Military drones continue to take flight
Drones are becoming ever more important in frontline conflict. Here we look at the many ways in which these complex machines have infiltrated the combat arena.
The role of the aircraft in modern military actions is altering, and at a dramatic rate. Traditionally, the air force would provide the backbone of any military air campaign – both from a reconnaissance standpoint and for strike operations, but recent conflicts in Iraq and Afghanistan have highlighted the growing use of Unmanned Aerial Vehicles (UAV). This new approach is driven by a variety of factors including operational requirements, costs and pilot safety. And without a doubt it is a lucrative market with the industry estimated to be worth £5bn this year.
The military market for UAVs is growing year on year. At the turn of the century there were just a small handful of UAVs in the US military inventory. Now, ten years later, there are several hundred of the larger variety – Predator and Reaper – with the US Army operating thousands of smaller tactical and hand-launched systems.
According to General Atomics Aeronautical Systems, the demand for its Predator and Gray Eagle-series continues to increase exponentially on a yearly basis. 'In 2006, our family accumulated 80,000 flight hours,' Kimberly A Kasitz, General Atomics Aeronautical Systems, says. 'In 2010, that number surged to 375,000 flight hours.'
UAVs proved their worth in the recent conflict in Libya and even hit the headlines in June when the first NATO casualty in the engagement was a Northrop Grumman MQ-8 Fire Scout, shot down by Gaddafi's forces.
The US is not alone in its use of UAVs. Israel has its own Heron TP UAV while China has the Silver Eagle. 'Even in the UK we have seen the demise of obsolete artillery-spotting Phoenix UAVs and the inception of the Watchkeeper, a larger and infinitely more capable system to provide Intelligence Collection capabilities for the British Army as a whole,' Mike Humphreys, head of requirements integration and campaign support within the military air and information branch of BAE Systems, says.
The benefits of UAVs are readily apparent. They are relatively cheap to acquire, operate and maintain when compared to a fast jet or larger intelligence acquisition systems. 'This is not to say that they are more capable across the military operational domain, but rather that in current, insurgency-based operations, these advantages, coupled with very long endurance by comparison to jet-powered and manned platforms, make them ideal platforms to deliver decisive military effect against these difficult, fleeting targets,' Humphreys adds.
As the technology associated with UAVs develops, their role is changing. Initial platforms were mere carriers for full-motion-video sensors, but they have been weaponised, carry more sensors and integrate effectively with the battle space.
It is not just the role that is changing for these systems. The nomenclature 'UAV' has evolved to 'UAS' – Unmanned Aircraft Systems. UAS denotes a 'system of systems' whereby the air vehicle is equipped with multiple payloads, or systems, to satisfy a variety of mission sets. 'UAVs have gone from being at the cheap, cheerful and thus arguably the disposable end of the military air platform range, to altogether more capable, complex and costly,' Humphreys explains. 'The advent of Remote Site Operations has also seen the advent of crews living in Las Vegas, but fighting the air war over Iraq. Platforms have become bigger, faster and weaponised.
'The man-in-the-cockpit still presents a certain military capability required in high-intensity or short-notice events, but for most other applications the UAV is now a cost-effective means to deliver capability in enduring conflicts.'
The mainstay of the US military is General Atomics' Predator series. The system first entered service over 15 years ago, but is still the pillar for many military operations. 'Predator routinely performed line-of-sight missions, and later it incorporated satellite communications, allowing it to perform beyond-line-of-sight missions,' Kasitz says. 'During its first few years in operation Predator was viewed strictly as an Intelligence, Surveillance and Reconnaissance (ISR) asset. Later, in 1999, it began laser designating for other attack aircraft. In 2001, its mission evolved again, tasked with weapons release.'
There are two recognised control systems for UAVs – line-of-sight and beyond line-of-sight. Line-of-sight command links effectively link the ground controller direct to his platform like a model aircraft, albeit the datalink systems are far more complex and digital.
'Digital datalinks maintain the link between ground operator and aircraft, either by direct line-of-sight, or at greater ranges using satellite systems,' Humphreys adds. 'When the link is broken, which does happen, albeit temporarily, in most cases and even then only for very short, sub-one-second periods, the platform is programmed to complete a series of automatic actions to re-establish the link or, failing that, to return to base and land.'
Larger UAVs now operate beyond-line-of-sight, with operators controlling platforms through satellite links from several thousand miles away. 'Clearly this confers some lag in the system, which for the current crop of platforms, many of which are 'flown' with conventional controls such as joysticks, can be an issue,' Humphreys says. 'These remotely piloted air systems do, however, integrate effectively into modern air management systems. More modern approaches replace the pilot with operators and computer interfaces, which replicate the Human-machine interfaces of computer games. We may expect this to change again, to direct voice command and other forms of intuitive control where the operator instructs the air vehicle to undertake a task, rather than guiding the platform directly.'
General Atomics report that customer demand for sensors, particularly the Lynx Multi-mode Radar, continues to grow. 'Lynx is a long-range, wide-area surveillance sensor that is particularly valuable to our customers for detecting time-sensitive targets and moving vehicles,' Kasitz says. 'It features photographic-quality resolution and delivers an all-weather capability.
'Customers are also interested in high-definition [HD] video. Our current video compression squeezes 560 x 480 pixel resolution images into 3.2MBps at 30 frames per second. The new HD compressor will produce greater resolution images (1280 x 720 pixels), increasing data to 6.4MBps.'
Humphreys agrees that more and better sensors, both from a fidelity perspective and also field-of-view terms are driving innovation. 'As far as the actual UAV system goes, autonomy is increasingly in vogue, both to analyse the huge amounts of data, and to reduce the training requirement and skill sets required of the crews,' he adds.
One challenge that may hinder the use of UAVs is access to airspace as they lack effective sense-and-avoid technologies. 'Currently, access is limited to segregated airspace over sea or in military ranges,' Humphreys says. 'Access to airspace will see an exponential rise in the number of civil applications for which UAVs are used. However, with this rise the available bandwidth over which UAVs may be controlled or pass their data will be increasingly constrained.
'The policies and processes which regulate the use of the EM spectrum will need rapid and imaginative revamp to enable the market to gather pace in a controlled fashion, and the use of compression technologies to limit the need for bandwidth will increase in step with the market.'
In the short term there is expected to be gradual innovation in UAVs that will optimise their current generation and style. However, the next generation of vehicles will be far more autonomous and many experts predict that in 20 years they will run their own missions with minimal interaction with human controllers, and only defer to them for a human decision driven by regulation, law or ethical considerations. 'Platforms will emerge to capture the advantages of long-persistence or high-altitude operations – lighter-than-air – and in so doing some functions currently undertaken by satellites might well move onto cheaper, high-flying UAVs,' Humphrey concludes.
UAVs around the globe
RQ-5 Hunter Payload: 90kg Speed: 127mph Altitude: 15,000ft Range: 144 miles
RQ-4 Global Hawk Payload: 1,360kg Speed: 497mph Altitude: 65,000ft Range: 15,525mi
MQ-Reaper Payload: 1,700kg Speed: 300mph Altitude: 50,000ft Range: 3,682 miles
Predator Payload: 340kg Speed: 135mph Altitude: 25,000ft Range: 675 miles
Herti Payload: 150kg Speed: 136mph Altitude: 25,000ft Range: 18 hours
MQ-8 Firescout Payload: 272kg Speed: 132mph Altitude: 20,000ft Range: 8 hours
Hermes 450 Payload: 150kg Speed: 109mph Altitude: 18,000ft Range: 124 miles
Raven Payload: 0.2kg Speed: 51mph Altitude: 14,000ft Range: 6.2 miles
Orbitor Payload: 1.5kg Speed: 80mph Altitude: 18,000ft Range: 4 hours
UK Thermal imagery technology onboard a tiny UAV used to combat anti-social behaviour led to the arrest of two car thieves in Liverpool last year. Unfortunately, Merseyside Police were forced to shelve the UAV when it emerged they'd not obtained a permit from the Civil Aviation Authority.
Balkans UAVs were used by NATO in Kosovo for surveillance and bomb damage assessment purposes. Hunter and Predator UAVs allowed NATO to find targets without exposing pilots to hostile fire. Much of the sensory technology and tactics today is influenced by early operations in the Balkans.
Iraq UAVs radically changed modern warfare with cheap, compact designs such as Raven. Use of UAVs during the War in Iraq increased from 200 to 6,000 in six years. Iraq saw the first dogfight between a manned MiG and an unmanned Predator, with the UAV being shot down.
Pakistan The US has been using the armed MQ-1 Predator and the MQ-9 Reaper on Pakistan since 2004 as part of their War on Terrorism. UAVs have been used to fire missiles on Taliban and al-Qaeda militant targets, but the 'drone war' has been criticised for the large numbers of civilian deaths.
Afghanistan Use of UAVs increased in 2001 following 9/11 attacks. The UK had three Reapers in Afghanistan and a rumoured 450 Hermes rented from Israel. Despite heavy civilian casualties, UK Prime Minister David Cameron claims 124 Afghan militants were killed in attacks.
Libya Armed and surveillance UAVs have been deployed over Libya since the start of Libyan-revolutionary Muhammad al-Gaddafi's reign of terror. Earlier this year, a NATO-controlled MQ-8B Fire Scout crashed over Libyian coast after losing control with its central commander.
Mexico Mexican UAVs are famous for their wayward crashes into civilian property: a Mexican Orbitor was found in an El Paso backyard last year. South America are using UAVs for drug-related surveillance on the Mexico border.
Brazil Four drones are to survey the border connecting Brazil, Bolivia and Peru by the end of August 2011 in an anti-drugs effort. The UAVs will be used to monitor private aircrafts entering Bolivian airspace in order to determine whether they are involved in drug-related crime.
Yemen Last year the US deployed an unarmed Predator UAV in Yemen to hunt al-Qaeda militants suspected to be hiding in the region. Until now the UAVs have been predominantly unarmed, but missile attacks on the country have taken place in obscurer areas of the country.
Somalia Surveillance UAVs have been used since 2009 to patrol the Indian Ocean to stamp down on Pirate-related crimes. MQ-9 Reapers are used to detect suspicious vessels, which are then alerted to the Naval authorities. Armed UAVs have also been used in attacks on Islamic militants.
India Surveillance UAVs were used in Chandigarh during Chief Minister and Bahujan Samaj Party leader Mayawati's rally this year. The Netra and Golden Hawk were India's first UAV venture. Unfortunately, the onboard cameras were unable to focus on individual faces rendering them useless.
Vietnam One of the first jet-propelled UAVs ever used, Ryan Firebees were used in reconnaissance stealth missions by the Navy during the War in Vietnam. The Firebee I is the longest serving UAV still in use today and will reach its 50th birthday this year.
|To start a discussion topic about this article, please log in or register.|
"Are you a digital native or an analogue native? The analogue aesthetic is alive and well at work in art, music, fashion and many other aspects of culture"
- What to Specialise in Electronics Engineering?? [03:02 am 03/04/14]
- Britain to have just one remaining coal pit by the end of 2015 [01:11 am 03/04/14]
- LV Generator Star point earthing - UK [08:35 pm 02/04/14]
- East West Rail - the Oxford to Bedford route [07:33 pm 02/04/14]
- Small nuclear power [06:06 pm 02/04/14]
The essential source of engineering products and suppliers.