Within NASIC
What Foreign Signals Reveal
Radio-frequency characterization helps analysts understand how foreign radars, datalinks and seekers transmit, detect and resist interference.
On this page
- What RF characterization measures
- How emissions support countermeasure design
- Why seekers and datalinks need hardware testing
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Introduction
When foreign aircraft, missiles or air-defence systems arrive at facilities such as the National Air and Space Intelligence Center (NASIC) for exploitation, some of the most valuable information comes not from disassembly but from radio-frequency (RF) testing. Radars, datalinks and missile seekers reveal critical aspects of their behaviour through the signals they transmit, receive and process. By measuring those signals under controlled conditions, analysts can determine how a system detects targets, resists jamming, communicates with other platforms and guides weapons to impact. RF characterisation turns electronic emissions into intelligence, helping transform a captured device from an unknown threat into a measurable and understandable system.[Keysight United States]keysight.comKeysight United StatesRadar MeasurementsLearn radar basics, the fundamentals of measuring basic pulsed radar in radar systems and availab…
Unlike visual inspection, RF testing exposes operational behaviour. A radar may appear sophisticated externally, yet its pulse patterns, frequency agility, antenna behaviour and signal-processing methods can reveal strengths, weaknesses and design compromises. The resulting data becomes essential for threat identification, electronic warfare planning and countermeasure development.[ResearchGate]researchgate.netResearch Gate An Expert System For Threat Analysis In Radar Warningemitter descriptors, are used to track the detected radar in time. The processor uses these parameters to identify the emitters, assess t…
What RF Characterisation Measures
RF characterisation focuses on how a system behaves electromagnetically rather than how it looks mechanically. Engineers place hardware in controlled test environments and record the signals it emits or responds to. These measurements can reveal the system’s operating logic and intended battlefield role.[MiCOM Labs]micomlabs.comMiCOM LabsRadar Testing Procedures: RF Accuracy & ComplianceProvides a controlled environment for measuring unintended emissions. Use an…
Key parameters include:
- Operating frequency and frequency-hopping behaviour.
- Pulse repetition frequency (PRF) and pulse timing.
- Pulse width, power output and modulation techniques.
- Antenna scan patterns and beam steering behaviour.
- Receiver sensitivity and target-acquisition logic.
- Datalink transmission characteristics.
- Resistance to interference and deceptive signals.[maurymw.com]maurymw.comMaury Microwave Essential Measurements for Today's Most DemandingMaury MicrowaveEssential Measurements for Today's Most Demanding…July 8, 2022 — To simplify the process for instrumentation users, man…
These measurements matter because modern radar systems are often identified by their emission fingerprints. Radar warning receivers and electronic-support systems classify threats using characteristics such as pulse timing, scan behaviour and frequency patterns. The same attributes that allow military aircraft to recognise hostile radars can also help exploitation teams identify the design philosophy and performance envelope of a captured system.[researchgate.net]researchgate.netResearch Gate An Expert System For Threat Analysis In Radar Warningemitter descriptors, are used to track the detected radar in time. The processor uses these parameters to identify the emitters, assess t…
Why Signal Behaviour Often Matters More Than Hardware Layout
Two radars can share similar antennas, processors and packaging while performing very differently. RF testing reveals distinctions that physical inspection alone cannot uncover. Frequency-agile radars, for example, may rapidly shift operating frequencies to complicate interception or jamming. Measuring those shifts provides insight into electronic protection strategies and spectrum-management techniques.[NTRL]ntrl.ntis.gov· Radar homing · Radar transmitters · Homing devices · Guided missile trajectories · Terminal homing · Electronic…Read more…
Likewise, pulse-compression methods, waveform shaping and modulation schemes can indicate how a radar balances range, accuracy and resistance to electronic attack. Such characteristics often define combat effectiveness more directly than visible hardware features.[Keysight United States]keysight.comKeysight United StatesRadar MeasurementsLearn radar basics, the fundamentals of measuring basic pulsed radar in radar systems and availab…
How Emissions Support Countermeasure Design
One of the principal reasons for exploiting foreign RF systems is to improve defensive and offensive electronic warfare capabilities. Once engineers understand how a radar transmits and processes signals, they can assess which techniques are most likely to confuse, deceive or avoid it.[Leidos]leidos.comElectronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R…
Modern electronic warfare depends heavily on threat libraries. These databases contain detailed descriptions of radar and seeker signal characteristics, allowing warning systems to recognise emitters and classify threats in real time. The quality of those libraries improves dramatically when they are built from direct measurements of actual hardware rather than estimates derived from observation alone.[researchgate.net]researchgate.netResearch Gate An Expert System For Threat Analysis In Radar Warningemitter descriptors, are used to track the detected radar in time. The processor uses these parameters to identify the emitters, assess t…
RF testing can reveal:
- Which radar modes are used for search, tracking and missile guidance.
- Whether a radar changes behaviour after detecting jamming.
- How quickly it adapts to interference.
- Which frequencies and waveform structures are most important to its operation.
- Whether it employs low-probability-of-intercept techniques designed to reduce detectability.[researchgate.net]researchgate.netResearch Gate An Expert System For Threat Analysis In Radar Warningemitter descriptors, are used to track the detected radar in time. The processor uses these parameters to identify the emitters, assess t…
The resulting intelligence supports the development of radar warning receivers, electronic-support measures, expendable decoys and airborne jammers. Rather than treating an adversary system as a black box, analysts can target specific vulnerabilities identified through measurement.[Leidos]leidos.comElectronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R…
Building Realistic Threat Representations
A significant challenge in electronic warfare is reproducing foreign emitters accurately enough for testing and training. Measured RF data allows engineers to create representative threat simulations that mimic real radar behaviour rather than simplified approximations. Such simulations can then be used to evaluate aircraft self-protection systems, warning receivers and electronic attack equipment under realistic conditions.[core.ac.uk]core.ac.ukCOREElectronic combat hardware-in-the-loop testing in an openAn open loop simulator provides a one way path from the simulator to the EC system for a representative threat signal to travel.Read more…
This is particularly important because modern radars often change modes dynamically. A static description of a threat is less useful than understanding how it behaves across an engagement sequence. RF characterisation provides that behavioural picture.[ResearchGate]researchgate.netResearch Gate An Expert System For Threat Analysis In Radar Warningemitter descriptors, are used to track the detected radar in time. The processor uses these parameters to identify the emitters, assess t…
Why Seekers and Datalinks Need Hardware Testing
Missile seekers and datalinks present a special challenge because they combine RF transmission, signal processing and guidance logic. Technical documents may describe broad capabilities, but direct testing reveals how those functions actually operate.[NTRL]ntrl.ntis.gov· Radar homing · Radar transmitters · Homing devices · Guided missile trajectories · Terminal homing · Electronic…Read more…
What Active RF Seekers Reveal
An active RF seeker effectively contains a miniature radar inside the missile. By measuring its emissions and observing its responses to controlled targets, analysts can determine how the seeker searches, acquires and tracks. Testing may reveal operating frequencies, discrimination methods, antenna characteristics, frequency agility and susceptibility to electronic countermeasures.[NTRL]ntrl.ntis.gov· Radar homing · Radar transmitters · Homing devices · Guided missile trajectories · Terminal homing · Electronic…Read more…
Even subtle details can be valuable. Characteristics such as polarisation, frequency discrimination and tracking behaviour provide clues about how the seeker distinguishes intended targets from clutter, decoys or interference. These details directly influence how difficult the missile is to defeat.[NTRL]ntrl.ntis.gov· Radar homing · Radar transmitters · Homing devices · Guided missile trajectories · Terminal homing · Electronic…Read more…
Understanding Datalink Behaviour
Many modern air and missile systems rely on RF datalinks for guidance updates, sensor sharing or command-and-control functions. Hardware testing allows analysts to measure transmission frequencies, modulation methods, bandwidth usage and network behaviour.[Leidos]leidos.comElectronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R…
These observations help answer practical questions:
- How dependent is the weapon on external guidance?
- Can communications be interrupted or degraded?
- Does the system employ frequency hopping or encryption-related transmission patterns?
- How resilient is it in a congested electromagnetic environment?
Although encryption may protect message contents, the structure and behaviour of transmissions often remain highly informative. RF characterisation therefore contributes to understanding operational dependencies even when the underlying data cannot be read directly.[Leidos]leidos.comElectronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R…
From Captured Hardware to Operational Intelligence
Within foreign materiel exploitation programmes, RF testing bridges the gap between possession of hardware and understanding of capability. Physical examination may reveal manufacturing methods, component choices and design lineage, but emissions testing reveals how a system actually behaves when operating as intended.[Leidos]leidos.comElectronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R…
For organisations such as NASIC, the value lies not merely in cataloguing a foreign radar or seeker but in converting measured signal behaviour into actionable intelligence. Emission fingerprints improve threat recognition. Seeker characterisation supports defensive-system design. Datalink analysis exposes operational dependencies. Together, these measurements provide a detailed picture of how foreign air and missile systems sense, communicate and fight in the electromagnetic spectrum.[leidos.com]leidos.comElectronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R…
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Endnotes
1.
Source: keysight.com
Link:https://www.keysight.com/nl/en/assets/7018-01694/application-notes/5989-7575.pdf
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Keysight United StatesRadar MeasurementsLearn radar basics, the fundamentals of measuring basic pulsed radar in radar systems and availab...
2.
Source: leidos.com
Link:https://www.leidos.com/capabilities/cyber/electronic-warfare
Source snippet
Electronic WarfareDatalinks Computers (including software algorithms) RF and EO/IR missile seekers. Using data analysis, reverse. R...
3.
Source: researchgate.net
Title: Research Gate An Expert System For Threat Analysis In Radar Warning
Link:https://www.researchgate.net/publication/265918287_An_Expert_System_For_Threat_Analysis_In_Radar_Warning_Receivers
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emitter descriptors, are used to track the detected radar in time. The processor uses these parameters to identify the emitters, assess t...
4.
Source: ntrl.ntis.gov
Link:https://ntrl.ntis.gov/NTRL/dashboard/searchResults/titleDetail/ADA111647.xhtml
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· Radar homing · Radar transmitters · Homing devices · Guided missile trajectories · Terminal homing · Electronic...Read more...
5.
Source: dokumen.pub
Link:https://dokumen.pub/electronic-warfare-test-and-evaluation.html
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Electronic Warfare Test and EvaluationThis handbook is to introduce the novice to a disciplined approach to EW testing, it will also serv...
6.
Source: core.ac.uk
Title: COREElectronic combat hardware-in-the-loop testing in an open
Link:https://core.ac.uk/download/pdf/36720983.pdf
Source snippet
An open loop simulator provides a one way path from the simulator to the EC system for a representative threat signal to travel.Read more...
7.
Source: rfessentials.com
Link:https://rfessentials.com/resources/block-diagrams/radar-warning-receiver/
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RF EssentialsRadar Warning Receiver (RWR) | Block DiagramA Radar Warning Receiver (RWR) is a passive electronic warfare system that detec...
8.
Source: micomlabs.com
Link:https://micomlabs.com/radar-testing-procedures/
Source snippet
MiCOM LabsRadar Testing Procedures: RF Accuracy & ComplianceProvides a controlled environment for measuring unintended emissions. Use an...
9.
Source: maurymw.com
Title: Maury Microwave Essential Measurements for Today’s Most Demanding
Link:https://maurymw.com/wp-content/uploads/2021_01_01_MWJ-Radar-Article_v2.pdf?srsltid=AfmBOopO1UiedsH4QJByVLu2-bWdz1wFI7Y7qJ39_2l_Yzwc9u7m_2y7
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Maury MicrowaveEssential Measurements for Today's Most Demanding...July 8, 2022 — To simplify the process for instrumentation users, man...
Published: July 8, 2022
Additional References
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Source: novelic.com
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Comprehensive Radar CharacterizationBy eliminating external RF noise and attenuating a wide range of reflected waves, we are able to anal...
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Radar Warning SystemThe Radar Warning Receiver (RWR) systems have the tasks to detect the E.M. Signals emitted by radar systems and to is...
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of Missile Simulation and Flight Mechanics...The hardware typically included in a simulation are airborne missile computers, ground base...
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Characterization of RF Seeker for MisalignmentsRF seeker is used in terminal guidance of interceptor missiles. Seeker test data in HWILS...
14.
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radio-frequency and intermediate frequency hardware. The first two volumes in this series describe basic principles, some of which are tr...
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ce. hardware-in-the-loop facilities, the Advanced Seeker...
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RADAR AND ELECTRONIC WARFARE SYSTEMS...Designed to detect, classify and track small and high maneuvering targets, Leonardo's...
17.
Source: theochem.ru.nl
Title: Theochem Radar warning receiver
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Radar warning receiver - Knowino19 Dec 2010 — A radar warning receiver (RWR) detects radar signals that might be targeting the pl...
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Source: tno.nl
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threats earlier, faster and with...Read more...
19.
Source: Wikipedia
Title: Radar warning receiver
Link:https://en.wikipedia.org/wiki/Radar_warning_receiver
Source snippet
Radar warning receiverTheir primary purpose is to issue a warning when a radar signal that might be a threat is detected, like a fight...
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