CAJ | 학술논문

该文针对低信噪比(SNR)情况下信号捕获精度较低的问题提出一种基于伪码相位和载波频率的2维细化自适应捕获算法，该算法根据信号强度自适应调整频率步进值和捕获门限，首先对伪码相位和载波频率进行粗捕，在此基础上对捕获到的伪码相位方格和载波频率方格进行细化，再对伪码相位和载波频率进行细捕以提高捕获精度。该文对算法进行了理论分析和仿真验证，结果表明，该算法能提高捕获的伪码相位分辨率和载波频率分辨率，有效提高检测概率，适用于低信噪比和高精度要求下的信号快速捕获。
해문침대저신조비(SNR)정황하신호포획정도교저적문제제출일충기우위마상위화재파빈솔적2유세화자괄응포획산법，해산법근거신호강도자괄응조정빈솔보진치화포획문한，수선대위마상위화재파빈솔진행조포，재차기출상대포획도적위마상위방격화재파빈솔방격진행세화，재대위마상위화재파빈솔진행세포이제고포획정도。해문대산법진행료이론분석화방진험증，결과표명，해산법능제고포획적위마상위분변솔화재파빈솔분변솔，유효제고검측개솔，괄용우저신조비화고정도요구하적신호쾌속포획。
With regarding to the issue of the accuracy of the acquisition is worse under the noise in the low Signal to Noise Ratio (SNR) environment, a two-dimensional refinement adaptive algorithm based on the pseudo-code phase and the carrier frequency is proposed. The coarse acquisition of the pseudo-code phase and the carrier frequency are completed first under larger adaptive acquisition step and threshold. On the basis of the results of acquisition, the pseudo-code phase grid and carrier frequency grid are refined for the second precise acquisition, which can improve the accuracy of the pseudo-code phase and the carrier frequency. Theoretical analysis and simulation show that the algorithm is able to enhance the resolution of captured the pseudo-code phase and the carrier frequency and effectively improve the detection probability, and can be edge option in the low SNR and high precision requirement for quick acquisition.