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In Figure 25-1 , the concept of the LEO arrangement is shown In this particular case, the satellites are traversing the earth s surface at a height of 400+ nautical miles above the earth, in a polar orbit In the polar orbit, the satellite moves around the earth s poles and pass over any specific point along its path very quickly The satellites move at approximately 7,400 meters per second in different orbits Therefore, as one target site

body frame the square steel tubing and the wire mesh used for the armor came from Home Depot, another great inexpensive supplier Chew Toy is something that all designers like a cheap entry The cost for this robot (everything but the speed controller) was about $500 (Instead of doing what I had initially conceived create a simple relay system I splurged on a Vantec speed controller for Chew Toy It cost about as much as the entire rest of the robot, but, because the speed controller is an item that can be reused in future designs, I looked at my extravagance as an investment In addition, it saved the time that it would have taken to construct and properly test the relay system I had devised in the early phase of Chew Toy s development) Once you figure out what you want to build, the next step is building the mockup I cut out a balsa wood frame and the parts into which the motor, the drive train, weapons system, and so on, will be fit Balsa is easy to work with, and any hobbyist who has done original designs of model airplanes, boats, or the like has probably done mockups in balsa wood Balsa wood is also cheap and readily available, and if you botch something in the mockup phase, you can redo it much more easily than if you were working in metal After your balsa wood mockup is within your parameters and everything looks workable, you are ready to spec out your final project The balsa wood project can be broken down into the component parts and used as guides for cutting the metal for the final project If you are doing your own metal cutting, you can take apart your mockup and use each piece as a template for your metal pieces I laid the pieces on top of the metal, traced the shape onto the metal, and then cut out the shapes That way I was sure all the metal shapes would be the exact size I specified, and when I cut and fit the bot together it would replicate the mockup.

moves out of view, a new one comes into view at approximately the same time A handoff will take place between the individual satellites (using the Ka band)

Figure 3-6

Metal shops can also use your balsa template as a guide If a shop is also going to be doing all your welding, it is a good idea to give these folks your design sketch and review it with them so they understand exactly what you want your finished piece to look like Showing them the balsa mockup before you disassemble it for template parts is also useful, especially if you are working with people who have no prior experience with robotics

Figure 25-1: The LEO concept In Figure 25-2 , the ground telemetry and control services are represented, called gateway feeder links These also use spectrum in the Ka band Iridium used approximately 165 MHz of bandwidth in the L band The L band is also used from the handset to the satellite, whereas the Ka band is used from satellite to satellite communications, as shown in Figure 25-3 The use of this L band allows low-powered handsets to communicate within the 413 nautical mile distances with the satellites

The New Project dialog box shows the beginning of the creation of a project that will eventually hold cubes, dimensions, mining models, and other objects

.