1 / 10

Training Slides

Training Slides. Code 5774 Naval Research Laboratory Washington DC, 20375 202-404-7616 (DSN) 754-7616 builder@enews.nrl.navy.mil builder@nrl-dc.navy.smil.mil https://builder.nrl.navy.mil https://builder.nrl-dc.navy.smil.mil. Day 1 Exercise.

Download Presentation

Training Slides

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Training Slides Code 5774 Naval Research Laboratory Washington DC, 20375 202-404-7616 (DSN) 754-7616 builder@enews.nrl.navy.mil builder@nrl-dc.navy.smil.mil https://builder.nrl.navy.mil https://builder.nrl-dc.navy.smil.mil

  2. Day 1 Exercise • There is a civilian cell phone network in Baghdad. • There is a group of friendly vehicles traveling through the area. • They have an independent comm system • They’ll jam the civilian network as they pass through • To save time, we’ll use the cell towers and hummers modeling in Chapter 11 • Open the CellTower lab in the tutorials directory • Save to an alternate scn on your desktop • Remove the UAV • Remove the network

  3. Civilian cell towers • Reposition the two existing towers, and add a third tower by exporting/importing the tower. Use the following positions. • Tower A • Latitude: 33.3039 • Longitude: 44.4942 • Tower B • Latitude: 33.3291 • Longitude: 44.1188 • Model the signal coverage of the civilian network • Use SNR plots. Ignore jamming; we’ll add it later. • Assume Minimum SNR is 7 • Assume Ideal SNR is 15 • Increase the towers’ Tx power to 30 W

  4. Civilian Network Coverage • Model the signal coverage of the civilian network • Use SNR plots. Ignore jamming; we’ll add it later. • Assume Minimum SNR is 7 • Assume Ideal SNR is 15 • Increase the towers’ Tx power to 30 W

  5. Friendly Transit Path • Use this path to reposition and define Hummer 1’s motion • Initial Point: • Latitude: 33.3835 • Longitude: 44.4641 • First Waypoint: • Latitude: 33.3186 • Longitude: 44.4068 • Second Waypoint • Latitude: 33.2319 • Longitude: 44.4116 • You can leave the velocity at ~49 knots, it’s ~55mph

  6. Reducing Unnecessary Calculations • Models of jammed comm networks take a lot of time (longer than jammer radar plots) • To reduce unnecessary computations, we want to limit area that we calculate signals for. • Add an overlay to the Hummer that shows range rings up to 3000 ft. • Use whatever division distance seems good. • Then crop the plots of civilian tower coverage so they only cover the transit region…

  7. Reducing Unnecessary Calculations • Results of my cropping… • Tower A: • Range: 7 km – 12 km (4.35 mi - 7.45 mi) • Azimuth: 220 – 350 • Tower B: • Range: 25 km – 35 km (15.5 mi – 21.75 mi) • Azimuth: 77 – 115 • Reducing divisions to 10 for range and 20 for azimuth should maintain reasonable calculation times; we’ll bump up the resolution later

  8. Friendly Jamming • Add a jammer to the Hummer • Antenna: Isotropic • Gain: 1 dBi • Tx: 1800 MHz (same as towers) • Bandwidth: 5 MHz(should be at least equal to tower bandwidth) • Power: .5 W • System Loss: 2 dB • Height: 5 ft • What are the ranges of signal values from each tower along the Hummer’s path? • -100 dBW to -110 dBW from Tower A • -130 to -135 from Tower B • What is the signal strength of the jammer at 100, 300, 500, 1000, and 200 ft from the vehicle? • Plot the Jammer’s signal, use the plot tool in conjunction with range rings to see the signal values of -70, -85, -90, -95, respectively. • At what distance does the signal drop below -100 dBW? • ~1100 ft • Change the two towers’ plots to include the effects of the Hummer’s jammer (as noise)

  9. Modeling Potential Receivers • So far, we’ve ignored the receiver’s capabilities. To get a better idea of jamming effectiveness, we need to consider what type of receiver we’re trying to jam. • Create a hostile land vehicle, location is unimportant • Add a comm device to represent a cell phone’s receiver • Use an Isotropic pattern • Gain: 0 dBi • Z Offset: 10ft • Rx: 1800 MHz • Rx Bandwidth: 1 MHz • Rx Noise: 5 dB • Min SNR: 7 dB • Ideal SNR: 10 dB • System Loss: 2 dB

  10. Modeling Potential Receivers • Use the receiver you just created in Tower A’s signal plot • Opt not to treat jammers as noise • Move the Hummer to the spot you think will be most vulnerable (using the time-slider) • Crop the plot down to approximately match the extent of the range overlay you created before. • Experiment with how effective the jammer is against a range of receiver values • Use J/S (in the cell phone function) to define a jamming buffer • This controls the magenta section of the plot

More Related