RESOURCES

Maximize your ISR capabilities for air, maritime, and land operations. CRFS’ proven RF sensor integrated into a high-performance tethered drone enables variable-height monitoring of VHF, UHF, and SHF transmissions. It supports tactical surveillance, geolocation as part of a TDoA network, signals intelligence, and over-the-hill reconnaissance to enable rapid decision-making.

This guide outlines the technical capabilities, architecture, and deployment flexibility of CRFS’ airborne target identification solution. It demonstrates how passive RF sensing can fill critical gaps in the air defense kill chain—from wide-area detection to precise geolocation—while supporting interoperability with modern defense infrastructure.

Designed with an Uncrewed-Vehicles Platform Manufacturer for a NATO member, CRFS created a self-contained spectrum monitoring and TDoA system that fits onto a Group 1 USV. The system facilitates ISR missions for the VHF and UHF bands in hostile environments.

RFeye Site has traditionally empowered spectrum managers to identify and geolocate signals of interest emitted in or around an RFeye Node network. RFeye Site Simulator provides experienced and trainee spectrum managers with the same capabilities but employs simulated RF sensors. By simulating real-world scenarios, this powerful tool can be used for interference hunting, strategic planning, and spectrum allocation.

An easily deployable tool to extend capabilities for air, maritime, and land operations. This compact, lightweight RF sensor and high-performance tethered drone will enhance spectrum monitoring, tactical surveillance, geolocation, signals intelligence, and over-the-hill reconnaissance to enable rapid decision-making. 

A robust, reliable extension for intelligence and electromagnetic EW system direction finding in a tactical form-factor. The system is small, rapidly deployable and ruggedized. It is suitable for stationary and mobile (dismounted) deployment.

Discover our advanced superheterodyne RF technology for superior sensitivity, frequency stability, and selectivity. Compare Node specifications, view the new RFeye Node models, and discover what makes them unique.

Ultra wide frequency, high performance radio direction finding up to 40 GHz.

High performance twin channel system for simultaneous wideband radiomonitoring and direction finding.

CRFS’ compact Direction Finding (DF) Heads are a sub-system for Communications Intelligence (COMINT) and Electronic Warfare (EW) applications.

This guide explores critical strategies for identifying and managing these risks, including RF interference detection, VHF and ILS compliance, GNSS jamming countermeasures, and advanced drone detection methods.

This white paper discusses how adding RF technology to existing port security measures can help augment port protection and security.

RFeye Site Simulator provides EW operators with simulated RF sensors. This powerful tool can be used for teaching spectrum operations and conducting wargames, allowing EMSO professionals to simulate scenarios and resolve tactical problems. 

Dr Withington’s in-depth analysis highlights essential lessons from the conflict for future warfare. 

Learn why RF sensors provide significant advantages for UAV ISR missions, enhancing intelligence, surveillance, and reconnaissance capabilities. Discover EW & ISR lightweight RF sensor payload technology and overcome engineering challenges.

Strategic intelligence gathering, early warning, signal-based detectors, and accurate geolocations can all help avoid conflict, manage hostile neighbors, and detect terrorist activity or unauthorized movement of goods and people. 

This white paper was guided by the results of a border security survey aimed at border control, border security, and military personnel tasked with national security and defense. It examines how RF sensor technology can be used to tackle modern border security threats.

The RFeye Node 100-18 LW offers the same high performance and real-time spectrum operations as our standard RFeye Node 100-18 sensor, but in a smaller, lightweight form well suited for all types of autonomous systems and operations needs

CRFS provides a range of APIs, and by leveraging them customers can seamlessly integrate the capabilities of CRFS software into their proprietary systems, thereby automating tasks, which would otherwise have to be performed manually.

The system, hardware, software, and APIs that drive missions carried out by governments, militaries, regulators, R&D companies, and space operators all rely on CRFS technology and support.

Extracting and classifying RF recorded I/Q signals.

Continuous real-time technical surveillance counter measures for sensitive or secure facilities.

Here are ten things spectrum regulators can do to address OPEX and CAPEX challenges when finances are limited.

CRFS Nodes are small, rugged, lightweight, powerful sensors (receivers and recorders) with outstanding performance and endurance. They are highly versatile, have a low SWaP, and can be used for fixed, mobile, tactical, and in-building deployments. 

This white paper provides an overview of contemporary radio spectrum monitoring and the sensor and geolocation technologies required to meet emerging challenges.

Obtain RF intelligence, maintain spectrum awareness, and achieve mission-critical objectives.

CRFS x Equinox innovate systems: RFeye aerial deployment solutions.

Introducing RFeye V-Track: RFeye Nodes can be deployed on a 20m mast for mobile missions. 

On today’s battlefield, achieving spectrum dominance is key to ensuring military superiority and tactical advantage. To dominate the spectrum, operators must identify and locate a threat by turning real-time signal capture and emitter data into actionable intelligence. 

RFeye A150: Recovery

Radio receivers are essential for spectrum monitoring operations. Therefore, an understanding of receivers' key radio parameters and minimum recommended values allows spectrum managers to select the best radio receiver for their spectrum monitoring solution.

This white paper addresses the basic operating principles of 3D TDoA; Practical limitations on its accuracy; Applications of the technique.

Transportable direction finding system combining broadband monitoring and DF on wideband signals to 8 GHz.

How to create a best-of-breed Technical Surveillance Counter Measures (TSCM) solution

De-risking investment decisions

Enabling EMSO to safeguard situational awareness

Challenges faced by modern militaries and methods to streamline and automate spectrum management

Best practices for RF signal capture and playback

How to detect, monitor and defeat

D&D developments and methodologies that affect modern SIGINT operations

Capture, decode & demodulate best practice

How to record, capture & extract RF signals from big data

How and why TDOA is the new go to RF geolocation method

Examine the limitations and ways to use the data

Automate spectrum management tasks to reduce workloads

Using simulated receivers and transmitters in CRFS’s RFeye software

AOA (Angle On Arrival) geolocation of a sweeping (chirp) continuous wave transmitter in a complex signal environment

This white paper outlines the various forms of AoA , including how they work, how they can be applied in practice, and how they can be combined with other geolocation techniques, such as time difference of arrival (TDoA).

This white paper explores how to enhance standard geolocation techniques such as AoA (Angle of Arrival), TDoA (Time Difference of Arrival), and PoA (Power on Arrival) by using the advanced signal processing methods employed by RFeye software and hardware. 

This white paper outlines the most important geolocation techniques, explains the differences between them, and provides an outline of their applications.

Explanation by Alistair Massarella - CTO & Co-founder of CRFS.

 An AOA Illustration.

Technical Surveillance Countermeasures.

Understanding multipath RF for direction finding.

A plug-and-play portable, intelligent RF receiver.

Transportable direction finding system combining broadband monitoring and DF on wideband signals to 18 GHz.

Tactical direction-finding head with compact DF antennas.

Continuous real-time TSCM and in-place monitoring system for sensitive buildings and secure facilities.

Class-leading RF performance for advanced capability, real-time spectrum operations or deployment on any spectrum critical site.

Class-leading RF performance and extended instantaneous bandwidth for 24/7 ITU-compliant spectrum monitoring and radio geolocation.

Class-leading RF performance for advanced capability, real-time spectrum operations or deployment on any spectrum critical site.

RF performance all the way up to 40 GHz for advanced capability, real-time spectrum operations or deployment on any spectrum critical site.

The RFeye SenS Remote 100-18 combines the RF and edge-processing capabilities of the RFeye Node 100-18 together with the high-speed recording feature of the RFeye SenS family.

Mission-ready integrated solution for standalone spectrum surveillance and mobile monitoring operations

Mission-ready integrated solution for standalone spectrum surveillance and mobile monitoring operations

Schedule & automate spectrum monitoring in multi-user environments

Tactical spectrum monitoring & geolocation solutions

How combining ground & air-based RF sensors improved ISR and target acquisition

How a renowned R&D company recorded I/Q data in the field without bulky lab equipment 

How a government agency secured its borders in a volatile region

How a national force secured its borders with reliable spectrum data

How a NATO partner built an air defense platform to increase national security 

How a Southeast Asian government intelligence service secured multiple borders  

How the Malta Communications Authority replaced old equipment with state-of-the-art solutions

How a NATO member monitors the spectrum of multiple locations from one central location

How TEKEVER & CRFS collaborated to fit UAS with ultra-sensitive RF receivers as a payload 

How the Brazilian National Telecoms Agency used a remote distributed network at the world’s biggest sporting event 

How a security service detects and geolocates unwanted signals to safeguard national security

How Rijksinspectie Digitale Infrastructuur embraced effective spectrum monitoring  (and caught criminals in the process) 

How a spaceport operator ensures the integrity of its payloads with 24/7/365 RF monitoring

How the TDRA ensured seamless communication with an RF network that endured temperatures above 45°C

The annual listing of 10 companies that are at the forefront of providing drone solutions and impacting the marketplace

RF matters because it is critical for today’s electronic devices – the foundation of our modern, wirelessly-connected lives.

CRFS sent border security agencies and forces across the globe a survey to understand their perspectives on integrating radio frequency (RF) technology into their operations. 

How ANFR chose a long-term solution for spectrum monitoring & emerging tech while ensuring safety during major sporting events.

Low Probability of Intercept (LPI) signals represent a sophisticated class of technology that is pivotal for enhancing the stealth and efficacy of modern communication and radar systems. 

The RFeye Node Plus 100-18 is an advanced receiver with extra fast processing, enhanced signal capture, detection, POI, and full 100 MHz I/Q recording and streaming over a 10GigE interface.

The RFeye Outdoor Kit (ODK) systems offer a range of flexible mounting kits for attaching RFeye Nodes to outdoor structures such as masts and building structures. The Outdoor Kits are designed to resist build-up of ice and snow in cold climates, and incorporate a sunshield to minimise solar loading in hot climates.