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。。The China Brazil Earth Resources Satellite (CBERS) was jointly developed by China and Brazil since 1988. The first CBERS (CBRES-1) was successfully launched on October 14, 1999. After finishing on-orbit tests in China, it was relegated to China Center for Resources Satellite Data and Application (CRESDA) and switched to application and routine operation stage.
。。There are 3 kind cameras on the CBERS-1. They can make optical observation for global area and transmit remotely sensed data to ground receiving stations in high speed. After processes these data, CRESDA provides their end-users various image production.

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。。Orbit: sun-synchronous recurrent and frozen orbit
。。Mean altitude: 778Km
。。Local time at descending node: 10:30 AM
。。Repeat cycle :26 day
。。Repeat cycle: 100.26 min

。。Revolution/Day: 14+9/26
。。Inter-track distance: 107.4 Km
。。Time interval between adjacent track: 3 days

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。。·Three sensors:
。。☆Charge Coupled Device Camera (CCD)
。。☆Infrared Multi-Spectral Scanner (IPMSS)
。。☆Wide Field Imager (WFI)
。。·High Density Digital Recorder (HDDR)
。。·Data Collection system (DCS)
。。·Space Environmental Monitor (SEM)
。。·Data Transmission System (DTS)
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。。The CCD Camera has a nadir spatial resolution of 19.5 meters and a swath width of 113Km. It has four spectral bands in the visible and near infrared range and one panchromatic band. The maximum side-looking angle is ±320 .It can perform on-orbit focal length adjusting and onboard calibration using internal lamp calibration system.

。。The IRMSS instrument has spatial resolution of 78 meters(for three visible to short-wave infrared spectral bands) and 156 meters(for one thermal infrared band). It has internal lamp calibration system as well as a solar calibration system. Its swath width is 119.5 Km.

CBERS-1 Sensor Characteristics

	。。The WFI camera has a nadir spatial resolution of 256 meters in two visible to near-infrared spectral bands. It has a swath width of 890 Km. It s relatively wider swath makes it possible to achieve repeated ground coverage in a short time period. The On-board calibration system on WFI consists of a diffuse reflective window for relative radiometric calibration. The key property parameters of these three sensors aboard the CBERS-1 given in Table 1。。。Besides the above three types of sensors, the CBERS-1 is also equipped with a high density magnetic recorder for recording CCD data of the interested area. When the CBERS-1 is in the range of a receiving station, the recorded CCD data on the satellite will be play back and received by the receiving station. The key parameters of the on-board high density magnetic recorder are as follows: 。。The speed of record/playback is 53 Mb/s, the ratio of error code is less than 1x10 -6, both the lengths of recording and playback are not less than 15 minutes。
	CCD	WFI	IRMSS

CBERS-1 Sensor Characteristics

Sensor Name	CCD camera	WFI	IRMSS
Sensor Type	Pushbroom	Pushbroom (split camera)	Scanner (forward and reverse)
VIS/NIR Bands	1: 0.45 to 0.52 2:0.52～0.59mm 3:0.63～0.69mm 4:0.77～0.89mm 5:0.51～0.73mm	10:0.63～0.69mm 11:0.77～0.89mm	6:0.50～0.90mm
SWIR Bands	None	None	7:1.55～1.75mm 8:2.08～2.35mm
Thermal Bands	None	None	9:10.4～12.5mm
Radiometric Quantization	8bit	8bit	8bit
Swath Width	113km	890km	119.5km
Samples/band	5812bands	3456bands	Bands 6, 7, 8: 1536; Band 9: 768
Spatial resolution (nadir)	19.5m	258m	Bands6、7、8:78m Bands9:156米
Side looking ?	Yes（-32°～+32°）	No	No
FOV	8.32°	59.6°	8.80°