CCSDS 881.0-R-1, Spacecraft Onboard Interface ServicesâRFID ...

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DRAFT RECOMMENDED PRACTICE FOR RFID-BASED INVENTORY MANAGEMENT SYSTEMS2 OVERVIEW2.1 GENERALThis section provides an overview of important practical issues associated with theutilization of RFID technologies in support of inventory management systems for spacemissions. The following subsections present an overview of:– rationale and benefits of RFID for space-mission inventory management;– basic RFID nomenclature and operation;– important applicable protocol and transmission standards;– RF spectrum planning notes; and– the scope of interoperability to be achieved by adherence to recommended practicesspecified.The goal of specifying an RFID standard is to enable engineering projects to utilizeinteroperable communication protocols, potentially in agency cross-support scenarios, thatare standards-based.2.2 RATIONALE AND BENEFITSInventory management is a critical function in many aspects of space operations, in bothflight and ground segments. On the ground, thousands of controlled components andassemblies are stored in bond rooms across multiple centers and space agencies. Theseinventories are tightly controlled, typically using manual processes such as paper tags onindividual items or small collections of identical items, such as small bags with screws.Other ground operations also require complex inventories, including tracking all laboratoryand office equipment with significant value.Inventory management for flight applications entails an even greater degree of control, asimproperly substituted items and early depletion of certain items can be catastrophic. Mostshort duration missions do not involve restocking, so resupply logistics are non-existent, butinitial stocking and tracking of inventories is nonetheless quite important. For most longduration missions, resupply efforts are inherently complex, expensive, and infrequent.The utilization of RFID tagging improves inventory visibility, leading to increasedsituational (inventory level) awareness, a decrease in resupply mission cost, andimprovement in resupply mission efficiency.CCSDS 881.0-R-1 Page 2-1 October 2011
DRAFT RECOMMENDED PRACTICE FOR RFID-BASED INVENTORY MANAGEMENT SYSTEMS2.3 RFID NOMENCLATURE AND DEFINITIONSAn RFID system consists of readers (also termed interrogators) and tags.An RFID reader transmits information to an RFID tag by modulating an RF signal in adefined portion of the radio spectrum. Passive RFID tags receive both energy andinformation from the reader-transmitted RF signal, while active RFID tags provide their ownpower for radio transmission. Passive RFID tags respond to the reader-originated signal bymodulating the reflection coefficient of their antenna in a technique termed ‘backscatter’ toprovide an encoded informational response to the reader. See table 2-1 for standard RFIDtag classifications. Each RFID tag is designed to a specific protocol. The protocol defineshow the tag will communicate to the outside world. Built within the protocol are featuressuch as security (data encryption, lock abilities, etc.) and anti-collision algorithms.Table 2-1: RFID Tag ClassificationsClass Class Name Tag Functionality1 Strictly Passive Surface AcousticWave (SAW) RFID TagsPurely passive, containing neither abattery nor an IC chip2 Passive IC-Based RFID Tags Passive; incident RF energy rectified topower an IC3 Semi-Passive Tags Onboard battery powers some functions,but RF signal is typically backscatteredfrom incident field4 Active Tags Battery-powered, longer rangeThe performance characteristics of tag and reader devices may vary drastically because ofapplication factors as well as the particulars of the RF air interface (frequency, modulation,multiple access scheme, etc.). Of key concern is the matching of the various performancecharacteristics to the user application (reference [D5]).2.4 RF TRANSMISSION CHARACTERISTICSThere are several different versions of RFID that operate at different radio frequencies. Thechoice of frequency is dependent on the requirements of the application. Four primaryfrequency bands that have been allocated for RFID use include (see table 2-2 for associatedtransmission characteristics):a) Low Frequency (125/134 KHz) – LF: Most commonly used for access control andasset tracking;CCSDS 881.0-R-1 Page 2-2 October 2011
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CCSDS 881.0-R-1, Spacecraft Onboard Interface ServicesâRFID ...