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About SAOCOM
The SAOCOM (SAtélite Argentino de Observación COn Microondas) satellite series represents Argentina's approved polarimetric L-band SAR (Synthetic Aperture Radar) constellation of two spacecraft, a program defined, managed and operated by CONAE (Comisión Nacional de Actividades Espaciales), Argentina's Space Agency, Buenos Aires. The SAOCOM-1 mission is composed of two satellites (SAOCOM-1A and -1B) launched consecutively. The overall objective of SAOCOM is to provide an effective Earth observation and disaster monitoring capability.
The SAOCOM requirements call for a capability to provide timely information in support of natural and anthropogenic disaster management (such as regional flooding, volcanic eruptions, earthquakes, landslides, forest fires, etc.), and to conduct monitoring services for agriculture, mining and ocean applications - including monitoring surveys of Antarctica (study of continental glacier evolution, global change indicators, etc.). The goal is to obtain data with high-quality radiometric and geometric accuracy (e.g. natural resources identification, interferometry, glaciology), and to provide also high revisit frequencies (daily) in support of specific operational requirements.
Launch Date | 1A: 7 October 2018 1B: 30 August 2020 |
Orbit Height | 620 km |
Orbit Type | Sun-synchronous nearly circular frozen polar |
Nominal Local Time at Ascending Node | 6:12 AM |
Orbit Inclination | 97.89° |
Orbit Period | 97.2 min |
Repeat Cycle | 16 days (1 satellite) / 8 days (constellation) |
In agreement with ASI (Italian Space Agency), ESA advertises the availability of SAOCOM data acquired over the ASI Zone of Exclusivity (Europe and Mediterranean basin) via the ASI SAOCOM data hub.
SAOCOM Objectives
The main SAOCOM mission objective is to satisfy the needs of Argentinean society, economic and productive sectors, and the National Space Program. These goals support:
- Agriculture
- Hydrology-including floods and emergencies
- To generate operative soil moisture maps
- To exploit SAR interferometric capability
Moreover, the SIASGE System, obtained by the integration of Argentine-Italian SAOCOM Constellation and the Italian COSMO-SkyMed Constellation, implements a double band (X+L) SAR joint mission between ASI and CONAE.
SAOCOM Instrument
Type | Synthetic Aperture Radar (SAR) |
Center Frequency | 1275 MHz (L-band) |
Maximum Bandwidth | 50 MHz |
Transmit Peak Power | 6.7 kW |
Operational Modes | StripMap TopSAR |
Swath Width | 13 - 67 km (beam dependent) for StripMap 109 - 389 km (beam dependent) for TopSAR |
Polarization Modes | Single, dual or quad polarization (technological Compact Polarization modes also available) |
NESZ (Noise Equivalent Sigma Zero) | < -34 dB for StripMap and TopSAR quad polarization modes < -28dB for StripMap and TopSAR dual and single polarization modes |
Antenna Looking Angle | left or right side of path (right side is default) |
Incidence Angles | 18-50° |
Data Quantization | 4 bit Block Adaptive Quantization |
Duty Cycle | 15% (about 15 minutes per orbit, depending on selected datatakes modes datarate and available ground stations) |
The parameters for each acquisition mode are summarised below.
Acquisition Mode | Polarization Mode | Swath Width | Spatial Resolution | Incidence Angle Range (min) |
Stripmap | Single (SP), dual (DP) or quad (QD) | SP & DP: 30 km - 67 km QP: 13 km - 30 km | QP: 10 m el x 6 m az (L1A SLC) DP & SP: 10m el x 5 m az (L1A SLC) | SP & DP: 21° - 50° QP: 18° - 35° |
TopSAR narrow | Single (SP), dual (DP) or quad (QD) | TNA QP >109 km TNB QP >108 km TNA DP & SP >174 km TNB DP & SP >150 km | QP: 10 m el x 50 m az (L1A SLC) DP & SP: 10 m el x 30 m az (L1A SLC) | TNA QP: 18°- 27° TNB QP: 27°- 35° TNA DP & SP: 25°- 38 TNB DP & SP: 38°- 47° |
TopSAR wide | Single (SP), dual (DP), quad (QP), or compact (CP) | TW QP >217 km TW DP & SP & CP >352 km | QP: 10m el x 100m az (L1A SLC) DP & SP: 10m el x 50 m az (L1A SLC) | TW QP: 18°- 35° TW DP & SP: 25°- 48° |