| Patent application number | Description | Published |
|---|
| 20080317283 | SIGNAL PROCESSING METHOD AND DEVICE FOR MULTI APERTURE SUN SENSOR - The disclosure relates to a signal processing method for multi aperture sun sensor comprising the following steps: reading the information of sunspots in a row from a centroid coordinate memory, judging the absence of sunspots in that row, identifying the row and column index of the sunspots in the complete row, selecting the corresponding calibration parameter based on the row and column index, calculating attitude with the attitude calculation module the corresponding to identified sunspots, averaging the accumulated attitude of all sunspots and outputting the final attitude. At the same time, a signal processing device for multi aperture sun sensor is also presented. It is comprised of a sunspot absence judgment and an identification module and an attitude calculation module. The disclosure implements the integration of sun sensors without additional image processor or attitude processor, reduces field programmable gate array resource and improves the reliability of sun sensors. | 12-25-2008 |
| 20090012731 | METHOD AND DEVICE FOR CALIBRATION OF DIGITAL SUN SENSOR - A method for calibration of a digital sun sensor is disclosed. The method comprises following steps. First, an integrated mathematic model for imaging of a sun sensor is established according to the external and internal parameters of the calibration system of the sun sensor. Next, the two axis of the rotator are rotated by different angles. Then, calibration points' data are acquired and sent to a processing computer through an interface circuit. Finally, a two-step calibration program is implemented to calculate the calibration parameters by substituting the calibration points' data to the integrated mathematic model. The disclosure also relates to an application device of the calibration method. The device comprises: a sun simulator to provide the incident sunlight, a two-axis rotator to acquire different the calibration points' data, and a processing computer to record the calibration points' data and calculate the calibration parameters. The calibration method and device apply to many kinds of digital sun sensors. By integrated external and internal parameters modeling, the disclosure improves calibration precision. Meanwhile, the whole calibration process is simplified because precise installation and adjustment is not required. | 01-08-2009 |
| 20090012734 | METHOD AND DEVICE FOR CALIBRATION OF DIGITAL CELESTIAL SENSOR - A method for calibration of a digital celestial sensor is disclosed. The method comprises the following steps: firstly, an integrated mathematic model for imaging of a celestial sensor is established according to external and internal parameters of the calibration system of the celestial sensor. Secondly, by rotating two axes of a rotator by different angles, calibration points data are acquired and sent to a processing computer through an interface circuit. Finally, a two-step calibration program is implemented to calculate the calibration parameters by substituting calibration points' data to the integrated mathematic model. The disclosure also relates to an application device of the calibration method, wherein the device comprises: a celestial simulator to provide simulated sunlight or starlight, a two-axis rotator to acquire different the calibration points' data, a processing computer to record the calibration points' data and calculate the calibration parameters. The calibration method and device apply to many kinds of digital celestial sensors. By integrating external and internal parameters modeling, the disclosure improves the calibration precision. Meanwhile, the whole calibration process is simplified because precise installation and adjustment is not required. | 01-08-2009 |
