The　Soil　Moisture　Active-Passive　(SMAP)　satellite　is　the　only　satellite　with　a　large　deployable　space　eccentric　rotating　ring　truss　antenna　clamped　along　a　generatrix　and　rounding　a　parallel　axis.　However,　the　active　radar　of　SMAP　satellite　stopped　working　within　months　of　its　launch.　What　are　the　reasons　leading　to　so　dramatic　consequences?　It　is　a　possibility　that　the　satellite　damage　is　caused　by　vibration.　In　this　paper,　the　nonlinear　breathing　vibrations　of　the　large　deployable　space　eccentric　rotating　composite　laminated　ring　truss　antennas　with　the　large　radius　are　studied　from　a　theoretical　analysis　of　view.　Referring　to　the　equivalent　model　of　the　continuum　circular　cylindrical　shell　clamped　along　a　generatrix,　we　propose　a　dynamic　model　of　the　eccentric　rotating　composite　laminated　circular　cylindrical　shell　subjected　to　the　lateral　and　the　temperature　excitations.　Considering　an　eccentric　rotating　composite　laminated　circular　cylindrical　shell　clamped　along　a　generatrix　and　rounding　a　parallel　axis,　the　nonlinear　partial　differential　governing　equations　of　motion　are　established　by　using　Donnell　thin　shear　deformation　theory,　von　Kármán-type　nonlinear　relation　and　Hamilton＇s　principle.　The　nonlinear　ordinary　differential　governing　equations　of　motion　are　obtained　by　using　Galerkin　discretization.　Based　on　the　theoretical　model,　the　nonlinear　breathing　vibrations　of　the　equivalent　model　are　studied　for　the　SMAP　satellite　antenna　subjected　to　the　lateral　and　the　temperature　excitations　for　the　first　time　in　this　paper.　Firstly,　the　effects　of　different　parameters　on　the　toggle　condition　of　1:2　internal　resonance　are　studied.　The　effects　of　the　radius　and　the　eccentricity　ratio　on　the　natural　frequencies　are　not　obvious　for　the　eccentric　rotating　composite　laminated　circular　cylindrical　shell.　Furthermore,　it　is　also　found　that　the　influence　of　the　thickness　and　the　eccentricity　ratio　on　the　resonant　rotating　speeds　cannot　be　ignored　for　the　eccentric　rotating　composite　laminated　circular　cylindrical　shell.　Then,　based　on　the　case　of　1:2　internal　resonance　and　principal　parametric　resonance-1/2　subharmonic　resonance,　the　parametric　excitation　T　is　selected　as　the　controlling　parameter　to　discover　the　nonlinear　breathing　vibrations　of　the　eccentric　rotating　composite　laminated　circular　cylindrical　shell.　The　periodic　and　chaotic　motions　of　the　equivalent　model　for　the　SMAP　satellite　antenna　are　found　when　the　rotating　speed　corresponds　to　the　internal　resonant　point　at　the　certain　excitations　for　different　lateral　and　temperature　excitations.　Therefore,　the　chaotic　motions　of　the　SMAP　satellite　antenna　occur　under　the　combined　action　of　temperature　parameter　excitation　and　lateral　excitation　in　the　space　environment.　According　to　the　research　results　of　this　paper,　the　active　radar　of　the　SMAP　satellite　may　be　damaged　by　severe　nonlinear　vibrations.　We　reasonably　speculate　that　the　failure　of　the　active　radar　for　the　SMAP　satellite　antenna　is　caused　by　the　nonlinear　vibrations　in　1:2　internal　resonance.　Thus,　this　paper　not　only　provides　a　possible　analysis　for　the　failure　of　the　SMAP　satellite,　but　also　provides　the　theoretical　guidance　for　study　of　similar　ring　truss　antennas.　This　research　has　important　theoretical　significance　and　engineering　value.　©　2019,　Science　Press.　All　right　reserved.