A star sensor variable update rate image acquisition and processing unit and method

Abstract

The invention discloses an update-rate-variable image collection and treatment unit and method of a star sensor. The unit comprises a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a detector of the star sensor and an SRAM (Static Random Access Memory), wherein the FPGA comprises an RAM (Random Access Memory), a driving module and an image collection module; the CPU forms and writes a DUMP flag word into the RAM; the RAM transmits the DUMP flag word to the driving module; the driving module judges to generate a full frame output driving schedule or a DUMP output driving schedule according to the DUMP flag word, and transmits the full frame output driving schedule or the DUMP output driving schedule to the detector; the detector outputs a pixel gray level according to the full frame output driving schedule or the DUMP output driving schedule; the image collection module writes the pixel gray level into the SRAM. The update-rate-variable image collection and treatment unit and method are used for improving the parasitic-light-resistant capacity and the dynamic performance of the star sensor, decreasing the hardware cost of the star sensor and improving the data update rate of the star sensor.

Description

technical field [0001] The invention belongs to the field of star sensors, and in particular relates to a star sensor variable update rate image acquisition processing unit and method. Background technique [0002] For a star sensor, the detector is the most basic and important component. The image generated and transmitted by the detector is the basis for all subsequent work such as star point extraction, star map recognition, attitude calculation, etc., and also determines the The accuracy and data update rate of the entire star sensor. The quality of the driver timing design directly determines the work of the entire system. [0003] For a frame transfer CCD detector without an electronic shutter, a working cycle is divided into two stages: frame transfer and frame readout. The frame readout stage realizes the charge accumulation in the photosensitive area, and at the same time reads the charge in the storage area from the horizontal register line by line. out; the fram...

AI Technical Summary

Problems solved by technology

For CCD detectors without electronic shutters, if the DUMP drive mode is not used, the exposure time will be longer, which is not conducive to improving the anti-stray light ability and dynamic performance of the star sensor, and also restricts the data update rate of the star sensor

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