Development of the Advanced Deep Space Transponder

We present the architecture and design of a new transponder to support deepspace and near-Earth missions in the post-2010 time frame. This transponder is designed to provide direct-to-Earth command and telemetry service; spacecraftto-spacecraft command and telemetry service; direct-to-Earth navigation in the form of coherent Doppler turnaround, sequential turn-around ranging, pseudo-noise regenerative ranging, and differential one-way ranging; and spacecraft-to-spacecraft navigation in the form of coherent Doppler turnaround and one-way pseudo-noise code ranging.