Computing method and system for time migration error

Abstract

The invention discloses a computing method and system for a time migration error. The computing method for the time migration error comprises the following steps: when a new synchronous sample point is created, adding x of the new synchronous sample point to the basic value Ex of the sum of the x of the preset synchronous sample points in a synchronous sample table to obtain E'x; adding y of the new synchronous sample point to the basic value Ey of the sum of the y of the preset synchronous sample points to obtain E'y; adding square x of the new synchronous sample point to the basic value Ex2 of the sum of square x of the preset synchronous sample points to obtain E'x2; adding a product of x and y of the new synchronous sample point to the basic value Exy of the sum of the product of x and y of the preset synchronous sample points to obtain E'xy; computing the time migration error according to (E'xy - E'x X E'y / n) / (E'x2 - E'x X E'x / n), then respectively replacing Exy, Ex, Ey and Ex2 with E'xy, E'x, E'y and E'x2, in this way, during migration error computing each time, the sum computing for x and y of the existing stored synchronous sample points in the synchronous sample table is not needed, and the computing time is reduced.

Description

technical field [0001] The present invention relates to the technical field of wireless sensor networks, and more specifically, to a method and system for calculating time offset errors. Background technique [0002] The wireless sensor network is composed of a large number of micro sensor nodes deployed in the monitoring area, and forms a multi-hop self-organizing network through wireless communication. Moreover, each miniature sensor node has the ability to collect, store and process information, and can maintain communication with its neighbor nodes through wireless links. [0003] The sensor nodes of the wireless sensor network usually use the local crystal oscillator for timing, and the timing start time of different nodes is different. However, in the application of wireless sensor networks, precise time synchronization of nodes must be established when performing cooperative sensing and data fusion. For example, in the application of using two magnetic sensor nodes ...

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Problems solved by technology

[0013] In view of this, the present invention provides a time offset error calculation method and system to solve the problems of low channel utilization, high power consumption and node response events caused by long calculation time in the existing time offset error calculation method The problem of weak real-time

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