Gain describe how narrow a radar beam is
Radar Basic

I don’t see where he takes into account that it is a beam. There should be another parameter in the equation for the narrowness of the beam. ( instead of 4pi^2 I think )

Didn’t Boeing made a HPM weapons that can be carried by JASSM airframe?
http://mil-embedded.com/news/raytheon-emp-missile-tested-by-boeing-usaf-research-lab/

On the AGM-86.

No. The EA Mode in both radars are basically jamming, probably deception one. Not HPM.

The answer is no.

For range however you can make basic calculations based on power density. to determine how much power received by target at range. You can look at Filippo Neri’s “Introduction to Electronic Defense” 2nd Edition. for the calculation method.

I am not so sure about that, check this article that was originaly on defensenews.com:

Posted 05/30/05 15:24
By MICHAEL FABEY
DefenseNews.com

The radar mounted on the F/A-22 Raptor and F-35 Joint Strike Fighter (JSF) can be used to fry electronic parts of ground-based radars and disable airborne cruise missiles, program officials for the planes acknowledge.

U.S. Air Force officials and contractors have longed bragged about the active electronically scanned array (AESA) radar, citing its ability to track multiple targets, map terrain and protect planes from attack. And there have been hints of offensive capability, like a brief mention of “high power electronic attack” on one of the JSF’s glossy marketing brochures.

But contractors say they have not publicly talked about the capability — until now.

“It could cause actual physical damage to a system … providing it’s on the X-band,” a common frequency for military radars, said Wayne Wilson, the director of fighter business development for Northrop Grumman Electronic Systems.

The radars — the AN/APG-77 for the Raptor and the more advanced AN/APG-81 intended for the JSF — emit electromagnetic emissions that could be used to damage or disrupt guidance components in cruise missiles, Wilson said. Other sources said the radar also can help deflect air-to-air missiles.

It’s been a given that pilots could use the radar to track the missiles, or other aircraft, in order to attack them with their own air-to-air weapons. But, military analysts say, it’s the offensive possibilities that make the sensor-turned-weapon a much more powerful tool.

They say the Air Force could fly a “wall” of Raptors or JSFs through an area to knock out enemy radars, sweeping a battle zone clean of many threats to aircraft and ground forces.

The revelation comes as Air Force officials work to convince Pentagon officials to allow them to buy more of the stealthy, supersonic Raptors. Service officials want more than 400 of the jets, but Pentagon officials decided to cap the program at about 180.

AESA Advance

Mounted in an aircraft’s nose, the AESA radar is an active array of more than 1,000 modules, each with its own transmitter and receiver, phase shifter and amplifier. It’s almost like having a thousand small radars in one honeycombed dome.

Onboard computers can delegate the modules to perform separate tasks, so that the radar can simultaneously track enemy aircraft, search for more, and check out the ground ahead. In the Raptor, the modules are arranged in three groups — one pointing forward, one to the left and one to the right — giving the pilot a wide field of vision.

Northrop’s AESA radar was originally designed for the Raptor, then tweaked for the JSF. Now company engineers have created a new version of the Raptor’s AN/APG-77 by adapting design elements of the JSF’s AN/APG-81 and the AN/APG-80, which flies aboard Lockheed Martin F-16 Block 60 fighters. The new variant is intended to cost less to produce and maintain.

“We’re taking the improvements we’re making on the Joint Strike Fighter and pushing them back on the Raptor,” Wilson said.

Northrop Grumman produces the Raptor’s radar under contract to Boeing’s Integrated Defense Systems unit, which is integrating the avionics for the F/A-22 program, led by Lockheed Martin Aeronautics. Raytheon Systems of McKinney, Texas, is a joint-venture partner on the radar.

The JSF radar passed a key milestone May 23 by detecting airborne targets at a Northrop Grumman laboratory. Two days later, Northrop Grumman delivered a new AESA radar version for the Raptor to give the plane better air-to-ground combat capability.

The way the Raptor’s radar antenna is integrated physically and electromagnetically with the airframe helps provide a much larger transmission bandwidth for the radar, using less power, according to GlobalSecurity.org, a defense consultancy.

The book “Advanced Tactical Fighter to F-22 Raptor: Origins of the 21st Century Air Dominance Fighter” called the radar improvements “dramatic,” especially in areas of performance, reliability and versatility. Written by a trio of authors including Albert Piccirillo, the Air Force’s advanced tactical fighter program manager from 1983 to 1987, the book said the active array capability would “undoubtedly lead to a variety of novel operations and quantum enhancements in electronic countermeasures.”

There are other planes that use phased array radar — which use multiple electronically controlled beams and frequencies — but they have one transmitter and receiver for the whole radar.

A different AESA radar will fly aboard the newest batches of the U.S. Navy’s F/A-18E/F Super Hornet fighters, which are being fitted with the AN/APG-79 developed by Raytheon Space and Airborne Systems, El Segundo, Calif. •

The radar emits a narrow beam, and the closer the Aircraft is to the target the more EM power it will receive.