Radar Analysis and Support System – RASS

Whether you have a ‘legacy’ system or a Mode-S or 3D radar system, the RASS tool will suit your analysis requirements. Beyond radar, RASS can also be used to evaluate ADS-B and Multilateration Systems.
RASS is a suite of state-of-the-art analysis tools that assist ANSPs, Defence Agencies or Maintenance Repair Organisations to evaluate the performance state of a surveillance system against manufacturer’s specifications, contracted performance requirements or international regulatory requirements for safe air traffic management (e.g. ICAO – International Civil Aviation Organisation). RASS is a recognised evaluation tool used to analyse radar performance and is currently in use worldwide by leading industry organisations to verify radar performance against mandated standards (i.e. EUROCONTROL, North Atlantic Treaty Organisation – NATO, United States Air Force – USAF and Federal Aviation Administration – FAA).

RASS-S is the best tool available to comprehensively test and evaluate a Radar system. A combination offering made up of eight individual modules which gives RASS-S the capability to test any Radar at a component level.

A must have product for all Radar maintenance teams around the world. RASS-M has the ability to quickly identify faults in the system and isolate the problem area to help the maintenance teams with quick repair times.

RASS-R is termed the backbone of the RASS suite because it’s the only system in the market which allows our clients to analyse the data exchange between the Radar system and the display device. Discrepancies often creep into the data, and only RASS-S has the capability to identify and help our clients rectify the error.

Radar Field Analyser

The first vital part of the radar chain is the antenna. Possible errors in this element can be detected using the Radar Field Analyser (RFA641), the RASS-S instrument intended for antenna and RF receiver measurements of (M)SSR ATC radars and primary radars in L- and S-band. For this purpose, the radar does not have to be taken out of operation.

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Radar RF Test-set

A large part of the radar transmission/reception chain is formed by RF components. In the LVA antennas of modern (M)SSR and 3D PSR radars RF signals are split and distributed along the different elements of the array antenna. Possible errors in all of these elements can be measured by the RF Testset. The RFT646 is a versatile dual-channel L-band Tx/Rx measuring unit, capable of generating fixed or swept frequency RF test signals in the 900-3500 MHz range.

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USB Power Meter

The UPM772 is a broadband log receiver (10MHz to 10GHz) which can operate on L/S/C/X-band.

    In the field of radar the UPM772 can be used in three different applications:

  • as pulse power meter on site or in the field;
  • as measurement tool to extract antenna diagrams;
  • as field strength meter for investigation of health and safety conditions.


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Radar Interface Module

The radar processor produces several trigger and azimuth signals, and it receives the (up to three channel) video input from the receivers. This data will pass an intermediate video stage. The radar system will process this data and produce plot data, available as serial data messages. Data at those two stages can be intercepted by the Radar Interface Module, which is intended for detailed recording of video level reply signals and digital trigger signals as well as serial plot and track data, independent of the data format.

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Radar Data Recorders

A vital part of the radar chain is the data processing unit, with at its output a data stream containing radar plots or tracks under a specific format. The IE Radar Data Recorders are designed to record this data which can be displayed and analysed by dedicated RASS software tools after conversion into a uniform format.

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Radar Gyroscope & Inclinometer

The Radar Gyroscope and Inclinometer (RGI596) and the Radar Timing Interface(RTI966), provide a tool to evaluate the mechanical and structural design of the antenna pedestal and tower. The RGI596 measures the angular velocity and planar angle of the antenna, at the same time a RTI966 measures and records the azimuth information from the encoder (ACP and ARP). The rotational information data combined with the encoder signal provide essential information on encoder accuracy and platform levelling.

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Radar Environment Simulator

The RES28x simulates your radar’s environment, including up to 2000 SSR or Mode-S targets, reflectors and LVA antenna behavior on RF level. This is done by injecting into the antenna connectors of your radar all the required RF signals that would occur in real life situations, hereby reacting correctly to the radar’s interrogations as real transponders would do. The aim of this is to present a known reference environment to the radar and compare the radar output data to the input scenario.

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Transmitter Test Bench & Radar Target Generator

Transmitter Test Bench The TTB930 or Transmitter Test Bench is designed to measure essential SSR transmitter parameters (interrogations) and assist in the interfacing between the radar and the IE RES28x (Radar Environment Simulator). Interrogations are continuously measured by the TTB930; it can be used with or without the RES. The TTB930 software measures the critical parameters of the 1030Mhz interrogations such as timing, pulse shape, frequency and phase contents sent by the SSR radar for MKX (M1, 2, 3, C), Mode 4, Mode-S and Mode 5 interrogations. The RTG (Radar Target Generator) is designed to generate primary radar returns. It can be placed in the field (Remote Test Target) or connected to a radar (on site target injection).
Radar Target Generator In all cases, the RTG will detect and preserve the radar pulse, apply a fixed and highly precise delay and retransmit the pulse with the appropriate power, pulse-width, frequency and Doppler shift. This is a high fidelity simulation of real targets and allows for precise scenarios for testing. The Towertrack moves the horn antenna up and down, according to a mechanical scenario, to simulate the elevation angle of the test target. When the two pre-programmed scenarios of the RTG and Towertrack are synchronised, the radar could observe the firing of a shell or a rocket.

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Data Handling

  • Data Handling Module (DHM): to record, replay and convert surveillance sensor data streams
    • The Data Handling Module (DHM) runs different data handling functions. It is fully automatic and will be installed and set-up once by an expert. The DHM can input, output and record data and is able to convert the data stream to a number of specified formats. This data can then be used by every other tool of the RASS-R toolbox. The DHM also acts as the “backbone” of the whole RASS-R toolbox, because all other tools work with data processed by the DHM.
  • Data Replay (DATA REPLAY): to replay with corrected timestamps
    • The RASS-R Data Replay tool is used for re-injection of data with corrected timestamps, i.e. current UTC time. In combination with the DHM, recorded data can be replayed and re-injected in for example the ACC.

Display and Monitoring

  • Multi Radar Display 3 (MRD3 ): to display multiple radar sources simultaneously
    • The MRD3 is able to display several radar systems simultaneously in overlay (6 out of N selection), offering a way to visually compare the data of multiple radar stations in real time. The MRD3 can handle data originating from PSR/(M)SSR/Mode-S radars, ADS-B ground stations, MLT systems and multi-radar tracking systems.
  • Technical Maintenance Display 3 (TMD3 ): to display one radar source only
    • The TMD3 is an extremely powerful display system for use in daily radar monitoring and maintenance activities. The TMD3 system allows you to perform an on-the-spot real-time check-up of the radar’s performance. The use of the RIM782 for video signal acquisition and processing, together with the powerful graphical software for displaying of radar data and video, creates a very powerful and versatile local display for modern radars.

Surveillance Sensor Performance Assesment Toolset (SSPAT)

  • Radar Comparator Mono/Dual (RCM/D): offline analysis of radar data
    • The Radar Comparator is an essential tool for radar performance analysis based on operational data from one or several radars. The Radar Comparator Mono (RCM) uses single radar opportunity data for the calculation of probability of detection (Pd), false plot rate and correct (SSR-) code probability. The Radar Comparator Dual (RCD) uses dual radar data for the calculation of systematic errors (range, gain, relative time, azimuth biases) and accuracy measurements (range, time and azimuth errors). Moreover range, time and azimuth accuracy can also be estimated using mono radar data only.
  • Track Analysis (TRACKAN): realtime analysis of radar data
    • TRACKAN is a real-time, trajectory-based, 24h/7d radar data analysis tool. TRACKAN is designed to automatically detect and report the following problems: non-compliant transponders, general detection problems, aircraft with too low Pd, abnormal trajectories, average Pd on code detection performance figures,… TRACKAN takes into account coverage maps. It can handle PSR, (M)SSR, Mode-S and ADS-B data and has full Mode-S capabilities.
  • Coverage Map Calculator (CMC): generation of screening and relief files
    • The RASS-R Coverage Map Calculator (CMC) uses accurate digital geographic data (SRTM-files) gathered on several NASA space shuttle missions to calculate radar theoretical and real coverage. Especially for mountainous regions this coverage volume prediction is essential. The tool produces high resolution coverage maps, and can set coverage bits in radar data structures. Other RASS-R tools as the RCM/D and TRACKAN can then use these coverage bits for more accurate calculation of the radar performance.

RASS-R Hardware

The RASS-M tools (Radar Analysis Support System for Maintenance activities) are used by radar technicians during recurring maintenance activities to collect and analyse the data of the radar under test. The RASS-M hardware kit consists of several light-weight, small boxes. The RASS-M recorded data is fully compatible with RASS-S; furthermore the RASS-M suite has the option to be upgraded to RASS-S.
Using RASS-M the evaluation of the radar system will be completed quickly and with little interference to the controllers since the RASS-M system can be connected to signals which are already available and this under operational conditions. This advantage combined with the simple connections and easy-to-use user-interface ensure the radar technician that RASS-M is in fact the all-round radar maintenance tool.