what is that of satellites and radar systems design???

Question

I heard about that electrical engineers designs radars and satellites systems.They use CAD or what to design this????

Answer 1

The previous answer is correct that it is a team effort of many engineering disciplines to successfully design a satellite system or radar. Formulating a design is rather separate from CAD. It involves concepts and ideas generated from experience and from a sound educational foundation in engineering topics. The CAD is used to fine tune the design, verify concepts and approaches, and provide an implementation of the design.

In terms of engineering use of CAD, in my experience all of the electronics engineers make use of CAD in design of electronic circuits. I use CAD directly to help in the design of analog electronics as well as in the simulation of digital signal processing algorithms. CAD is also used to draw schematics and layout printed circuit boards (PCBs). I am not as involved in the use of CAD for layout of PCBs, although some engineers choose to stay involved in the use of this tool in order to retain full control of their design (a poor layout can ruin an otherwise good design). Mechanical engineers that I work with make use of SolidWorks, a 3D CAD tool.

The CAD tools used for schematic capture are usually part of a suite and therefore have multiple uses. Not only is the same software program used to document the schematic (graphical interconnection of electrical components), but it is used to automatically generate bills of material (BOM), netlists (interconnectivity file used by PCB CAD tools), and to simulate the mixed analog and digital behaviour of the circuits being designed. These tools can also perform signal integrity checks, compile VHDL for FPGAs, and manage the files for a project.

For digital signal processing, I use Matlab with Simulink. This is a math engine with a graphical interface (Simulink) that allows block diagrams to be drawn to simulate various math functions which can be connected together to form algorithms. The tool provides graphing capabilities so that the operation of the algorithm can be analyzed and examined.

These are all real-life examples of engineering CAD - Computer Aided Design. The computer is a tool, the software packages are tools, much like calculators and pen and paper are tools. The engineer must know why things work and provide a structure compatible with theory and the requirements of each project in order to achieve a working design using these tools.

Answer 2

Engineers rarely use CAD unless they are specifically trained for it. Electrical engineers do exactly what the name implies... they engineer the electronics and related systems. Engineers are problem solvers not CAD people unless they want to be. And CAD is rarely ever used in circuit design and analysis. Lots of math and tons of physics goes into designing circuitry and other such systems.