【摘要】 卫星导航定位系统的抗干扰技术研究意义重大。基于天线阵列的抗干扰技术需要同时采集多路GPS天线信号,而通用GPS接收机大多只能接收单路天线信号,难以满足需求。为此,设计了一种四元天线阵列的GPS抗干扰射频前端。通过四元天线阵列分别接收四路GPS信号,经过低噪声放大器、射频滤波器、下变频到中频信号,以供给后级A/D采样,经抗干扰模块后达到抗干扰目的。最后,对此射频前端进行整体电路测试,并给出了测试结果。经实际应用,验证了该系统方案的可行性。更多还原

【Abstract】 Global Navigation Satellite System( GNSS) is of great significance for anti-interference research. The signal acquisition of anti-interference technology based on antenna array needs multiplex signals, which is difficult for the general signal channel Radio Frequency( RF) front-end. The system was designed for the GPS anti-jamming RF front-end of four-element antenna array. The system received four channels of GPS signals through the four-element antenna array. After the processing of a low noise amplifier,RF filters, RF chip of GP2015 and down-conversion, the received GPS signals was transformed into the intermediate frequency sig-nal, which was supplied to the A/D sampling behind. Besides, the sampling data was sent to anti-jamming modules to realize an-ti-jamming. Device selection for each unit is described in detail. Finally, the RF front-end of the whole circuit was justified. The feasibility of the system is verified by practical application.更多还原