Software-defined radio (SDR) is a communication system that uses software to replace traditional hardware components, such as mixers, amplifiers, filters, and modulators, which are commonly used in traditional radio systems. In SDR, the signal processing is carried out in software, which offers greater flexibility and adaptability compared to traditional radio systems. The radio’s hardware consists mainly of a universal radio front end that can receive signals across a wide frequency range and convert them to digital signals for processing by the software.
SDR can be used in various applications, including telecommunications, military, satellite, and amateur radio. Here are a few examples of SDR systems:
- Universal Software Radio Peripheral (USRP): USRP is a popular SDR platform that is widely used for research and education. It consists of a hardware front end and an open-source software platform that allows users to develop custom radio applications. USRP can operate in frequencies ranging from DC to 6 GHz and supports a variety of wireless communication standards, including 5G, Wi-Fi, and Bluetooth.
- HackRF One: HackRF One is another popular SDR platform that can receive and transmit signals in a wide frequency range from 1 MHz to 6 GHz. It can be used for various applications, such as sniffing wireless traffic, jamming signals, and even for radio astronomy.
- RTL-SDR: RTL-SDR is a low-cost SDR platform that is based on the Realtek RTL2832U chipset. It is primarily used for receiving and decoding digital signals, such as FM radio, ADS-B, and NOAA weather satellite signals. RTL-SDR is a popular choice for hobbyists and enthusiasts due to its low cost and easy-to-use software.
- FlexRadio Systems: FlexRadio Systems is a leading manufacturer of SDR radios that are primarily used for amateur radio. Their SDR radios provide high performance and flexibility, allowing users to operate multiple radios from a single platform. The software allows users to customize the radio’s performance and features to meet their specific needs.
In summary, SDR is a flexible and adaptable radio system that uses software to replace traditional hardware components. SDR platforms, such as USRP, HackRF One, RTL-SDR, and FlexRadio Systems, can be used for various applications, including telecommunications, military, satellite, and amateur radio.
Examples of Public SDR.