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Improved time delay estimation method based on mutual correlation

A delay estimation and cross-correlation technology, which is applied in the field of indoor navigation and positioning, and can solve problems such as poor delay estimation accuracy.

Inactive Publication Date: 2017-02-08
北斗时空信息技术研究院(北京)有限公司 +1
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Problems solved by technology

The generalized cross-correlation method, a commonly used algorithm in TDOA positioning, has good delay estimation accuracy when the signal-to-noise ratio is high, but when the signal-to-noise ratio decreases, the delay estimation accuracy is poor

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  • Improved time delay estimation method based on mutual correlation
  • Improved time delay estimation method based on mutual correlation

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] refer to figure 1 The detailed flow chart of the improved time delay estimation method based on cross-correlation performs the following series of algorithm operations on the signal at the receiving end:

[0035] Four base station signal sources in wireless sensor network send signal s i (t) (i=1, 2, 3, 4) is disturbed by noise after channel transmission, and s i (t) The signal source is the same signal source with different delays, then the signal at the receiving end is x i (t)=A i s(t-d i )+n i (t) suppose s i (t) and n i (t) (i=1, 2, 3, 4) are not correlated with each other, then x 1 (t) and x 2 (t), x 1 (t) and x 3 (t), x 1 (t) and x 4 (t) Perform cross-correlation within a finite period, and perform Fourier transform on the discrete cross-correlation function:

[0036] ...

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Abstract

The present invention belongs to the indoor navigation positioning technology field, and relates to an improved time delay estimation method based on mutual correlation, especially to a wireless sensor network indoor timing time delay estimation method. The technical scheme of solving the problem is the improved time delay estimation method based on mutual correlation, comprising the following steps: the step 1, sending signals to a receiving terminal at four base stations in a wireless transmission network; the step 2, performing mutual correlation operation of the signals, wherein the peak point of the function is the time difference of two base station signals reaching the receiving terminal; the step 3, using a parabola interpolation method to obtain the maximum value; and the step 4, obtaining the time delay of the signal receiving terminal and the distance difference between the base stations and the receiving terminal according to the distance different algorithm. The improved time delay estimation method based on the mutual correlation can estimate the non-integer time delay in the non-correlation background noise so as to solve the platform problem that the error cannot be overcome when the time delay true value is not the integral multiple of the sample interval, improve the noise robustness and improve the indoor location precision.

Description

technical field [0001] The invention belongs to the technical field of indoor navigation and positioning, and relates to an improved time delay estimation method based on cross-correlation. Background technique [0002] At present, the Beidou / GPS satellite navigation and positioning system has developed maturely and can meet the application requirements of outdoor navigation and positioning. However, when positioning indoors, this system has its limitations, and the satellite signal is greatly attenuated when it penetrates the building; the equipment price High, not suitable for promotion in indoor positioning systems. Wireless sensor network positioning is widely used in indoor positioning because of its low cost, low power consumption, and easy expansion. Since the signal will be affected by multipath effects when it propagates indoors, the angle and amplitude of reaching the receiving end will change. It is difficult to measure the distance between the base station and t...

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Application Information

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IPC IPC(8): G01S5/00
CPCG01S5/0045
Inventor 张国川
Owner 北斗时空信息技术研究院(北京)有限公司
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