In-orbit verification system and method for satellite communication subsystem

摘要

The present invention relates to satellite systems, and more particularly, to providing new systems and methods for verifying in-orbit performance and operation of satellite communications subsystems. In contrast to conventional payload IOT (in-orbit test), the present invention operates without uplink signals by generating hardware specific signatures using internally generated isolated thermal noise To do. This noise has been found to provide a very stable and repeatable signal for testing. Prior to launch, a repeater command sequence is executed to generate a hardware specific signature based on internally generated noise. The same repeater command sequence is executed in the trajectory to determine if the hardware specific signature has changed. The two signatures can be recorded and compared using a simple tool such as a spectrum analyzer. The method also includes the new use of the sun as a test signal source for calibrating the device, quantifying atmospheric effects, and using it as an intermediate reference power level during measurements. [Selection] Figure 10