CAJ | 학술논문

新型 CBOC 导航信号的自相关函数存在多个过零点和侧峰，因此其捕获更具挑战性。针对 CBOC 信号提出了一种基于 FFT 的快速无模糊度捕获方法，该方法利用两路正交的本地亚载波消除了 CBOC 信号自相关函数的多峰特性，并采用了基于 FFT 的并行捕获结构来加速导航信号的捕获。此外，针对 CBOC 信号是一种时域组合 BOC 信号的特性，给出了所提方法的 BOC（1，1）型、非相干 CBOC 型和相干 CBOC 型接收机的模型，并分析对比了其性能。仿真结果表明所提的并行 SCPC 方法能快速正确地捕获 CBOC 信号，且其相干 CBOC 型接收机比另外两种接收机具备更优的性能。此外，相比 BPSK-like 方法，所提方法最大能有1dB-Hz 的性能提升。
신형 CBOC 도항신호적자상관함수존재다개과영점화측봉，인차기포획경구도전성。침대 CBOC 신호제출료일충기우 FFT 적쾌속무모호도포획방법，해방법이용량로정교적본지아재파소제료 CBOC 신호자상관함수적다봉특성，병채용료기우 FFT 적병행포획결구래가속도항신호적포획。차외，침대 CBOC 신호시일충시역조합 BOC 신호적특성，급출료소제방법적 BOC（1，1）형、비상간 CBOC 형화상간 CBOC 형접수궤적모형，병분석대비료기성능。방진결과표명소제적병행 SCPC 방법능쾌속정학지포획 CBOC 신호，차기상간 CBOC 형접수궤비령외량충접수궤구비경우적성능。차외，상비 BPSK-like 방법，소제방법최대능유1dB-Hz 적성능제승。
A new open service signal adopting CBOC modulation is introduced in GNSS.Due to the multi-peak in the auto-correlation function envelope of CBOC signal,the acquisition is made more complex.In this paper,a fast unambiguous acqui-sition method based on FFT is presented to acquire CBOC signal.The proposed method utilizes two orthotropic local sub carri-ers to eliminate the ambiguity introduced by the multimodality of the ACF envelop,and also adopts an FFT-based acquisition structure to significantly reduce the time expenditure on acquisition procedure.Moreover,three receiver modes,i.e.,BOC (1,1)reference receiver,Non-coherent CBOC reference receiver and Coherent CBOC reference receiver,for the proposed method are presented and analyzed.Performance of the three receiver modes are also analyzed and compared.Results of Monte Carlo simulations show that the proposed method can acquire the CBOC signal quickly and correctly,and is superior to the BPSK-like method.Besides,Coherent CBOC reference receiver owns the best performance in the three receiver modes.