A Time Synchronization Method Based on Kalman Filter for Open-loop Network of Tdma Nodes

A technology of Kalman filter and time synchronization, applied in the field of communication network, can solve the problems of not introducing synchronization keeping function and not elaborated in detail.

Active Publication Date: 2017-01-11
SPACE STAR TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The paper "Realization of Accurate Synchronization in TDMA Networks" proposes to use Kalman filter for active time correction, but it does not elaborate on the clock modeling process and Kalman filter execution process, and it does not introduce the synchronization maintenance function

Method used

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  • A Time Synchronization Method Based on Kalman Filter for Open-loop Network of Tdma Nodes
  • A Time Synchronization Method Based on Kalman Filter for Open-loop Network of Tdma Nodes
  • A Time Synchronization Method Based on Kalman Filter for Open-loop Network of Tdma Nodes

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Embodiment

[0069] The Kalman filter estimates the time parameter state vector X(n) by measuring the clock error value Z(n) successively, so as to minimize the mean square error of the estimation error. Q 1 is the time parameter state covariance matrix and Q 2 is the observation noise covariance matrix. where Q 2 With randomness, this randomness is related to time or numerical quantization, receiver or converter noise, external precision limitations, and filter delay (response speed). That is, it has a great relationship with the difference of hardware devices. H(n) is the measurement matrix, and φ(n+1,n) is the system state transition matrix. φ(n+1,n), H(n), Q 1 and Q 2 are known. Predict clock t = θ + ωT, X = [θ ω] T , clock error measurement value Z(n)=t+ε, where ε initial clock bias, H=[1 0], Q 1 = σ θ 2 0 ...

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Abstract

The invention discloses a time synchronization method of an open loop network for a TDMA (Time Division Multiple Address) node based on a kalman filter. The time synchronization method comprises the following steps that: an NTR (Network Time Reference) node broadcasts a beacon message; after a non-NTR node receives a broadcast beacon, a time slot number of transmitting an inquiry message by the non-NTR node is determined and a local clock is updated; the non-NTR node and the NRT node interact an RTT-I (Round-Trip Time) message and an RTT-R message, and a measurement time is computed; the non-NTR node corrects the local clock by utilizing a synchronous filter, and checks a local prediction time through the measurement time obtained through RTT inquiry so as to correct, and a phase and a temperature excursion frequency at non-NTR time are estimated through iteration. According to the iterative estimation method, precise time synchronization can be implemented by a synchronous terminal. A synchronous filter can keep synchronization continuously within a longer time without updating of the measurement time. The time synchronization method solves the problem of time synchronization of the TDMA node under a high-dynamic quick travel environment, and has the advantages of capability of improving network synchronization precision, simple protocol processing, small amount of occupied resources and low equipment requirement.

Description

technical field [0001] The invention relates to an open-loop network time synchronization method for TDMA nodes based on a Kalman filter, belongs to the field of communication networks, and is suitable for wireless networks based on time division multiple access. Background technique [0002] The data link system obtains and processes target information in real time through the data link network, and the attack target realizes "discovery and destruction". The weapon system accesses the wireless channel timely and orderly through the multiple access protocol. Whether the selection and design of the multiple access protocol is reasonable plays a decisive role in the performance of the entire data link network. The TDMA transmission is reliable and the delay jitter is small, which is suitable for transmitting large-capacity real-time data. But TDMA needs to complete time slot synchronization between nodes, and it takes a long time to establish a link. [0003] In the traditi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
Inventor 王赏金世超赵媛李爽
Owner SPACE STAR TECH CO LTD
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