Session 6: Military aircraft EMC
Session 6, Speaker 1
Edd Dunkin BEng(Hons) CEng MIET, Principal E3 Trials Engineer, QinetiQ, Air Division, MoD Boscombe Down
Hazards of Electromagnetic radiation to ordnance, instrumentation developments for High Intensity Radiated Field (HIRF) testing of aircraft
A discussion of what an electro explosive device is, what they are used in, how to instrument a typical system for EMC testing, the types of testing that can be carried out with the systems currently on the market, a discussion of the applicable standards and how data can be processed and analysed, concluding with what can go wrong if the test methods are not followed. The presentation will conclude with a short practical demonstration of an instrumented device being exposed to an RF environment.
Session 6, Speaker 2
Kieran Mayhew, EMC/HIRF Test Engineer – E3 Test, Evaluation and EM Security, QinetiQ, Farnborough, UK
The challenges of performing Transmitting Portable Electronic Device (TPED) testing on board Military Aircraft
A discussion of the challenges associated with setting up and applying TPED testing to Military Aircraft, including describing the differences between the ED130A test methods, applying either ‘net power’ or E-field pre-calibration methods. In addition the requirement to perform testing at lower frequencies to simulate HF and VHF radio devices is discussed. The paper addresses both practical set up and technical challenges applying the test to helicopter aircraft to large transport type aircraft.
Session 6, Speaker 3
Dr Geoff South
The Development of the Direct Current Injection (DCI) Method for Military Aircraft Clearance
The Direct Current Injection (DCI) method was devised as an economical means of allowing military aircraft clearances to be generated at frequencies up to VHF. The active use of the technique is, at present, limited in application to lower frequencies in the civil domain, particularly for low level characterisation for lightning and increasingly for HIRF analyses, but at frequencies below first resonance. In such programs, a relatively simple return conductor arrangement can be formed. This paper will consider the use of the technique at higher frequencies, where the design of the test requires greater effort.
This paper will briefly consider the history of the technique and discuss some of the relevant outcomes of the research projects that have taken place. The design of the return conductor is a major undertaking as it imposes restrictive limitations on usable frequency range and influences the attachment to the aircraft under test. The paper will discuss computational methods that have been used and give examples of typical designs.
The major aspect of calibration, where the radio frequency power input to the test arrangement is related to the actual clearance, is a fundamental property but has proven to be a serious drawback to its general acceptance. Possible methods will be discussed, along with representative examples of data obtained. In conclusion, the developments needed for a more general acceptance of the technique will be described.
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