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RADARSAT's Beams - Signal Parameters
NOTE: ASF is capable of processing all RADARSAT-1 beam modes to level 0 products. At this time calibrated level 1 data products are only available for standard beams, ScanSAR Wide B, and Fine Beam1. The remaining ScanSAR beams are available as uncalibrated products. NASA approved U.S. investigators may request aquisition of any RADARSAT-1 beam mode through ASF but need to be aware of the processing limitations. Please contact ASF User Services for more information (uso@asf.alaska.edu, 907-474-6166).
(All beams have HH polarization.)
|
|
| Avg. PRF
| Range Bandwidth
| Sampling Rate
| Typical Samples per Line
|
| RADARSAT Modes:
|
| (Hz)
| (MHz)
| (MHz)
| Real-Time Data
(105 Mbps)
| Recorded Data
(85 Mbps)
|
|
|
|
| Standard Beams:
|
| ST1
|
| 1316
| 17.28
| 18.467
| 6350
| 6350 |
| ST2
|
| 1276
| 17.28
| 18.467
| 7292
| 7292 |
| ST3
|
| 1354
| 11.58
| 12.927
| 5942
| 5942 |
| ST4
|
| 1315
| 11.58
| 12.927
| 6356
| 6356 |
| ST5
|
| 1275
| 11.58
| 12.927
| 6702
| 6702 |
| ST6
|
| 1334
| 11.58
| 12.927
| 7146
| 7146 |
| ST7
|
| 1276
| 11.58
| 12.927
| 7646
| 7646 |
| Wide Beams:
|
| WD1
|
| 1270
| 11.58
| 12.927
| 7254
| 7254 |
| WD2
|
| 1310
| 11.58
| 12.927
| 8526
| 8526 |
| WD3
|
| 1350
| 11.58
| 12.927
| 8118
| 8118 |
| Fine Resolution Beams:
|
| FN1
|
| 1300
| 30.002
| 32.317
| 7819
| 7819 |
| FN2
|
| 1270
| 30.002
| 32.317
| 8005
| 8005 |
| FN3
|
| 1330
| 30.002
| 32.317
| 7642
| 7642 |
| FN4
|
| 1315
| 30.002
| 32.317
| 7730
| 7730 |
| FN5
|
| 1300
| 30.002
| 32.317
| 7819
| 7819 |
| Low Incidence Beams:
|
| EL1
|
| 1345
| 11.58
| 12.927
| 7556
| 7556 |
| High Incidence Beams:
|
| EH1
|
| 1345
| 11.58
| 12.927
| 7556
| 7556 |
| EH2
|
| 1307
| 11.58
| 12.927
| 7777
| 7777 |
| EH3
|
| 1270
| 11.58
| 12.927
| 8005
| 8005 |
| EH4
|
| 1245
| 11.58
| 12.927
| 8167
| 8167 |
| EH5
|
| 1307.5
| 11.58
| 12.927
| 7774
| 7774 |
| EH6
|
| 1270
| 11.58
| 12.927
| 8005
| 8005 |
| ScanSAR Beams:
|
| SWA(SW1):WD1,2,3, ST7
|
| Variable
| 11.58
| 12.927
| Variable
| Variable |
| SWB(SW2):WD1,2, ST5,6
|
| Variable
| 11.58
| 12.927
| Variable
| Variable |
| SNA(SN1):WD1,2
|
| Variable
| 11.58
| 12.927
| Variable
| Variable |
| SNB(SN2):WD2, ST5,6
|
| Variable
| 11.58
| 12.927
| Variable
| Variable |
Notes:
- The Pulse Repetition Frequency (PRF) is given for each beam. The PRF frequencies are about 30 Hz higher for the 792 km altitude.
- The range bandwidth is the 3 dB power width of the transmitted radar pulse. The pulse waveform is linear fm ("chirp") and is 40 microseconds long for all three bandwidths. The bandwidths can not be selected for the beams differently from the valve shown in the table.
- The sample rates are tied to the chirp bandwidths.
- The maximum samples per line are calculated based upon the link rate, overhead data (auxiliary data, chirp replica, and frame overhead), and PRF. A fixed digitization window reduces the actual non-zero pixel values. The window size is set by the highest PRF using the data rate for the recorded mode (85 Mbit/sec). (The CDPF Spec. mentioned a maximum signal line length of 9600.) The numbers are reduced about 3% for the lower altitude due to the higher PRF's.
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