Evaluasi Efek Narrowband Jamming pada Radar CC(Circulating Code) OFDM(Orthogonal Frequency Division Multiplexing) Mimo(Multiple Input Multiple Output)

Ariawan, Aliflandt Tara Putra (2026) Evaluasi Efek Narrowband Jamming pada Radar CC(Circulating Code) OFDM(Orthogonal Frequency Division Multiplexing) Mimo(Multiple Input Multiple Output). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Radar CC (Circulating Code) OFDM (Orthogonal Frequency Division Multiplexing) MIMO (Multiple Output Multiple Input) merupakan radar berbasis OFDM yang menerapkan teknik circulating code antar elemen array, namun rentan terhadap narrowband jamming yang memusatkan energinya pada pita frekuensi sempit sehingga performa deteksi dan estimasi parameter target dapat terdegradasi. Penelitian ini bertujuan mengevaluasi pengaruh narrowband jamming terhadap akurasi estimasi parameter target serta probabilitas deteksi dan false alarm pada radar CC-OFDM MIMO, dan menguji efektivitas tiga teknik mitigasi: subcarrier removal, adaptive filtering berbasis NLMS, dan spatial nulling berbasis LCMV. Sistem disimulasikan pada MATLAB dengan frekuensi 3 GHz, bandwidth 20,48 MHz, 101 modul T/R, dan 63 beam dengan Taylor tapering. Evaluasi dilakukan dalam dua tahap: pengujian mitigasi pada JSR 10 dB, dan evaluasi Monte Carlo 300 iterasi untuk variasi JSR 0 hingga 60 dB pada metrik Probability of Detection ($P_d$), Probability of False Alarm ($P_{fa}$), SINR, serta error estimasi. Hasil simulasi menunjukkan sistem mengestimasi seluruh parameter target secara akurat tanpa jamming (error jarak 3,42 m, sudut 0,16°). Narrowband jamming menurunkan performa secara signifikan dengan zona kritis pada JSR 15–25 dB, di mana $P_d$ menurun tajam dari 1,000 menjadi 0,577. Pada JSR 10 dB, spatial nulling memberikan perbaikan SINR terbesar (19,75 dB), diikuti subcarrier removal (12,52 dB) dan adaptive filtering (7,87 dB).
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Radar CC (Circulating Code) OFDM (Orthogonal Frequency Division Multiplexing) MIMO (Multiple Output Multiple Input) is an OFDM-based radar that applies a circulating code technique between array elements, but is susceptible to narrowband jamming that concentrates its energy in a narrow frequency band so that the detection performance and target parameter estimation can be degraded. This study aims to evaluate the effect of narrowband jamming on the accuracy of target parameter estimation as well as the probability of detection and false alarm on the CC-OFDM MIMO radar, and test the effectiveness of three mitigation techniques: subcarrier removal, NLMS-based adaptive filtering, and LCMV-based spatial nulling. The system is simulated in MATLAB with a frequency of 3 GHz, a bandwidth of 20.48 MHz, 101 T/R modules, and 63 beams with Taylor tapering. The evaluation is carried out in two stages: mitigation testing at 10 dB JSR, and Monte Carlo evaluation of 300 iterations for JSR variations from 0 to 60 dB on the metrics of Probability of Detection ($P_d$), Probability of False Alarm ($P_{fa}$), SINR, and estimation error. Simulation results show that the system estimates all target parameters accurately without jamming (distance error 3.42 m, angle 0.16°). Narrowband jamming significantly degrades performance with a critical zone at JSR 15–25 dB, where $P_d$ decreases sharply from 1.000 to 0.577. At JSR 10 dB, spatial nulling provides the largest SINR improvement (19.75 dB), followed by subcarrier removal (12.52 dB) and adaptive filtering (7.87 dB).

Item Type:	Thesis (Other)
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5102.9 Signal processing. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5103.484 Orthogonal frequency division multiplexing. T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication
Divisions:	Faculty of Intelligent Electrical and Informatics Technology (ELECTICS) > Telecommunication Engineering > 20202-(S1) Undergraduate Thesis
Depositing User:	Aliflandt Tara Putra Ariawan
Date Deposited:	28 Jul 2026 02:45
Last Modified:	28 Jul 2026 02:45
URI:	http://repository.its.ac.id/id/eprint/138242

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