ska phase 1 system requirements specification - The Square ...

WP2‐005.030.000‐SRS‐002Revision : BIdent Requirement Applicability Parent VerificationSYS_REQ_1660Beam‐switching downtimeflagging. Observation data(specify: both uv(w)‐data and tiedarray beams) acquired during achange of beam direction shall beflagged.TBD3.6.5 Frequency switching agilityIdent Requirement Applicability Parent VerificationSYS_REQ_1670The SKA shall be able to ‘switchbetween observing frequencieswithin 10 minutes or less’ (in theband 0.8–3 GHz)‘near simultaneous access tomultiple frequencies’Mandatory [1]Paragraph6.4.4 andTable 6‐2[1] Table 8‐1Test3.7 Polarisation characteristicsIdent Requirement Applicability Parent VerificationSYS_REQ_1710Beam polarization stability. Thepolarization properties of thebeams shall be stable enough toallow their calibration to betterthan 0.5% (TBC)Ident Requirement Applicability Parent VerificationSYS_REQ_1720External calibrationmeasurements shall be necessaryat a rate of no more than onceper hour (TBC).TBDIdent Requirement Applicability Parent VerificationSYS_REQ_1730Stokes parameters. SKA1 shallprovide visibility data in all fourStokes parameters.TBDIdent Requirement Applicability Parent VerificationSYS_REQ_1740Instrumental polarisation. Thepolarisation introduced by theinstrument, after calibration, shallbe less than 0.5% of the totalintensity. (TBC)TBD2011‐02‐14 Page 19 of 58