【中文版】

SDR是软件定义无线电（Software-Defined Radio）的缩写，它是一种无线电通信技术，可以通过软件编程来改变无线电信号的波形、频率和调制方式等参数，实现多种不同的通信功能。

SDR技术的核心思想是将无线电信号的处理过程从传统的硬件电路中分离出来，通过软件来实现对信号的捕捉、变换、分析和调制等操作。这种技术可以大大提高无线电设备的灵活性和可扩展性，使其能够适应不同的通信需求和环境变化。

SDR技术的应用范围非常广泛，包括军事、民用和科研等领域。在军事领域，SDR技术可以实现无线电设备的快速升级和改造，提高设备的通信能力和抗干扰能力；在民用领域，SDR技术可以用于移动通信、无线宽带、卫星通信等领域，提高通信质量和覆盖范围；在科研领域，SDR技术可以用于各种无线电实验和研究，方便地实现不同的实验方案。

随着计算机技术和通信技术的不断发展，SDR技术也在不断进步和完善。未来，随着5G、物联网等新兴技术的发展，SDR技术的应用前景将更加广阔。

【英文版】

SDR is the abbreviation of Software-Defined Radio, which is a wireless communication technology that can change parameters such as waveform, frequency, and modulation mode of radio signals through software programming to achieve multiple communication functions.

The core idea of SDR technology is to separate the processing of radio signals from traditional hardware circuits and implement operations such as signal capture, transformation, analysis, and modulation through software. This technology can greatly improve the flexibility and scalability of radio equipment, making it adapt to different communication needs and environmental changes.

The application range of SDR technology is very wide, including military, civilian, and scientific research fields. In the military field, SDR technology can achieve rapid upgrading and transformation of radio equipment to improve communication capabilities and anti-interference capabilities; in the civilian field, SDR technology can be used in mobile communication, wireless broadband, satellite communication and other fields to improve communication quality and coverage; in the scientific research field, SDR technology can be used for various radio experiments and research to easily implement different experimental schemes.

With the continuous development of computer technology and communication technology, SDR technology is also constantly improving and perfecting. In the future, with the development of emerging technologies such as 5G and the Internet of Things, the application prospects of SDR technology will be more extensive.