基于改进POCET技术的通导一体化信号设计

Integrated Signal Design of Communication and Navigation Based on Improved POCET Technology

关键词:  POCET  低轨卫星  通导一体化  恒包络复用

Key words:  POCET  LEO satellite  Communication and navigation integration  Constant envelope multiplexing

摘要:

随着低轨卫星组网的发展，结合我国北斗三号全球卫星导航系统的全面建成，研究兼容北斗的通信导航一体化技术日益迫切。为使卫星上的高功率放大器工作在非线性饱和区，以达到较高的发射功率效率，需要保证合成信号的恒包络特性。考虑北斗导航信号与低轨卫星通信信号频点不同，且待复用信号分量较多，以相位优化恒包络发射（POCET）技术为基础，提出了一种改进的多频点多非独立信号分量恒包络复用技术，对七路信号进行复用，利用罚函数进行目标函数优化得到最优解。通过分析其信号特性，表明该方法具有较高的复用效率，并能有效抑制非独立分量造成的波形畸变，从而实现通信导航一体化信号设计，为未来基于低轨卫星的通信导航一体化波形设计提供了思路。

Abstract:

With the development of LEO satellite networking and the successful completion of China's Beidou-3 global satellite navigation system, it is increasingly urgent to study the integrated communication and navigation technology compatible with Beidou. In order to make the high-power amplifier on the satellite work in the nonlinear saturation region and achieve high transmission efficiency, it is necessary to ensure the constant envelope characteristics of the synthetic signal. Considering that Beidou navigation signal and LEO satellite communication signal have different frequency points, and several signal components are to be multiplexed, based on phase-optimized constant-envelope transmission (POCET) technology, an improved multi-frequency point and multi-signal component constant envelope multiplex technology is proposed to realize the integrated signal design of communication and navigation. By multiplexing seven signals, the objective function is optimized via penalty function to obtain the optimal solution. By analyzing its signal characteristics, it shows the method has high multiplex efficiency and can effectively suppress the waveform distortion caused by the non-independent components. It can provide an idea for the integrated waveform design of communication and navigation based on LEO satellites in the future.