BS ISO 22772:2020 pdf free.Space systems一Requirements of launch vehicle (LV) to electrical ground support equipment (EGSE) interfaces.
BS ISO 22772 This document provides requirements for launch system designers or interface designers regarding interfaces between LV and EGSE, which is used to support on-line processing. It defines electrical interface types, design requirements, environment requirements, verification methods (analyses and tests), and interface check operation requirements.This document is intended to minimize design costs and reduce risks from errors resulting from miscommunication. It does not limit LV or EGSE organizational requirements to specify a unique interface.5.3 Design principles The design principles are as follows. a] The interface signal definition shall be clear and unambiguous.b) A ready-made standard interface must be adopted to decrease the number of interface types.c The necessary provisions should be put in place for development and implementations of measures aimed at preventing mixes in connection between equipment communications and the same type component items.d] Electrical performance shall be matched between sources and loads.e)Isolation measures shall be taken to prevent mutual influences among the equipment or systems
under a failure state.f) Electromagnetic compatibility shall be considered, including but not limited to, filtering, shielding,
and grounding.g) Redundancy design shall be considered.h) Simulation analyses and test verifications shall be performed as part of the interface design process.i) Margins as specified by manufacturers or general safety considerations shall be preserved.j] xtensibility shall be considered.k) Frequency, power and other characteristics shall be considered to determine the configuration of the signal and power grounding, such as floating, single-point or multiple-point grounding,common or independent grounding, etc.1) Grounding continuity and resistance shall be considered to meet the application requirements.The bus interface is used to obtain test information and send control instructions via the data bus, such as Digital Time Division Command/Response Multiplex Data Bus, CAN Bus, FC Bus. Requirements shall include the following details.a) Bus type, transmission medium, and topology or structure shall be clearly defined. b) Communication mode, rate, distance, error rate, and protocol shall be explicitly determined. c Timeout processing method shall be designed to ensure no crash under communication failure.d) Bus network shall be matched when the rocket takes off.
e)Bus interface types shall be chosen according to LV to EGSE transmission distance.BS ISO 22772 pdf download.