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Distributed self-adaptation direct positioning method based on time difference

A positioning method and self-adaptive technology, applied in the field of signal processing

Inactive Publication Date: 2015-04-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a time-difference-based distributed adaptive direct positioning method for the defects existing in the existing centralized self-adaptive positioning method

Method used

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  • Distributed self-adaptation direct positioning method based on time difference
  • Distributed self-adaptation direct positioning method based on time difference
  • Distributed self-adaptation direct positioning method based on time difference

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Embodiment Construction

[0066] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. A distributed adaptive direct positioning method based on time difference, comprising the following steps:

[0067] 1. Initialization: each receiver prepares for initialization, and sets the initial value of position iteration and gain iteration initial value Set the iteration step size of each position μ i , set the gain iteration step size μ α,i ;

[0068] 2. Collect data: each receiver starts to receive the signal transmitted by the transmitter at the same time, demodulates and samples the signal, and obtains the discrete received signal of the baseband;

[0069] 3. The first data exchange: Each receiver transmits the discrete baseband signal received by itself to the neighbor receiver, and at the same time receives the discrete baseband signal from the neighbor receiver;

[0070] 4. Adaptive calculation: Each receiver calculates accor...

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Abstract

The invention provides a distributed self-adaptation direct positioning method based on time difference to overcome the defects existing in a centralized positioning method. The method comprises the following steps that firstly, data are collected, wherein all receivers receive signals transmitted by a transmitter at the same time, and demodulating and sampling are carried out on the signals to obtain dispersed received signals of a base band; secondly, primary data exchanging is carried out, wherein the receivers send the dispersed base band signals received by the receivers to the adjacent receivers; thirdly, self-adaptation operation is carried out, wherein the receivers carry out operation on the formula (please see the formula in the specification); fourthly, secondary data exchanging is carried out, wherein the receivers send the obtained result (please see the result in the specification) to the adjacent receivers; fifthly, combining is carried out, wherein the receivers carry out operation according to the formula (please see the formula in the specification); sixthly, the difference values of iteration values obtained after the formula (please see the formula in the specification) is carried out 50 times are smaller than a threshold value delta, and then the position estimation value of the transmitter is regarded to be obtained. According to the positioning method, extendibility and the positioning speed are high, and the working robustness is strong.

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a distributed self-adaptive positioning method in a time difference-based passive positioning system. Background technique [0002] At present, the passive positioning technology based on time difference can be divided into two categories according to whether it needs to calculate the time difference value: two-step positioning method and direct positioning method. In the two-step positioning method, the time difference value is estimated by receiving the signal in the first step, and the positioning solution is performed using the estimated time difference value in the second step. The direct positioning algorithm does not need to calculate the time difference, and directly uses the received signal to estimate the position of the target. In the case of low signal-to-noise ratio of the received signal, the positioning accuracy of the direct positioning method is higher. Direct ...

Claims

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Application Information

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IPC IPC(8): G06F19/00G01S5/10
Inventor 夏威刘威朱凌峰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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