MICROWAVE RADIO COVERAGE FOR VEHICLE TO-VEHICLE AND IN-VEHICLE COMMUNICATION

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MICROWAVE RADIO COVERAGE FOR VEHICLE TO-VEHICLE AND IN-VEHICLE COMMUNICATION

  1. 1. Prepared by: Krunal Siddhapathak(10bec097) *
  2. 2. *Introduction *SIMULATING IN-CAR MICROWAVE PROPAGATION *BLUETOOTH LINK SIMULATION RESULTS *BLUETOOTH IN-CAR EXPERIMENTAL RESULTS *VEHICLE TO VEHICLE COMMUNICATION *CONCLUSION
  3. 3. * *Vehicle to vehicle communication and in vehicle communication is important for intelligent transport system. *Bluetooth radio frequency channel is used for in vehicle communication. *Bluetooth link is used for vehicle to vehicle to communication. *Bluetooth working on 2.45 GHz and LAN working at 64GHz are used at high frequency.
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  5. 5. *To determine electromagnetic scattering from complex ,lossy die electric structure some simulation tools like WIPL-D ,FEKO and SEMCAD are used. *WIPL-D is based on the Method of Moments (MoM). *It defines: 1)geometry of a structure as any combination of wires 2)structure’s current distribution 3)far-field radiation pattern 4)Near field distribution 5) multiport admittance at predefined feed points.
  6. 6. * FEKO is also based on the Method of Moments. FEKO The MoM, which scales poorly with frequency, has been hybridized with two asymptotic high frequency techniques namely: 1) physical optics (PO) 2) uniform theory of diffraction (UTD)  This hybridization enables the solution of much larger problems (in terms of wavelengths). SEMCAD uses a Finite-Difference Time-Domain (FDTD) kernel and focuses on main applications, namely near- field analysis, antennas embedded in complex environments, EMC/EMI applications and dosimetry.
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  9. 9. * *At 2.45 GHz, the simulation is performed using a quarter wave antenna radiating inside the car structure. *This transmitting antenna is located either on the dashboard or in the rear boot. *A metal sheet is also laid between the passenger cell and the motor compartment. *A 10 cm diameter circular hole is perforated into this metal sheet. Otherwise, the passenger cell is empty. *Windscreens are considered fully transparent to RF signals and the car body is simulated as a perfect conductor. * Figures 2 and 3 show results respectively obtained using the 2.45 GHz radiating source (bright point) situated on the dashboard or in the boot. * They are presented with an overall dynamic range representation of respectively 60 dB and 40 dB.
  10. 10. * *From the dashboard, a fairly good RF coverage is obtained over the whole structure including the imperfectly shielded motor compartment. * An overall signal amplitude dynamic of 50 dB is deduced from these results. *Moving the receiving location a few centimetres apart, even in the vicinity of the transmitting antenna, leads to signal fluctuations in the order of 30 dB. *This result can be compared to the huge number of propagation modes that exist inside a large perfectly conducting cavity. *On figure 3, transmitting from the boot yields to different results. The motor compartment radio coverage exhibits a supplementary attenuation due to the presence of the metal sheet separating the passenger cell from the motor compartment. *The lower overall dynamic of the representation emphasizes the fluctuations of signal propagated inside the car body.
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  15. 15. * *Within a platoon, car and truck drivers use information about the speed and position of the preceding and following vehicles in order to elaborate and update a real time driving solution. *these equipments only track the first preceding vehicle to deduce its speed and position. *Nevertheless, this computed information remains on board the vehicle that has performed the measurement. *a platoon, the frontal road perception of the first vehicle is very particular and highly significant. Thus, it seems to us, that this information can be shared in real-time with the following vehicles within the platoon. *This concept has been named Electronic Millimetre Wave P re-View Mirror (EPVM). Two RF links are considered. *The first one uses a Bluetooth 2.45 GHz link, the second one uses a modified extended AICC sensor. *This last concept is illustrated by the artist’s view provided in figure 4. Using a passive sub-reflector, some of the millimetric (76 GHz) RF power available in the sensor is transmitted backwards behind the vehicle to following vehicles.
  16. 16. * *The use of Bluetooth has been investigated in order to evaluate its potential for some ITS applications. *Simulating and experimenting these systems for communicating inside a vehicle show that the propagation channel is harsh but that it is possible to maintain, for the chosen experimented locations a good radio-coverage inside the whole car. *For vehicle-to-vehicle communication, Bluetooth 1.1 standard available equipment seems also promising. Using available PCMCIAs cards, video transmissions up to 100 m have been achieved. *Of course, the limited standard data rate means limited video resolution and frame rate in comparison to the use of the wide bandwidth provided by an AICC extended sensor.

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