Preprint Article Version 1 This version is not peer-reviewed

Signal-to-Noise Ration Evaluation of Luojia 1-01 Satellite Nighttime Light Remote Sensing Camera Based on Time Sequence Images

Version 1 : Received: 8 January 2019 / Approved: 9 January 2019 / Online: 9 January 2019 (15:43:53 CET)

How to cite: Wang, W.; Zhong, X.; Su, Z.; Li, D.; Zhang, G. Signal-to-Noise Ration Evaluation of Luojia 1-01 Satellite Nighttime Light Remote Sensing Camera Based on Time Sequence Images. Preprints 2019, 2019010088 (doi: 10.20944/preprints201901.0088.v1). Wang, W.; Zhong, X.; Su, Z.; Li, D.; Zhang, G. Signal-to-Noise Ration Evaluation of Luojia 1-01 Satellite Nighttime Light Remote Sensing Camera Based on Time Sequence Images. Preprints 2019, 2019010088 (doi: 10.20944/preprints201901.0088.v1).

Abstract

Signal-to-noise ratio (SNR) is an important index to evaluate radiation performance and image quality of optical imaging systems under low illumination background. Under the nighttime lighting condition, the illumination of remote sensing objects is low and varies greatly, usually ranging from several lux to tens of thousands of lux. Nighttime light remote sensing imaging requires high sensitivity and large dynamic range of detectors. Luojia 1-01 is the first professional nighttime light remote sensing satellite in the world. In this paper, we took the nighttime light remote sensing camera carried on the satellite as research object, proposed an in-orbit SNR test method based on time series images to overcome the problem of low spatial resolution. We first analyzed the process of luminous flux transmission between objects and satellite and established a radiative transfer model. By combining the parameters of large relative aperture optical system and high sensitivity CMOS device, we established SNR model and specially analyzed the effect of exposure time and quantization bits on SNR. Finally we used the proposed in-orbit test method to calculate SNR of lighting images acquired by satellite. And the measured result is in good agreement with the model predicted data. Under the condition of 10lx illumination, the SNR of typical objects can reach 27.02dB, which is much better than the requirement of 20dB for engineering application.

Subject Areas

signal-to-noise ratio; nighttime light imaging; time sequence images; Luojia 1-01; radiative transfer model; radiometric calibration; in-orbit test

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