How Heat Seeking Missile Works I Aim 9 Sidewinder

Explore how the AIM-9 Sidewinder heat-seeking missile works, its guidance system, history, and upgrades including the advanced A9X model.

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Key Takeaways

The AIM-9 Sidewinder is one of the most successful and cost-effective heat-seeking missiles with a long combat history.
Its guidance relies on infrared detection through a reticle seeker that converts heat signatures into tracking signals.
Upgrades like the A9X version enhance maneuverability, target recognition, and resistance to countermeasures.
The missile’s design balances mechanical and electronic systems for precise guidance and control.
Despite its age, the Sidewinder remains relevant due to continuous technological improvements.

What the video covers

The AIM-9 Sidewinder is a heat-seeking air-to-air missile using infrared optical guidance to track targets.
It features a reticle seeker with spinning lenses and mirrors to detect infrared signatures and convert them into signals.
The missile uses a solid fuel rocket motor and aerodynamic control fins guided by a gas servo assembly for maneuvering.
Historically, the Sidewinder achieved its first combat kill in 1958 during the Chinese Civil War and influenced Soviet missile development.
The missile’s guidance system includes an infrared seeker, electronic assembly, and gas servo assembly controlling the canards.
Older versions use rollerons for stability, while the A9X upgrade includes thrust vectoring and pivoting fins for improved performance.
The missile’s warhead is a 20 lb annular blast fragmentation type triggered by a proximity fuse.
Challenges include potential false targeting of heat sources like the sun or flares, addressed by newer infrared imaging seekers.
The A9X uses infrared cameras and algorithms to recognize and track aircraft shapes, improving target lock and flare resistance.
The video also compares the Sidewinder with other missile types and highlights its ongoing upgrades and operational significance.

How does the AIM-9 Sidewinder missile detect its target?

The AIM-9 Sidewinder uses an infrared seeker with a spinning reticle and lenses to detect the heat signature of a target aircraft, converting infrared light into signals that guide the missile.

What are the main differences between the older AIM-9 and the A9X version?

The A9X features thrust vectoring nozzles, pivoting fins for better maneuverability, and infrared imaging seekers with computer algorithms for improved target recognition and flare resistance, while retaining some legacy components.

What role do rollerons play in the AIM-9 Sidewinder missile?

Rollerons are small metal wheels on the missile’s tail that spin due to airflow, acting as gyroscopes to stabilize the missile during flight and maintain a steady trajectory.

Full Transcript — Download SRT & Markdown

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This is the heat-seeking missile, and inside this cover is the optical guidance system. The heat source from this aircraft travels through a set of lenses into the reticle, which spins on its axis. These infrared signatures are converted into audible tones like this.

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Sound. [Laughter] [Music] Here, all said and done, the pilot releases the missile, which uses a solid fuel rocket as the motor to chase the infrared heat source. The servo section controls the four canards to guide this A9 Sidewinder towards the

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target. We will also be looking at a super simplified process of how this infrared heat source hits this mirror, filtering the environmental light from the heat source. And not to forget the newer version, the A9X missile, it weighs in

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the process of tracking an enemy target, all in the video ahead. So stay tuned and don't miss a beat. The A9 is one of the oldest, least expensive, and most successful air-to-air missiles, with an estimated 270 kills worldwide to date.

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The first successful kill recorded in combat by a heat-seeking missile was an A9 Sidewinder on September 24, 1958. This occurred during the Chinese Civil War when a Taiwanese F-86 Saber shot down a communist Chinese MiG-15 using a B supplied by the US Navy. Another more

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interesting story during this conflict: one A9B struck a People's Liberation Army Air Force MiG-17 without detonating, enabling the pilot to safely bring the aircraft back to base. This missile was passed to Soviets, who examined it and were stunned by the

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innovative weapon system. The Soviets used this missile to reverse engineer their own copy of the Sidewinder, dubbed the Vympel K-13 or AA-2 NATO reporting name. This marked one of the first transfers of technology that took place during the Cold War

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era. The guidance and control section consists of the following three major assemblies: an infrared seeker assembly used for detecting the target, an electronic assembly used for converting detected target information into tracking and guidance command signals, and a gas servo assembly that

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includes a gas generator, manifold, pistons, rocker arms, electrical solenoids, and thermal battery. This assembly converts electrical guidance commands into the mechanical movement of the control fins. Four control fins are mounted on the guidance and control section to provide aerodynamic lift and course alterations

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to the missile during free flight. These movable surfaces are electrically controlled and pneumatic, operated by this gas servo assembly. This is the missile's umbilical cable, also attached to the guidance and control section. The umbilical cable provides the necessary path for the

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exchange of electronic signals and cooling gas between the missile and aircraft before missile launch. Let's dive further into the details regarding the heat-seeking missile and how it works. The front end of the missile is made out of a glass

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lens instead of a steel-shelled warhead. One of the most important devices is this reticle seeker, a common optical system design employed in conventional heat-seeking missiles. It consists of several basic parts to make this work: a primary mirror and IR

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detector, a reticle with plane, and a secondary mirror. The most simple form of reticle has two parts on it: one half transparent, the other half opaque, arranged in this form. This is how it works. The heat source travels through a set of lenses

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into the reticle, which spins on its axis, and the axis itself rotates in circles. An infrared light will blink at this point, marked as located here. This would trace out a path with respect to the reticle axis, generating a signal with

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varying phase and amplitude. If the jet switches direction to the left, the IR seeker will appear on the opaque part of the object. Let's dive further into this mechanism. A key component of the seeker head is a dichroic

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filter, which is used to isolate and pass through the required infrared wavelengths. The sensor would see the infrared source only during the transparent portions of the reticle, and so the output of the sensor will be a periodic pulse train of some frequency

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that is equal to the rate at which the reticle spins and times how many transparent spaces it has. The pulse will create an audible tone like this one if the missile is in its [Music] sight. On the contrary, the AA-3

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missile uses a pivoting seeker capable of rotating on each side, thus allowing for extreme lead pursuit flexibility and engagement of threats, but it requires a million-dollar radar to help track and aim this kill vehicle. The radar sends uplinks to update the new

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target position and estimated interception point. The kill vehicle adjusts its trajectory using highly dynamic thrust control while aligning its electro-optical sensors towards the target. As stated, this heat-seeking missile is being upgraded to the A9X for decades to come. As you can see, it looks

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a bit smaller compared to the older AM9 versions. When placed side by side, you can see that the back of the A9X has a thrust vectoring system, while the older version has a fixed nozzle. The A9X missile has fins that can pivot

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independently, whereas the older version has rollerons to maintain stability. However, it is important to note that the A9X incorporates many AM9 legacy components, including the rocket motor, warheads, and active optical target detectors. Despite this, its performance far exceeds that of the legacy Sidewinder. It has a solid propellant rocket motor with a length of 9.9 ft, which translates to around 3 m, and a launch weight of 186 lb or 84.3 kg. Its range and speed are still classified, but it is assumed to have a

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range of 35 km, translating to around 21 miles, with an astonishing speed of Mach 2.5. Let's take a simplified version of how this works. Step one: in this older version, the pilot needs to chase the target and can release the missile only

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after hearing the sound peak at a maximum, just like this audio. [Laughter] Here, this is generated by the reticle optical from the infrared heat signature generated by the enemy jet. Step two: the missile will initiate the solid rocket motor to launch towards its

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target. Step three: remember the rollerons on the tail, which are metal wheels with matches cut into them. As the missile speeds through the air, the wind current spins the rollerons like pinwheels. These rollerons on the rear wings help stabilize the

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missile in flight, acting as gyroscopes to counter the spinning forces. Step four: as stated, the servo pumps and pistons work their magic on the canards to compensate for the target's evasion from the center. Step five: the missile is designed

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to overcompensate for the movement to where the target is vectored instead of chasing the aircraft. As stated, the rollerons are designed to maintain a steady trajectory for the sensor, as shown in this animation. Step six: when it reaches the

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target, the proximity fuse triggers the 9.36 kg or 20 lb annular blast fragmentation warhead. This explosive force propels the metal fragments outward in all directions in an annular or ring-shaped pattern, destroying any aircraft when it is launched against

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it. However, sometimes it could lock onto the sun or another heat source instead of an enemy airplane, such as a plane deploying flares. Later on, the A9X began using infrared cameras to take pictures of where the seeker head is looking and

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again use computer algorithms to find their target. The difference is that IIR seekers can recognize the shape of an aircraft and compare it against a database, using that information to improve their ability to track the target. Once locked, it can avoid flares

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and hit its target. [Music] Successfully. Check out the Boeing B-52 bomber, the Bradley infantry fighting vehicle, and many more original videos just for you. So please hit the subscribe and like button.

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and hint its Target [Music] successfully check out the Boeing B52 bomber the Bradley infantry fighting vehicle and many more original videos just for you so please hit the Subscribe and like button

Topics:AIM-9 Sidewinderheat-seeking missileinfrared guidanceair-to-air missilemissile guidance systemA9X missilerolleronsthrust vectoringinfrared seekermissile technology

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