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A Distributed Beamforming Carrier Phase Synchronization Method Based on Sea Surface Wireless Sensor Network

A technology of wireless sensor network and carrier phase, which is applied in the field of wireless sensor network and distributed beamforming, which can solve the problems of slow phase synchronization between nodes, poor scalability, and low power of a single sensor, and achieve Doppler suppression effect, strong scalability, and the effect of achieving phase synchronization

Active Publication Date: 2017-06-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing time slot round-trip carrier synchronization method is applied to the direct communication between the sea surface sensor and the satellite, the source node adopts a linear structure, which leads to the problem that the method is not scalable and the phase synchronization between nodes is slow, and it is also to solve the problem of a single sensor The problem that the distributed light beam cannot reach the satellite caused by the small power is also to suppress the Doppler effect in the signal transmission process between nodes caused by the irregular movement of the sensor network nodes caused by the fluctuation of the sea surface. A wireless transmission based on the sea surface is proposed. Distributed Beamforming Carrier Phase Synchronization Method for Sensor Networks

Method used

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  • A Distributed Beamforming Carrier Phase Synchronization Method Based on Sea Surface Wireless Sensor Network
  • A Distributed Beamforming Carrier Phase Synchronization Method Based on Sea Surface Wireless Sensor Network
  • A Distributed Beamforming Carrier Phase Synchronization Method Based on Sea Surface Wireless Sensor Network

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specific Embodiment approach 1

[0022] Specific implementation mode 1, refer to figure 1 with figure 2 Specifically explain this embodiment, a method of carrier phase synchronization based on distributed beamforming of sea surface wireless sensor network described in this embodiment, this method is carried out under the condition of not considering the frequency and phase estimation error, the method includes Follow the steps below:

[0023] Step 1. Source node Node i Acquire and store data copy signal m(t), source node Node i Middle Node 1 Master node, Node K is a slave node, where K is a positive integer greater than or equal to 2; i is a positive integer greater than or equal to 1; K∈i;

[0024] Step 2. Destination node D sends to source node Node i Send a single-frequency beacon signal x 0 (t); source node Node i receiving said single-frequency beacon signal x 0 (t), and form the source node receiving signal y 0i (t);

[0025] The source node receives the signal y 0i (t) in y 01 (t) indicat...

specific Embodiment approach 2

[0034] Specific embodiment 2. This embodiment is a further description of a method for carrier phase synchronization based on distributed beamforming of the sea surface wireless sensor network described in specific embodiment 1. In this embodiment, the unit described in step 2 Frequency Beacon Signal x 0 The expression of (t) is

[0035] Among them, t 0 represents the start time, φ 0 Indicates the initial phase of the single-frequency single-frequency beacon signal at the target node D, w is the frequency, j 2 =-1, t is time;

[0036] The source node in step 1 receives the signal y 0i The expression of (t) is

[0037]

[0038] Among them, τ 0i Indicates the path delay from the destination node D to the source node Nodei (i=1,2,...,K);

[0039] When i=1, the master node receives the signal as

[0040] When i=2,3...K, the signal received by the slave node is y after being brought into the expression of the signal received by the source node 0K (t),

[0041] The ...

specific Embodiment approach 3

[0042] Specific implementation mode three, refer to image 3 Describe this embodiment in detail. This embodiment is a further description of a method for carrier phase synchronization based on a distributed beamforming of a sea surface wireless sensor network described in Embodiment 1 or 2. In this embodiment, the method described in step 3 Describe the main node Node 1 Receive signal y to master node 01 (t) Perform signal processing to obtain the master node carrier signal x 10 (t), the process of obtaining the carrier signal of the master node is realized by a phase discrimination circuit, and the process of obtaining the carrier signal of the master node is:

[0043] Step 31, master node Node 1 The local oscillator in produces a local oscillator signal O 1 (t), whose expression is Among them, φ 1 Indicates the initial phase of the local signal;

[0044] Step 32, according to the local oscillator signal O in step 31 1 (t), master node Node 1 The master node of rece...

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Abstract

The invention relates to a distributed beam forming carrier phase synchronization method based on a sea wireless sensor network, and belongs to the technical field of wireless sensor networks and distributed beam forming. The distributed beam forming carrier phase synchronization method is provided to solve the problems that an existing time slot back-and-forth carrier synchronization method is poor in expansibility, phase synchronization between nodes is slow and a distributed beam can not reach a satellite in time due to small power of a single sensor, and is provided to suppress the Doppler effect appearing in the process of signal transmission between the nodes. The distributed beam forming carrier phase synchronization method includes the steps that the target node sends a single frequency beacon signal to the main node and the auxiliary node, and the main node after being processed through a phase discrimination circuit obtains a main node modulating signal; the auxiliary node sends the received single frequency beacon signal to the main node, and the single frequency beacon signal processed through the main node is sent to the auxiliary node again to form an auxiliary node modulating signal; the main node modulating signal and the auxiliary node modulating signal are superposed in an in-phase mode at the target node to obtain power gain. The distributed beam forming carrier phase synchronization method is further suitable for the wireless sensor networks.

Description

technical field [0001] The invention belongs to the technical fields of wireless sensor network and distributed beam forming. Background technique [0002] The ocean is an important base for human beings to maintain their survival and reproduction and to achieve sustainable social development. Exploiting the ocean and developing the marine economy are the only way for human survival and social development. In view of the importance of the ocean, the monitoring of marine resources and the environment is becoming a research topic for countries all over the world. a hotspot. Marine information is usually transmitted using satellites as relays. The ocean is different from the land. It is impossible to set up large base stations on the sea to communicate with satellites. At the same time, base stations cannot be randomly distributed on the sea. Due to its low cost and small size, the sensor nodes can be distributed randomly on the sea surface, but the energy of a single sensor n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/18H04W84/18
Inventor 石硕胡瑞东贾敏马健欣顾学迈王雪余方圆田斯
Owner HARBIN INST OF TECH