PPT Slide
- Normal Mapping Mode
- Expose/read/demodulate for 3 modulator rotations (4.8 seconds).
- Optionally, move the slit one step of 0.16 arcsec (takes 0.1--0.2 sec).
- Reduce I/Q/U/V spectra to 12 bits by shifting or look-up table.
- Send to MDP for compression and downlink.
- Raw data rate = 218 kPixels/sec.
- 160” raster takes ~80 minutes, 320” raster takes ~160 minutes.
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- Fast Map Mode
- Expose/read/demodulate for 1 modulator rotation, step the slit 0.16 arcsec, Expose/read/demodulate for 2nd rotation and add results: 0.32” raster sample.
- On-chip sum 2 pixels in spatial direction (along slit): effective pixel size is 0.32” x 0.32”.
- Convert to 12 bits, send to MDP.
- Raw data rate = 146 kPixels/sec.
- 1” raster takes ~10.9 seconds, 160” arcsecond raster takes ~29 minutes.