Ubiquitous signal coverage is a basic demand of Internet of Things (IoT) communications, which meets the feature of satellite communications. Infinite user number is a basic demand of IoT location-based services, which meets the feature of Global Navigation Satellite System (GNSS). Both of these demands make Satellite Navigation and Communication Integration (SNCI) an important supporting technology for IoT. Inherited from the satellite communications system, GNSS itself has a certain data transmission capacity. Thus, enhancing the communication function of the GNSS is a promising means of achieving SNCI. Considering that a unified signal system cannot currently realize high-precision positioning and high-speed data transmission simultaneously in SNCI, this project proposes a Correlation Domain Indefinite Pulse Position Modulation (CDIPPM). A pilot channel and a data channel are introduced in this technology, which are distinguished by Code Division Multiplexing (CDMA). The synchronization function is provided by the pilot channel, thereby freeing the data channel of this function. The phase of the pseudorandom code can then be used as the carrier of information. In order to transmit more information, the transmitter of the proposed technology superimposes on the data channel multiple sets of spread spectrum sequence, which are generated from one set of spread spectrum sequence by different cyclic shifting operations. The receiver will identify the number and location of the correlation function peaks by a detection algorithm and recover the message. It can be seen by theoretical analysis and simulation verification. The technology can significantly improve satellite data transmission rates and maintain the original positioning function while minimizing change in the original GNSS signal. Therefore, the SNCI system based on this technology has the following advantages: a unified signal system, high positioning accuracy, high data transmission rate, and a backward navigation function, and it is easy to promote.

中文翻译：

---

基于相关域不定脉冲位置调制信号的卫星导航通信一体化

无处不在的信号覆盖是物联网（IoT）通信的基本需求，符合卫星通信的特点。无限用户数是物联网定位服务的基本需求，符合全球导航卫星系统（GNSS）的特点。这两种需求使卫星导航与通信集成（SNCI）成为物联网的重要支撑技术。GNSS继承了卫星通信系统，本身具有一定的数据传输能力。因此，增强 GNSS 的通信功能是实现 SNCI 的一种有前景的手段。考虑到SNCI目前统一信号系统无法同时实现高精度定位和高速数据传输，本项目提出相关域不定脉冲位置调制（CDIPPM）。该技术引入了导频信道和数据信道，以码分复用(CDMA)来区分。同步功能由导频通道提供，从而释放该功能的数据通道。伪随机码的相位然后可以用作信息的载体。为了传输更多的信息，所提出的技术的发射机在数据信道上叠加了多组扩频序列，这些扩频序列是由一组扩频序列通过不同的循环移位操作产生的。接收器将通过检测算法识别相关函数峰值的数量和位置并恢复消息。通过理论分析和仿真验证可以看出。该技术可以显着提高卫星数据传输速率并保持原有定位功能，同时最大限度地减少原始GNSS信号的变化。因此，基于该技术的SNCI系统具有信号系统统一、定位精度高、数据传输速率高、具有后向导航功能、易于推广等优点。