一种四通道多系统、多模式兼容卫星导航接收机射频前端的设计

Design of a Four-channel Multi-system and Multi-mode Compatible RF Front-end for Satellite Navigation Receiver

针对目前全球卫星导航系统(GNSS)存在的抗干扰能力弱、环境适应性差等问题,提供了一种多通道、多系统、多模式兼容GNSS接收机射频前端的正向设计方法,该设计方法通过数理推导,获得产品性能指标与整个射频前端及各级电路的设计指标之间的定量关系,从而得到各种设计准则。研制了一款四通道多系统、多模式兼容GNSS接收机射频前端,该射频前端兼容了四路L1/B1的强抗干扰模式接收和一路G1的普通导航模式接收。通过实际投产和测试,测试结果与理论预测非常吻合,并将该射频前端进行整机装配试验,最终定位测试精度≤1 m,证明了该设计方法及射频前端产品的有效可行。

According to the problems of poor anti-interference ability and poor environmental adaptability of GNSS receiver,a forward design method of multi-channel,multi-system and multimode compatible RF front-end of GNSS receiver was proposed in this paper.In this method,the quantitative relationship between the product performance index and the design index of the whole RF front-end and the cascade circuits is obtained through mathematical derivation,and thus various design criteria are obtained.Then,a four-channel,multi-system and multi-mode compatible RF front-end of GNSS receiver is developed.The RF front-end is compatible with four-channel L1/B1 strong anti-interference mode reception and one-channel G1 common navigation mode reception.Finally,through the actual production and test of the product,the test results are precisely consistent with the theoretical prediction.At the same time,this RF front-end is assembly tested in whole machine,and the final positioning accuracy is less than 1 m,which proves that the design method and the RF front-end product are effective and feasible.