Data Note · Orbital & Environmental Intelligence · Technology & Infrastructure

A radar satellite two space agencies spent a decade building finally flew

NISAR launched in July after antenna problems pushed the NASA-ISRO mission past its original 2024 target. Its dual-band radar can track land and forest change at a resolution and revisit rate no single-agency mission has matched.

July 2025 · Asia-Pacific

Retrospective analysis of July 2025. Published August 2026.

An ISRO GSLV rocket being rolled out to its launch pad at Satish Dhawan Space Centre

NISAR, a joint NASA-ISRO Earth observation satellite, launched on 30 July 2025 aboard ISRO's GSLV-F16 rocket from the Satish Dhawan Space Centre, after delays pushed the mission past its originally targeted 2024 launch when the satellite's 12-meter radar antenna reflector was sent back to NASA's Jet Propulsion Laboratory over overheating concerns. NISAR carries both an L-band radar, built by NASA, and an S-band radar, built by ISRO, the first satellite to fly dual-frequency synthetic aperture radar, letting it measure land surface and vegetation change with a level of detail neither agency's radar alone would provide.

The Signal

NISAR launched 30 July 2025 on ISRO's GSLV-F16 after delays from an antenna reflector issue pushed it past its original 2024 target, carrying the first dual-frequency (L-band and S-band) synthetic aperture radar flown on a single Earth observation satellite.

Why It Matters

A multi-year technical delay on a flagship joint mission is a reminder that even the best resourced Earth observation programs are not immune to the kind of single point of failure risk we flagged with MethaneSAT's loss the same year, hardware readiness, not funding or ambition, was NISAR's actual constraint.

The System Connection

Dual-band radar data is directly relevant to the land and agricultural monitoring thread we track under this category, L-band radar in particular penetrates vegetation canopy better than the higher frequency bands most existing satellites use, which matters for forest biomass and soil moisture measurement specifically.

Development Implication

Long horizon land and forestry positions that have been waiting on better canopy penetrating radar data now have a live data source to evaluate, once NISAR completes commissioning and data begins flowing to end users.

What We Are Watching

  • NISAR's commissioning timeline and when its data becomes available to commercial and research users.
  • Whether the dual-band approach demonstrates a measurable advantage over single-band radar missions already in service.
  • Any further hardware issues during the mission's commissioning phase, given the antenna problems that delayed launch.
Sources reviewed
Last checked August 2026
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