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TwInvis – Passive RadarSILENT SURVEILLANCE OF SILENT OBJECTS
TwInvis is a passive radar that adds a new dimension to the world of surveillance and situational awareness.
It offers decisive operational advantages: it cannot be located due to the absence of any transmitted energy and it does not need any emissions from targets to locate them. TwInvis avoids adding to an already over-crowded electromagnetic spectrum and works instead by using existing VHF and UHF transmissions from analogue and digital radio as well as television.This makes it perfect for:•covertsurveillancetasks•useinareasofelectromagneticcongestion•gapfilling•wherejammingisaconcern.
Populatedareasallovertheworldhavesufficienttransmitter-of-opportunity coverage for TwInvis to use. However, the system can also work in sparsely popu-lated areas.
This is achieved by the use of cooperative transmitters deliveringeithercontentlikemusicorjustwhitenoise.
Light, small and easy to deploy, TwInvis is equally home in urban areas or remote borders. Its economical price and maintenance and silent operation make it the right system to enable coverage in “white spots” anddetectionoftargetsformerlyflying“undertheradar”. It even is considered to be accurate enough forapplicationintheAirTrafficControldomain.
For its 3D real time and instant omnidirectional track-ing, TwInvis uses state of the art processing and current high-end computing platforms. This allows the exploitation of more than 20 transmitters simulta-neously.
Deployableinamobile,easilyrelocatableorasafixedsystem, TwInvis also comes equipped with a mission planningtooltofindthebestsensorlocationandpredict the scenario performance.
Thisdocumentisnotcontractual.Subjecttochangewithoutnotice. © 2018 HENSOLDT. HENSOLDT and its logo are registered trademarks. All rights reserved. // 0518 E 0570
HENSOLDTWoerthstr. 85 / 85077 Ulm / GermanyT: +49 731 392 52 13 / [email protected]
TwInvis Passive Radar SystemNo own transmitter, receiver only
Applications of Passive Radar
General application approach• “See without being seen” scenarios• Gapfiller/sensitivespotcoverage• Radar performance where active radars
are no option• Detects non-emitting targets• TwInvis sensor fusion with other sensors
like active radars & PET• Sensor clusters extending coverage
or accuracy• Usable without authority approvals
Air surveillance• Detection of non-emitting & LPI-targets• Long range border/coastal surveillance• Near-range high precision slow & low
target tracking• Camp&eventprotection,e.g.G8sum-
mit, sports events, ...• AirTrafficManagement/Lowcost airfieldradarperformance
• High building & infrastructure signal lighting control
Sea and ground surveillance• Harbour awareness & protection without
interference• Ship self-protection• Border protection
TwInvis Functional Capabilities
• ExploitingFM/DAB/DVB-T simultaneously
• 360° azimuth coverage, 3D track • RangeFMupto250km,300-500m
accuracy• Range DAB / DVB-T up to 100 km,
50-100 m accuracy• Real time fusion of -16FMtransmitters, - 5 Single Frequency Networks out of
DAB and DVB-T• Sensor cluster with up to 15 sensors• Antenna-to-track delay: <1,5s • Track update rate <0,5 seconds• RemoteASTERIXdatalinktoCRCs
Operational Advantages
• No emissions (no active transmitters, in-visibletoradarsearch,jammerresistant)
• No electro-magnetic pollution (use in urbanareas)
• Trackingofhighlyagileobjects• Weather independent• Multi-angletargetdetection(Compensat-ingunfavorablemonostaticgeometries)
• Detection of low altitude targets by affordable placements in white spots
Other Advantages
• Low cost procurement & maintenance (no turning parts, no transmitter needed, COTScomputers)
• Easy deployment, light weight • Operationindifficultterrain• Thanks to low cost sensors a network performance(cluster)withmultiple sensors is easily installed
• Remote, stand-alone operation
TwInvis placementTwInvis uses several transmission sources from various locations. It also can interconnect several sensors into a sensor cluster. Such transmitters and TwInvis sensors can be separated from each other by some km up to more than 100 km.
What frequencies does passive radar use?FM – Supports detection of larger aircraft at a distance of up to 250 km
DAB/DVB-T – Up to approxi-mately 100 km, small aircraft can be tracked with an error margin of appr. 50 to 100 m
Flying object located
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from different transmitters are reflected by the radar and analysed without being detected.
The first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Bistatic distance
Vehicle(e.g., Wolf)
Antenna height up to 13 m
Antenna
Detection using interaural time difference
ApplicationPassive radar uses many different transmission sources that are sent out from various locations to determine the position of flying objects. This enables it to locate stealth aircraft that cannot be detected using active systems.
What frequencies does passive radar use?
FM – Supports detection of larger aircraft at a distance of up to 250km
DAB/DVB-T – Up to approximately 100km, small aircraft can be tracked with an error margin of appr. 50 to 100m
Normal distance
Transmitter Receiver
Ellipsoidal fields
Radio transmitters
Receiver
TV transmitters
Event that needs protection
Different types of radar detectionMobile Option
Flying object located
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from different transmitters are reflected by the radar and analysed without being detected.
The first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Bistatic distance
Vehicle(e.g., Wolf)
Antenna height up to 13 m
Antenna
Detection using interaural time difference
ApplicationPassive radar uses many different transmission sources that are sent out from various locations to determine the position of flying objects. This enables it to locate stealth aircraft that cannot be detected using active systems.
What frequencies does passive radar use?
FM – Supports detection of larger aircraft at a distance of up to 250km
DAB/DVB-T – Up to approximately 100km, small aircraft can be tracked with an error margin of appr. 50 to 100m
Normal distance
Transmitter Receiver
Ellipsoidal fields
Radio transmitters
Receiver
TV transmitters
Event that needs protection
Different types of radar detectionMobile Option
Flying object located
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from different transmitters are reflected by the radar and analysed without being detected.
The first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Bistatic distance
Vehicle(e.g., Wolf)
Antenna height up to 13 m
Antenna
Detection using interaural time difference
ApplicationPassive radar uses many different transmission sources that are sent out from various locations to determine the position of flying objects. This enables it to locate stealth aircraft that cannot be detected using active systems.
What frequencies does passive radar use?
FM – Supports detection of larger aircraft at a distance of up to 250km
DAB/DVB-T – Up to approximately 100km, small aircraft can be tracked with an error margin of appr. 50 to 100m
Normal distance
Transmitter Receiver
Ellipsoidal fields
Radio transmitters
Receiver
TV transmitters
Event that needs protection
Different types of radar detectionMobile Option
Flying object located
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from different transmitters are reflected by the radar and analysed without being detected.
The first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Bistatic distance
Vehicle(e.g., Wolf)
Antenna height up to 13 m
Antenna
Detection using interaural time difference
ApplicationPassive radar uses many different transmission sources that are sent out from various locations to determine the position of flying objects. This enables it to locate stealth aircraft that cannot be detected using active systems.
What frequencies does passive radar use?
FM – Supports detection of larger aircraft at a distance of up to 250km
DAB/DVB-T – Up to approximately 100km, small aircraft can be tracked with an error margin of appr. 50 to 100m
Normal distance
Transmitter Receiver
Ellipsoidal fields
Radio transmitters
Receiver
TV transmitters
Event that needs protection
Different types of radar detectionMobile Option Different types of radar detection
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from differ-ent transmitters are reflected by the radar and analysed without being detected.
Detection using interaural time difference
Flying object located
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from different transmitters are reflected by the radar and analysed without being detected.
The first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Bistatic distance
Vehicle(e.g., Wolf)
Antenna height up to 13 m
Antenna
Detection using interaural time difference
ApplicationPassive radar uses many different transmission sources that are sent out from various locations to determine the position of flying objects. This enables it to locate stealth aircraft that cannot be detected using active systems.
What frequencies does passive radar use?
FM – Supports detection of larger aircraft at a distance of up to 250km
DAB/DVB-T – Up to approximately 100km, small aircraft can be tracked with an error margin of appr. 50 to 100m
Normal distance
Transmitter Receiver
Ellipsoidal fields
Radio transmitters
Receiver
TV transmitters
Event that needs protection
Different types of radar detectionMobile Option
Bistatic distance
Normal distance
Transmitter ReceiverThe first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Ellipsoidal fields
Radio transmitters TV transmitters
Receiver
Flying object located
Event that needs protection
Flying object located
ActiveThe radar transmits signals and receives reflections. This is how it can be located.
PassiveLow radio frequencies from different transmitters are reflected by the radar and analysed without being detected.
The first information on the possible position of the object to be located is obtained with a transmitter-receiver.
Bistatic distance
Vehicle(e.g., Wolf)
Typical antenna height 6 m
Detection using interaural time difference
ApplicationPassive radar uses many different transmission sources that are sent out from various locations to determine the position of flying objects. This enables it to locate stealth aircraft that cannot be detected using active systems.
What frequencies does passive radar use?
FM – Supports detection of larger aircraft at a distance of up to 250km
DAB/DVB-T – Up to approximately 100km, small aircraft can be tracked with an error margin of appr. 50 to 100m
Normal distance
Transmitter Receiver
Ellipsoidal fields
Radio transmitters
Receiver
TV transmitters
Event that needs protection
Different types of radar detectionMobile OptionMobile Option
Typical antenna height 6 m
Vehicle (e.g. Wolf)
