TOA positioning estimation method and precise positioning method based on same

Abstract

The invention discloses a TOA positioning estimation method and a precise positioning method based on the same. The positioning method comprises the following steps of: transmitting a multi-carrier digital television signal carrying positioning information, wherein the positioning information comprises the two-dimensional or three-dimensional coordinate position information and the positioning data of a transmitting end, and the positioning data is a known sequence; carrying out time-domain frame synchronization on the received multi-carrier digital television signal so as to obtain a rough transmission time-delay estimation value; intercepting the positioning data and calculating by utilizing the TOA positioning estimation method to obtain a fine transmission time-delay estimation value so as to obtain an estimation value of a distance between a receiving end and a transmitting end; and after the estimation values of the distances between the receiving end and a plurality of transmitting ends are solved, calculating to obtain the two-dimensional or three-dimensional position information and the two-dimensional or three-dimensional speed information of the position of a user according to the distance estimation values and the two-dimensional or three-dimensional coordinate position information. The invention has simple algorithm, high speed of positioning update, strong system compatibility and wide application range and can realize precise 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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