半无数据调制信号体制设计

分布式系统的节点时间自同步通常采用双向单程伪距测量（dual one-way ranging，DOWR）的方法来实现。针对DOWR中存在双向多路径时延差异，基于双支路半无数据调制技术，提出采用BOC（binary offset carrier）调制克服多路径误差。半无数据调制是指同相支路不调制数据，主要完成信号的捕获及跟踪，数据的解调在调制数据的正交支路上完成。为提高同相支路信号的捕获跟踪精度，增强正交支路数据的传输可靠性和抗干扰能力，分别对PSK-R（1）、PSK-R（10）、BOC（1，1）和BOC（10，5）等信号调制样式进行了对比分析。仿真结果表明，采用BOC（10，5）调制有效地提高了信号的码跟踪精度，增强了信号的抗多径和抗干扰能力。

Design of half-data modulation signal system

Node time self-synchronization of distributed system usually adopts DOWR method to achieve. Aiming at the difference of bidirectional multipath delay in DOWR, based on double branch half-data modulation technology, this paper proposed BOC modulation to overcome multipath error. Half-data modulation means that the in-phase branch does not modulate the data, mainly completes the acquisition and tracking of the signal, and the quadrature branch of modulated data finishes the demodulation of data. In order to improve the acquisition and tracking accuracy of in-phase branch signal and enhance the transmission reliability and anti-jamming ability of quadrature branch data, this paper compared and analyzed the modulation modes of PSK-R(1), PSK-R(10), BOC(1, 1) and BOC(10, 5). The simulation results show that BOC(10, 5) modulation can effectively improve the code tracking accuracy of the signal and enhance the anti-multipath and anti-jamming ability of the signal.