CAJ | 학술논문

测量卫星导航信号在天线阵各阵元上的载波相位之差可用于卫星波达方向解算，但传统的各阵元独立跟踪算法在干扰条件下无法实现高精度跟踪且容易失锁。针对此问题，通过将天线阵各阵元的载波相位分解为公共的平均载波相位和低动态的残余载波相位，提出了一种联合载波跟踪算法。该算法利用平均载波相位为每个阵元共有的特点，通过对全部阵元的联合处理来提高其跟踪精度，同时通过缩小环路噪声带宽来提高残余载波相位跟踪精度。理论分析与仿真结果表明，该算法提高了波达方向解算所需的阵元间载波相位差的测量精度及跟踪灵敏度，四阵元天线阵在典型应用条件下，跟踪灵敏度提高4dB，相同载噪比下载波相位差测量精度提高3倍。
측량위성도항신호재천선진각진원상적재파상위지차가용우위성파체방향해산，단전통적각진원독립근종산법재간우조건하무법실현고정도근종차용역실쇄。침대차문제，통과장천선진각진원적재파상위분해위공공적평균재파상위화저동태적잔여재파상위，제출료일충연합재파근종산법。해산법이용평균재파상위위매개진원공유적특점，통과대전부진원적연합처리래제고기근종정도，동시통과축소배로조성대관래제고잔여재파상위근종정도。이론분석여방진결과표명，해산법제고료파체방향해산소수적진원간재파상위차적측량정도급근종령민도，사진원천선진재전형응용조건하，근종령민도제고4dB，상동재조비하재파상위차측량정도제고3배。
Carrier phase difference measurements for the same satellite navigation signal at each antenna array elements can be used to solve its direction of arrival (DOA).However,traditional tracking algorithms can only adopt separate tracking loops for each separate antenna element when moderate interference is present;these algorithms cannot obtain precise measurements and frequently become lose of lock.Aim to solve these problems,a joint carrier tracking algorithm which decomposed each element′s carrier phase to the common average part and the low dynamic residual part was proposed.For the average carrier phase,as it is commonly shared by each array element,its tracking accuracy can be improved by combining all the observation values of the whole array elements.For the residual carrier phase,its tracking accuracy can be improved by reducing the loop noise bandwidth.Theoretical analysis and numerical simulation show that the algorithm can significantly improve the measurement accuracy of carrier phase difference between elements needed by DOA estimation and tracking sensitivity.The tracking sensitivity of a 4 element antenna array with typical application conditions improves 4dB and the carrier phase difference measurement accuracy of it increases 3 times under the same carrier noise ratio.