Navigation device and method for auto-docking of a robot

A robot device, comprising:

• a base station used for transmitting a guiding signal;
• and
• a robot including a first receiver, a second receiver and a third receiver, wherein the first receiver, the second receiver and the third receiver are used to receive the guiding signal, the second receiver and the third receiver are disposed at right and left of the first receiver of the robot at different angles, respectively;
• wherein the robot determines to bypass towards right or left according to the guiding signals received by the second receiver and the third receiver;
• and
• in the bypassing of the robot, the robot stops bypassing at a first position when the strength of the guiding signal received by the first receiver decreases or is reduced to zero,
• wherein when the strength of the guiding signal received by the second receiver is larger than the strength of the guiding signal received by the third receiver, the robot bypasses towards left, the robot keeps bypassing when the strength of the guiding signal received by the first receiver continually increases, and the robot stops bypassing when the strength of the guiding signal received by the first receiver decreases;
• wherein when the strength of the guiding signal received by the second receiver is smaller than the strength of the guiding signal received by the third receiver, the robot bypasses toward right, and the robot keeps bypassing when the strength of the guiding signal received by the first receiver gradually increases, and the robot stops at the first position when the guiding signal received by the first receiver decreases.