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Method for estimating the time of arrival of electromagnetic signals affected by multipath

A technology of electromagnetic signal and time of arrival, applied in the field of estimating and correcting multipath delay, estimating and eliminating multipath delay of electromagnetic signal, and can solve problems such as vertex offset, distortion, and estimated time of arrival error

Active Publication Date: 2017-04-12
SELEX ES
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  • Application Information

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Problems solved by technology

It can be seen that the related function ( Figure 4 (b)) is distorted, causing the associated vertices to shift and thus produce errors in estimating arrival times

Method used

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  • Method for estimating the time of arrival of electromagnetic signals affected by multipath
  • Method for estimating the time of arrival of electromagnetic signals affected by multipath
  • Method for estimating the time of arrival of electromagnetic signals affected by multipath

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Embodiment Construction

[0060] Signals (responses) received (directly or reflected) by various sources are filtered and down-converted. These signals are then sampled and thus transformed into the discrete time domain.

[0061] Multipath estimation according to the invention is achieved by calculating in advance the distortion of at least a single ideal pulse (the first pulse in the case of mode S according to an aspect of the invention) of the signal in terms of an autocorrelation function of discrete multiple delay values . exist Figure 10 In , the time offset is shown for an ideal signal with a pulse having a period of T.

[0062] From the ideal correlation function ( Figure 4 Given in (a)) based on the obtained distortion, it is possible to inverse the variation of the parameters of the pulse and estimate the effects of multipath to be compensated in the estimation of TOA.

[0063] Consider the fact that a single pulse corresponds to applying the method of the invention to a "clean" pulse (...

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Abstract

The present invention relates to a method of estimating and correcting multipath delay by analyzing the distortion of the autocorrelation function of each pulse received with the autocorrelation function of the ideal pulse; on the basis of obtaining the distortion relative to the ideal correction function, To extrapolate the variation of the pulse parameters and estimate the multipath effects, multipath effects will be taken into account to compensate for the estimation of the time of arrival (TOA) of the electromagnetic signal.

Description

technical field [0001] The present invention relates to methods for estimating and canceling multipath delays of electromagnetic signals such as SSR responses. [0002] More specifically, the invention relates to a method of estimating and correcting multipath delay by analyzing the distortion of the autocorrelation function of each single pulse received with that of the ideal pulse; based on the distortion obtained with respect to the ideal correlation function , the variation of the pulse parameters and an estimate of the multipath effects to be considered for compensation when estimating the time of arrival (TOA) of the electromagnetic signal can be obtained. Background technique [0003] With the term "multipath" it refers to the reflections of an electromagnetic wave being received and generated by the surrounding environment which undergo different attenuation (see figure 1 ) superposition phenomenon. Due to multipath, in addition to the direct signal sent by the sou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/364H04B1/7113
CPCG01R29/0273G01S13/781H04B1/10
Inventor 帕特利佐·德马可安东尼奥·迪玛佐
Owner SELEX ES