Radar & Defense

AARGM

Q: Does the AARGM use GPS?

Yes. The AARGM uses a tightly coupled GPS/INS navigation system for midcourse guidance. If GPS is jammed, the ring laser gyroscope INS maintains sufficient accuracy to deliver the missile into the terminal seeker acquisition basket. The INS drift rate is approximately 0.8 nmi/hr, sufficient for engagements under 100 nmi standoff range.

Q: What aircraft carry the AARGM?

The EA-18G Growler is the primary launch platform. F-16CJ Wild Weasel and Tornado ECR also integrate AARGM. The AARGM-ER (Extended Range) variant features a redesigned rocket motor and airframe allowing internal carriage in the F-35A/C weapon bays. AARGM-ER approximately doubles the standoff range compared to the baseline AGM-88E.

Q: Can AARGM hit a radar that has been turned off?

Yes. This is AARGM's primary advantage over the legacy HARM. If the emitter shuts down during the missile's midcourse phase, GPS/INS guides the missile to the last known coordinates. In the terminal phase, the active W-Band (94 GHz) mmWave seeker activates, providing sub-meter imaging resolution of the physical target vehicle. The seeker uses stored target templates to identify the radar transporter-erector-launcher (TEL) even when the antenna is stowed and the radar is silent.

/ay-ay-arr-jee-em/ (Advanced Anti-Radiation Guided Missile)

The AGM-88G AARGM is the US Navy's primary Suppression/Destruction of Enemy Air Defenses (SEAD/DEAD) weapon system, manufactured by Northrop Grumman. It combines a wideband passive RF seeker (covering 0.5-40 GHz) that homes on enemy radar emissions with an active W-Band (94 GHz) millimeter-wave terminal seeker for imaging identification of the physical target. GPS/INS provides midcourse guidance, enabling fire-and-forget engagement even when the target emitter shuts down. AARGM replaces the legacy AGM-88 HARM, adding the critical ability to destroy radar systems that attempt to evade by ceasing transmission.

Category: Radar & Defense

Designation: AGM-88E/G

Terminal Seeker: 94 GHz (W-Band)

Understanding the AARGM

Anti-radiation missiles have been a cornerstone of electronic warfare since the Vietnam-era AGM-45 Shrike. The concept is simple: home on the enemy's radar emissions and destroy the antenna. The critical weakness was always the "radar shutdown" countermeasure. If the enemy turned off the radar, legacy missiles like the HARM (AGM-88B) lost their homing signal and impacted the ground harmlessly. Modern integrated air defense systems (IADS) exploit this by cycling radars on and off rapidly.

AARGM solves this with a multi-mode guidance chain. The passive RF seeker provides initial detection and bearing during the launch and midcourse phases. If the emitter shuts down, GPS/INS maintains the trajectory to the last known coordinates. In the terminal phase, the 94 GHz mmWave radar activates, providing sub-meter resolution synthetic imaging of the target area. The onboard processor matches the radar return against stored target templates to identify and track the physical vehicle.

AARGM Guidance Chain

Phase 1 (Launch): Passive RF homing
Bearing accuracy: σ_θ ≈ λ/(2π·d·SNR^1/2)
Seeker bandwidth: 0.5-40 GHz (wideband)

Phase 2 (Midcourse): GPS/INS
INS drift: ~0.8 nmi/hr (ring laser gyroscope)
GPS accuracy: <3 m CEP (SAASM encrypted)

Phase 3 (Terminal): Active W-Band seeker
Frequency: 94 GHz (λ = 3.2 mm)
Range resolution: ΔR = c/(2B) ≈ 0.15 m (1 GHz BW)
Sub-meter imaging enables target ID even with radar off

AARGM vs Legacy HARM

Parameter	AGM-88B HARM	AGM-88E AARGM	AGM-88G AARGM-ER
Guidance	Passive RF only	Passive RF + GPS/INS + W-Band	Passive RF + GPS/INS + W-Band
Radar-off kill	No	Yes	Yes
Terminal seeker	None	94 GHz active	94 GHz active
Range	~80 nmi	~80 nmi	~150+ nmi
F-35 internal	No	No	Yes

Common Questions

Frequently Asked Questions

Does the AARGM use GPS?

Yes. The AARGM uses a tightly coupled GPS/INS system for midcourse guidance. If GPS is jammed, the ring laser gyroscope INS maintains sufficient accuracy (approximately 0.8 nmi/hr drift) to deliver the missile into the terminal seeker acquisition basket for engagements under 100 nmi standoff range.

What aircraft carry the AARGM?

The EA-18G Growler is the primary platform. F-16CJ Wild Weasel and Tornado ECR also integrate AARGM. The AARGM-ER variant features a redesigned airframe for internal carriage in F-35A/C weapon bays, approximately doubling standoff range compared to the baseline AGM-88E.

Can AARGM hit a radar that has been turned off?

Yes, this is AARGM's primary advantage over HARM. GPS/INS guides to the last known coordinates, then the 94 GHz terminal seeker activates, imaging the physical target vehicle with sub-meter resolution. The onboard processor matches against stored templates to identify the radar TEL even with the antenna stowed.

Related Terms

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