Abstract: The researches on double mode receivers have become hot points when several constellation systems are completed.The design project of double receiver on GPS/GLONASS is given.GPS/GLONASS signals acquisition is researched in low signal to noise ratio circumstance.GLONASS signals and GPS signals are detected using a FFT-based fast acquisition algorithm and coherent integration with non-coherent integration acquisition algorithm.Finally，signal acquisition algorithm of double receiver is simulated using real signals.It can be seen that GPS/GLONASS double mode receiver is capable of detecting satellite signals in low signal to noise ratio environment，and improves receiver sensitivity.

摘要： 随着多星座系统的组建完成，双模接收机已经成为了研究的热点。给出了GPS/GLONASS双模接收机的总体设计方案，重点研究了低信噪比环境下GPS/GLONASS信号捕获，采用基于快速捕获的FFT算法和相关累加结合非相关累加捕获算法分别对GLONASS信号和GPS信号进行检测。利用真实数据对双模接收机的信号捕获算法进行了仿真分析，结果表明双模接收机能够捕获低信噪比环境下的卫星导航信号，提高了接收机的灵敏度。