Joint Helmet-Mounted Cueing System

choi

(1) helmet-mounted display
https://en.wikipedia.org/wiki/Helmet-mounted_display
(section 4        Major systems, section 4.4 Joint Helmet-Mounted Cueing System (JHMCS): "JHMCS is a derivative of the DASH III [manufactured by Israel's Elbit] and the Kaiser Agile Eye HMDs * * *  In March 2009, a successfully 'Lock on After Launch' firing of an ASRAAM at a target located behind the wing-line of the 'shooter' aircraft, was demonstrated by a Royal Australian Air Force (RAAF) F/A-18 using JHMCS")

Quote: "HMD systems, combined with High Off-Boresight (HOBS) weapons, results in the ability for aircrew to attack and destroy nearly any target seen by the pilot. These systems allow targets to be designated with minimal aircraft maneuvering, minimizing the time spent in the threat environment, and allowing greater lethality, survivability, and pilot situational awareness.

You Should not dwell on this sub-section in the Wiki page. March forward.

(2) Historical Snapshot. Boeing, undated (under the heading Joint Helmet-Mounted Cueing System)
http://www.boeing.com/history/pr ... -cueing-system.page

Quote: "The high off-boresight seeker (HOBS) system consists of the JHMCS and the AIM-9X high off-boresight air-to-air missile. The AIM-9X is an advanced short-range dogfight weapon that can intercept airborne targets located at high off-boresight lines of sight relative to the shooter. The combination of JHMCS and AIM-9X results in a weapon that can attack and destroy an airborne enemy seen by the pilot. This weapon can be employed without maneuvering the aircraft, minimizing the time spent in the threat environment.

Note: Whether lock-on after or before launch, the distinguishing feature is "without maneuvering the aircraft" to aim at or near the target.

(3) But What is HOBS?
(a) air-to-air missile
https://en.wikipedia.org/wiki/Air-to-air_missile

Quote: "section 3.2 Infrared guidance[:] * * * Start of the 21st century missiles such as the ASRAAM use an 'imaging infrared' seeker which 'sees' the target (much like a digital video camera), and can distinguish between an aircraft and a point heat source such as a flare. They also feature a very wide detection angle, so the attacking aircraft does not have to be pointing straight at the target for the missile to lock on. The pilot can use a helmet mounted sight (HMS) and target another aircraft by looking at it, and then firing. This is called 'off-boresight' launch. For example, the Russian Su-27 is equipped with an infra-red search and track (IRST) system with laser rangefinder for its HMS-aimed missiles.

(b)
(i) boresight (firearm)
https://en.wikipedia.org/wiki/Boresight_(firearm)
(to align the firearm barrel and sights)

Quote: "Traditional boresighting, as the name suggests, involves removing the bolt and sighting down the bore of a gun to a fixed point. While the rifle is fixed in place, the scope or irons can then be adjusted to also aim at the distant object. A more modern method of boresighting is to use a laser rather than by visual inspection to illuminate the distant point. This method is preferable because it allows more movement in the gun, as the laser dot will not move relative to the barrel, and is a method of boresighting which does not require the removal of the bolt.

(ii) boresight (vt):
"1:  to bring into proper parallel alignment (the bore and sights of a gun) by sighting on a distant point through the bore and adjusting the sights on that same point
2a :  to aim at (a target) by sighting through the bore
b :  to aim at (a target) very accurately
www.merriam-webster.com/dictionary/boresight
(A) This definition is in advanced version of the dictionary, not usually available to the public. So, if you click the link, you may not reach the page unless you opt for a 14-day risk-free trial, for example.
(B) Again, in definition 1, note "through the bore," which is exactly what the Wiki page says.

(4) Finally, the "high" in HOBS means high off-boresight angle --wide off the (bore)sight.