CAJ | 학술논문

给出一种高动态 GPS弱信号捕获算法。对接收到的卫星信号，以1 ms 为步进做20次数据翻转位估计，确定出单次积分时间为20 ms；以单次积分时间内相干损耗小于1 dB为标准，确定单次积分中频率和码相位的搜索步进；在第二级累加之前对多普勒频偏和导航数据进行同时补偿，实现多级相干累加捕获。模拟一组卫星信号，利用软件接收机的设计进行仿真验证，结果显示，该方法在信号功率为-180 dBW的情况下，捕获所需的累加次数是相干-非相干方法的36.4%，且动态适应能力强。
급출일충고동태 GPS약신호포획산법。대접수도적위성신호，이1 ms 위보진주20차수거번전위고계，학정출단차적분시간위20 ms；이단차적분시간내상간손모소우1 dB위표준，학정단차적분중빈솔화마상위적수색보진；재제이급루가지전대다보륵빈편화도항수거진행동시보상，실현다급상간루가포획。모의일조위성신호，이용연건접수궤적설계진행방진험증，결과현시，해방법재신호공솔위-180 dBW적정황하，포획소수적루가차수시상간-비상간방법적36.4%，차동태괄응능력강。
An acquisition approach is proposed for high dynamic and weak GPS signal.For the re-ceived satellite signals,the data inversion bit estimate is conducted 20 times in steps of 1 ms,and the single integration time is determined as 20 ms.Loss is less than 1 dB within a single coherent integration time is determined by the standard that the integration in a single frequency and code phase search step.The accumulation of Doppler shift and navigation data is simultaneously com-pensated before the second stage in order to achieve multi-level coherent accumulation capture.A simulation is conducted by using the design of software receiver and by simulating a set of satel-lite signal.The results indicate that,in the condition of -180 dBW signal power,the cumulative number by this approach is 36.4% that of by the coherent-noncoherent acquisition method and this approach also has better dynamic adaptability.