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Radio observatories and quiet zonesThe sky, kept quiet enough to hear.
Radio telescopes listen for signals far weaker than any phone. Every transmitter near the site, every faulty device and every satellite passing over can drown the sky. Interference monitoring across the quiet zone, with site weather and precise timing, tells astronomers what to trust and regulators what to find.
Plan a deploymentHow it worksStation Builder- Industry
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- Sources cited
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Research · Radio observatories and quiet zones
Signals fainter than any phone
Radio telescopes listen for signals far weaker than any phone, so every transmitter near the site, faulty device or passing satellite can drown the sky. Quiet zones protect major observatories, and international criteria say how much interference is too much. Measuring it is how both are enforced.
What is measured
The spectrum, the weather and time
Wideband receivers at the array and around the quiet zone sweep the radio spectrum continuously. Weather stations measure the water vapour that limits high-frequency observing, and timing receivers keep the site clocks that interferometry depends on. Every instrument keeps its calibration and position with the site record.
- Instruments
- Interference monitors · Weather stations · Timing receivers
The base node
Sky or transmitter
The processing node compares each sweep with the protection criteria, flags events, estimates their direction and identifies known satellite passes. It tags every observation with the interference present, so astronomers know what in their data is the sky. Every value is signed at the node before it leaves.
Radio and links
Nothing that transmits
Inside the quiet zone nothing may transmit, so every monitor reaches the observatory over fibre. Mobile monitoring vans used to track sources report over cellular only from outside the zone boundary. When one path fails, the other carries the data.
- Links
- Fibre · Public cellular outside the zone
How it works
From a spike to a silenced source
A strong signal appears in a protected band every evening. Monitors at three points estimate its direction toward a farm inside the zone. The regulator visits and finds a faulty device; it is replaced, the band is clean again and the event is closed in the database.
From order to operation · Order
Scope the zone and the bands
The scope reads the observatory’s bands, its quiet zone rules, past interference and the regulator’s enforcement process. Nexus Observatory Inc. returns the monitor plan, processing design, interference database and a price per site and per year. The scope is agreed before any site work begins.
Plan a deploymentFrom order to operation · Survey
Survey the radio environment
Crews survey the site and zone with a portable receiver: existing interference, candidate monitor sites with views across the zone, fibre routes and shielded rooms. Findings are recorded with spectra and directions. Findings shape the kit for each site before anything is built.
From order to operation · Permits
Regulator and site rules
The spectrum regulator agrees how monitoring supports enforcement in the quiet zone, the observatory approves every installation for its own emissions, and land owners approve remote monitors. Every approval is kept with the site record. No crew goes to site before its approvals are in place.
From order to operation · Build
Build quiet
Receivers, antennas and nodes are built and tested in a shielded chamber so they add no interference, calibrated across the bands, enrolled with their identities and run together before shipping. Nothing ships until the whole kit has passed its tests together.
Open the Station BuilderFrom order to operation · Install
Install with fibre
Crews mount monitor antennas, install receivers and nodes in shielded enclosures, lay or connect fibre and verify the installation adds nothing to the spectrum. Every monitor is photographed and recorded. Crews follow the site safety plan throughout the work. The site record is updated before the crew leaves.
From order to operation · Commission
Commission against known sources
Each node proves its identity and time. Known test signals and satellite passes are detected and located, sweeps are compared with a reference receiver, and interference tags are checked against observers’ own data. Acceptance is recorded with the owner before handover.
From order to operation · Operate
Tag and find interference
Observers see the interference present during every observation; the observatory’s spectrum manager sees events and directions; regulators receive evidence to find and stop sources inside the zone. Every alert and action is kept on the record. Reports for owners and funders come from the same record.
From order to operation · Maintain
Keep the monitors quiet
Monitors are checked for their own emissions, recalibrated on the agreed plan, and updated over fibre in rings. The interference database keeps every event, so trends and sources are visible over years. Maintenance history stays with each site for its whole life.
Book field servicesData products
For astronomers and regulators
Astronomers receive interference tags on their observations; observatory spectrum managers receive events and directions; spectrum regulators receive enforcement evidence; array operators receive site weather and timing, each tied to time, frequency and place. Every product can be traced back to its readings.
See the data productsEvidence
Criteria the sky needs
Interference is measured against the international protection criteria for radio astronomical measurements and the radio astronomy provisions of the Radio Regulations. Every sweep and event is kept, so observers, observatories and regulators share one record. The record is kept for as long as the duty lasts.
- Drawn against
- Recommendation ITU-R RA.769 · ITU Radio Regulations, Article 29
What you get
Spectrum and RF monitoring
RF sensing in the band for interference, coexistence and spectrum planning. Delivered as managed service and data licence, for carriers, regulators, airports, venues. Scale: Regional. Service levels are written as numbers you can measure on your own dashboard. The same design repeats from the first site to the last.
Talk to salesNext step
Plan radio observatories and quiet zones with us
Tell us the site, the measurements and the rules it answers to. We reply with a survey proposal, a design and a scope for radio observatories and quiet zones. An engineer replies with a survey proposal and a scope, and the plan grows from one site to the network you need, at your pace.
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01The place and its hazards
Where it runs, and what can go wrong.
Operating contextRadio astronomy has protection criteria set by the international recommendation for radio astronomical measurements, bands allocated under the Radio Regulations, and in many countries a radio quiet zone around major observatories. Interference must be measured to show where criteria are exceeded and to find its sources.
Hazards
- Transmitters and devices inside the quiet zone
- Satellites passing through the beam
- Faulty electronics on the site itself
- Weather that degrades observations at high frequencies
- Timing errors that corrupt interferometry
02What must be measured
What, where, how often, and under which rules.
Each measurement names where it is taken, how often, and the public standard or regulation behind it. Numbers in the sources column open the cited source below.
| Measurement | Where | Cadence | Sources |
|---|---|---|---|
| Interference across the radio spectrum | Monitoring receivers at the site and around the quiet zone | Continuous sweeps | 12 |
| Site weather and precipitable water | Weather stations at the array | Every minute | 3 |
| Time and frequency reference | Timing receivers and site clocks | Continuous | 1 |
| Interference events and sources | Every detected event and its direction | Every event | 2 |
03The observation stack
From one base unit to a network.
The same blocks at every scale: instruments and a base node, a site with its radio, a fleet run as one, and a network federated on the open protocol.
- 01
Base unit
A monitor: a wideband interference receiver and antenna with weather sensors and a timing receiver on a processing node.
Build a station → - 02
Site
A site: monitors at the array and around the quiet zone, linked by fibre to the observatory.
Plan a site → - 03
Fleet
An observatory’s monitors processed as one, with an interference database for observers and regulators.
Managed offers → - 04
Network
Observatories share interference records with spectrum regulators and other observatories.
The open protocol →
- 01Compact weather station
- 02GNSS reference station (RTK)
- 03GPU edge server
- 04Fibre terminal
- 05Shelter
Radio and links
Fibre
Inside the quiet zone, nothing transmits: every monitor reaches the observatory over fibre.
Radio and links
Public cellular
Mobile monitoring vans report over cellular only from outside the zone boundary.
Edge computeThe processing node sweeps the spectrum, compares it with the protection criteria, flags events, estimates direction and identifies known satellite passes, and tags observations with the interference present.
PowerMains from the observatory with conditioned, shielded power, so the monitoring itself adds no interference.
04How it works
From the instrument to the product.
One observation’s path, tier by tier, with the interface on every link and a bill of materials below; then how the one node grows to a site, a fleet and federated networks.
Radio observatories and quiet zones: data path
– of 06
01 Instruments Measurement with sensor identity andcalibration 02 Node – Wrap in an observation envelope with timequality– Measure quality and uncertainty, attachquality flags– Buffer locally (store-and-forward when thelink drops) 03 Backhaul Commit with transactional outbox andpublish, delivered at least once 04 Site Consumer inbox deduplicates and applieseach record once into governed data 05 Data store Governed product through API, map orexport, correction-aware 06 Products VITA 49SigMFMQTT 07 Power and structure Wideband interference monitoringreceiver and antenna Not in the reference kit 01 Compact weather station SDI-12 · RS-485 · Ethernet 02 GNSS reference station (RTK) Ethernet · GNSS antenna · RS-232 ·1PPS/10 MHz 03 GPU edge server Ethernet · Fibre · PCIe · BMC ·1PPS/10 MHz 04 Fibre terminal Fibre · Ethernet Site MQTT 5 with Sparkplug B Governed data store Versioned, correction-aware Interference tags on observations Interference events and directions Enforcement evidence Site weather and timing 05 Shelter Ethernet Ethernet · MQTT 5 1PPS/10 MHz Fibre Fibre| Item | Equipment | Data ports | Protocols | Power in |
|---|---|---|---|---|
| 01 | Compact weather stationAll-in-one or compact station for temperature, humidity, pressure, wind and rain at a site. | SDI-12RS-485Ethernet | SDI-12, Modbus, MQTT 5, OGC SensorThings API | 12 V DC |
| 02 | GNSS reference station (RTK)Multi-constellation GNSS base station that streams corrections for real-time kinematic positioning. | EthernetGNSS antennaRS-2321PPS/10 MHz | NMEA 0183, NTP with NTS | 12 V DC |
| 03 | GPU edge serverShort-depth server with one or more accelerator modules for inference, training and AI-RAN shared compute at the edge. | EthernetFibrePCIeBMC1PPS/10 MHz | DMTF Redfish, IEEE 1588 PTP, MQTT 5 | AC mains, 48 V DC |
| 04 | Fibre terminalOptical network terminal or media converter that lands fibre backhaul at a site. | FibreEthernet | IEEE 1588 PTP | 12 V DC, 48 V DC, AC mains |
| 05 | ShelterWalk-in shelter or container with HVAC, fire detection and power distribution. | — | — | — |
How it scales
01 Instruments Arbitrary qualified sensors and instruments whosemeasurements are ingested with calibration, units,geometry, time, custody and uncertainty. ×n 02 Node The minimum useful deployable unit: server, ruggedappliance, radio node, sensor gateway, satelliteterminal, AI, scientific, vehicle or virtual node. Node Node agent 03 Site The minimum independently operable localgovernance and failure domain: one or more nodesplus local network, identity, policy, evidence,storage, products and operator surfaces.SITE
Node Node Node ×n 04 Cluster An optional scale or specialisation domain forscheduling, shared storage, accelerators or datalocality.CLUSTER
×n 05 Fleet Coordinates plans, acknowledgements,convergence evidence, update campaigns andcorrection propagation across nodes and sites.FLEET
Fleet controller ×n 06 Federation An exchange of products, capabilities, events orwork across approved, independently administeredtrust domains, using explicit trust, policy,data-locality, version and correction contracts.TRUST DOMAIN
TRUST DOMAIN
TRUST DOMAIN
×n Verifier Applications Data in the field Telemetry Control Data upstream Control Data upstream Control Exchange Evidence Events Exchange- Data in the field
- MQTT 5 with Sparkplug B; connectors for LoRaWAN, OPC UA and instrument buses.
- Telemetry
- OpenTelemetry OTLP.
- Control
- TLS 1.3 with mutual authentication; protobuf messages over gRPC or HTTP/2.
- Data upstream
- At-least-once publication with repeat-safe keys over the control channel or NATS JetStream; QUIC MAY be used on lossy links.
- Evidence
- DSSE-signed in-toto statements; SLSA provenance; SCITT transparency receipts.
- Events
- Event envelopes mapped to CloudEvents 1.0; channels described in AsyncAPI 3.
- Exchange
- OpenAPI 3.1; the OGC API family; SensorThings; STAC; WIS 2.0.
05From order to operation
Every step, from the first call to a running site.
The same crew and the same record carry the work from scope to maintenance.
- 01 Order
Scope the zone and the bands
The scope reads the observatory’s bands, its quiet zone rules, past interference and the regulator’s enforcement process. Nexus Observatory Inc. returns the monitor plan, processing design, interference database and a price per site and per year. The scope is agreed before any site work begins. 2
- 02 Survey
Survey the radio environment
Crews survey the site and zone with a portable receiver: existing interference, candidate monitor sites with views across the zone, fibre routes and shielded rooms. Findings are recorded with spectra and directions. Findings shape the kit for each site before anything is built. 1
- 03 Permits
Regulator and site rules
The spectrum regulator agrees how monitoring supports enforcement in the quiet zone, the observatory approves every installation for its own emissions, and land owners approve remote monitors. Every approval is kept with the site record. No crew goes to site before its approvals are in place.
- 04 Build
Build quiet
Receivers, antennas and nodes are built and tested in a shielded chamber so they add no interference, calibrated across the bands, enrolled with their identities and run together before shipping. Nothing ships until the whole kit has passed its tests together.
- 05 Install
Install with fibre
Crews mount monitor antennas, install receivers and nodes in shielded enclosures, lay or connect fibre and verify the installation adds nothing to the spectrum. Every monitor is photographed and recorded. Crews follow the site safety plan throughout the work. The site record is updated before the crew leaves.
- 06 Commission
Commission against known sources
Each node proves its identity and time. Known test signals and satellite passes are detected and located, sweeps are compared with a reference receiver, and interference tags are checked against observers’ own data. Acceptance is recorded with the owner before handover. 1
- 07 Operate
Tag and find interference
Observers see the interference present during every observation; the observatory’s spectrum manager sees events and directions; regulators receive evidence to find and stop sources inside the zone. Every alert and action is kept on the record. Reports for owners and funders come from the same record. 2
- 08 Maintain
Keep the monitors quiet
Monitors are checked for their own emissions, recalibrated on the agreed plan, and updated over fibre in rings. The interference database keeps every event, so trends and sources are visible over years. Maintenance history stays with each site for its whole life.
06Data products and integration
What it delivers, to whom, and into which systems.
Data products
- Interference tags on observationsAstronomers
- Interference events and directionsObservatory spectrum managers
- Enforcement evidenceSpectrum regulators
- Site weather and timingOperators of the array
Integration
- Observatory systemsTags join observation metadata in the observatory’s archive.
- RegulatorEvidence is exported in the regulator’s format.
- SchedulingWeather and interference feed observation scheduling.
Exchanged through VITA 49, SigMF, MQTT.
07Questions buyers ask
Before you scope it.
Does monitoring add interference?
No. Equipment is shielded and tested in a chamber before installation.
Can it find a source?
It estimates direction; the regulator investigates.
Does it track satellites?
Known passes are identified and tagged.
Can astronomers flag data?
Every observation carries its interference tags.
08Resources
The sources behind this page.
Public standards, regulations and guidance, cited where they apply. Each applies only where its jurisdiction or scope does.
- 1Recommendation ITU-R RA.769: Protection criteria used for radio astronomical measurementsInternational Telecommunication Union
- 2ITU Radio Regulations, Article 29: Radio astronomy serviceInternational Telecommunication Union
- 3WMO-No. 8: Guide to Instruments and Methods of ObservationWorld Meteorological Organization
09Related
Use cases and solutions.
SolutionSpectrum and RF monitoring
RF sensing in the band for interference, coexistence and spectrum planning.Solutions for research →SolutionResearch site and instrument services
Site power, connectivity, timing and operations for telescopes, flux towers and research stations.Solutions for research →SolutionTiming and positioning integrity
PTP grandmasters with GNSS holdover, interference detection and timing monitoring for networks and instruments.Solutions for research →10Research: specialized fields
Other fields of this industry.
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Seismic, magnetic, gravity and GNSS observatories in quiet vaults, run to the standards of the international data centres so their decades-long records are trusted worldwide.The full field →Bring us the site.
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