Two-axis four-frame stabilized platform structure

Abstract

The invention discloses a two-axis four-frame stabilized platform structure, which comprises an inner frame system and an outer frame system. The inner frame system and the outer frame system are connected through a stable axis. The outer frame system comprises an outer azimuth frame and an outer pitching frame, wherein the outer azimuth frame and the outer pitching frame are connected through a torque motor. The inner frame system comprises an inner azimuth frame and an inner pitching frame, wherein the inner azimuth frame and the inner pitching frame are connected through an azimuth axis. The top end of the azimuth axis passes through the inner wall of the inner azimuth frame and is connected with an azimuth goniometer in the inner azimuth frame. The stabilized platform is high in precision, but is slightly large in size and weight; and since the stable framework is arranged inside the platform body, disturbance torques of wind resistance torques and the like cannot act on a stable loop, and what influences stabilization precision is only some more deterministic factors of friction torques and the like, that is, higher stabilization precision can be achieved when flying with an aerial carrier.

Description

technical field [0001] The invention relates to the technical field of stable platform structures, in particular to a two-axis four-frame stable platform structure. Background technique [0002] At present, the existing stabilized platforms all adopt the form of two axes and two frames. Although the spherical stabilized platform in the form of two axes and two frames is compact in structure, small in size, light in weight and low in cost, it has two defects: [0003] (1) The stability accuracy is low. Since the platform body (namely, the pitch frame) is directly exposed to the external environment, external forces such as wind resistance directly act on the platform body, and there are large disturbance moments on the azimuth axis and the pitch axis. Therefore, the stability accuracy can only reach the mrad level when flying with the carrier aircraft; [0004] (2) There is a stability blind zone. When the optical axis of the sensor is vertically downward (commonly known a...

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Problems solved by technology

Therefore, the stability accuracy can only reach the mrad level when flying with the carrier aircraft;

[0004] (2) There are stability blind spots

For the third axis perpendicular to the azimuth axis and the pitch axis, the platform body does not have the degree of freedom of angular motion. Therefore, in this state, the system can only achieve single-axis stability of the pitch, and no longer has two degrees of freedom. degree of stability;

[0005] (3) Due to the poor aerodynamic shape at high altitude, the wind resistance is relatively large

The stable platform of this structure is only suitable for medium and low-speed aircraft (speed less than 200km / h) installation, not suitable for high-speed flight

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