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This paper illustrates the concept of a low cost fixed wing flying Testbed, using only off the shelf components. Simulation results are nowadays excessively used to develop and test software for unmanned aerial vehicles. However, not every aspect of a real flight can be modelled adequately, which can pose a problem during a possible maiden flight. We want to propose a low cost flying testbed, which...
We have since last year been designing a IR Micro Bolometer which aims to contribute to mitigate of natural disasters, e.g., wild fire, volcano, Earthquake, and so on, possessed by Indonesia. Triggered by Indonesia location as a part of ring of fire, the analysis of volcano activity has been become our mission after completing wild fire work. It was also supported by the fact that space-based sensors...
Recently, to realize autonomous functions resembling those of humans on space systems, higher-performance embedded systems than those of current space systems are necessary for use in long-distance space missions. Currently, a parallel-operation-oriented optically reconfigurable gate array (ORGA) has been under development. The ORGA can support a nanosecond-order high-speed reconfiguration and high-density...
Satellite based automatic identification system (AIS) is currently being investigated as a remote traffic monitoring system for global maritime surveillance. Because of it being a TDMA based communication system, large number of ships using same communication channel comes under the big field of view (FOV) of the satellite leading towards collisions of the transmissions. This causes the reception...
This paper studies the design of two stage microwave low noise amplifier (LNA) for coastal radar application at S-band operation. The cascade amplifier configuration and double stub matching networks are applied in this design which is aimed to obtain high gain with minimum reflected RF power. The first stage uses E-pHEMT GaAs FET of ATF-551M4 type and the second one uses RF transistor of BFP740FESD...
In this paper, a modified fractal sierpinski patch antenna suitable for multiband wireless application is proposed. Various heights of a triangle component in sierpinski antenna are compared to achieve the desired resonant frequencies and then a coplanar wave guide feed is used to achieve more multiband resonant frequencies within 0-7 GHz frequency range. Return loss characteristics suggest that the...
In this paper, we have analyzed the spatial correlation statistics of different antenna polarization setups for uniform linear and circular antenna arrays. We have compared correlation statistics of different MIMO orders. We are motivated to understand pair-by-pair correlation behavior of MIMO channel as it plays a vital role in defining the channel spectral efficiency. We have further evaluated the...
Regional wind possession that experienced low wind study gives challenged the researcher in recognizing high spatial behavior of wind. Current practices of wind direction retrieval involved the derivation of wavelet coefficient through wavelet decomposition and wavelet transform in Fourier window of satellite images. However, mentioned technique underestimate wind streak of low wind speed where most...
A satellite simulator is needed in the development of satellite system and subsystems development, for simulating the conditions of the satellite operation. It is also used in the training of satellite operators. Software-based satellite simulator has been known to reduce the risk and cost of satellite development, mainly since the design validation can be done without having to develop costly hardware...
In common satellite image preprocessing, quality of radiometric and geometric correction play important roles in producing a high quality image. Both radiometric and geometric correction needs accurate calibrated camera parameters. This paper presents the analysis of radiometric calibration that has been done on matrix imager of LAPAN-A3 satellite payload. In this research, radiometric process of...
This article describes a new version of the Modular Airborne Camera System (MACS) [1], which has been made especially for maritime applications. The system is a successor to a High Altitude Long Endurance (HALE) MACS system which was operated in the Himalayas in 2014 [2]. Scenarios in the maritime environment require a different constellation of sensor heads, as shown in this paper. Furthermore, a...
This paper describes a brief description of Orthogonal Frequency Division Multiplexing (OFDM) waveform design and parameter for submarine radars. The radar works when the submarine is floating on the sea surface and it uses a radio frequency signal to detect multiple moving objects in the surrounding area. The OFDM parameters discussed here are including the carrier frequency, number of sub-carriers,...
Curved approaches are recently gaining importance in research due to economic and ecologic reasons since modern navigation aids facilitate this approach type. The mathematical expression of these approaches is thereby of special interest as continuous differentiability is especially important in this flight phase. This paper presents a method to intersect between straight legs using Bezier curves...
Wireless Avionics Intra-Communication (WAIC) is the standard of future avionics communications systems, aimed to substitute wired-communication in a single aircraft. The WAIC systems are designed for enhancing the efficiency and reliability communications systems of the aircraft. Currently, the standardization issue is focused on the allocated frequency band. The frequency of 4.2 – 4.4 GHz will be...
Recently, radiation-hardened static random access memory (SRAM) - based field programmable gate arrays (FPGAs) are available for use in space radiation environments. Although such radiation-hardened SRAM-based FPGAs are programmable, the uses of radiation-damaged SRAM-based FPGAs are not allowed as well as application specific integrated circuits (ASICs). Their serial configuration is invariably damaged...
The present paper presents a trajectory generation approach for a nonlinear dynamic inversion controller using second order error dynamics. The trajectory generation module provides an approach for 3D-trajectories with speed contraints including the determination of the trajectory reference point, the relative kinematics and the determination of the first derivatives of the deviation between unmanned...
There have been so many research works on the SAR (Synthetic Aperture Radar) image generation using EM (Electro Magnetic) simulation. Particularly, there are several dedicated S/Ws for SAR image generation and analysis. But, most of them are not available to the public due to the reason for defense and security. In this paper, we describe the generation of SAR images for a realistic target model using...
For low altitude unmanned aerial vehicle (UAV) applications, because of the strong atmosphere turbulence, the flight track and velocity may seriously deviate from the predetermination. This may cause severe degradation for achieving the expected performance of the UAV system. In this paper, we mainly focus on UAV-Radar applications, and a novel approach for estimating the drone�s forward velocity...
This article paper proposes a variation of the augmented proportional navigation law, called combined augmented proportional navigation which is studied to intercept a non-maneuvering target. This law is constructed from two predecessor laws, augmented proportional navigation (APN) known for its superiority performance against such target and coupled with combined proportional navigation (CPN) which...
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