Networked Warfare: Connecting Aircraft, Sea and Land

For much of the twentieth century, each military platform saw only what its own sensors detected. A fighter jet relied on its own radar, a frigate on its own, an anti-aircraft battery on its own detection range. Networked warfare inverts that starting point: the goal is for whatever a given sensor detects to be available, at sufficient quality, to whoever is best placed to act on it — even if that means a different platform or a different armed force altogether.

The idea was formulated in the United States in the 1990s as network-centric warfare, and it is now common doctrine within NATO. It is not a specific system but a way of organising sensors, communication links and decision-making.

The three elements of a combat network

Any architecture of this kind combines sensors that detect, data links that transport, and command systems that fuse the information and turn it into decisions. The difference between a good network and a mediocre one lies not so much in the sensors as in the latency and reliability of the links, and in the quality of the fusion.

Data links

The most widespread allied standard is Link 16, a tactical link that since the 1980s has allowed aircraft, ships and command centres to share a common tactical picture: friendly positions, detected contacts, target assignment. Its virtue is interoperability — used by dozens of countries and almost every allied platform — and its known limitation is that it is a relatively detectable link with modest capacity by today's standards.

That is why more recent designs add low-probability-of-intercept links, shorter-ranged and directional, intended to let a group of stealth aircraft share data among themselves without giving away their presence. On the F-35 that function belongs to the MADL (Multifunction Advanced Data Link), which the manufacturer and the Program Office publicly describe as a low-probability-of-detection-and-interception link between aircraft of the same type.

Sensor fusion

Fusion consists of integrating readings from different sensors — radar, electronic warfare systems, infrared and optical sensors, information received via data link — into a single track per object, rather than showing the pilot several uncorrelated detections. The intended result is to reduce workload: the operator sees one tactical picture, not one console per sensor. This is the feature Lockheed Martin and the air forces that operate the aircraft present as the F-35's defining trait, ahead of its aerodynamic performance.

What it enables in practice

Three capabilities are most often cited publicly. The first is fighter-to-fighter cooperation: a formation can divide sensor duties, with some aircraft emitting on radar and others remaining silent while drawing on the others' data. The second is the aircraft's role as an advanced sensor for naval and ground forces: in trials disclosed by the US Navy and by the programme itself, data from an F-35 has been integrated into the naval air-defence network to enable engagement of targets that the ship could not detect on its own. The third is the link with ground units and allied air defence, which extends the overall detection range without deploying additional radars.

The point is not that a single platform can shoot further, but that the network as a whole can: the shooter may be dozens of kilometres from the sensor that found the target.

Limits and vulnerabilities

A network is also an attack surface. Three problems recur throughout the public literature: dependence on the electromagnetic spectrum — a network that is jammed or detected loses its advantage —, the difficulty of interoperating across countries and generations of equipment, and the data burden: the volume of information generated demands processing infrastructure and bandwidth that is not always available in expeditionary operations.

There is also a less technical dependency: modern networked systems require periodic software updates and manufacturer support, an issue with political implications that has fuelled its own debates among purchasing countries.