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1	Utgångshastighetsmätning av granater med dopplerradar för granatgeväret Carl Gustaf / Exit Velocity Measurement of Grenades with Doppler Radar for Grenade Launcher Carl Gustaf Starck, Anton, Adell, Marcus January 2018 (has links) Det här projektet genomfördes på Saab Dynamics AB, Karlskoga. Syftet med projektet var att utvärdera möjligheterna att använda en 24 GHz Dopplerradarsensor för automotive-industrin, vid mätning av utgångshastigheten för projektiler från granatgeväret Carl Gustaf. Mätning av utgångshastigheten är av intresse för att öka träffsäkerheten med projektilerna. Projektet är huvudsakligen teoretiskt, dvs inga skarpa tester utfördes. Slutsatserna som dras grundar sig på beräkningar för mätning med radar och de matematiska problem de för med sig. Resultatet visar att denna radartyp är kapabel att mäta granater som färdas i höga hastigheter. Eftersom radar mäter radiell hastighet och radarmodulen ej kan placeras i linje med projektilen, behöver den uppmätta hastigheten korrigeras. Det söktes efter en lösning att korrigera detta i realtid eller genom efterbehandling av inläst data. En sådan blev dock ej funnen. Av de utforskade alternativen var den realiserbara lösningen på detta problem att montera radarmodulen så att felet i uppmätt hastighet blir försumbart. / This project was carried out at Saab Dynamics AB, Karlskoga, Sweden. The purpose of the project was to evaluate the possibilities to use a 24 GHz Doppler sensor made for the automotive industry to measure the exit velocity of projectiles from the grenade launcher Carl Gustaf. Measuring the exit velocity is of interest to increase the accuracy of the projectiles. The project is mainly theoretical, i.e. no live testing was performed. The conclusions drawn are based on calculations for measurement with radar and the mathematical problems they create. The result shows that this radar type is capable of measuring grenades travelling at high velocities. Since radar measures radial velocity, and the radar module cannot be placed in line with the projectile, the measured speed needs to be corrected. It was attempted to create a solution to correct this in real time or through post processing of the submitted data. A solution to this problem was, however, not found. Of the options explored, the realizable solution was to mount the radar so that the error in measured speed becomes negligible. Grenade launcher Exit velocity Doppler sensor Granatgevär utgångshastighet dopplerradar Computer Sciences Datavetenskap (datalogi)
2	Evaluation of FMCW Radar Jamming Sensitivity Snihs, Ludvig January 2023 (has links) In this work, the interference sensitivity of an FMCW radar has been evaluated by studying the impact on a simulated detection chain. A commercially available FMCW radar was first characterized and its properties then laid the foundation for a simulation model implemented in Matlab. Different interference methods have been studied and a selection was made based on the results of previous research. One method aims to inject a sufficiently large amount of energy in the form of pulsed noise into the receiver. The second method aims to deceive the radar into seeing targets that do not actually exist by repeating the transmitted signal and thus giving the radar a false picture of its surroundings. The results show that if it is possible to synchronize with the transmitted signal then repeater jamming can be effective in misleading the radar. In one scenario the false target even succeeded in hiding the real target by exploiting the Cell-Averaging CFAR detection algorithm. The results suggests that without some smart countermeasures the radar has no way of distinguishing a coherent repeater signal, but just how successful the repeater is in creating a deceptive environment is highly dependent on the detection algorithm used. Pulsed noise also managed to disrupt the radar and with a sufficiently high pulse repetition frequency the detector could not find any targets despite a simulated object in front of the radar. On the other hand, a rather significant effective radiated power level was required for the pulse train to achieve any meaningful effect on the radar, which may be due to an undersampled signal in the simulation. It is therefore difficult based on this work to draw any conclusions about how suitable pulsed noise is in a non-simulated interference context and what parameter values to use. FMCW FMCW radar radar frequency-modulated radar noise jamming FMCW Jamming Jamming Pulse Train Pulse Jamming Spoofing Attack Spoofing Deception Repeater Jamming Repeater Automotive Radar CFAR sensor jamming constant false alarm rate electronic warfare EW FMCW FMCW radar frekvensmodulerad dopplerradar dopplerradar radar brusstörning radarstörning pulsstörning pulståg falskmål vilseledning repeterstörning bilradar sensorstörning CFAR Annan elektroteknik och elektronik

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Utgångshastighetsmätning av granater med dopplerradar för granatgeväret Carl Gustaf / Exit Velocity Measurement of Grenades with Doppler Radar for Grenade Launcher Carl Gustaf

Evaluation of FMCW Radar Jamming Sensitivity