CN113639740A - Scanning shaft rotating method of conical scanning structure - Google Patents
Scanning shaft rotating method of conical scanning structure Download PDFInfo
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- CN113639740A CN113639740A CN202110946280.5A CN202110946280A CN113639740A CN 113639740 A CN113639740 A CN 113639740A CN 202110946280 A CN202110946280 A CN 202110946280A CN 113639740 A CN113639740 A CN 113639740A
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- scanning
- imaging
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- star sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/02—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 by astronomical means
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Astronomy & Astrophysics (AREA)
- Automation & Control Theory (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a scanning axis rotating method of a conical scanning structure, relates to the field of detection technology and instruments and meters, and creates a static or small dynamic suitable condition for a star sensor to view a star. The content comprises the following steps: the method comprises the following steps of arranging a plurality of imaging angle positions in the whole periphery of a scanning shaft of the conical scanning structure, wherein in the neighborhood of each imaging angle position, the angular rate of the scanning shaft changes according to a set function: the imaging angular position is preceded by a deceleration phase and is followed by an acceleration phase, at which the angular rate reaches a minimum value and an electrical trigger-to-photograph signal is generated. The functional forms include sinusoidal functions, conic functions, inverse trigonometric functions, and trigonometric functions. The function may include a bias such that the function value is not less than zero. The star sensor imaging method is suitable for the star sensor for viewing the star in the daytime, provides the required static or small dynamic imaging conditions for the star sensor to view the star, avoids the problem of dynamic trailing of the star sensor imaging, and improves the attitude determination precision of the star sensor.
Description
Technical Field
The invention relates to the field of detection technology and instruments and meters, in particular to a scanning shaft rotating method of a conical scanning structure.
Background
The day star observation and attitude determination in the atmosphere of the star sensor is a current astronomical navigation key technology. Under the condition of viewing stars in the atmosphere, a small-view-field star sensor is suitable to be selected to reduce the sky background imaging level value, so that the signal-to-noise ratio is improved. Aiming at the application conditions of viewing stars in the atmosphere, the current design scheme at home and abroad adopts a multi-view-field star sensor, and the problem of insufficient number of stars observed by a monocular small-view-field star sensor is solved by increasing the number of the star sensors. However, the device has the disadvantages of complicated structure, large volume and weight, difficult design of a signal processing system and poor reliability. The invention designs a scanning axis rotating method of a conical scanning structure, the conical scanning structure is only provided with a monocular small-view-field star sensor, the problem that a multi-view star sensor is complex in structure of a device for observing the star in the daytime is ingeniously solved, and static or small dynamic conditions required by the star sensor for observing the star are guaranteed.
Disclosure of Invention
The invention aims to provide a scanning axis rotating method of a conical scanning structure, which creates a static or small dynamic suitable condition for a star sensor to view a star and is beneficial to solving the problem of dynamic trailing of imaging of the small-field star sensor.
The purpose of the invention is realized by the following technical scheme: the method comprises the following steps of arranging a plurality of imaging angle positions in the whole periphery of a scanning shaft of the conical scanning structure, wherein in the neighborhood of each imaging angle position, the angular rate of the scanning shaft changes according to a set function: the imaging angular position is preceded by a deceleration phase and is followed by an acceleration phase, at which the angular rate reaches a minimum value and an electrical trigger-to-photograph signal is generated. The functional forms include sinusoidal functions, conic functions, inverse trigonometric functions, and trigonometric functions. The function may include a bias such that the function value is not less than zero.
The beneficial effects of the invention are illustrated as follows:
the invention provides a scanning axis rotating method of a conical scanning structure, which is suitable for a star sensor for observing a star in the daytime, provides a required static or small dynamic imaging condition for the star sensor to observe the star, and avoids the problem of dynamic trailing of the star sensor imaging, thereby improving the attitude determination precision of the star sensor.
Drawings
FIG. 1 is a schematic representation of the angular rate of the scan axis as a function of angular displacement in a preferred embodiment. In the figure, 1 is a constant speed stage, 2 is a deceleration stage, and 3 is an acceleration stage.
Detailed Description
The present invention will be described in further detail with reference to preferred embodiments. The following examples are given to illustrate the present invention, but are not intended to limit the scope of the present invention.
Setting a plurality of imaging angular positions on the whole periphery of a scanning shaft of the conical scanning structure, and executing scanning according to the following steps:
(1) the scanning shaft starts to rotate in an accelerated manner from an initial state according to a fixed direction, and the scanning shaft is shifted to a constant speed stage after reaching the maximum angular speed; (2) in the uniform velocity stage, the scanning shaft rotates at a constant angular velocity;
(3) and when the scanning axis enters the neighborhood range of the imaging angle position, the star sensor is switched into a deceleration mode from the uniform speed mode. In the mode, the scanning angular rate of the scanning shaft is reduced according to a sine function rule with offset, and a trigger electric signal is generated at an imaging angular position to enable the star sensor to take a picture. After passing through the imaging angle position, the scanning angle rate is increased according to a sine function rule, and when the scanning angle rate reaches the maximum value, the system is switched from an acceleration stage to a constant speed stage;
(4) repeating links (2) (3) for each imaging angular position, cycling through the perimeter.
Claims (4)
1. A method for rotating a scanning shaft of a conical scanning structure is characterized in that: and setting a plurality of imaging angle positions on the whole periphery of the scanning shaft, wherein the angular rate of the scanning shaft changes according to a set function in the neighborhood of the imaging angle positions.
2. The scan axis rotating method according to claim 1, wherein: the imaging angular position is preceded by a deceleration phase and is followed by an acceleration phase, at which the angular rate reaches a minimum value and an electrical trigger-to-photograph signal is generated.
3. The scan axis rotating method according to claim 1, wherein: the functional forms include sinusoidal functions, conic functions, inverse trigonometric functions, and trigonometric functions.
4. The scan axis rotating method according to claim 1, wherein: the functional form may include a bias such that the function value is not less than zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110946280.5A CN113639740A (en) | 2021-08-18 | 2021-08-18 | Scanning shaft rotating method of conical scanning structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110946280.5A CN113639740A (en) | 2021-08-18 | 2021-08-18 | Scanning shaft rotating method of conical scanning structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113639740A true CN113639740A (en) | 2021-11-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110946280.5A Pending CN113639740A (en) | 2021-08-18 | 2021-08-18 | Scanning shaft rotating method of conical scanning structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN113639740A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514187A (en) * | 2019-08-30 | 2019-11-29 | 北京航空航天大学 | A kind of small field of view camera celestial north-finder technical method and device |
| CN112068130A (en) * | 2020-09-01 | 2020-12-11 | 上海卫星工程研究所 | Stationary orbit microwave imaging method and system based on whole-satellite two-dimensional scanning motion |
-
2021
- 2021-08-18 CN CN202110946280.5A patent/CN113639740A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514187A (en) * | 2019-08-30 | 2019-11-29 | 北京航空航天大学 | A kind of small field of view camera celestial north-finder technical method and device |
| CN112068130A (en) * | 2020-09-01 | 2020-12-11 | 上海卫星工程研究所 | Stationary orbit microwave imaging method and system based on whole-satellite two-dimensional scanning motion |
Non-Patent Citations (2)
| Title |
|---|
| 孙洪驰等: "一种临近空间飞行器动态拖尾星图复原方法", 《中国惯性技术学报》, vol. 29, no. 1, pages 77 - 83 * |
| 钱勇等: "基于模型预估方法补偿扫描镜运动对成像影响分析", 《弹箭与制导学报》, vol. 26, no. 3, pages 201 - 204 * |
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