The Military Application of the Software Defined Radio

The Military Application of the Software Defined Radio

The term of software defined radio is raised by American military to solve the communication problems of troops from different countries. The traditional communication devices used by different armies are not compatible with each other, therefore, troops can not contact timely with each other. The so called alliance was not the really one, troops were just simply getting together. In order to solve the above problems, the plan of speak easy is implemented by The US defence advanced research project agency in the year of 1995.

The software defined radio is popular in the military communication field, because it is easy to be handled, the construction is simple. The military radio station is designed according to the specific usage; therefore, the function of the radio station is single. The construction is the same with the ordinary one, while the signal characteristic has large differences. When it comes to the working principle, the RF signal is changed to be the IF signal through the receiver, and then the simulated signal is changed to be the A/D sampling. The data and video can be achieved after the processing the signals. The data and video can not be directly send to people, which should be examined firstly to make sure the safety of them.

The flexibility and openness are the main characteristics of the software defined radio. The new functions can be easily added through adding the software modules. The software defined radio can contact with any station and be the radio frequency trunk for them. Costs can be cut by cancelling the useless software module. The standardized and modularized construction is applied in the software defined radio, therefore the hardware can be expanded, and the software can be updated in accordance of the newest technology. It is able to compatible with the stations of old system, thus the service of the old system station is also lengthened.

Apart from the military field, the software defined radio can also be applied in the other field, such as the radar and other applications. However, it also faces many technical challenges, such as the antenna technology and miniaturization technology. These technologies are developing rapidly nowadays, which will decide the entire development of software defined radio. The related integrated circuit is LT1355CN8.

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