ALOS Data Users Handbook

ALOS Data Users Handbookof Δt becomes T/2.Table 3.4-10 Relationship between Time Tag, Line Counter, and Observation TimeTime Tag t 0 t 0 t 0Line Counter 0 1 2(output fromcompressor)Observation ( t0 −1)+ Δt(t0−1)+ nT t0+ Δt+ Tt0+ Δt+ 2TTime−T⋅ I ( j,g ) ⋅ I( a, j ) / 2 − T ⋅ ISTD( j,g)⋅ I(a,j)/ 2 −T⋅ I ( j,g ) ⋅ I( a, j ) /STDNote The last data at time (t 0 -1) The first data at time t 0 Data accumulated fromtime (t=t 0 +Δt+T) to(t=t 0 +Δt+2T)STD2t 0Reference TimeScan Start SignalΔtTTimet 0+Δtt 0+Δt+Tt 0+Δt+2Tt 0+Δt+3TT ⋅ I STD( j,g)⋅ I(a,j)Accumulation ofelectric chargeImage DataAction ofAVNIR-2Electriccharge transA/D convMultiplexingOutput fromAVNIR-2Line Countern 01 23Time Tagt 0t 0t 0t 0Output fromCompressorLine CounterTime Tag0t 0t m2 31t 0t 0t 0Figure 3.4-18 Time Determination of Observation Datab) Time Determination of each Line1) IndefinitenessIndefiniteness (Δt) emerges since the reference signal and the scanning start signal are asynchronous, andthe range of the value is 0