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CBERS 4

NSSDCA/COSPAR ID: 2014-079A

Description

CBERS-4 is part of the China-Brazil Earth Resources Satellite Program to deliver remote sensing data for a variety of purposes and public access to Earth imagery. A project born in the 1980s, the CBERS cooperation between China and Brazil aims to make high-quality Earth observation data available for civilian purposes including environmental monitoring, resource assessments, urban planning, and natural disaster response and relief.

CBERS-4 is equipped with an Infrared System based on the Infrared Multispectral Scanner 2 (IRMSS), a scanning instrument that covers four spectral bands, a 0.5 to 0.9-micormeter panchromatic band, a 1.55 to 1.75-micrometer & 2.08 to 2.35-micrometer infrared band & a 10.4 to 12.5-micrometer thermal infrared band. IRMSS acquires images with a ground resolution of 40 meters for the panchromatic and infrared bands and 80 meters for the thermal infrared band. The instrument covers a ground swath of 120 Kilometers providing a full coverage image of Earth every 26 days.

The Advanced Wide Field Imager Camera (AWFI) – a pushbroom sensor, also covers four spectral bands: 450 to 520 nanometers (blue), 520 to 590nm (green), 630 to 690nm (red) and 770 to 890nm (near infrared). It has a field of view of 28.6 degrees and a focal length of 150 millimeters. The instrument has a wider ground swath of 866 Kilometers for full Earth coverage in five days. AWFI achieves a ground resolution better than 64 meters.

The Panchromatic and Multispectral Camera (PANMUX) is a high-resolution imager. It covers the following spectral bands: 510 to 850 nanometers (panchromatic), 520 to 590nm (green), 630 to 690nm (red), and 770 to 890nm (near infrared). Panchromatic images are taken with a ground resolution of 5 meters while the other bands have a 10-meter resolution. PANMUX can take images up to 32 degrees off-nadir to drastically increase its temporal coverage to just three days. The instrument covers a ground swath of 60 Kilometers

MUXCam, the Multispectral Camera, is a pushbroom-type instrument with a field of view of 4.4 degrees and a focal length of 506 millimeters. The optical system (entrance mirror, a window, a moving lens & 11 fixed lenses) along with the focal plane is facilitated within the 4.7-Kilogram RBNA system while the RBNB system includes thermal control electronics, the focus adjustment mechanism and the instrument calibration system. The RBNC system generates CCD reading clock signals, and includes output processing units and encoding systems that handle the payload data. MUXCam uses a 4-line array detector with 6000 pixels per line being 13 micrometers in size. The instrument covers four spectral bands: 450-520nm (blue), 520-590nm (green), 630-690nm (red) and 770-890nm (near infrared). MUXCam achieves a ground resolution of 20 meters covering a swath of 120 Kilometers. MUX Cam has a nominal revisit time of 26 days.

The Data Collection System terminal consists of a UHF antenna to receive messages from Data Collection Platforms deployed in remote locations on Earth. DCPs can be deployed virtually at any location on the globe to provide in-situ measurements of meteorological data that is then uplinked to satellites and transmitted to ground stations for collection, processing and distribution.

The DCPs operate in the UHF band at 401/402 MHz. These platforms include remote weather stations, buoys at sea to measure sea state and alert in the event of tsunamis as well as other measurement stations that are deployed in remote locations. Data received via the DCS UHF antenna at data rates of 100 to 300bit/s is relayed to the ground for processing and distribution.

CBERS-4 operates from a sun synchronous orbit of 778 Kilometers at an inclination of 98.5 degrees with a Local Time of Descending Node of 10:30 which provides favorable illumination characteristics for optical imaging. This orbit is creating a repeat cycles of 26 days,

Alternate Names

    Facts in Brief

    Launch Date: 2014-12-07
    Launch Vehicle: Long March 4B
    Launch Site: Taiyuan, Peoples Republic of China

    Funding Agencies

    • Unknown (Peoples Republic of China)
    • Unknown (Brazil)

    Discipline

    • Earth Science

    Additional Information

    Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

     
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