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Direct sequence spread spectrum signal capturing method based on intelligent Doppler search

A direct-spread signal and Doppler technology, applied in the field of direct-spread signal acquisition based on intelligent Doppler search, can solve problems such as difficult to balance search scale and capture accuracy, achieve good search scale and capture accuracy, and reduce false capture Probability, Effect of Improving Doppler Acquisition Accuracy

Pending Publication Date: 2021-11-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the existing search strategies are difficult to balance the search scale and capture accuracy under complex conditions, and further research is necessary

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  • Direct sequence spread spectrum signal capturing method based on intelligent Doppler search
  • Direct sequence spread spectrum signal capturing method based on intelligent Doppler search
  • Direct sequence spread spectrum signal capturing method based on intelligent Doppler search

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Embodiment Construction

[0058] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0059] The present invention provides a direct spread signal acquisition method based on an intelligent Doppler search strategy. The method adopts fuzzy control with two different control rules according to the change characteristics of the signal accumulation energy in the real Doppler adjacent area and non-adjacent area. The controller adaptively adjusts the Doppler search step. The parameters of the fuzzy controller are designed for the purpose of reducing the search scale and reducing false capture in non-adjacent areas. The parameters of the fuzzy controller are designed for the purpose of improving the Doppler capture accuracy in the adjacent area.

[0060] Speci...

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Abstract

The invention provides a direct sequence spread spectrum signal capturing method based on intelligent Doppler search, which comprises the following steps of: according to the change characteristics of energy accumulation of a real Doppler adjacent region and a real Doppler non-adjacent region, performing adaptive adjustment of Doppler frequency stepping by adopting fuzzy controllers with two different control rules, and performing large search stepping in the non-adjacent region, so that the Doppler search scale is effectively reduced, small search stepping is adopted in an adjacent area, and the Doppler capture precision is effectively improved. Meanwhile, false capture possibly generated in a non-adjacent area and an adjacent area is considered when parameters of the fuzzy controller are designed, the false capture probability of signal capture is effectively reduced, and the search scale and capture precision of direct sequence spread spectrum signal capture can be better considered even under complex conditions.

Description

technical field [0001] The invention belongs to the field of aerospace measurement and control communication, and in particular relates to a direct spread signal acquisition method based on intelligent Doppler search. Background technique [0002] The acquisition of the direct spread signal needs to roughly estimate the Doppler frequency and the pseudo-code phase value of the signal before the receiver is tracked, so as to help the receiver to initialize the tracking loop and track the signal. Therefore, the performance of signal capture is very important to whether the tracking loop can successfully pull in, stabilize and track the received signal normally. During the transmission of spaceflight measurement and control signals, the influence of the environment and the transmission path leads to large changes in signal strength, as well as large changes in equivalent noise power caused by non-ideal factors such as interference. These unfavorable factors will seriously affect...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/30G01S19/29
CPCG01S19/246
Inventor 史学森何宜根王永庆申宇瑶沈人豪
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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