The embodiment of the invention discloses an antenna unfolding and folding
system. The
system comprises a middle block antenna, at least one side block antenna, a first hinge shaft, a convex block, a second hinge shaft, a third hinge shaft, an electric cylinder, a
pressure sensor, an angle sensor, a first positioning block, a second positioning block and a controller, the controller is connected with the
pressure sensor, the angle sensor and the electric cylinder and used for controlling the first positioning block to move when the first positioning block makes contact with the second positioning block. The counter-acting force of the first positioning block is calculated according to the current rotation angle, measured by the angle sensor, of the side block antenna, the current acting force, measured by the
pressure sensor, of the electric cylinder, the weight of the side block antenna and the corresponding force arm, and the first rotation speed of the side block antenna around the middle block antenna is calculated according to the counter-acting force and a preset damping coefficient; and controlling the electric cylinder to act according to the first rotation speed to unfold the side block antenna.