中文：

SDR，全称为软件定义无线电（Software-Defined Radio），是一种无线电广播通信技术。它基于软件定义的无线电波传播，将更多的信息编码到单一的无线电波中，从而实现更高的数据传输速率和更广泛的通信应用。

SDR技术的主要特点在于其灵活性和可扩展性。通过软件编程，SDR可以支持多种不同的无线电通信协议和标准，包括但不限于WiFi、蓝牙、4G/5G等。此外，SDR还可以实现多种功能，例如频率变换、信号处理和数据加密等。

SDR技术的应用范围非常广泛。在军事领域，SDR可以实现无线电隐蔽通信和抗干扰通信；在民用领域，SDR可以用于无线宽带接入、移动通信、智能交通等领域。此外，SDR还可以用于物联网、智能家居等新兴领域，为实现更加智能化的未来提供技术支持。

总的来说，SDR是一种灵活、可扩展的无线电通信技术，具有广泛的应用前景和发展潜力。未来，随着通信技术的不断发展和进步，SDR技术将在更多的领域得到应用和发展。

英文：

SDR, short for Software-Defined Radio, is a radio broadcasting and communication technology. It relies on software-defined radio wave transmission to encode more information into a single radio wave,从而实现higher data transmission rates and broader communication applications.

The main feature of SDR technology lies in its flexibility and scalability. Through software programming, SDR can support multiple different radio communication protocols and standards, including but not limited to WiFi, Bluetooth, 4G/5G, etc. In addition, SDR can also achieve multiple functions such as frequency conversion, signal processing, and data encryption.

The application scope of SDR technology is very wide. In the military field, SDR can achieve radio stealth communication and anti-interference communication. In the civilian field, SDR can be used for wireless broadband access, mobile communication, intelligent transportation, etc. In addition, SDR can also be used in emerging fields such as the Internet of Things and smart homes, providing technical support for the realization of more intelligent future.

Overall, SDR is a flexible and scalable radio communication technology with broad application prospects and development potential. In the future, with the continuous development and advancement of communication technology, SDR technology will be applied and developed in more fields.