Compass B1 signal Double-channel union tracking loop design in urban area application

The B1 signal of Compass has opened its service to Asia-Pacific region which provide the service of navigation, timing and location. One of the main applications of Compass is to navigate in urban area. However, as there are a lot of huge Building, large overpass and trees which will blank and weaken the signal to -150dBm, or even to -160dBm, far less than the designed -130dBm, the receivers cannot receive the signal formally. Furthermore, the block and attenuation change in real time, it is difficult for receiver to work well in urban area. In the paper, a novel one satellite double-channel tracking method is designed according to the real urban situation and the single antenna handhold receiver property. When the power of the signal begins to decrease, the two channels will process the signal with loop keeping method and special designed weak signal tracking method respectively. After real urban test, it is proved that the new method will help the location to be more available.