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AN/ALQ-135

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David


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Registered: August 2001
Posts: 46,799
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Function: Internal countermeasures set.







Description: The F-15 TEWS consists of the AN/ALR-56C radar warning receiver (RWR), the AN/ALQ-135 internal countermeasures set (ICS), the AN/ALQ-128 electronic warfare warning set, and the AN/ALE-40/45 countermeasures dispenser. The TEWS provides electronic detection and identification of both surface and airborne threats. In addition, it allows for activation of appropriate countermeasures to include electronic jamming and dispensing of expendables such as chaff and flares Integral to the F-15 TEWS, the ALQ-135 ICS is an internally mounted responsive jammer designed to counter surface to air threats with minimum air crew activity. The system is sized to fit into the limited space of the F-15E interdiction aircraft's ammunition bay although upgraded components have also been retrofitted into the F-15C air superiority variant. The system has an improved reprogramming support capability to rapidly change pre-flight message (PFM) software in response to changing threat parameters and mission requirements. The ALQ-135 ICS has been fielded in several phases to provide incremental improvements to jamming coverage. Phase one has provided an initial Band 3 capability that includes integrated operation with both the F-15E fire control radar and the ALR-56C RWR. ALQ-135 ICS Band 3 capability currently allows full interoperability and robust jamming techniques against modern pulse Doppler radar. Full system capability requires the installation and integration of Band 1.5 hardware to provide coverage against threats operating in the lower frequency range. . The F-15 TEWS AN/ALQ-135 Band 1.5 contributes to full-dimensional protection by improving individual aircraft probability of survival through improved air crew situation awareness of the radar guided threat environment, cueing of both active and passive counter measures in Band 1.5 frequency spectrum, and waveform select feature for jamming optimization against specific threats.



AFOTEC was directed to conduct an interim TEWS OA to characterize the operational capabilities and limitations of the fielded systems and assess readiness for IOT&E. The OA concluded in September 1994 recommended five ALQ-135 improvements: interoperability with the APG-70 radar; system response times; built-in-test (BIT) displays; BIT accuracy; and low band frequency coverage for the F-15E (i.e., Band 1.5).



FOT&E operations conducted by the United States Air Force Air Warfare Center (USAFAWC) concluded in August of 1996, addressed ALQ-135 Band 3 ICS interoperability with the APG-70 radar and improvements in the BIT displays. The USAFAWC is currently conducting FOT&E at the Multi-Spectral Threat Environment (MSTE) range located at Eglin AFB to evaluate intra-flight (wing man) compatibility, the advanced threat de-interleave processor (for improved system response times), and jamming effectiveness and BIT upgrades.









History: The ALQ-135 is an outgrowth of an early 1980s feasibility demonstration and follow-on quick reaction capability (QRC) high band jammer developed to counter rapidly changing threats. Developmental problems precipitated a restructuring of the ALQ-135 ICS program in 1988 to provide incremental capabilities. A TEWS EOA of the Phase I Band 3 ICS was planned in July 1989 to support F-15E IOC. However, technical problems delayed EOA start until July 1990. Fifteen sorties were flown against threat simulators on the Eglin AFB, FL range complex in air-to-air and air-to-ground mission scenarios. The ICS demonstrated the capability to identify and counter most current threats in a limited density environment, but the test indicated additional software and hardware development was needed to achieve desired operational capabilities.



· Date: Tue February 11, 2003 · Views: 3387
· Filesize: 9.1kb · Dimensions: 200 x 150 ·
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Keywords: AN/ALQ-135


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