一种基于混频原理的稳相传输系统设计

Design of a Steady Phase Transmission System Based on Mixing Principle

目前分布式相参雷达系统内的信号传输,正朝着低相噪、高稳定度方向发展。为顺应该发展趋势,针对当前分布式相参雷达系统内稳相传输方法中结构复杂、稳相后远端输出的射频信号相位噪声较大等问题,设计了一种新的稳相方案。该方案依靠混频消除原理,将一个探测信号在光纤里往返传输一次,用于感知光纤链路的时延抖动,回到本地端后与另一频率的信号下混频,实现符号变换,预补偿射频信号相位抖动,最终实现稳相传输。该系统结构相对简单,稳相效果好,能有效提升射频信号传输的质量,并理论分析和实验验证了该设计的可行性。

At present,the signal transmission in distributed coherent radar system is developing towards low phase noise and high stability.In order to comply with this development trend,a new phase stabilization scheme is designed aiming at the problems of the current phase stabilization transmission methods in distributed coherent radar systems,such as complex structure and large phase noise of the radio frequency signal output at the remote end after phase stabilization.The scheme relies on the principle of mixing elimination to transmit a detection signal once round trip through the optical fiber for sensing the delay jitter of the optical fiber link.After returning to the local end,the detection signal is mixed with another frequency signal to achieve symbol conversion,pre-compensate RF signal phase jitter,and finally achieve stable phase transmission.The system structure is relatively simple,the phase stabilization effect is good,and it can effectively improve the quality of RF signal transmission,and theoretical analysis and experiment verify the feasibility of the design.