In case of ground station non-visibility, all the three bands may be recorded and played back according to station availability. The overall S/C size is about 2 m in diameter and 2.1 m in height. • The first images of ResourceSat-2 were acquired on April 28, 2011 by ISRO. The PDHS of the ResourceSat-2 spacecraft essentially consists of two subsystems – BDH (Baseband Data Handling) and the X-band data transmission system (Ref.
The sensor complement is identical to that of the ResourceSat-1 mission. The VNIR CCD array features 6,000 elements for each band. with star trackers - 4 reaction wheels (5 Nms); 8 x 1 N & 4 x 11 N hydrazine thrusters; 2 magnetic torquers - Pointing accuracy: ≤ 0.05º (3σ); drift rate: ≤ 5 x 10-5 º/s (3σ) - Spacecraft is steerable up to ±26º in cross-track, Table 1: Overview of ResourceSat-2 spacecraft parameters, Figure 3: Stowed configuration of ResourceSat-2 (image credit: ISRO), Figure 4: Photo of the PSLV-16 integrated payloads of ResourceSat-2, X-Sat and YouthSat (image credit: ISRO) 6), Launch: ResourceSat-2 was launched on April 20, 2011 on the PSLV-C16 launcher from SHAR (Satish Dhawan Space Centre, Sriharikota), India. 17), • Immediately after the injection of the satellite, the two solar panels were deployed.
Each calibration cycle consists of 2048 lines providing six non zero intensity levels. The SWIR CCD is a new device employing a CMOS readout technique for each pixel, thereby improving noise performance. The total S/C mass at launch is ~1200 kg, including fuel for five years of operation. • ResourceSat-2 and its payload are operating nominally in 2012. These LEDs are operated in pulsed mode and the pulse duration during which these LEDs are ON is varied in specific steps. • ResourceSat-2 and its payload are operating nominally in 2013. Careers | Help, PUBLIC NOTICE - ATTENTION : JOB ASPIRANTS, Copyright © 2020 ISRO, All Rights Reserved. • S-band data downlink (frequency: 2.280 MHz, output power = 5 W, modulation = QPSK, data rate = 16 Mbit/s). RESOURCESAT-2 is a follow on mission to RESOURCESAT-1. The payload module in turn is comprised of a two-tier system, the payload module deck and the rotating deck. LISS-4 features in addition a ±26º steering capability in the cross-track direction permitting a 5-day revisit cycle. These LEDs are driven with a constant current and the integration time is varied to get 16 exposure levels, covering the dynamic range in a sequential manner.
LISS-4: 5.8 m resolution, Swath: 70 km (Mono and Mx Mode), 10 bit radiometry, 3 Bands (B2: 0.52 – 0.59 µm; B3: 0.62 – 0.68 µm; B4: 0.77 – 0.86 µm), LISS-3: 23.5 m resolution, 141 km swath, Radiometry: 10 bit (VNIR) and 7 bit (SWIR), 4 Bands (B2: 0.52 – 0.59 µm; B3: 0.62 – 0.68 µm; B4: 0.77 – 0.86 µm, B5: 1.55 – 1.70 µm), AWiFS: 56 m resolution at nadir and 70 m resolution at off-nadir, 740 km swath, 12 bit radiometry, 4 Bands (B2: 0.52 – 0.59 µm; B3: 0.62 – 0.68 µm; B4: 0.77 – 0.86 µm, B5: 1.55 – 1.70 µm), AIS (Automatic Identification System) in two frequencies of 161.975 MHz and 162.025 MHz, Copyright © Vikram Sarabhai Space Centre 2017, Currently are 32 guests and no members online, 3-axis body stabilised using Earth Sensor, Star Sensor, Magnetometer, Reaction Wheels, Magnetic Torquers and Hydrazine Thrusters, Solar Array generating 1250 W at End Of Life backed by 2 Ni-Cd batteries of 24 AH capacities each, Site Last Updated: Wednesday 21 October 2020. Spacecraft Launch Mission Status Sensor Complement References. Provide continued remote sensing data services on an operational basis for integrated land and water resource management at a micro level with enhanced multispectral/ spatial coverage and stereo imaging.
13) 14), • The ResourceSat-2 commissioning phase ended in late June 2011.
The instrument has a mass of 169.5 kg, power of 216 W, and a data rate of 105 Mbit/s. RF communications: TT&C communications in S-band with downlink data rates of 1-16 kbit/s; modulation: PCM/PSK/PM. 2) M. Venkata Rao, J. P. Gupta, Ram Rattan, K. Thyagarajan, “ResourceSat-2: a mission for Earth resources management,” Proceedings of SPIE, 'GEOSS and Next-Generation Sensors and Missions,' Vol. A phasing of 180º is realized with regard to the ResourceSat-1 satellite.
bands namely visible and near infrared (B2, B3 and B4). In the 23 km Mx mode, all three bands for a swath 23 km from a selected position in 70 km may be downloaded. The three Imaging Cameras have been oriented towards Earth. • Operating in the VHF maritime band (160 -162 MHz), - standardized digital communication protocols, - each station transmits and receives over two radio channels to avoid interference problems, • Transmissions use 9.6 kbit/s with GMSK/FM modulation, • Uses SOTDMA (Self-Organizing Time Division Multiple Access) technology to meet this high broadcast rate and ensure reliable ship-to-ship operation. Each module covers a swath of 370 km providing a combined swath of 740 km with a side lap between them. 9). Each ResourceSat satellite carries three electrooptical cameras as its payload: LISS-3, LISS-4 and AWiFS. It will give regular micro and macro information on land and water bodies below, farm lands and crop extent, forests, mineral deposits, coastal information, rural and urban spreads besides helping in disaster management. BDH for the LISS -3 formatter receives seven bit DPCM encoded data, multiplexes the different band data, and formats them into frames along with auxiliary information. The bottom of cylinder is attached to an interface ring which interfaces with the launch vehicle. Like ResourceSat-1 spacecraft, ResourceSat-2 also has two separate downlink chains in X-band, both operating at 105 Mbit/s data rate. In this mode of operation, each line of image is electronically scanned and contiguous lines are imaged by the forward motion of the satellite. The payload module deck accommodates LISS-3, AWiFS-A and AWiFS-B camera modules. AWiFS is a wide-angle medium resolution (56 m) camera with a swath of 740 km (FOV=±25º) of WiFS heritage.
The LISS-4 data are transmitted on carrier-1 at 8125 MHz and LISS-3 + AWiFS data are transmitted on carrier-2 at 8300 MHz.
Each spectral band has 12K element linear CCDs, each having a pixel size of 7µm x 7µm. Mono mode provides 70 km of swath and any one of the band may be selected for download. BDH subsystem: The BDH receives LISS-3, LISS-4 and AWIFS payload data, formats them suitably along with auxiliary information and send the data to X-band or SSR system for downlink transmission or recording, respectively. The ResourceSat data find their application in several areas like agricultural crop discrimination and monitoring, crop acreage/yield estimation, precision farming, water resources, forest mapping, rural infrastructure development, disaster management etc. 16).
Unlike ResourceSat-1, where each chain was dedicated to LISS-4 and LISS-3/AWiFS, in ResourceSat-2, there exists flexibility of downlinking payload data through any one of the chains. It flows from west to east and empties in the Bay of Bengal in the state of Andhra Pradesh on the east coast of India.
Figure 12: Photo of the AWiFS camera assembly (image credit: ISRO). For the SWIR band, the calibration sequence is similar to that of LISS-3 through a repetitive cycle of 2048 scan lines. The S/C design life is 5 years. 5ºC ± 5º 20ºC ±3º 0-40ºC, Power system Solar array Battery Power electronics, - 6 Solar panels (1.4 x 1.8 m2 each) generate 1250 W of power at EOL - 2 x 24 Ah NiCd batteries - Two Raw buses 28 to 42 V; discrete and hybrid DC-DC converters, AOCS Attitude sensors Actuators Pointing S/C pointing capability, - Earth sensors, digital sun sensors, star trackers, 4π sun sensors, gyroscopes AD accuracy 0.1º with Earth sensors 0.006º.
- RS-2 AWiFS preliminary analysis show discrepancies compared to the reference GLS dataset (this was confirmed by IAS and visual inspection). The LISS-4 camera is mounted on a rotating deck which is attached to a PSM (Payload Steering Motor) which can rotate by ± 26º to provide an event monitoring capability. RESOURCESAT-2 Launched: 2011 Organisation: ISRO - India Launched 20 Apr 2011 High polar sun-synchronous orbit LISS-4 is a three-band pushbroom camera of LISS-3 heritage (same spectral VNIR bands as LISS-3) with a spatial resolution of 5.8 m and a swath of 70 km. The Odd and Even The pushbroom instrument operates in three spectral bands which are identical to two VNIR bands (0.62 - 0.68 µm, 0.77 - 0.86 µm) and the SWIR band (1.55-1.70 µm) of the LISS-3 camera. Each ResourceSat satellite carries three electrooptical cameras as its payload: LISS-3, LISS-4 and AWiFS. BDH for LISS-4 camera: The LISS-4 camera features three bands B2, B3, B4, the output is encoded according to DPCM (Differentially Pulse Code Modulation).
It covers more than 105,000 km2. 15). It is intended to continue the remote sensing data services to global users provided by RESOURCESAT-1, and to provide data with enhanced spatial coverage, by enhancing the LISS-4 multispectral swath from 23 km to 70 km. The PDHS receives the digital data from each camera in bit parallel - byte serial mode, formats it with auxiliary data, modulates it on the RF carrier and transmits to the ground.
RESOURCESAT-2 also carried an additional payload known as AIS (Automatic Identification System) from COMDEV, Canada as an experimental payload for ship surveillance in VHF band to derive position, speed and other information about ships. Carryout studies in advanced areas of user applications to take full advantages of increased spatial and spectral resolution.
For the VNIR bands (B2, B3, B4), the calibration is a progressively increasing sequence of 16 intensity levels through exposure control.
ResourceSat-2 and ResourceSat-2A satellites of ISRO.
Band name Band with from [μm] Badn width to [μm] Code Maximal resolution [m] Uplink frequency: 2071.875 MHz, downlink frequency: 2250 MHz. RESOURCESAT-2 carries two Solid State Recorders with a capacity of 200 Giga Bytes each to store the images taken by its cameras which can be read out later to ground stations.
The secondary payloads on this mission are: 7) 8), Orbit: Sun-synchronous orbit, Altitude = 817 km, inclination = 98.78º, period = 101.35 minutes, local time of equator crossing at 10:30 AM on descending node. RESOURCESAT-2 also carried an additional payload known as AIS (Automatic Identification System) from COMDEV, Canada as an experimental payload for ship surveillance in VHF band to derive position, speed and other information about ships.
ResourceSat-2. Observation of the Earth and its Environment.
Like its predecessor ResourceSat-1, there exists downloading of data either in mono or 23 km Mx mode.
Figure 13: Block diagram of the PDHS (image credit: ISRO), HIP-1 is an (auxiliary) AIS (Automatic Identification System) payload of COM DEV International Ltd., Cambridge, Ontario, Canada. The major objectives of Resourcesat-2:
All the three imagers are multispectral pushbroom scanners with linear array CCDs as detectors. Feedback | (1 acquisition unit = 99 seconds), • Data acquisition over pre-determined segments of an orbit uplinked as acquisition profile, • Acquisition profile to be uplinked for every orbit, • Receivers will be switched on/off based on the profile command (1/0), • Profile holds good till another profile is uplinked, • Data to be downloaded over 2/3 stations: Svalbard, Bangalore (ISTRAC), TBD.