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The crashworthiness of an automobile and the survivability of its passengers in road accidents are of paramount importance to the automobile industry. Thus the designers in making automobiles have focused increased attention on designing a car, which provides greater protection for the drivers and the passengers in case of an accident. Before a new model is launched into the market, a complete collision...
Selection of guidance law is an important factor that affects the tactical performance of surface to air missiles. In order to select a suitable guidance law, a method of comparing the normal available acceleration with demanded or required acceleration is formulated. Two guidance laws i.e., proportional navigation guidance law (PNC) and augmented proportional navigation guidance law (APNC) are tested...
This paper presents performance comparison of three speed control schemes (engine throttle control) for LAV applications. First scheme uses fixed throttle levels (three levels for cruise climb and descend) however no speed feedback was used in the control loop. Second scheme also uses fixed throttle levels however number of levels are increased and switching is performed based on speed feedback using...
The stochastic models of attitude estimation errors for vehicle moving near to the rough surface are presented. These models are suitable for solving the task of perfection of stabilization and motion control algorithms for the vehicle motion at the disturbed sea.
This note focuses on the robust asymptotic stabilization of linear uncertain dead time systems with state delay using the strategy of dynamic memoryless controller.
Transmission control protocol (TCP) is used for reliable data transfer on the Internet today and has been carrying more than 90% of the Internet traffic. One of its main strengths is its use of flow control algorithms that allows TCP to reduce the rate at which it sends data if network congestion is encountered. TCP multi-home option makes it possible to handle multiple local and remote address pairs...
In this paper, characterization of waveguide slots in an FEM based EM analysis software has been discussed. Characterization has been done for longitudinal broad wall radiating slot and centered-inclined broad wall coupling slot. Using this characterization, a Ku band 8 times 8 planar array antenna has been designed with Elliot's design equations. Its performance was first checked in an FEM analysis...
This article focuses on trace back unit of Viterbi algorithm for constraint length K = 7. Conventional trace back unit comprises of three types of memory operations: decision bits write, trace back read & decode read whereas the pre-trace back approach exploits the inherent parallelism between the decision bits write & decode traceback operation. This approach results in reduction in latency...
One of the critical blocks in OFDM based transmitter is its power amplifier and the design is aimed for high linearity with maximum power efficiency. This paper describes the design and fabrication of S-band solid state high power amplifier using GaAs power MESFET device for OFDM transmitters. The amplifier operates at center frequency of 2.3 GHz with a bandwidth of 200 MHz. The typical output power...
Planar slotted waveguide antennas usually have their main-beam pointed perpendicular to the antenna aperture. While this arrangement is most practical and convenient from design point of view, it suffers a serious setback in that it offers large RCS in the direction of antenna main-beam. This paper presents the design and testing of an offset-beam antenna for low RCS applications. A linear traveling...
This paper describes the design, development and testing of an X-band frequency synthesizer. The synthesizer consists of a voltage-controlled oscillator (VCO), a phase-locked loop (PLL) circuit and a reference oscillator. Commercially available components used in the design provide a low cost and short time to market solution. Typical output power of the synthesizer is +10 dBm. Loop filter is designed...
The pulse input Class C power amplifier response of an enhanced version of a previously fabricated and tested SiC MESFET 11 are studied using a new technique to its physical model in TCAD. The device is simulated at 5% duty cycle pulse for Gain (dB), Power density (W/mm), power loss and power added efficiency (PAE %) at 500 MHz and 1 GHz. The results are then correlated to the device features in DC...
Hardware in the loop (HIL) simulations are being increasingly employed for rapid control prototyping, calibration and validation of the electronic control units. The stringent timing requirements and high development time arc the main challenges in HIL simulation. The strict timing requirements demand a hard real-time operating system which is reliable, robust and deterministic in nature. In this...
This paper proposes and investigates an automated robot-based system for the insertion of self-tapping screws into some holes. The system consists of three main components: a) a manipulator-guided screwdriver, b) a camera, and c) a system which controls and monitors the overall process. As approximately a quarter of assembly operations in the manufacture of commercial products are screw insertions,...
This paper considers the stabilization problem of inertial-wheel pendulum, a widely studied nonlinear mechanical system. Inertial wheel pendulum is classical example of a flat underactuated mechanical system. The design of control laws for underactuated mechanical systems are challenging because of their underactuated nature, posing problems in exact feedback linearization. A novel nonlinear controller...
Universal Mobile Telecommunication System (UMTS) is a third generation mobile communication technology based on wideband CDMA (WCDMA) and can facilitate the users in much better way as compared to the second generation of mobile communication. UMTS is superior to second generation in terms of bandwidth efficiency, quality of service, speech quality, speed and capacity. At present, more than 60 countries...
The ever-growing demand of higher data rates is pushing the modern wireless communication systems towards millimeter wave frequency band (30-300 GHz). At these frequencies the available bandwidth is much larger, resulting into increased data rates. Thus, there is a growing demand of efficient antennas operating at these high frequencies. This paper deals with the design of linear and planar resonant...
The equipotential geoid of the gravity field of the Earth can be modeled with different formulation of the geodetic boundary value problems and their solutions. These techniques range from Helmert's 2nd method of condensation to Residual terrain modeling and then to the Molodenskij solution of the geodetic boundary value problem. The available data for gravity anomalies, elevation and their distribution...
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