Abstract
For improving the anti-interference performance and compatibility of a navigation-augmented signal in future BeiDou Global Navigation Satellite Systems, a new modulation based on chirp subcarriers is proposed, named binary offset chirp carrier modulation, which is formed by multiplying a periodic binary chirp subcarrier with a spreading code signal. And it can make use of the time-varying frequency for shaping the spectrum and have superior performance in anti-interference, similar advantage in tracking accuracy, anti-multipath capability and compatibility compared with binary offset carrier modulations. The binary offset chirp carrier modulations proposed in this paper provide a potential signal design for the future low earth orbit (LEO) navigation-augmented Global Navigation Satellite Systems.
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