非传统热推进剂测量系统。Out of the most popular methods of propellant estimation, namely, bookkeeping, PVT (Pressure, Volume, Temperature) and the thermal propellant gauging (PGS) methods, the latter is most accurate at End-Of-Life (EOL). The thermal method uses tank temperature respond to tank heating in order to infer propellant load of the tank. Propellant tanks are supposed to have attached heaters in order to have the thermal propellant gauging method successful. The paper discusses method of thermal propellant gauging when propellant tanks don’t have installed heaters. It is shown that propellant gauging is possible even in this case. The biggest difference between conventional and unconventional thermal propellant gauging
lies in role of tank environment in propellant gauging. Unconventional thermal propellant gauging requires development of a much more accurate spacecraft model than one used for the conventional propellant gauging. The paper discusses the difference between approaches.