稀疏节点直接序列扩频信号空间能量合成研究

Research on spatial energy synthesis of sparse node direct-sequence spread spectrum signals

通过稀疏节点直接序列扩频信号的空间能量合成,辨析了调制信号在二维空间的相干能量分布,结合扩频系统的调制解调过程提出了空间能量相关性指标,并以此对合成信号在聚焦区域形成的干涉效应和叠加效果进行分析。充分考虑理论模型在实际应用中的可行性,通过理论推导和仿真分析研究了稀疏节点同步误差因素对直接序列扩频信号合成效果的影响。分析结果表明:通过发射端的伪码序列时延预补偿,可实现相干能量在预设聚焦点功率值的平方倍增强;稀疏节点时钟同步精度应控制在1/4载波周期范围内,否则将同时导致聚焦点位移和能量相关性损失。给出的方法与结论可为稀疏节点扩频调制信号空间能量合成技术在实际分布式导航对抗等功能系统中的应用提供理论依据。

Through the spatial energy synthesis of sparse node direct-sequence spread spectrum signals,the coherent energy distribution of modulated signals in two-dimensional space was analyzed.By combining the modulation and demodulation process of the spread spectrum system,a spatial energy correlation index was proposed and was then used to analyze the interference and superposition effects formed by the synthesized signals in the focused area.Considering the feasibility of theoretical models in practical applications,this paper studied the impact of synchronization error factors of sparse nodes on the synthesis effect of direct-sequence spread spectrum signals through theoretical derivation and simulation analysis.The analysis results indicate that by implementing pseudocode sequence delay pre-compensation at the transmitting end,it is possible to achieve a squared enhancement of coherent energy at the power value of the preset focus point.The synchronization accuracy of sparse node clocks should be controlled within 1/4 of the carrier cycle range;otherwise,it will simultaneously lead to displacement of the focus point and loss of energy correlation.The proposed methods and conclusions can provide a theoretical basis for the application of sparse node spread spectrum modulation signal space energy synthesis technology in practical distributed navigation countermeasure systems and other functional systems.