Computing method for accurate time delay based on long term evolution (LTE) locating and reference signal characteristic

Abstract

The invention discloses a computing method for accurate time delay based on a long term evolution (LTE) locating and reference signal characteristic. Firstly, a corresponding correlation chart between a time difference and a phase difference from a source node to two anchor nodes respectively is built, then an integral value of a receiving signal between the source node and each pair of anchor nodes is calculated, and finally the calculated integral value of each receiving signal between the source node and each pair of anchor nodes serves as the phase difference. In the corresponding correlation chart between the time difference and the phase difference, the time difference is inquired and obtained. Through utilization of the LTE locating and reference signal characteristic, corresponding correlations between the time difference and the phase difference from the source node to an aim node are built. On the basic of constructing the corresponding correlation chart between the time difference and the phase difference, and through product and integral operation on the receiving signals in a time domain, the accurate time delay can be obtained through looking up on the chart according to a computing result.

Description

technical field [0001] The invention relates to an accurate time delay calculation method based on characteristics of an LTE positioning reference signal, and belongs to the technical field of wireless communication. Background technique [0002] With the rapid increase in the number of mobile Internet users, the demand for wireless positioning services continues to increase. In recent years, the LTE (Long Term Evolution, Long Term Evolution) system has been gradually put into commercial use, and more and more users have begun to use the positioning service provided by the LTE network. The downlink of the LTE system adopts OFDM (Orthogonal Frequency Division Multiplexing) technology, and the maximum bandwidth can reach 20MHz, which has great advantages in improving positioning accuracy. [0003] Accurate delay estimation technology is the basis for ranging and positioning. In the LTE physical layer standard, 3GPP initially only stipulated three kinds of reference signals fo...

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Problems solved by technology

[0004] The traditional signal propagation delay difference estimation algorithm is based on correlation delay estimation. The algorithm principle is simple, and the calculation amount is small and easy to implement. The disadvantage is that the estimation accuracy is limited by the sampling rate, and the delay less than one sampling interval cannot be estimated.

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