The present invention relates to satellite systems and more particularly, to the provision of novel systems and methods for verifying the in-orbit performance and operation of satellite communications subsystems. In contrast to traditional Payload IOT (in-orbit test), the invention operates without an uplink signal, by generating hardware-specific signatures using isolated, internally generated, thermal noise. It has been found that this noise provides a very stable, repeatable signal for testing. Prior to launch, a repeater command sequence is executed to generate a hardware-specific signature based on the internally-generated noise. The same repealer command sequence is then executed in-orbit to determine whether the hardware-specific signature has changed. The two signatures may be recorded and compared using a simple tool such as a spectrum analyzer. The methods also include novel use of the sun as a test signal source to calibrate equipment, to quantify atmospheric effects and to be used as an intermediate reference power level during measurements.


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    Title :

    人工衛星通信サブシステムの軌道内検証システム及び方法


    Publication date :

    2022-12-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04B TRANSMISSION , Übertragung / B64G Raumfahrt , COSMONAUTICS