01
Precise, not approximate
CRPC protocol-cracking resolves individual airframes of the same brand, same model, same band — and tags each by body ID. You strike the one drone that matters and leave the rest of the sky untouched.
Low-Altitude Security Systems · Hangzhou, China
Detect. Identify. Defeat.
A full-spectrum counter-UAS portfolio — passive RF detection, CRPC precise identification, TDOA+ networked positioning, narrowband precision jamming and navigation spoofing. 30 MHz–6 GHz. 10 km. 900+ airframes.
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IWho we are
Founded in 2006. Headquartered in Hangzhou. Built for the airspace below 1,000 metres.
Iron Stone (Hangzhou) Emergency Safety Technology Co., Ltd. is an integrated technology enterprise working across low-altitude infrastructure, low-altitude security and low-altitude applications — turning safety assurance into the foundation for compliant, efficient use of low-altitude airspace.
- Vice-Chair UnitZhejiang Provincial Public Security Low-Altitude Safety Management Association
- MemberChina Civil Airport Association
- Level IIConfidentiality qualification, weapons & equipment R&D and production
- Listed EnterpriseEastern Theatre high-potential enterprise catalogue, Doc. 2025-893
IICapability envelope
Four numbers that define the perimeter
0km
Detection radius
Maximum passive detection radius on the TS-I and A-D Pro stationary sensors, subject to deployment environment and target airframe.
0GHz
Spectrum ceiling
Continuous 30 MHz–6 GHz sweep across every band commercial, DIY and FPV airframes operate in.
0+
Airframes in library
Mainstream brands, DIY builds and FPV racers — with lifetime library maintenance and live updates.
0°
Direction-finding accuracy
≤3° RMS single-station bearing accuracy, with AOA + TDOA networking for regional positioning.
IIIThree reasons to choose Iron Stone
02
Passive, therefore invisible
Detection receives only. No emission, no electromagnetic signature, no radiation — the sensor cannot be located, and it cannot interfere with the airport, grid or petrochemical plant it protects.
03
One doctrine, every form factor
Fixed, vehicle-mounted, portable, handheld and wrist-worn share a single command fabric. Each device stands alone; networked, they close the gaps that terrain and interference open.
IVCore technology
CRPC + TDOA+ — detect it accurately, then hold it
Conventional RF geolocation relies on TDOA (time difference of arrival) across three or more stations, or AOA (angle of arrival) across two or more. Iron Stone fuses both with CRPC protocol analysis, collapsing identification, positioning and engagement into one loop.
CRPC
Cognitive radio protocol cracking
Reverse-parses the drone's own downlink to extract navigation and telemetry data. A single station resolves navigation-grade position for non-cooperative, multi-brand airframes — no triangulation required.
TDOA+
Fused time-difference positioning
CRPC identity layered onto a TDOA mesh. Multi-station grids deliver ≤10 m RMS positioning across the protected region, with AOA cross-bearings closing gaps.
RID
Full-standard Remote ID
Cooperative traffic decoded against GB 42590-2023, ASTM F3411-22a and ASD-STAN prEN 4709-002 — Wi-Fi and Bluetooth, ≤10 ms latency.
STRIKE
Narrowband low-power precision
Engage any one — or several — of a multi-drone incursion while every other airframe, and every friendly radio service nearby, continues unaffected.
SPOOF
Multi-constellation navigation deception
Milliwatt-class simulated GNSS out-competes the live constellation inside a controllable 0.5–1 km sphere. No spark risk, no radiation hazard, ≥10 targets at once.
VProduct system
Five series. Twenty‑one platforms.
From a 550 g handheld to a 10 km fixed sensor mast — select a series to open its platforms.
VIFlagship platforms
Specification rail
VIIDeployment doctrine
Layered defence, not a single fence
A fixed detect-and-defeat platform is sited at the high point of the protected core, establishing a clear-airspace protection zone of 3–5 km radius. Vehicle, portable and handheld units are attached to the periphery, forming successive lines. Every device operates independently or as a node — eliminating the blind spots that obstruction and interference create.
Periphery
Outer
Core
PROTECTED ASSET
- Core3–5 km clear-airspace zone. Fixed detect-and-defeat platform sited at the high point of the protected core.
- OuterVehicle-mounted patrol, repositioning to cover terrain the fixed sensor cannot see.
- PeripheryHandheld and portable units attached to the outer line for dismounted response.
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Non-cooperative target Unregistered micro, light and small UAS, tracked by direct sensor measurement alone. On reaching the periphery the nearest platform engages automatically — designated, struck, brought down.
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Cooperative target Broadcasting identification per the Interim Regulations on UAS Flight Management. Whitelisted airframes operate freely inside the outer ring, without alarm — and are held out of the protected core.
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Networked or standalone Three or more platforms hold the periphery — here a fixed TS-I mast with TS-UC II vehicle-mounted and TS-V2 handheld units patrolling around it. Each completes the full loop alone; meshed, they share bearings and TDOA solutions across the site.
VIIIWhere it is deployed
Sixteen mission environments
IXNext step
Tell us what you need to protect.
Site survey, threat modelling, coverage simulation and a deployment plan matched to your terrain — fixed, mobile or dismounted. Flexible commercial models including direct procurement, lease and evaluation trial.