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Hartono, Rommy
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Aerospace Engineering Astronomy

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Journal : Indonesian Journal of Aerospace

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Image Quality Comparison of Filter Placement Effect on the LWIR Camera of LAPAN A4 Satellite Hartono, Rommy; Dede Ardianto; Syafrudin, A. Hadi
Indonesian Journal of Aerospace Vol. 22 No. 1 (2024): Indonesian Journal Of Aerospace
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/ijoa.2024.855

Abstract

The LAPAN A4 LWIR camera has already been installed with a bandpass filter, generating a spectral response whose value is near the spectral response of TIRS bands 10 and 11 of LANDSAT 8. Due to the small size of the mechanical part of the LWIR bandpass filter, which has a diameter of 32.5mm, a problem arises when installing the LWIR filter. The filter can be placed in four different positions inside the LWIR camera, and these four positions are also viable for capturing images. This paper aims to compare images generated from four possible filter placements on the LWIR camera using the LAPAN LWIR filter to obtain the best image quality from the LAPAN LWIR camera. To achieve optimal results from these four possible placements, statistical analyses such as standard deviation, SNR calculation, dynamic range, and spatial response area using a moving average filter are employed to assess image quality. Based on the tests and the analysis of signal-to-noise ratio and dynamic range, filter placements behind the zoom lens and in front of the focus lens are nearly identical and superior to those in front of the zoom lens and behind the focus lens. Conversely, the analysis of spatial response area using a moving average filter shows that the filter in front of the zoom and focus lens is superior to that behind the zoom lens. Therefore, the recommendation is to place the filter in front of the zoom and focus lens for the final assembly
KALIBRASI RADIOMETRI VICARIOUS KAMERA MULTISPEKTRAL SATELIT LAPAN-A3/IPB DI WILAYAH BUKIT JADDIH MADURA Salaswati, Sartika; Hakim, Patria Rachman; Syafrudin, A Hadi; Hartono, Rommy; Utama, Satriya; Herawan, Agus; Yatim, Rakhmat; Ardinal, Rifki; Pamadi, Bambang Sigit
Indonesian Journal of Aerospace Vol. 18 No. 1 Juni (2020): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2020.v18.a3212

Abstract

Satelit LAPAN-A3/IPB merupakan satelit mikro eksperimental yang memiliki misi penginderaan jauh sebagai salah satu misi utamanya. Dalam melaksanakan misi penginderaan jauh tersebut, satelit LAPAN-A3/IPB dilengkapi dengan muatan utama berupa kamera multispektral empat kanal (merah-hijau-biru-inframerah dekat) jenis pencitraan pushbroom dengan resolusi spasial 15 meter dan lebar sapuan 120 km serta resolusi radiometri 16 bit dan resolusi temporal 21 hari. Untuk menghasilkan data citra pengamatan yang memiliki kualitas standar setiap saat, salah satu kalibrasi yang harus dilakukan adalah kalibrasi radiometri vicarious yang dilakukan setelah satelit mengorbit. Penelitian ini menganalisis hasil kalibrasi radiometri vicarious untuk kamera multispektral satelit LAPAN-A3/IPB di wilayah bukit Jaddih Madura yang telah dilakukan pada tahun 2018 lalu. Dengan membandingkan data citra observasi yang dihasilkan satelit dan data radiansi hasil pengukuran lapangan dengan menggunakan spektrometer, diperoleh koefisien radiansi yang menyatakan hubungan antara data digital number citra kamera multispektral dengan data radiansi sensor ToA (Top-of-Atmosphere). Analisis yang telah dilakukan menunjukkan bahwa koefisien radiansi yang dihasilkan kalibrasi radiometri vicarious di bukit Jaddih Madura tidak berbeda jauh dengan koefisien radiansi yang dihasilkan pada beberapa kalibrasi radiometri vicarious sebelumnya. Analisis temporal juga menunjukkan bahwa koefisien radiansi yang dihasilkan dengan menggunakan data observasi bukit Jaddih pada periode waktu lainnya juga menghasilkan nilai koefisien radiansi yang sama. Hasil ini menunjukkan bahwa hasil kalibrasi radiometri vicarious yang dihasilkan cukup akurat. Walaupun demikian, akurasi kalibrasi radiometri vicarious yang dilakukan dapat ditingkatkan dengan menggunakan data atmosfer yang dihasilkan sensor sunfotometer.
Analysis of the Atmospheric Effects on the Vicarious Calibration of LAPAN-A3/IPB Satellite Multispectral Camera in Jaddih Hill Madura Salaswati, Sartika; Hakim, Patria Rachman; Syafrudin, A Hadi; Herawan, Agus; Hartono, Rommy; Utama, Satriya; Yatim, Rakhmat; Ardinal, Rifki; Pamadi, Bambang Sigit
Indonesian Journal of Aerospace Vol. 20 No. 1 (2022): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2022.v20.a3652

Abstract

Line Imager Space Application (LISA) is a multispectral camera on the LAPAN-A3/IPB satellite. This camera is the main payload that supports the remote sensing mission of the LAPAN-A3/IPB satellite. The important role of LISA requires this camera has a good quality standard. Vicarious calibration is one of the ways to get this quality. Vicarious calibration of LISA in the Jaddih hill area has been done, but the process has not used aerosol optical depth data. Therefore, further research was conducted to determine the effect of AOD data on the radiance coefficient. This paper describes the vicarious calibration of LISA using three types of data, namely LISA image data, reflectance data, and aerosol optical depth data of the Jaddih hill area. From the three data, the radiance coefficient for each LISA channel was obtained. The results show that there is an effect of AOD data on the radiance coefficient, but the effect is not too significant. The difference of the radiance coefficients for each channel is not too far away, that is 0.00008 for red channels, 0.00011 for green channels, 0.00039 for blue channels, and 0.00011 for NIR channels. Besides, the results of the radiance coefficient from previous studies indicate that the radiance coefficient is generated from this study is quite precise so that it can be applied for LISA imagery.
Co-Authors ardinal, rifki Dede Ardianto Hakim, Patria Rachman Herawan, Agus Muhammad Darsono Pamadi, Bambang Sigit Salaswati, Sartika Satriya Utama Syafrudin, A Hadi Syafrudin, A. Hadi Wijaya, Ahmad Ruri Yatim, Rakhmat