RADARSAT's Beams - Ground Geometry

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.

Note that swath widths are somewhat reduced when the data are recorded rather than downlinked in real-time.

RADARSAT-1 Modes:	Near Range Incidence Angle	Far Range Incidence Angle	Near Range Resolution (m)	Far Range Resolution (m)	Near Ground Range (km)	Far Ground Range (km)	Swath Width (km)
Standard Beams:
ST1	19.60	27.06	27.61	20.35	254.88	363.18	108.30
ST2	24.23	31.25	22.56	17.85	320.93	428.87	107.94
ST3	30.47	36.94	27.25	22.99	416.41	526.29	109.87
ST4	33.64	39.67	24.94	21.64	468.64	576.88	108.24
ST5	36.54	42.23	23.21	20.56	519.00	627.32	108.32
ST6	41.46	46.58	20.87	19.02	611.88	720.21	108.33
ST7	44.87	49.42	19.58	18.19	682.45	786.86	104.41
Wide Beams:
WD1	20.00	31.25	40.40	26.64	260.45	428.87	168.42
WD2	30.81	39.55	26.97	21.70	421.87	574.58	152.71
WD3	39.25	45.17	21.84	19.48	568.85	688.92	120.07
Fine Resolution Beams:
FN1	36.93	40.13	8.88	8.27	526.07	585.71	59.64
FN2	39.38	42.33	8.41	7.92	571.36	629.30	57.94
FN3	41.60	44.26	8.03	7.64	614.55	669.44	54.89
FN4	43.56	46.09	7.74	7.40	654.60	709.25	54.65
FN5	45.39	47.82	7.49	7.20	693.81	748.57	54.76
Low Incidence Beams:
EL1	9.94	22.81	80.07	35.65	126.06	300.22	174.16
High Incidence Beams:
EH1	48.91	52.18	18.33	17.49	774.47	857.02	82.55
EH2	50.39	53.67	17.94	17.15	810.73	897.09	86.35
EH3	51.79	54.82	17.58	16.90	846.68	929.58	82.90
EH4	54.50	56.95	16.97	16.48	920.35	992.90	72.55
EH5	55.89	58.25	16.69	16.25	960.90	1033.73	72.84
EH6	57.34	59.48	16.41	16.04	1004.93	1074.33	69.40
ScanSAR Beams:
SWA(SW1):WD1,2,3, ST7	20.00	49.42	40.40	19.58	260.45	786.86	526.41
SWB(SW2):WD1,2, ST5,6	20.00	46.58	40.40	20.87	260.45	720.21	459.76
SNA(SN1):WD1,2	20.00	39.55	40.40	21.70	260.45	574.58	314.13
SNB(SN2):WD2, ST5,6	30.81	46.58	26.97	20.87	421.87	720.21	298.34

(Also see CSA's graphic of the RADARSAT SAR's operating modes.)

Differences in RADARSAT Beam Swaths:
Real Time vs Tape Recorded Data

Beam Mode	Nominal Real Time Downlink Swath (km)	Nominal Tape Recorded Downlink Swath (km)
Fine	50	43
Standard	100	100
Wide 1	165	164
Wide 2	150	138
ScanSAR Narrow	300	292
ScanSAR Wide	500	447
Extended High	75	70
Extended Low	170	170

(This information was obtained from a RADARSAT International manual titled, "RADARSAT Illuminated, Your Guide to Products & Services)