Management ship and working robots in waters based on wireless network and working robot control method thereof

• US 20080082210A1
• Filed: 09/27/2007
• Published: 04/03/2008
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Choi, Woo-Young, Ahn, Byung-Jun, Kim, Bup-Joong
• Granted Patent: US 7,970,493 B2
• Time in Patent Office: Days
• US Class Current: 700/255
• CPC Class Codes: B63B 35/32 for collecting pollution from open water
• CPC Class Codes: E02B 15/04 Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials stopping water-borne material in artificial water canals E02B5/085; stopping water-borne material at barrages or weirs E02B8/023; other treatment of water, waste water or sewage C02F; materials for treating liquid pollutants, e.g. oil, gasoline, fat, C09K3/32 ; separation of oil in sewage conduits E03F5/16

Abstract

Provided are a management ship and working robots in waters based on a wireless network and a method for controlling working robots thereof. The robot-ship group includes: a signal strength measuring unit for measuring strengths of pre-defined signals; and a working robot control unit for determining which of the first mother ship and the second mother ship the working robot is to communicate with according to a comparison result of the signal strength, and controlling the working robots to perform the work according to a set-up route, wherein the first mother ship includes: a working robot preparing unit for performing a preparation work required before and after the working robots perform the work; and a mother ship control unit for transmitting the pre-defined signal to the working robot and communicating data with the working robot.

Claims

1. A robot-ship group for executing a work operation on sea and river, the robot-ship group comprising:

at least one working robot;

a first mother ship having the working robots; and

a second mother ship whose communication region is overlapped with a communication region of the first mother ship,

wherein the working robot includes;

a signal strength measurement means for measuring strength of pre-defined signals transmitted from the first mother ship and the second mother ship; and

a working robot control means for determining which of the first mother ship and the second mother ship the working robot is to communicate with according to a comparison result of the signal strength measured in the signal strength measurement means, and controlling the working robots to perform the work according to a set-up route, and

wherein the first mother ship includes;

a working robot preparing unit for performing a preparation work required before and after the working robots perform the work; and

a mother ship control unit for transmitting the pre-defined signal to working robot left from the working robot preparing unit and communicating data with the working robot through the authenticated second mother ship upon communication end request of the working robot.

2. The robot-ship group of claim 1, wherein the working robot further includes:

an image/sensing means for providing image/sense information to the working robot control means in order to set up a route according to a route of a specific material or a specific object; and

a navigation measurement means for providing measurement information to the working robot control means in order to set up a route according to a command transmitted from the mother ship which is determined to perform communication with the working robots between the first mother ship and the second mother ship

3. The robot-ship group of claim 1, the working robot further includes:

a collision object sensing means for sensing an object which may collide with the working robot in advance while the working robot in motion or stand still,

wherein the working robot control means senses a collision object in advance based on the information transmitted from the collision object sensing means and prevents collision.

4. The robot-ship group of claim 1, wherein the working robot control means calculates an average value of the signal strength measured by the signal strength measurement means with respect to a predetermined time and determines which of the first mother ship and the second mother ship the working robot is to communicate with.

5. The robot-ship group of claim 1, wherein the working robot control means frequently checks whether the signal strength measured in the signal strength measurement means is the same or larger than a predetermined threshold, and determines which of the first mother ship and the second mother ship the working robot is to communicate with.

6. The robot-ship group of claim 1, wherein the working robot control means determines which of the first mother ship and the second mother ship the working robot is to communicate with and maintains the received pre-defined signal strength on the basis of threshold in order to have an optimal signal strength for communication with the mother ship.

7. The robot-ship group of claim 6, wherein although the working robot is out of a communication region of the mother ship, the working robot control means changes a direction toward the mother ship based on location information of the mother ship included in the signals transmitted from the mother ship which is determined to communicate with the working robot and reenters the communication region of the mother ship.

8. The robot-ship group of claim 1, wherein the mother ship control unit authenticates the working robots and the second mother ship by using pre-allocated encoding/decoding codes.

9. A method for controlling working robots for a work on sea and river through a wireless network formed by a first mother ship having at least one working robot for work on the sea or river and a wireless network formed by a second mother ship whose communication region is overlapped with the communication region of the first mother ship, the method comprising the steps of:

a) measuring strength of pre-defined signals transmitted from the first mother ship and the second mother ship;

b) comparing strength of the signals measured in the step a), and determining which of the first mother ship and the second mother ship the working robot is to communicate with; and

c) performing data communication with a determined mother ship and performing a work according to a set-up route.

10. The method of claim 9, wherein the step c) includes the steps of:

c1) When the working robot is determined to communicate data with the second mother ship, requesting the first mother ship for information needed to communicate with the second mother ship;

c2) When the requested information is received from the first mother ship, notifying movement into the communication region of the second mother ship to the first mother ship and requesting the second mother ship for a temporary communication address; and

c3) ending communication with the first mother ship upon receipt of the temporary communication address and communicating with the second mother ship based on the temporary communication address.

11. The method of claim 9, wherein in the step c), the route is set up according to a route of a specific material or a specific object, or set up according to a command transmitted from the mother ship.

12. The method of claim 9, wherein in the step c), an object which is on the route and may collide with the working robot is sensed in advance, and location of the working robot is changed.