Category Archives: US Navy

Agile Beams: Active Electronically Scanned Array Radars

AESAs aim their "beam" by broadcasting radio energy that interfere constructively at certain angles in front of the antenna. They improve on the older passive electronically scanned radars by spreading their broadcasts out across a band of frequencies, which makes it very difficult to detect over background noise. AESAs allow ships and aircraft to broadcast powerful radar signals while still remaining stealthy. Above is AESA on F22

The AN/APG-77 is a multifunction radar installed on the F-22 Raptor fighter aircraft. It is one of the most advanced radar today. More than 100 APG-77 AESA radars have been produced to date by Northrop Grumman, and much of the technology developed for the APG-77 is being used in the APG-81 radar for the F-35 Lightning II. The APG-77v1 was installed on F-22 Raptors from Lot 5 and on. This provided full air-to-ground functionality (high-resolution synthetic aperture radar mapping, ground moving target indication and track (GMTI/GMTT), automatic cueing and recognition, combat identification, and many other advanced features).

APG-77 is based on Active Electronically Steered Array (AESA) technology. The AESA includes multiple individual active transmit/receive (T/R) elements within the antenna. Depending upon the precise implementation, there may be anywhere between 1000 and 2000 of these individual T/R elements which, together with the RF feed, comprise the AESA antenna. As for the passive ESA, these elements are highly redundant and the radar can continue to operate with a sizeable percentage of the devices inoperative. This graceful redundancy feature means that the radar antenna is extremely reliable; it has been claimed that an AESA antenna will outlast the host aircraft. The fact that the transmitter elements reside in the antenna itself means there is no standalone transmitter – there is an exciter but that is all. As before, there is clearly a need for a receiver as well as an RDP and signal processor. The active T/R elements are controlled in the same way as the phase shifters on the passive ESA, either by using a beam-steering computer (BSC) or by embedding the beam-steering function in the RDP.

The ability to control many individual T/R modules by software means confers the AESA with immense flexibility of which only a few examples are: First each radiating element may be controlled in terms of amplitude and phase, and this provides superior beam-shaping capabilities for advanced radar modes such as terrainfollowing, synthetic aperture radar (SAR) and inverse SAR (ISAR) modes. Secondly Multiple independently steered beams may be configured using partitioned parts of the multidevice array. Thirdly If suitable care is taken in the design of the T/R module, independent steerable beams operating on different frequencies may be accommodated and Finally The signal losses experienced by the individual T/R cell approach used in the AESA also bring considerable advantages in noise reduction, and this is reflected in improved radar performance.

The AN/APG-80 system is described as "agile beam", and can perform air-to-air, search-and-track, air-to-ground targeting and aircraft terrain-following functions simultaneously and for multiple targets. As a SAR system utilizing NG's fourth-generation transmitter/receiver technologies, it has a higher reliability and twice the range of older, mechanically-scanned AN/APG-68 radar systems. Above is F-16 APG-80 Radar

One dramatic improvement is the noise figure; it is especially significant achieving such an improvement so early in the RF front end. This results in a remarkable range improvement for the AESA radar. A number of US fighter aircraft are being fitted or retrofitted with AESA radars, these are F-22 Raptor, F-18E/F (Upgrade version) fitted with AN/APG-79, F-16E/F (Block 60) fitted with AN/APG-80, F-15 and F-35 fitted with AN/APG-81. Taking for example F-16, it is interesting to see a dofference in performance between two batches (Block 50) and Block 60. Former had target detection radar range of 50 miles, which was improved to 70 miles with AESA radards (for reference F-22 covers 125miles range). The F-16 Block 60 (now the F-16E/F) shows an improvement from 45 to 70 nm (þ55%), while the F-15C range has increased from 60 to 90 nm (þ50%). Apart from the obvious improvement in range, it has been stated by a highly authentic source that AESA radar confers 10–30 times more in radar operational capability compared with a conventional radar (Report of the Defense Science Board Task Force, 2001).

The F-16E (single seat) and F-16F (two seat) are newer F-16 variants. The Block 60 version is based on the F-16C/D Block 50/52 and has been developed especially for the United Arab Emirates (UAE). It features improved AN/APG-80 Active Electronically Scanned Array (AESA) radar, avionics, conformal fuel tanks (CFTs), and the more powerful GE F110-132 engine. However the batch bought by Pakistan Air Force (F-16C/D) is equipped with AN/APG-68 (V)9 Radar Systems. Only the Block 60 aircraft, destined for the UAE, are to be equipped with a more advanced version – the Active Electronically Scanned Array (AESA) radar. The APG-68(V)9 offers 30 percent increase in detection range, improved search-while-track mode (four vs. two tracked targets) and larger search volume and improved track while scan performance. Its single target track performance has also been improved. On air/ground missions, the new radar becomes an effective sensor, utilizing its high-resolution synthetic aperture radar mode, which allows the pilot to locate and recognize tactical ground targets from considerable distances. Although previous radars had some Synthetic Aperture Radar (SAR) capabilities, the new version generates imagery-class (2 feet resolution) high resolutions pictures, comparable to pictures delivered by the most modern commercial satellites. These pictures can be acquired from very long range, at all weather conditions and provide an effective, real-time source for the targeting of long range, precision guided weapons. The radar also has increased detection range in sea surveillance mode, and enhanced ground moving target identification and mappinc capability. The radar features an inertial measurement unit that improves dynamic tracking performance and provides an auto-boresight capability, which increases accuracy.

2 Comments

Filed under AESA, APG-68, APG-80, Electronic Warfare, F-16, F-22, F-22 raptor, F-35, F/A-18, Fifth Generation Combat Aircraft, Flight Simulation, FLIR Systems, Foreign Office Pakistan, Lockheed martin F-16, Pakistan, Pakistan Aeronautical Complex, Pakistan Air Force, Pakistan Air Force F16, Pakistan Air Force JF 17, Pakistan Chief of Army Staff, Pakistan Defence, Pakistan-Afghnistan Border, RADAR, Radars, Radio Frequency, Saudi Arabia, Saudi Aviation, Sixth Generation Fighter Jet, US Department of Defense, US Navy

Intellegent Warfare: Electronic Support Measures and Application of HARM Missile

USS KITTY HAWK (CV 63), At Sea (November 9, 2005) – Aviation Ordnanceman prepare to load a CATM-88 Harm missile onboard the USS Kitty Hawk (CV-63). While at sea, Kitty Hawk and Carrier Strike Group 5 will be participating in an annual exercise with the Japanese Maritime Self Defense Force. Currently underway in the western Pacific Ocean, Kitty Hawk Carrier Strike Group demonstrates power projection and sea control as the Navy's only permanently forward-deployed aircraft carrier strike group, operating from Yokosuka, Japan. U.S. Navy photo by Photographer’s Mate 3rd Class (AW) Jonathan Chandler.

After writing few posts discussing the technological influence on defence stratagies of different nation, this time I thought to go slightly technical. A reader may use this information as an extension of my discussion on Electronic Warfare – Electronic Warfare Operations Warfare has always been conducted by adversaries who have been at great pains to understand their enemy’s strengths and weaknesses in order to minimise the risk to their own forces and territory. The detection and interception of messages and the efforts to deceive the enemy have long been the task of the ‘secret service. As methods of communication developed, so too did methods of interception become more effective. Radar has developed from a mere detection mechanism to a means of surveillance and guidance. This post is focuses on gathering information on immediate threats which is performed by Electronic Support Measures (ECM)

MH-53 Pave Low helicopters prepare to take off for their final combat mission on Sept. 27, 2008, in Iraq. The MH-53, the largest and most technologically advanced helicopter in the Air Force with a record dating back to the Vietnam War, was retired from the Air Force inventory on Sept. 30, 2008

Electronic Warfare (EW) planning requires a broad understanding of enemy and friendly capabilities, tactics, and objectives. Employment of EW assets must be closely integrated into, and supportive of, the commander’s overall planning effort. This planning requires a multidisciplined approach with expertise from operations (ground, airborne, space), intelligence, logistics, weather, and information. Application of this sort of EW planning and employment was seen in Operation Desert Storm in 1991. three US Air Force MH-53J PAVE LOW helicopters (shown above) led nine US Army AH-64 Apache helicopters across the Saudi Arabia-Iraq border to attack two Iraqi early warning radar sites. Taking down these two sites opened the door for attacks across Iraq by F-117s, other coalition aircraft and Tomahawk missiles (shown below).

Block IV Cutaway - Raytheon

After the F-117s and cruise missiles came conventional aircraft. From 0355L to 0420L (H+55 to H+1:20) large numbers of USAF, USN, USMC, RSAF, and RAF aircraft smashed Iraqi air defenses and fields from H-3, an airfield located in western Iraq, to Ahmed Al Jaber, an airfield in occupied Kuwait. Two packages of aircraft, one a USN package from the Red Sea carriers and the other a USAF package from the south pointed directly at Baghdad. These “gorilla” packages were intended to seem threatening enough to force the Iraqis to hurl their air resources in defense. Air Force ground-launched BQM-34 and Navy tactical air-launched decoys (TALD) mimicked the radar return of conventional aircraft to further arouse Iraqi radar operators, many already confused by the absence of central control from Kari. Finally, radar-jamming aircraft radiated blanketing electronic emissions that drove the Iraqi radar operators to go to full power in an attempt to break through the interference. Then, the two incoming coalition flights revealed their true nature and pounced in a shrewd and devastating ruse.

The newest upgrade is a joint venture by the Italian Ministry of Defense and the US Department of Defense: the AGM-88E Advanced Anti Radiation Guided Missile (AARGM), produced by Alliant Techsystems.

What was unique here that, instead of bomb-carrying fighter-bombers, they were radar-killing electronic warriors carrying AGM-88 high-speed antiradiation missiles (HARMS) designed to home in on SAM and AAA radar (shown above). The AGM-88 High-speed Anti-Radiation Missile (HARM) is a tactical, air-to-surface missile designed to home in on electronic transmissions coming from surface-to-air radar systems. Originally developed by Texas Instruments (TI) as a replacement for the AGM-45 Shrike and AGM-78 Standard ARM system. Production was later taken over by Raytheon Corporation (RAYCO) when they purchased TI’s defense business. The AGM-88 can detect, attack and destroy a radar antenna or transmitter with minimal aircrew input. The proportional guidance system that homes in on enemy radar emissions has a fixed antenna and seeker head in the missile’s nose. A smokeless, solid-propellant, dual-thrust rocket motor propels the missile at speeds over Mach 2. HARM, a Navy-led program, was initially integrated onto the A-6E, A-7 and F/A-18 and later onto the EA-6B. USAF F-4G Wild Weasels alone expended dozens of HARMS in twenty minutes, while USN/USMC F/A-18s fired one hundred for the night. HARMS filled the air over Baghdad, the site of over one-half of Iraq’s SAM and AAA batteries. Foolishly, the Iraqis did not turn off their radars, even when the HARMS fireballed in their midst; as one USAF flight leader averred, ‘the emitters came on and stayed on for the entire flight of the missiles.’ This deadly surprise not only destroyed many Iraqi radars, it also terrified their operators. For the rest of the war, they showed great reluctance to use radar and often chose to launch their SAMs with optical or even no guidance.

High-speed Anti-Radiation Missile (HARM) – A Little Overview

The initial HARM attack and the F-117 bombings of the Kari system left Iraq’s integrated air defense system shattered, opening up the country so completely that, within days, coalition air-to-air tankers regularly operated in Iraqi airspace. Other non-stealthy aircraft pummeled Iraqi airfields. An anti-radiation missile (ARM) is a missile which is designed to detect and home in on an enemy radio emission source. Typically these are designed for use against an enemy radar, although jammers and even radios used for communication can also be targeted in this manner. This sort of weapons are key to EW inventory. The word “Radiation” here refers to Electromegnetic radiation, not nuclear. The missile is the direct descendant of the Shrike and Standard ARM missiles used in Vietnam. Most ARM designs to date have been intended for use against ground-based radars. Commonly carried by specialist aircraft in the SEAD (Suppression of Enemy Air Defense) role (known to the USAF as “Wild Weasels”), the primary purpose of this type of missile is to degrade enemy air defenses in the first period of a conflict in order to increase the chances of survival for the following waves of strike aircraft. They can also be used to quickly shut down unexpected SAM sites during a raid. Aircraft which fly with strike aircraft to protect them from enemy air defences often also carry cluster bombs and are known as a SEAD escort. The cluster bombs can be used to ensure that after the ARM disables the SAM system’s radar, the command post, missile launchers, and other components or equipment are also destroyed to guarantee the SAM site stays down.

The R-27 is manufactured in infrared-homing (R-27T), semi-active-radar-homing (R-27R), and active-radar-homing (R-27AE) versions, in both Russia and the Ukraine. The R-27 missile is carried by the Mikoyan MiG-29 and Sukhoi Su-27 fighters, and some of the later-model MiG-23MLD fighters have also been adapted to carry it.

The above account of the First Night of Operation Desert Storm was taken from the Decisive Force: Strategic Bombing in the Gulf War by Richard G. Davis. More recently, air-to-air ARM designs have begun to appear, notably the Russian Vympel R-27P. Such missiles have several advantages over other missile guidance techniques; they do not trigger radar warning receivers (conferring a measure of surprise), and they can have a longer range (since battery life of the seeker head is the limiting factor on the range of most active radar homing systems).

Electronic Support Measures

Technically ESM consists of a collection of senstive antennas designed to detect signals in different frequency bands. Often these antennas are grouped at aircraft’s wing tip pod, which allows a wide angle view without causing too much obstruction as well as to enable a fix on the signal source to obtain an accurate Dircection of Arrival (DoA) of the signal. An effective ESM system rapidly identifies the signal band and location, and determines the signal characteristics. A signal analyser then examines the signal characteristics to identify the type of transmitter and the level of threat posed. Even the most cursory of analysis can establish whether the emitter is associated with surveillance, target tracking or target engagement. This analysis can compare the signal with known emitter characteristics obtained from an intelligence database or threat library and known signal types confirmed and new emissions identified and categorised. Every signal identification is logged with date, time and intercept coordinates, along with the known or suspected platform type, and the results are stored.

ESm Pods on Nimrod: As well as providing threat information, ESM is used by maritime and battlefield surveillance aircraft as a passive or listening sensor which adds important information to other sensors. It is especially useful when tracking submarines

Signals received by the electronic support measures system may in some cases be analysed instantaneously to produce an identity for the transmitter of each signal received. Pulse width, Pulse amplitude and carrier frequency are few important parameters. The nature of the pulse shape is used to determine the particular type of transmitter. The scan rate and the pattern of the scan also provide invaluable information about the mode of the transmitter. It is possible to detect the antennas changing from scanning mode to lock-on to tracking and hence determine the threat that the transmitting station poses. As well as providing threat information, ESM is used by maritime and battlefield surveillance aircraft as a passive or listening sensor which adds important information to other sensors.

The salient signal characteristics or discriminators identified during the ESM collection and identification process includes: Signal Frequency (this is to detect the radar type), Blip/Scan ratio (to get the estimate for scan rate, sector scan width and radar bandwidth), Scan Rate, Scan Pattern (Search, track, track-while-scan (TWS) and ground-mapping (GM) modes will exhibit particular characteristics), Signal Modulation (Pulse, pulse compression, pulsed Doppler (PD), a continuous wave (CW) and other more sophisticated forms of modulation are indicative of the emitter mode(s) of operation and likely threat level) and finally Pulse Repetition Frequency (PRF).

Technical details as well as the schemetic of the ESM system can found in any dedicated military systems book, however, those who are Interested to explore more, I will strongly recommend Military Avionics Systems by Ion Mior and Allen Seabridge.

The combination of analysis of all these modes of operation and when they are employed either singly or in combination is vital to establishing the likely capabilities and intentions of a threat platform, especially when used in combination with other intelligence information. Electronic Support Measures may be employed at a strategic intelligence-gathering level using an AWACS (airborne early warning and command system) or MPA aircraft to build the overall intelligence picture and electronic order of battle (EOB). Alternatively, such information may be gathered and utilised at a tactical level using radar warning receivers (RWR), whereby information is gathered and used at the strike platform level to enable strike aircraft to avoid the most heavily defended enemy complexes during the mission.

As I mentioned earlier, this (ESM) is one element of Electronic Warfare. This is because the nature of EW warfare and devices used. The operating frequency ranges for radars are usually very broad, and no single system can cover the whole range for transmission or reception. Hence, most communications and radar systems are designed for use in specific bands. These bands are usually designated by international convention. The main role of electronic warfare is to search these radio-frequency bands in order to gather information that can be used by intelligence analysts or by front-line operators. The information gained may be put to immediate effect to gain a tactical advantage on the battlefield; it may be used to picture the strategic scenario in peace time, in transition to war, or during a conflict. It may also be used to devise countermeasures to avoid a direct threat or to deny communications to an enemy. It must also be observed that such tactics are deployed by all sides in a conflict – in other words, the listeners are themselves being listened to.

1 Comment

Filed under AAR Corporation, AARGM, Afghanistan, AGm-113 Hellfire, AGM-154 JSOW, Agusta Westland, Air Defence, Anti-Radiation Missiles, ASN Technology, ASN-229A UAV, Asymmetric Weapons, AWACS, Black Hawk, BQm-34, CIA, Cold War, Direct Energy Warfare, Direct Energy Weapons, Electromagnectic Pulses, Electromagnetic Spectrum, F-117, F/A-18, HARM, Lockheed Martin, Lockheed martin F-16, MH-53, MH-53 Pave, NATO, Navy tactical air-launched decoys, Northrop-Grumman, Operation Desert Storm, People Liberation Army, R-27, RAF Nimrod, RSAF, S-400 missiles, Sea King, SEAD, Sukhoi, Sukhoi PAK-FA, Sukhoi Su-33, surface-to-air missile, TALD, Tommahawk missiles, U.S Marines, US Department of Defense, US Navy, USMC, USS Kitty Hawk, Vietnam War, Wild Weasels

Defence Market Speculation: Boom and Bust in Aerospace Industry

Following piece is written by Rick Whittington, taken from Aerospace And Defense Picks For 2011 (17-12-10). Recently both UK and USA defence budgets were revised with further revision in defence policies. Recent retirement of RAF’s Harrier, and delays in F-35 has created a big gap within RAF inventory. Not only that Both BAe Systems and Rolls Royce has seen declines after recent Qanatas Incident. From civilian market, Seattle Time cites that as Boeing prepares to announce yet another delay for the 787 Dreamliner — at least three months, possibly six or more — the crucial jet program is in even worse shape than it appears. A top Federal Aviation Administration (FAA) official 10 days ago warned Boeing that without further proof of the plane’s reliability, it won’t be certified to fly the long intercontinental routes that airlines expect it to serve. Since then share prices are on continuous decline for Boeing. Among the 787’s lesser ongoing problems is “rain in the plane,” the term used for heavy condensation dripping inside the jet’s composite plastic fuselage. Yet that issue is piddling compared with the major flaws that have brought a wave of successive delays. Earlier this month, John Hickey, the FAA’s deputy associate administrator for aviation safety, visited Seattle and warned 787 executives that in the current state of the program, the jet cannot be certified for long-distance transocean and transpolar flights, according to a person familiar with the details. More on B787 can be found HERE

A fiscally focused trend in U.S. politics means defense spending may drop in 2011. Which aerospace companies will bust and which will boom regardless? Secular change in the U.S. political landscape augurs poorly for defense fundamentals, with fiscal rectitude offsetting China’s brusque ascent on the world scene–an ascent that would otherwise dictate modernization to offset an increasingly sophisticated major power. Following a near decade of above-trend reports, earnings of military suppliers are set for several difficult years, as hard-won margin gains in the Bush years reverse, revenues reduce and backlogs diminish. Just how far the decline will carry remains largely out of public view, as long-range budget details are classified, but Washington circles are already abuzz with steep funding drops in weapons modernization and force structure.

The company's original internal target for its own development costs was $5 billion. But with yet another delay, several Wall Street analysts estimate that fixing the litany of manufacturing problems, plus paying penalties to suppliers and airlines, has piled on an additional $12 billion to $18 billion.

Ongoing budget review, which in Washington goes on all year, is already producing shock waves in contractor circles as word leaks out of the bad news ahead. Actually, many had figured out the deteriorating trend two years ago when a new administration was swept into power, but most held their breath hoping the worst case wouldn’t develop. Unfortunate for the bull case, however, the Republican tidal wave this past election is distinctly tinged with fiscal austerity, with national security taking a back seat. The deleterious impact on defense contractors has finally begun trickling into Wall Street views and the stocks are rolling over.

Pure-play suppliers that have most benefited from the longest conflict in American history–the Revolution’s eight-year employment of Washington’s Continentals has been surpassed by forces in the field in Iraq and Afghanistan–are highly vulnerable to the downsizing that lies ahead. The likes of Lockheed, Northrop-Grumman, Raytheon ( RTN – news – people ), L-3 and General Dynamics ( GD – news – people ) face big funding cuts that seriously compromise earnings integrity and could even create black holes necessitating serious corporate restructuring. Past periods like this have seen steep valuation discounts for the pure-plays.

On the other hand, commercial aviation and industrial infrastructure companies continue to guide up as the business cycle recovery of nearly two years ago gains steam. U.S. business confidence began improving as Congress promised to change hands, meaning additional unfriendly legislation was averted and commerce-centric policies were brought to center stage. Tax cuts will now be followed up with fiscal restraint, incenting hiring and fixed investment projects. Until money measurably tightens, a virtuous cycle encompassing developed world capital goods exporters and consumers will continue to fuel aggregate demand and push earnings higher.

Many think the best plays are in emerging markets, as their growth is much stronger than in far larger, developed economies. Our view, however, turns this consensus perspective on its head, seeing domestic U.S. equities as the preferred plays where they derive principal impetus from global growth. Our favorites include a host of commercial aviation and industrial suppliers that benefit from rising trade flows, demand for aircraft passenger travel and freight. Multi-industry aerospace and industrial companies bring the best of both worlds.

Delay-plagued Boeing ( BA – news – people ) will eventually right the 787 and surmount prior decade outsourcing and partnering decisions that have severely hampered program efficacy. As investors await word on when flight tests will resume and the extent to which deliveries are rescheduled, good news from other quarters is helping offset the latest disappointments. Increased production of other airliner models enjoying strong margins, notably the 777 but also 737 and a re-engineered 747, as well as price hikes combine with ongoing reports of airline profitability and upgraded air traffic forecasts.

Then, there’s also some good news unique to Boeing on the defense front. Overseas sales of fighter aircraft and helicopters to Saudi Arabia and possibly India combine with potentially quite consequential F-35 delays and new generation satellites for both government and commercial customers. As the Chinese build increasingly advanced twin-engine fighters, the U.S. and its Asian allies must confront single-engine, multi-mission F-35s without commensurate aerial superiority. With the F-22 now cancelled and its production base dismantled, there’s no ready response other than more Boeing F-18s. The Navy is already getting extras and we’d guess others will line up behind.

Tag along suppliers to Boeing and Airbus, as well as a handful of business and regional jet makers, include predominantly civil aviation oriented Goodrich ( GR – news – people ), BE Aerospace ( BEAV – news – people ) and Spirit AeroSystems. Spanning a broad gamut of advanced capital goods and industrial materials are diversified suppliers Precision Castparts ( PCP – news – people ), United Technologies ( UTX – news – people ), Honeywell ( HON – news – people ), Eaton and Parker-Hannifin, each a proxy for global infrastructure growth. United Tech and Honeywell just issued bullish 2011 initial views that will likely see upsides as the New Year rolls out.

Then there are companies with greater military exposure, such as electro-mechanical automation supplier Moog, advanced composites supplier Hexcel ( HXL – news – people ) and electronics-denominated navigation, communications and avionics specialist Rockwell-Collins. Each of these should see non-defense segments outweigh prospective cuts in military spending. Other mixed suppliers straddling the two worlds that will have a more difficult time in the years ahead include Esterline, FLIR Systems ( FLIR – news – people ) and AAR Corporation ( AIR – news – people ). These shares could face growing headwinds, especially as U.S. troops begin to draw down in Afghanistan.

Leave a comment

Filed under AAR Corporation, Aerobatics, Afghanistan, Africa, Air Defence, Airbus A310-300, Aviation, Bae Systems, Barak Obama, Boeing, Boeing 737 next generation, Boeing 787, F-35, FLIR Systems, General Dynamics, Goodrich, Moog, Northrop-Grumman, Qantas, Saudi Arab, Seattle Times, Spirit AeroSystems, US Navy