HsPWM Satellite Navigation Signal Generation and Analysis

The distortion caused by the non-ideal characteristics of satellite navigation signal generation channel has increasingly become an important aspect that effects the further improvement of navigation signal quality, especially the com-plex linear and nonlinear distortion introduced by power amplifier. One way to solve this problem is to strictly control the characteristics and states of power amplifiers and other devices, but the cost is huge. The second method is using system level solutions such as predistortion to conduct accurate modelling and compensation through training and learning. This method consumes a lot of no-board resources and requires high algorithm reliability due to the introduction of more complex processing in the signal generation link, so its use is greatly restricted. To solve these problems, we can use time-domain high-speed pulse width modulation (HsPWM) method to generate navigation signals. The method has a more deterministic distortion, which can solve this problem to a certain extent. At the same time, 2-level generation in the time domain can eliminate DAC, frequency converter and input filter, and use digital power am-plifier. As the channel links are reduced and the familiarity rate is improved, it can be flexibly configured and continuously optimized and upgraded.