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A Doppler Estimation Method Based on Determination of Interval Search Based on Constructed Objective Derivative Function

A technology of Doppler estimation and objective function, which is applied in the field of Doppler estimation based on the construction of the target derivative function to determine the interval search, which can solve the problem that the search results cannot achieve high precision and high efficiency, the lack of knowledge of the search space, and the blindness of the search and other issues to achieve the effect of narrowing the scope of search, precise search and wide applicability

Inactive Publication Date: 2018-04-13
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, because the search algorithm is less relevant to the actual problem and does not know much about the search space, the search will have a certain degree of blindness, and the defect of the algorithm itself will cause the search results to fail to achieve high precision and high efficiency

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  • A Doppler Estimation Method Based on Determination of Interval Search Based on Constructed Objective Derivative Function
  • A Doppler Estimation Method Based on Determination of Interval Search Based on Constructed Objective Derivative Function
  • A Doppler Estimation Method Based on Determination of Interval Search Based on Constructed Objective Derivative Function

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Embodiment Construction

[0064] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0065] Such as figure 1 , a Doppler estimation method based on the construction of the target derivative function to determine the interval search, including the steps in the following order:

[0066] (1) The sending end sends the LFM signal f(t);

[0067] (2) The receiving end receives the signal r(t) with Doppler frequency shift and noise;

[0068] (3) Discrete the received signal r(t) into r(n);

[0069] (4) Construct the objective function in, is an ideal noise-free received signal;

[0070] (5) Find the minimum value of the objective function to obtain the required Doppler frequency shift factor.

[0071] In step (5), described Doppler frequency shift factor obtains with following steps:

[0072] A. For the objective function Derivation to find the Dopple...

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Abstract

The invention discloses a Doppler estimation method based on constructing a target derivative function to determine an interval search, which includes the following steps: the sending end sends the LFM signal f(t); the receiving end receives the signal f(t) with Doppler frequency shift and noise signal r(t); discretize the received signal r(t) into r(n); construct an objective function where is an ideal noise-free received signal; find the minimum value of the objective function to obtain the required Doppler frequency shift factor. The method of the invention estimates the Doppler frequency shift by constructing an objective function to solve the optimal value, is easy to realize, has a simple structure, and can obtain higher estimation precision.

Description

technical field [0001] The invention relates to the field of signal underwater Doppler frequency shift estimation, in particular to a Doppler estimation method based on constructing target derivative function to determine interval search. Background technique [0002] In recent years, with the urgent need for the utilization of marine resources, land-based communication systems have gradually developed into underwater communication systems. Electromagnetic waves are usually used for wireless communication on land, but under the seabed, the absorption and attenuation of electromagnetic waves during propagation are relatively serious, and sound waves are currently the only energy that can travel long distances underwater. The underwater channel is a very complex channel. Due to the relative movement between the transmitter and the receiver, the change of channel conditions, etc., it will cause the Doppler frequency shift of the underwater acoustic channel, which will cause the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 宁更新刘云磊李杰季飞韦岗
Owner SOUTH CHINA UNIV OF TECH