire pseudo-code period cannot be performed like the short code.

[0034] First according to the local time t 0 , take [t 0 t 0 +t] long code data with a duration of t in the time period, and generate a sampling rate of f s , a local reference signal sequence p(n) with a duration of t, where p(n) is {p(0) p(1) … p(tf s )}. Supplement Tf with the local reference signal sequence p(n) s 0, get p 0 (n), namely

[0035]

[0036] Note that the pseudo code rate is f p , at sampling rate f s (f s >2f p ) s...

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Abstract

aiming at the search problem of lots of code phases when the long-period pseudo codes are directly captured, the present invention provides a long-code segmentation overlay local correlation capture method based on the GPU. input data is divided in the segment mode to reduce the scale of data processing and storage requirement, is suitable for GPU realization of different performances, can help a multi-core processor to perform parallel task processing of data while data division, and can fully develop multi-core parallel processing advantage. The long-code segmentation overlay local correlation capture method based on the GPU employs FFT parallel search pseudo code phase and employs hundreds of floating-point calculation units in the GPU to perform batch processing segment data acceleration FFT operation so as to improve the long-code pseudo code phase capture speed and have a great meaning of the satellite navigation spread spectrum signal software.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for capturing long-period pseudo-code spread-spectrum signals, and more particularly to a GPU-based long-code direct capture method. Background technique [0002] The anti-interference performance of long-period pseudo code spread spectrum signal is stronger than that of short code. Under the interference condition of short code, it can only rely on the direct acquisition of long code. Therefore, direct acquisition technology of long code is a research hotspot in the field of navigation. In the acquisition phase of the pseudo-code spread spectrum signal, it is necessary to search and determine the phase of the pseudo-code and the initial value of Doppler. The uncertain range of the code phase that needs to be searched for when the long code is directly captured is larger than that of the short code, usually 10% of the search range of the short code. 3 ~10 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/29G01S19/30
CPCG01S19/29G01S19/30
Inventor 牟卫华唐小妹马春江欧钢王飞雪孙广富倪少杰高毅李壮
Owner 湖南中电星河电子有限公司
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