![]() ![]() ![]() ![]() However, such GNSS signal simulators can be expensive and beyond the limited budgets of many researchers. Some simulators allow us to record live signals and then to play them back under different assumed conditions. These devices allow us to define scenarios, including receiver trajectories, and to replay them while varying the operating parameters of the receiver. With a radio frequency simulator, we can mimic the radio signals generated by the satellites. And simulation is a mainstay of the movie industry.īut getting back to engineering and the main interest of this magazine, simulation is a useful technique in the design and operation of equipment used with global navigation satellite systems. We also use simulation for recreation, whether it is playing with the latest computer game or improving our swing with a golf simulator. Simulation is used for a range of engineering activities to see how an existing system behaves under different conditions because it is faster or cheaper than performing tests in the “real world.” It can also be used to estimate how a proposed new system might behave before it becomes a reality - looking at traffic flow in road networks, for example. Similarly, flight simulators are used for the training of pilots because it is cheaper and safer than using real aircraft and a wide variety of “what if” scenarios can be experienced. In medical education, simulated human patients are used initially because it is safer than having students operate on real patients. Simulations of reality are often used in teaching where students can more easily grasp the behavior of complicated systems whether they be in the natural sciences or in economics or the social sciences. Typically, the models are run on a computer where the model parameters and initial conditions can be readily adjusted and the varying outcomes analyzed. The model may contain a stochastic component to reflect a degree of uncertainty associated with the processes. We build mathematical models of physical, chemical, or biological processes to better understand them or to predict a particular outcome given some initial conditions. In mathematics and science, we try to comprehend reality, which is complicated and variable and often has some degree of randomness. ![]() WHY DO WE SIMULATE REALITY in mathematics, science, engineering, and other pursuits - even in our recreational activities? Well, we do it for a variety of reasons. ![]()
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