EAGER: Bio-inspired Low Probability of Detection Secure RF Waveform Design

本项目的目的是研究开发一种新的安全通信波形设计技术，在这种技术中，不仅通信数据是安全的，而且通信本身的存在是隐藏的。通过利用生物启发的方法，将设计一种新的射频波形，用于多种目的，并同时包含多层消息。所开发的无线电频率波形不具有可被对手利用来通过时域分析、频域分析或循环平稳分析检测其存在的特征。该项目利用了雷达和通信界的最新进展，并将它们结合在一起，协同开发出前所未有的低检测概率、安全的无线电频率波形设计。现有的低概率检测波形不提供一个真正的低概率检测和安全能力时，新的先进的检测方案，如循环平稳分析承担。该项目采用了一种新的生物启发的RF隐写方案来掩盖雷达信号中的通信信号。这种新设计的信号仍然是一种有效的雷达信号，为操作员提供正常的雷达功能，例如距离测量;但它也为指定的接收器提供安全的数字通信。新设计的波形以最大功率广播，而不是限制信号的传输功率以避免被对手检测到。然而，对手没有检测到嵌入在混合信号中的数字调制的存在，因为当进行时域分析、频域分析或循环平稳分析时，混合信号没有表现出任何特征。该项目具有变革性，因为它提供了一种全新的方式来设计低检测概率和安全的通信和射频系统，它还为未来开发通用认知射频平台铺平了道路，在该平台中，所有射频系统（如通信，雷达和导航）都是联合设计的，以优化其性能和频谱效率。

The goal of this project is to conduct research and development of a novel secure communication waveform design technique in which not only the data of the communication is secure but the very existence of the communication itself is hidden. By exploiting a bio-inspired approach, a novel radio frequency waveform will be designed to serve multiple purposes and contain multiple layers of messages simultaneously. The developed radio frequency waveform exhibits no feature that can be exploited by the adversary to detect its existence through time domain analysis, frequency domain analysis, or cyclostationary analysis.This project takes advantage of recent progress in the radar and communication communities and brings them together synergistically to develop an unprecedented low probability of detection, secure radio frequency waveform design. Existing low probability of detection waveforms do not provide a true low probability of detection and security capability when new advanced detection schemes such as cyclostationary analysis are brought to bear. This project employs a novel bio-inspired RF steganography scheme to obscure the communication signal within a radar signal. This newly designed signal remains an effective radar signal providing normal radar capabilities such as range measurement to its operators; but it also carries secure digital communication intended for designated receivers. Instead of limiting the transmission power of the signal in hopes of avoiding detection by the adversary, the newly designed waveform is broadcast at maximum power. However the adversary does not detect the existence of digital modulation embedded in the hybrid signal because it does not exhibit any feature when subjected to time domain analysis, frequency domain analysis, or cyclostationary analysis. This project is transformative because it provides a brand new way to design low probability of detection and secure communication and radio frequency systems, and it also paves the way to future development of a universal cognitive radio frequency platform where all radio frequency systems such as communication, radar, and navigation are designed jointly to optimize their performance and spectrum efficiency.