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针对中国区域定位系统(China area positioning system,CAPS)接收机采用圆极化天线接收极化信号时会引入3 d B的极化损失问题,提出一种基于双线性极化天线的信号合成捕获算法.该算法先对双线性极化天线接收的两路CAPS导航信号进行捕获,并根据捕获结果进行信号同步;进而利用最大信噪比合并来合成两路信号,从而提高接收信号的信噪比.通过实测数据分析表明,该算法得到的合成信号的信噪比比单路信号得到的信噪比增加1.5d B,提高了信号接收的灵敏度.
Aiming at the problem that the polarization loss of 3 d B is induced when the China regional positioning system (CAPS) receiver adopts a circularly polarized antenna to receive the polarization signal, a signal synthesis acquisition based on bilinear polarization antenna is proposed Algorithm.At first, the two CAPS navigation signals received by the bilinear polarized antenna are captured and the signals are synchronized according to the result of the acquisition. Then, the maximum SNR is used to combine the two signals to improve the signal-to-noise of the received signal The experimental results show that the signal-to-noise ratio of the composite signal obtained by the proposed algorithm increases by 1.5 dB compared with the signal-to-noise ratio obtained by the single-channel signal, which improves the sensitivity of signal reception.