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What Is a Micro-Missile? How Small Guided Missiles Work

“Micro-missile” has no universal size definition. Here’s how small guided missiles work and what the historical Spike test reports establish.
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A “micro-missile” is an informal label for a very small guided missile, not a category with a universally established definition or size limit. A guided missile uses in-flight control to steer toward an intended target or intercept; how that control works varies by system.

What “micro-missile” means

Official sources describe guided weapons and particular miniature-missile programs, but the material available does not establish a single formal definition, cutoff in size or mass, or shared specification for “micro-missile.” The phrase is best read as a descriptive label. A documented small missile is an example, not a definition of the whole category.

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Guided distinguishes these weapons from unguided ones: guidance helps control a missile’s flight toward its intended target or intercept. Missile systems may also be classified by their launch environment and the type of target they are intended to engage. The Defence Research and Development Organisation (DRDO) provides this broad classification in its overview of missile systems.

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How a small guided missile works

At a high level, the process can be understood as a feedback loop. The exact components and architecture differ among systems, so this is a conceptual description rather than a blueprint for a generic micro-missile.

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  1. Target information: A sensor or seeker gathers information relevant to the target.
  2. Guidance: Guidance logic uses that information to assess whether the missile’s flight path needs correction.
  3. Control: Control surfaces or other mechanisms change the missile’s direction.
  4. Propulsion: Propulsion provides the movement needed for flight.

These functions work together, but “guided” does not mean every missile uses the same seeker, control method or propulsion arrangement. For a broader example of that variation, the U.S. Air Force’s AGM-65 Maverick fact sheet describes a modular, larger tactical missile with electro-optical television, imaging-infrared and laser-guidance options. The Maverick is not a micro-missile; it illustrates that guidance approaches vary.

A documented miniature-missile example: NAVAIR’s Spike

Naval Air Warfare Center Weapons Division Public Affairs described Spike as a miniature missile in historical test releases. In 2006, NAVAIR reported dimensions of 25 inches long and 2.25 inches in diameter, with a weight of 5.3 pounds. Those figures are the specifications reported for Spike in that release; they do not establish a threshold for what counts as a micro-missile.

The same 2006 account said a Spike launched from 1,000 meters struck a two-meter target. This is a report of a particular test, not a general measure of miniature missiles’ accuracy or effectiveness. See NAVAIR’s 2006 Spike test account.

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In 2004, NAVAIR reported three controlled Spike test flights and said the missile demonstrated more than a dozen critical functions. The release described Spike as image-guided and “fire-and-forget,” terms that characterize the system as described in that historical account, not all small guided missiles. See the 2004 NAVAIR release.

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A 2007 NAVAIR account described a Spike demonstration against a moving target. Project manager Steve Felix called it “an absolutely perfect shot”; that quotation is his description of one test, not an independently established performance assessment. The account is available in NAVAIR’s 2007 moving-target report.

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How to interpret examples and claims

When comparing small guided-missile examples, keep separate the features that are often blurred together:

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  • Guidance approach: What seeker or guidance method does the source identify?
  • Launch and target environment: From where is the system launched, and what kind of target is it intended for?
  • Scale: What mass and dimensions does the source report, and for which system?
  • Evidence type: Is the source describing a test demonstration or an operational system?

These distinctions matter because a test result for one missile cannot establish typical performance for a broad, informally named category. NAVAIR’s Spike releases date from 2004, 2006 and 2007 and document demonstrations at those times. They do not establish Spike’s current production, deployment or program status.

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Quick Recap

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