Electrical excitation generation apparatus and method for static infrared earth sensor

Abstract

The invention discloses an electric excitation generating device and method for a static infrared earth sensor. The electric excitation generating device comprises an RS232 level switch module, a field programmable gate array (FPGA) core module, a digital-to-analogue conversion module and a summator module. A test computer inputs an instruction into the electric excitation generating device through the RS232 level switch module, and system configuration parameters are obtained through FPGA instruction analysis. Based on the system configuration parameters, the FPGA core module has two functions including real-time generation of index values of columns and rows of images and horizon circle drawing, and generates an analog image electric excitation signal through the digital-to-analogue conversion module. The electric excitation signal is overlaid with a detector background signal synchronously through the summator module to generate an electric excitation signal containing detector background information and used for ground performance testing of the infrared earth sensor. The electric excitation generating device and method for the static infrared earth sensor enables the performance testing of the infrared earth sensor to be comprehensive and reliable and is short in development period and convenient and flexible in testing and in use.

Description

technical field [0001] The invention relates to an electric excitation generating device and method for an earth infrared analog image, which is suitable for ground testing of a space-borne static infrared earth sensor. Background technique [0002] At present, the excitation signals used for ground testing of static infrared earth sensors are mainly divided into two types: electrical excitation and optical excitation. The principle of the electric excitation method is to convert the attitude angle of the satellite input into the test into the center position of the horizon circle in the field of view, and then draw a digital image of the horizon circle inside the processor for the ground test of the static infrared earth sensor The principle of the optical excitation method is to use the two-dimensional turntable to control the rotation of the earth simulator to simulate the deviation of the satellite's attitude towards the earth in orbit; the temperature control system is ...

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Problems solved by technology

[0003] The traditional electrical excitation signal generation method is simple, flexible, easy to implement, and has a wide range of test coverage. However, this electrical excitation signal generation method can only obtain digital test signals, and does not take into account the non-uniformity of the infrared detector and the impact of system noise on the infrared earth. The impact of sensor ground testing is generally only applicable to the initial commissioning phase and functional testing of infrared earth sensors

[0004] The ground test based on the optical excitation method can truly simulate the infrared radiation signal of the horizon circle, and can simultaneously test the influence of the non-uniformity of the infrared detector and the noise on the ground test of the infrared earth sensor, making the ground test data more reliable; but the optical excitation The method needs to develop a whole set of ground test equipment, which has a long development cycle, complex production, and bulky volume, which makes it difficult to carry and carry in field experiments, and the test range of each set of equipment is limited, and can only cover a certain range of test conditions. More suitable for performance testing of infrared earth sensors in laboratory environments

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