Indonesian National Institute of Aeronautics and Space

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    A study of the partial acquisition technique to reduce the amount of SAR data

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    Synthetic Aperture Radar (SAR) technology is capable to provide high resolution image data of earth surfaces from a moving vehicle. This causes large volumes of raw data. Many researchs were proposed about compressed radar imaging, which can reduce the sampling rate of the analog digital converter (ADC) on the receiver and eliminate the need of match filter on the radar receiver. Besides the advantages, there is a major problem that produces a large measurement matrix, which causes a very intensive matrix calculation. In this paper is studied a new approach to partial acquisition technique to reduce the amount of raw data using compressed sampling in both the azimuth and range and to reduce the computational load. The results showed that the reconstruction of SAR image using partial acquisition model has good resolution comparable to the conventional method (Range Doppler Algorithm). On a target of a ship, that represents a low level sparsity, a good reconstruction image could be achieved from a fewer number measurement. The method can speed up the computation time by a factor of 2.64 to 4.49 times faster than with a full acquisition matrix.6 hl

    Publikasi Ilmiah LAPAN Menggunakan e-journal

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    Hlm. 29-3

    BULETIN LAPAN Vol.4. No.2 Tahun 2017

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    54hlm.,ill.;30c

    Proses Produksi Struktur Pesawat tanpa Awak/UAV: Studi Kasus Vertical Tail LSU-03

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    xii, 79hlm.,ill.;21 c

    Performa SENTANU

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    Hal. 17-1

    Keterbukaan Informasi Publik Dorong Eksistensi Institusi

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    Hal. 28-2

    Pengaruh Iklim Terhadap Penurunan Tinggi Muka Air Danau Toba

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    Kawasan Danau Toba adalah kawasan strategis nasional yang memiliki peran multi sektor, baik bagi kepentingan masyarakat lokal, nasional bahkan internasional. Wilayah Danau Toba adalah pusat kepariwisataan di Sumatera Utara, yang sudah dikenalhingga mancanegara. Pada tahun 2016 telah terjadi penurunan tinggi muka air Danau Toba hingga 1.5-2 m, kondisi ini menyebabkan berkurangnya debit air Danau Toba,hal ini cukup mengganggu pasokan air untuk PLTA. Dalam kajian ini dilakukan analisis terkait parameter iklim khususnya curah hujan di Daerah Tangkapan Air Danau Toba yang diwakili oleh 15 stasiun/pos iklim dengan periode data tahun 1981-2016. Dilakukan analisis statistik untuk mengolah data curah hujan dan tinggi muka air Danau Toba. Terjadi hubungan yang signifikan antara curah hujan dan tinggi muka air Danau Toba dengan korelasi berkisar antara 0.2-0.7. Pada tahun 2016 terjadi penurunan curah hujan yang signifikan hingga 31% terhadap normalnya.Penurunan curah hujan berkontribusi terhadap penurunan tinggi muka air Danau Toba.Hlm116-12

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