Estimation method of toa location and precise location method based on this estimation method

Abstract

The invention discloses a TOA positioning estimation method and a precise positioning method based on the estimation method. The positioning method includes the steps of: transmitting a multi-carrier digital television signal with positioning information, the positioning information includes two-dimensional or three-dimensional coordinate position information and positioning data of the transmitting end, and the positioning data is a known sequence; performing a multi-carrier digital television signal received Time-domain frame synchronization, so as to obtain a rough estimate of the transmission delay; intercept the positioning data, use the TOA positioning estimation method to calculate a fine estimate of the transmission delay, and then obtain an estimated value of the distance between the receiving end and the transmitting end; find the distance between the receiving end and the transmitting end After estimating the distance between multiple transmitters, use the positioning algorithm to calculate the two-dimensional or three-dimensional position information and two-dimensional or three-dimensional velocity information of the user's location based on the estimated distance and two-dimensional or three-dimensional coordinate position information. The invention has the advantages of simple algorithm, fast positioning update speed, strong system compatibility, wide application range and accurate positioning.

Description

technical field [0001] The invention relates to the field of wireless digital transmission, in particular to a TOA positioning estimation method and a precise positioning method based on the estimation method. Background technique [0002] With the rapid increase of military and civilian demands for wireless precise positioning, wireless positioning technology has received extensive attention in recent years and has made great progress and development. The GPS (Global Positioning System, Global Positioning System) of the United States, the Galileo (Galileo) system of Europe, the GLONASS system of Russia, and the "Beidou" positioning system of my country, etc. (see document [1] E.D.Kaplan, C.Hegarty, "Understanding GPS: Principles and Applications, Second Edition, "Boston, USA: Artech House Publishers, 2005), with the huge advantages of wide-area coverage, it pushes radiolocation technology to a new level. [0003] However, there are still many shortcomings in the satellite p...

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Problems solved by technology

[0003] However, there are still many shortcomings in the satellite positioning system, such as: satellites transmit signals to the ground from an altitude of about 20,000 kilometers, and positioning errors will occur due to multipath effects, satellite orbit errors, ionospheric delay effects, etc.; The positioning probability in indoor and underground parking lots is almost zero, so it is difficult to use satellite positioning technology for emergency rescue positioning; the real-time performance of satellite positioning is poor, and the first positioning may take about 10 minutes It takes even longer time to complete the initialization and satellite search and then turn into the normal navigation and positioning working mode, which will delay the emergency rescue work; the satellite positioning system is usually limited by some military or political purposes, such as the US government adopts SA (Selective GPS) for GPS Availability, select available) policy, in special cases, the use of GPS satellite positioning will be interfered

In addition, expensive satellite receiving equipment is unacceptable for most ordinary civilian users

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