High precision time synchronization method suitable for precise positioning system
A time synchronization and precise positioning technology, applied in the direction of synchronization devices, electrical components, wireless communication, etc., can solve the problem of insufficient TDOA accuracy, achieve the effect of strong feasibility, simple implementation, and improved positioning accuracy
Inactive Publication Date: 2014-12-10
杭州绿宇通信技术有限公司
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[0004] The present invention proposes a high-precision time synchronization method suitable for precise positioning systems, which solves the problem that the accuracy of TDOA is not high enough in the prior art
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[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0021] Such as Figure 2~3 As shown, a method for high-precision time synchronization suitable for precise positioning systems includes the following steps,
[0022] Step 1, juxtapose at least two positioning base stations of base station A and base station B, and quantify the transmission time of the wireless signal between base station A and base station B as ΔT1,
[0023] Step 2, base station A sends time synchronization frame S1 to base station B at time T1, r...
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The invention provides a high precision time synchronization method suitable for a precise positioning system. According to a time synchronization frame S1 transmitted by a base station A and the time synchronization frame S1 received by a base station B, a relative time relation between the base station A and the base station B is established; the base station A transmits time synchronization information M1 to a time synchronization engine, so that a data relation between the time synchronization engine and the base station A is realized; the base station B transmits time synchronization information M2 to the time synchronization engine, so that a data relation between the time synchronization engine and the base station B is realized; and the time synchronization engine analyzes and calculates the time synchronization information M1 transmitted by the base station A and the time synchronization information M2 transmitted by the base station B so as to achieve time synchronization of the base station A and the base station B. The high precision time synchronization method can improve the time synchronization precision to 0.02 microsecond, thereby greatly improving the positioning precision of the precise positioning system.
Description
technical field [0001] The invention relates to precise positioning technology, in particular to a high-precision time synchronization method suitable for precise positioning systems. Background technique [0002] TDOA positioning (Time Difference of Arrival Time Difference of Arrival) is a positioning method using time difference. By measuring the time it takes for the signal sent by the positioning tag to reach the positioning base station, the distance to the signal source can be determined. TDOA positioning system (such as figure 1 Shown) Using the distance from the signal source to each positioning base station, the position of the signal can be determined. By comparing the time difference between the signals arriving at each positioning base station, a hyperbola with the positioning base station as the focus and the distance difference as the long axis can be drawn. The intersection point of the hyperbola is the position of the signal source. [0003] In order to re...
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IPC IPC(8): H04W56/00H04W64/00
Inventor 包建义钱克勤
Owner 杭州绿宇通信技术有限公司