In this thesis, the pulse diversity technique in radar systems in high clutter environments is investigated. In this technique, different pulse compression methods are used in each pulse in the transmitted burst to increase the unambiguous range. In pulse diversity, the design of filters used in the receiver is as important as designing the transmitted waveform. At the output of pulse-burst filter that processes pulse-by-pulse, as many channels as the pulses in the burst occur. Each of these channels is matched to a certain range interval. In order to improve the detector performance, the phase codes used in the transmitted pulse-burst waveform and their corresponding filters must have good auto-correlation and cross-correlation properties, either individually or as their sum. In the literature some phase codes, having mentioned properties, are present. However, the performance of these codes in radar applications is not fully evaluated. The studies in the thesis show that the codes in the literature cannot be used directly in radar applications. In the scope of thesis, optimization criteria suitable for radar applications are defined and applied according to the mentioned requirements. Then, the obtained phase codes are tested in the radar simulator and the obtained results of the simulations are evaluated.

In this thesis, co-design and co-verification of a microcontroller hardware and software using SystemC is studied. For this purpose, an MC68HC11 microcontroller unit, a test bench that contains input and output modules for the verification of microcontroller unit are implemented using SystemC programming language and a visual simulation program is developed using C# programming language in Microsoft .NET platform. SystemC is a C++ class library that is used for co-designing hardware and software of a system. One of the advantages of using SystemC in system design is the ability to design each module of the system in different abstraction levels. In this thesis, test bench modules are designed in a high abstraction level and microcontroller hardware modules are designed in a lower abstraction level. At the end, a simulation platform that is used for co-simulation and co-verification of hardware and software modules of overall system is developed by combining microcontroller implementation, test bench modules, test software and visual simulation program. Simulations at different levels are performed on the system in the developed simulation platform. Simulation results helped observing errors in designed modules easily and making corrections until all results verified designed hardware modules. This stuation showed that co-designing and co-verifying hardware and software of a system helps finding errors and making corrections in early stages of system design cycle and so reducing design time of the system.

Flight simulators are widely used by the military, civil and commercial aviation. Visual cues are an essential part of helicopter flight. The required cues for hover are especially large due to closeness to the ground and small movements. In this thesis, density and height parameters of the 3D (Three Dimensional) objects in the scene are analyzed to find their effect on hovering and low altitude flight. An experiment is conducted using a PC-based flight simulator with three LCD monitors and flight control set. Ten professional military pilots participated in the experiment. v Results revealed that object density and object height are effective on the horizontal and vertical hovering performance. There is a peak point after which increasing the density does not improve the performance. In low altitude flight, altitude control is positively affected by smaller object height. However, pilots prefer the scenes composed of the high and mixture objects while hovering and flying at low altitude. Distance estimation is affected by the interaction of the object density and height.

<p>In this thesis work I have been working with two traffic simulators called Hank and ST Software. Hank is a research tool at the University of Iowa and ST Software is a commercial product. To evaluate which of these is the most suitable for behavior research I have implemented three types of intelligent agents: Overtaking Agent, Traffic Light Agent and Meeting Agent. The thesis work was extended by adding the possibility for realistic human behavior to the agents.</p><p>The result indicated that Hank allowed for greater control over behavior while ST Software allowed for faster and easier implementation.</p>

<p>The purpose of this thesis is to design a motion simulator for a rallycross racing environment. The focus on the design is how to mechanically create the G-forces and to model them. After that is done the visually seen motion has to be electronically implemented into the motion simulator, creating as realistic as possible an experience for the driver. A program called Aprot is written in National Instruments Labview to handle the communication between the software simulator and hardware signals. Alot of focus is paid on how to represent the much larger G-forces that are experienced on a real track in the limited capacity that a motion simulator allows. For this purpose several formulas are proposed, all of which have their benefits. The simulation environment used is Racer, a well documented racing simulation that is still in development by the creator Ruud van Gaal. Aprot continuously reads specific data from a file in Racer and uses the formulas to form them into reference values for mechanics. Aprot also has a PID-controller, so that the piston positioning can be optimized.</p><p>The original plan of this master thesis was to use Aprot on a full-scale pneumatic or hydraulic prototype. However, due to time and money constraints, this was not done, leaving this work as a theoretical base on which to build upon.</p>

<p>This report is about a Thesis for Degree of Bachelor of Science at Linköping University. It describes design of equipment which makes it possible to measure signal and noise quality during data transmission via Asymmetric Digital Subscriber Line, ADSL. The measuring instrument is HP 4934A Transmission Impairment Measuring Set. The equipment was supposed to be used for testing of ADSL systems within Solectron Sweden AB. In fact, the equipment stands for virtual Plain Old Telephone Service, POTS. That is why it simulates all three states that may come up. The states are following:"on hook", ringing,"off hook"(speech transmission). There is a control unit in the design. It changes between different circuit connections to get one of the states. You have to use a computer for control of the equipment. The computer commands are sent to equipment via its serial port via RS232 to the control unit. The equipment is driven with 48 Vdc.</p>

<p>En del av en Audioanalystor har blivit utveckladoch implementerad som en applikation i det hårdvarubeskrivande språket VHDL. Denna del har sedan programmerats in i en PLD-krets på ett kretskort som används i audiotester för mobiltelefoner på Flextronics. Applikationen konverterar data så att det ska gå att skicka information mellan telefonen och olika mätinstrument. Applikationen består av två äldre applikationer. Av dessa två har en blivit helt implementerad. I den andra kvarstår att finna orsaken till varför den ger ifrån sig felaktigt data i form av oönskat brus. Arbetet avbröts p.g.a. slutdatum. A part of an audio analyzer has been developed and implemented as an application in the hardware description language VHDL. This part has later been programmed into a PLD device on a circuit board used for audio tests on mobile telephones at Flextronics. The application converts data, making it possible to send information between the telephone and different measuring instruments. The application consists of two older applications. One of them has been fully implemented. What is left in the other part is to find the cause why it is sending wrong data as unwanted noise. The work had to be stopped when deadline was reached</p> / <p>A part of an audio analyzer has been developed and implemented as an application in the hardware description language VHDL. This part has later been programmed into a PLD device on a circuit board used for audio tests on mobile telephones at Flextronics. The application converts data, making it possible to send information between the telephone and different measuring instruments. The application consists of two older applications. One of them has been fully implemented. What is left in the other part is to find the cause why it is sending wrong data as unwanted noise. The work had to be stopped when deadline was reached.</p>

<p>At Saab Aerospace in Linköping, components for measurement systems to the fighter aircraft JAS 39 Gripen are developed. In this activity you sometimes want to record the traffic transmitted on the data busses that connects different sys-tems. This traffic on the data busses is using the military standard MIL-STD-1553. </p><p>This project has aimed to create a system for recording and sending 1553-data. The system is used on an ordinary personal computer, equipped with a recon- figurable I/O card that among others has a programmable logic circuit (FPGA). The recorded data are stored on a hard drive. The system has a graphical user interface, where the user can configure different methods of filtering the data, and other preferences. </p><p>The completed system has currently the capacity to record one channel. This works excellent and the system basically meets all the requirements stated at the start of the project. By using this system instead of the commercial available systems on the market one will get a competitive alternative. If the system where to be developed further, with more channels, it would get even more price worth. Both in case of price per channel, but also in functionality. This is because it is possible to design exactly the functions the user demands. But the current version is already fully functional and competitive compared to commercial systems.</p>

<p>The automotive field is becoming more and more complex and cars are no longer just pure mechanical artifacts. Today much more than 50 % of the functionality of a car is computerized, so, a modern car system is obviously based on mixed technologies which emphasize the need for new approaches to the design process compared to the processes of yesterday. A corresponding technology shift has been experienced in the aerospace industry starting in the late sixties and today aircraft could not fly without its computers and the pilots’ environment has turned to a so called glass cockpit with no iron-made instrumentation left. A very similar change is still going on in the automotive area.</p><p>Simulator-Based Design (SBD) refers to design, development and testing new products, systems and applications which include an operator in their operation. Simulator-Based Design has been used for decades in the aviation industry. It has been a common process in this field. SBD may be considered as a more specific application of simulation-based design, where the specific feature is a platform, the simulator itself. The simulator could consist of a generic computer environment in combination with dedicated hardware components, for instance a cockpit. This solution gives us the possibility of including the human operator in the simulation.</p><p>The name of the project is Simulator-Based Design in Practice. The purpose of this master thesis is to get a complete practice in how to use a human-in-the-loop simulator as a tool in design activities focusing on the automotive area. This application area may be seen as an example of systems where an operator is included in the operation and thus experience from the car application could be transferred to other areas like aviation or control rooms in the process industry.</p><p>During the performance of the project we have gone through the main parts of the SBD process. There are many steps to complete the whole cycle and many of them have iterative loops that connect these steps with the previous one. This process starts with a concept (product/system) and continues with a virtual prototyping stage followed by implementation, test design, human-in-the-loop simulation, data analysis, design synthesis and in the end a product/system decision. An iterative process approach makes the cycle flexible and goal oriented.</p><p>We have learnt how to use the simulator and how to perform the whole cycle of SBD. We first started getting familiar with the simulator and the ASim software and then we were trying to reduce the number of computers in the simulator and changing the network in order to find good optimization pf the computer power. The second step has been to implement a new application to the simulator. This new application is the rear mirror view and consists of a new LCD monitor and the rear view vision that must be seen in the new monitor. Finally we updated the cockpit to the new language program Action Script 3.0.</p><p>The information gathering consisted of the course Human-System interaction in the University, the introduction course to ASim software and the course of Action Script 3.0.</p>

Many physical and algorithmic swarms utilize inter-agent communication to achieve advanced swarming behaviors. These swarms are inspired by biological swarms that can be seen throughout nature and include bee swarms, ant colonies, fish schools, and bird flocks. These biological swarms do not utilize inter-agent communication like their physical and algorithmic counterparts. Instead, organisms in nature rely on a local awareness of other swarm members that facilitates proper swarm motion and behavior. This research aims to pursue an effective swarm algorithm using only line-of-sight proximity information and no inter-agent communication. It is expected that the swarm performance will be lower than that of a swarm utilizing inter-agent communication. Various sensors were studied and considered for this project but infrared sensors were ultimately selected. These sensors were then modeled in software using a neural network in order to calculate the minimum number of infrared transmitters and receivers necessary for each agent while still ensuring the proper functionality of the swarm. A physical swarm was designed and constructed using the selected number and type of infrared sensors, DC stepper motors, a 16-bit microprocessor, and additional infrared proximity sensors. The performance of the physical robots was compared to the performance of the simulated robots under similar conditions. It was observed that the physical and simulated swarms performed similarly and that swarm behavior with no inter-agent communication was successfully achieved.