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Determination method in allusion to homogenous signal time difference under multipath environment

A measurement method and signal technology, applied in the field of electronic information, can solve problems such as insufficient measurement result accuracy

Inactive Publication Date: 2012-12-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Abstract
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Problems solved by technology

[0008] The solution of the present invention is based on the generalized cross-correlation method of the background technology, aiming at defects such as the accuracy of the specific information of the signal required in the actual engineering application and the insufficient precision of the measurement result, the present invention introduces the autoregressive method, that is, uses The linear combination of random variables at several moments in the previous period is used to describe the linear regression method of random variables at a certain moment in the future. This method is usually expressed as:

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  • Determination method in allusion to homogenous signal time difference under multipath environment
  • Determination method in allusion to homogenous signal time difference under multipath environment
  • Determination method in allusion to homogenous signal time difference under multipath environment

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Embodiment Construction

[0046] This embodiment takes the second-order autoregressive method as an example, namely:

[0047] s(t)=α 1 s(t-1)+α 2 s(t-2)+v(t)

[0048] α 1 , Α 2 Denote the first-order and second-order autoregressive parameters respectively.

[0049] The stability condition of the autoregressive model is: α 2 +α 1 2 | 1 =1.9114 and α 2 = -0.95, the residual v(t) is white Gaussian noise with variance equal to 1.

[0050] After the signal source sends out the signal, the signal received by the first receiver is x 1 (t); the signal received by the second receiver x 2 (t) is the mixed signal formed by the signal transmitted by the signal source propagating through two paths, where the time difference corresponding to the largest peak in the cross-correlation spectrum is the second receiver relative to the first receiver receiving the signal source The time delay value of the signal; as described in the background art, due to the existence of multipath effects, x 2 (t) contains two signals transmitte...

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Abstract

The invention relates to a determination method in allusion to homogenous signal time difference under a multipath environment. The determination method comprises the following steps of: establishing a received signal sample, determining residual errors including self-correlation processing and determination of auto-regression parameters and finally determining time difference of two paths of signals through acquiring a cross-correlation spectrum of residual errors of two paths of signals. According to the invention, compared with the prior art that two paths of received homogenous sampled signals are directly cross-correlated, the determination method disclosed by the invention has the characteristics that residual errors of two paths of sampled signals are cross-correlated by an auto-regression method to ensure that related peak shapes are sharp and are still easy to distinguish even though arrival time difference of each signal is shorter, thereby effectively improving the time difference measurement resolution rate and accuracy; and the time difference value measured by the determination method accords with the theoretical value. Therefore, the determination method has the characteristics of being high in resolution ratio of the cross-correlation spectrum of sampled signals under the multipath environment, effectively improving the signal time difference determination accuracy, providing accurate parameters for subsequent positioning of a target signal source and the like.

Description

Technical field [0001] The invention belongs to a method for measuring the time difference in a multipath environment in the field of electronic information technology, and particularly relates to a method for measuring the time difference of each signal receiver for a homologous signal in a multipath environment. Background technique [0002] With the rapid development of signal arrival time difference positioning technology, radio positioning technology has been widely used in the field of radio monitoring. AOA (Angle of Arrival Positioning), TOA (Time of Arrival Positioning), and TDOA (Time of Arrival Positioning) are currently the most promising cellular system mobile station positioning technologies. The arrival time difference, or arrival time delay, refers to the time difference between the homologous signals received by different receivers in the receiver array due to different transmission distances. Determining the time difference is an important part of signal detecti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00H04W64/00G01S7/02H04B17/309
Inventor 万群罗来源魏合文文飞杨雪菲李金洋段林甫
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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