Indian Startup Builds Satellite‑Based Thermal Sensors To Spot Missiles

What’s Happening in Space‑Based Missile Detection?

India’s growing presence in the space arena is now adding a new layer to its defence capabilities. A start‑up, SatLeo Labs, founded in 2023 in Ahmedabad, is working on a constellation of fifteen satellites that will use advanced thermal imaging to spot missile launches and monitor high‑risk infrastructure. The company’s approach blends satellite technology with open‑source data, aiming to deliver quick, reliable alerts for both military and civilian users.

Meet SatLeo Labs

SatLeo Labs emerged from a team of engineers and scientists who saw a gap in India’s ability to track surface‑launched missiles in real time. The firm’s vision is simple: put thermal sensors in space and use the data to answer two big questions. First, can a missile launch be detected as soon as it starts? Second, can the system tell whether critical facilities like nuclear reactors are running or not?

With a plan to launch fifteen satellites, SatLeo Labs is positioning itself as a key player in space‑based surveillance. The company’s headquarters in Ahmedabad serve as a hub where the hardware is designed, and the software that turns raw images into actionable intelligence is developed.

The Heart of the System – Dual‑Band Thermal Sensors

At the core of each satellite is a dual‑band sensor that captures both medium‑wave infrared (MWIR) and long‑wave infrared (LWIR) radiation. MWIR is sensitive to heat signatures in the range of 3–5 µm, while LWIR covers 8–12 µm. Together, they provide a comprehensive picture of temperature variations across a wide area.

Alongside the infrared payload, a visible‑band camera is mounted on each satellite. The visible sensor adds context to the thermal images, helping analysts distinguish between different objects and background terrain. By combining infrared and visible data, the system can isolate a missile launch from other heat sources like industrial furnaces or natural geothermal activity.

How Open‑Source Data Helps Identify Ground Vehicles

“SatLeo Labs is also employing open‑source thermal signature data to support the identification of ground combat vehicle types, based on heat emissions associated with specific metals and components.” – Bhati, SatLeo Labs

The company leverages publicly available thermal databases to create a library of heat signatures for various metal alloys and vehicle components. When a satellite image shows a heat plume, the system cross‑checks the pattern against this library. This method allows analysts to infer not just that a vehicle is moving, but also whether it is a tank, a truck, or another type of equipment.

Applications Beyond Missile Detection

The technology’s versatility extends far beyond spotting missiles. Here are a few key use cases:

• Monitoring nuclear reactors and other critical infrastructure for abnormal thermal output.
• Tracking the movement of ground combat vehicles in conflict zones.
• Providing early warning of accidental fires or overheating in industrial facilities.
• Assisting disaster response teams by identifying heat anomalies after earthquakes or floods.

From Space to the Ground – How the Payload Works

Satellites orbit the Earth at an altitude that balances coverage and resolution. Each satellite collects data at a high frequency, generating a stream of images that are transmitted back to ground stations. On the ground, powerful processors analyze the data in near real time.

When a sudden spike in heat is detected, the system flags it and cross‑references it with known missile launch signatures. If the match is strong, an alert is sent to military command centers. The same pipeline can be used to check a reactor’s temperature against expected operating ranges, flagging any deviations that may indicate a malfunction.

Challenges on the Path Forward

Deploying a constellation of fifteen satellites is not without its hurdles. Launch costs, though decreasing, remain a significant expense. Managing the massive volume of data—each satellite can generate terabytes of imagery daily—requires robust bandwidth and storage solutions.

Regulatory approvals for both launch and data handling also add layers of complexity. SatLeo Labs must coordinate with Indian space authorities, as well as international partners if they intend to offer services to other countries.

India’s Space‑Based Defence Landscape

SatLeo Labs’ initiative fits into a broader strategy to strengthen India’s self‑reliance in defence technology. By developing indigenous space‑based surveillance, India can reduce dependence on foreign systems and gain a more timely response to emerging threats.

The company’s dual focus on military and civilian applications also opens up new commercial opportunities. Countries looking for cost‑effective, rapid‑response monitoring can benefit from satellite‑based thermal imaging without the need for ground‑based radar networks.

What Lies Ahead?

As the constellation takes shape, the next milestones include the first launch, on‑orbit testing of the sensors, and establishing a real‑time alert network. Once operational, the system will provide a new layer of situational awareness that complements ground‑based radar and other intelligence assets.

For India, the project signals a growing confidence in domestic space technology and a commitment to enhancing national security. For the global market, it demonstrates that smaller firms can deliver high‑impact solutions without the scale of traditional aerospace giants.