Electronic star simulator for APS star sensor

Abstract

The invention relates to an electronic star simulator for an APS (Active Pixel Sensor) star sensor, which comprises a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an RAM (Random Access Memory) and an LVDS (Low Voltage Differential Signaling) interface circuit. The DSP receives posture data of the APS star sensor, which is input from the outside, and calculates to generate a star chart; then star chart data is stored in the RAM by the FPGA; and by the LVDS interface circuit, the FPGA outputs the star chart data stored in the RAM. The electronic star simulator generates the dynamic star chart and simulates an image output by a star sensor probe to excite a star sensor circuit box. The electronic star simulator is not provided with a complex optical system, does not need to be machined under high accuracy, and also does not need to be accurately installed when in use; the electronic star chart output by the electronic star simulator has high accuracy of positions of star points; and the electronic star simulator can be used for testing a subsystem, an integral star and a target range.

Description

technical field [0001] The invention relates to an electronic starry sky simulator for an APS star sensor, which belongs to the field of ground test and research of satellite control subsystems. Background technique [0002] Attitude sensors currently used by satellites mainly include earth sensors, sun sensors, gyroscopes, and star sensors. The gyroscope measures the relative attitude and must have an initial value when determining the attitude. Earth, sun, and star sensors measure attitude directly. Earth sensors generally measure roll and pitch attitudes; sun sensors generally only measure two-axis attitudes, and a combination of multiple sun sensors can achieve three-axis attitude measurements; star sensors measure three-axis attitudes. The earth sensor and the sun sensor can only measure the attitude in the whole sky when the earth or the sun enters the field of view, and the star sensor can realize the attitude measurement of the whole sky. The advantages of star se...

AI Technical Summary

Problems solved by technology

The dynamic starry sky simulator is difficult to miniaturize, requires high installation accuracy, complex installation mechanism, and high cost. It can be used for sub-system testing, and it is difficult to test the entire star and range.

[0006] Existing electronic starry sky simulators are generally implemented by PCs and expansion boards, which are large in size, complex in structure, not stable in operation, and low in star point accuracy, which cannot meet the requirements

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