卫星导航基带二次载波剥离跟踪技术

针对现代卫星导航接收机及OEM板低功耗、待机长等需求,本文提出一种卫星导航基带二次载波剥离跟踪技术。首先剥离原始中频,然后对残余载波进行跟踪。该技术可大幅度降低基带数据速率,减小数据量,在FPGA上实现时,复用单个跟踪通道即可完成对16颗卫星信号的实时跟踪。实验结果表明,二次载波剥离跟踪技术较传统跟踪技术节省了30%的硬件资源,且可达到以下性能指标:跟踪灵敏度-139d Bm,伪距测量精度0.5m,载波相位精度0.01m。

Technology of Second Carrier Discards Tracking for Satellite Navigation Base-Band

For the demand of low power and long standby in modern satellite navigation receiver and OEM board, a new technology of second carrier discard tracking for satellite navigation base-band is presented in this paper. Firstly, the original mid-frequency was discarded, and then the remaining carriers are tracked. The technology can greatly reduced the rate and sum of the base-band data. On FPGA realization, one tracking channel can track 16 satellites at the same time. The experimental result proves that the second carrier discard tracking technology can save 30% resources compare with the traditional tracking technology, it can achieve the following performance index: tracking sensitivity to 139dBm, the measure precision of pseudo-range to 0.5m, the precision of carrier phase to 0.01m.