Aug 31, 2012
Continuous innovation to ensure SA’s radar, electronic warfare technology remain world classBack
Africa|Aircraft|Building|Design|Environment|Industrial|Innovation|PROJECT|Projects|System|Systems|Technology|Testing|Africa|South Africa|Equipment|Radar Equipment|Systems|Wideband Real-time Signal Processing|Danny Naicker|Johann De Jager|Klasie Olivier|Warren |ADC|DRFM Technology|FPGA|Improving Radar Technology|Microwave|Radar Technologies|Radar Technology|Radio Frequency
© Reuse this
Radar and EW systems detect, track, measure, identify, protect and implement counter- measures for sensors operating in the microwave spectrum, CSIR principal systems engineer of experimental EW systems Klasie Olivier explains.
The CSIR’s EW team uses its DRFM technology for testing and evaluating EW and radar equipment in support of industrial and scienti- fic development on its own, as well as in partner- ship with principals from the public and private sectors, in line with the CSIR’s mandate.
“We have our own in-house radar development capability and we assist our radar colleagues by testing radars and assisting with radar development,” Olivier states.
“Currently, we are evaluating the typical performance specifications of the DRFM bandwidth and developing the next generation of DRFM, for which we are aiming towards 2 GHz instantaneous bandwidth – a significant improvement on the current 800 MHz,” says Olivier.
“We aim to complete this concept demonstrator by the second quarter of 2013.”
DRFM technology has continuously been improved to ensure its effectiveness, says CSIR EW team applications principal engineer Warren du Plessis.
The most significant improvement made to this technology since its inception in the 1980s has been the addition of a Field-Programmable Gate Array (FPGA) to the DRFM data path in 2007, which allows wideband real-time signal processing.
“This was a revolutionary improvement, as it made the technology more versatile,” Du Plessis notes, adding that EW researchers are constantly improving the technology to ensure its competitiveness.
When a radar sends out a pulse to monitor the external environment, such as the ocean surrounding a ship, that pulse can be captured by another vessel through the use of DRFM. It can then be manipulated and sent back to the radar.
The radar then performs processing on the received pulse, which assists in identifying whether a possible target, such as a ship or a helicopter, is nearby or approaching.
“Radar technology is well advanced and radar experts can provide the speed and distance of a target, depending on the information it receives back from the pulse it emitted,” De Jager states.
DRFM technology captures the pulses emitted by radars, digitises the information with an analogue-to-digital converter (ADC) and then manipulates the data so that the information received by a radar will not reveal the actual target’s position and other characteristics.
“We can process the captured information and manipulate the radar pulse to represent what we want it to represent so that the radar under evaluation will see only what we simulate,” he notes.
When a radar operator looks at the display of the manipulated pulse, he or she will not be able to tell that the image on display is only a simulated one and not the actual one. For example, the operator will think it is a real target that is moving away when it is actually approaching.
However, as a result of modern technology, radar can detect whether a DRFM system is creating a target by analysing the pulse it receives, says CSIR systems engineer of radar and EW systems Danny Naicker.
As a result, when we capture a pulse transmitted by radar, we have to make the image we want the pulse to project as realistic as possible.
Actual targets, such as ships or aircraft, produce radar cross section fluctuations and we need to replicate that phenomenon by using complex-scatterer technology so that the pulse we send back to the radar projects a realistic target, he explains.
“This is why technological improvement is critical in areas such as ADCs and firmware development on FPGAs,” Naicker stresses.
“It is a cat-and-mouse game. Radar researchers keep improving radar technology, which enables them to increase their sense of awareness, and the EW researchers keep improving our DRFM technology to provide an acceptable return signal to the radar for detection purposes, but which may be a false return in terms of the real position or other characteristics of the target of interest,” says Olivier.
Further, De Jager states that the CSIR holds a major advantage over global competitors because its EW and radar teams are situated in the same building. This allows researchers and engineers to adapt, compete and compare DRFM and radar technologies, while working together in ensuring that South Africa’s technology base remains among the best in the world.
“Mixed signal design is challenging, as you are mixing sensitive analogue and noisy digital signals on the same hardware platform, says Naicker, adding that the CSIR’s DRFM technology has evolved to being more than a typical DRFM.
The technology has been adapted and advanced to work as an EW receiver, a radar transmitter, a DRFM and a radar, he explains.
“The main limit with this technology is your imagination,” Du Plessis states.
CSIR Supporting the MeerKAT
The CSIR performed the characterisation of the ADC, providing the team with an evaluation performed at the intended sampling speed it would use in determining the attain- able performance levels of the eventual system.
With the measured results in hand, the SKA team had the necessary confidence to proceed with designing this ADC for integration into the MeerKAT, the CSIR states.
The MeerKAT is a midfrequency radio telescope and is considered a forerunner to the SKA. It will be the largest and most sensitive radio telescope in the southern hemisphere until the SKA is completed by about 2024.
Edited by: Chanel de Bruyn© Reuse this Comment Guidelines (150 word limit)
Creamer Media Senior Deputy Editor Online
Other Defence News
The University of Pretoria is well advanced in a programme to experimentally validate numerical simulation software developed by the Council for Scientific and Industrial Research (CSIR) to accurately model the sloshing of fuel in an aircraft's fuel tank. This was...
African Equity Empowerment Investments (AEEI) announced on Thursday that it has completed the R125m deal to acquire a 25% plus one share stake in Saab Grintek Defence (SGD). SGD is the South African subsidiary of Swedish defence and civil security company, Saab and...
South Africa’s State-owned defence industrial group Denel has announced that its recently acquired subsidiary, Denel Vehicle Systems (DVS – previously BAE Systems Land Systems South Africa or LSSA) had finalised a R900-million contract with United Arab Emirates group...
Recent Research Reports
Water 2015: A review of South Africa's water sector (PDF Report)
Creamer Media’s Water 2015 Report considers the aforementioned issues, not only in the South African context but also in the African and global context in terms of supply and demand, water stress and insecurity, and access to water and sanitation, besides others.
Input Sector Review: Pumps 2015 (PDF Report)
Creamer Media’s 2015 Input Sector Review on Pumps provides an overview of South Africa’s pumps industry with particular focus on pump manufacture and supply, aftermarket services, marketing strategies, local and export demand, imports, sector support, investment...
Liquid Fuels 2015: A review of South Africa's liquid fuels sector (PDF Report)
Creamer Media’s Liquid Fuels 2015 Report examines these issues in the context of South Africa’s business environment; oil and gas exploration; fuel pricing; the development of the country’s biofuels industry; the logistics of transporting liquid fuels; and...
Road and Rail 2015: A review of South Africa's road and rail sectors (PDF Report)
Creamer Media’s Road and Rail 2015 report examines South Africa’s road and rail transport system, with particular focus on the size and state of the country’s road and rail infrastructure and network, the funding and maintenance of these respective networks, and...
Defence 2015: A review of South Africa's defence sector (PDF Report)
Creamer Media’s Coal 2015 report examines South Africa’s coal industry with regards to the business environment, the key participants in the sector, local demand, export sales and coal logistics, projects being undertaken by the large and smaller participants in the...
Real Economy Year Book 2015 (PDF Report)
There are very few beacons of hope on South Africa’s economic horizon. Economic growth is weak, unemployment is rising, electricity supply is insufficient to meet demand and/or spur growth, with poor prospects for many of the commodities mined and exported. However,...
This Week's Magazine
The BMW Group will invest R6-billion at BMW Group South Africa’s (BMW SA’s) Rosslyn plant to produce the next-generation X3 sports-activity vehicle (SAV) for the local and export markets. Rosslyn will continue production of the current 3 Series through its lifecycle,...
The lack of consequences for poor performance and transgressions on the part of contractors remains a significant hurdle to tackling South Africa’s service delivery challenges, delegates heard at the Consulting Engineers South Africa Infrastructure Indaba, on...
City of Ekurhuleni executive mayor Mondli Gungubele earlier this month officially named the city’s bus rapid transit (BRT) system, Harambee.
About 58% of unstructured data stored by companies is dark data, which means that the value or regulatory importance of the data has not been determined. Subsequently, most of the stored data add costs, rather than increasing revenue or reduce regulatory risks, says...
Effective logistics, import/export and manufacturing consulting services require detailed industry knowledge and experience, but can add significant value to these industries by providing expert advice on various technical elements in their value chains, says...