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GNSS Monitoring System

An all-in-one, all-constellation GNSS receiver for millimetre-level 3D surface-displacement monitoring. BeiDou short-message keeps remote sites reporting even where there is no cellular network at all.

SCIS-GNSS-100 · ALL-CONSTELLATION · MM-LEVEL

SCIS-GNSS-100 GNSS monitoring station with mushroom dome antenna and solar panels

Overview

Millimetre-level displacement, anywhere the sky is open

The SCIS-GNSS-100 pairs a base station on stable bedrock with rover stations on the deformation body. RTK double-difference carrier-phase processing cancels clock and atmospheric errors, then fixes integer ambiguities to deliver millimetre-level 3D displacement in real time — around the clock, in any weather, with no line of sight required between points.

✓
All-constellation, BDS-3 triple-frequency
Tracks GPS, GLONASS, Galileo and BDS-3; B1C/B2a/B3I triple-frequency cancels first-order ionospheric error, holding mm-level accuracy on baselines up to 30 km.
✓
BeiDou short-message for no-network sites
Where there is no cellular coverage, monitoring data returns via BeiDou short message — ideal for slopes deep in remote mountains.
✓
Low-power all-in-one
Receiver, antenna and comms in one sealed unit drawing under 1.2 W — a small solar panel keeps it running, plug-and-play.
✓
Kalman + sidereal-day filtering
The AI layer denoises with Kalman and sidereal-day filtering, suppressing repeating multipath errors and pushing long-term noise to 1–2 mm.

±2.5 mm

Static Accuracy (+0.5 ppm)

<1.2 W

Power Consumption

Constellations Tracked

30 km

mm-Level Baseline (BDS-3)

Working principle

RTK Double-Difference: How Millimetres Emerge From Space

A base station on stable bedrock and a rover on the monitored structure observe the carrier phase of the same satellites. Differencing across the two receivers and across two satellites cancels the dominant error sources — what remains is pure geometry plus an integer ambiguity that, once fixed, unlocks millimetre-level relative displacement.

Double-difference geometry: receiver-pair and satellite-pair differencing leaves only the baseline geometry and the integer ambiguity N.

Difference Twice

Differencing the carrier phase between the two receivers and between two satellites cancels receiver clock error, satellite clock error and most of the atmospheric delay — the errors never need to be measured, only cancelled.

Fix the Ambiguity

The remaining unknown is the integer number of carrier wavelengths. The LAMBDA algorithm resolves it to whole numbers within 1–60 s — the "fixed solution" — at which point positioning enters the millimetre regime. Corrections stream from base to rover as standard RTCM 3.x.

Average Down the Noise

Short-baseline RTK delivers ±8 mm + 1 ppm horizontal and ±15 mm + 1 ppm vertical; for long-term monitoring, minute-level epoch averaging compresses the noise floor to 1–2 mm.

Specifications

SCIS-GNSS-100 Technical Specifications

RTCM 3.x standard corrections, four communication options plus BeiDou short message, and a power budget small enough for a single solar panel.

Parameter	SCIS-GNSS-100
Constellations	GPS / GLONASS / Galileo / BDS-3
Static accuracy	±2.5 mm + 0.5 ppm
Dynamic accuracy (RTK)	±8 mm + 1 ppm horizontal · ±15 mm + 1 ppm vertical
Long-term monitoring noise	1–2 mm with epoch averaging
Correction protocol	RTCM 3.x
Communication	4G / NB-IoT / LoRa / UHF + BeiDou short message
Denoising	Kalman + sidereal-day filtering
Power supply	DC 12–36 V, solar / mains
Power consumption	< 1.2 W

Deployed the Right Way, So the Data Can Be Trusted

Base Station on Stable Bedrock

The base sits on known, stable ground and is verified by periodic static comparison — if the reference moves, every reading is suspect.

Clear 15° Horizon

Obstructions are kept below a 15° elevation angle to maximize visible satellites; rigid antenna mounts keep self-vibration out of the data.

Dual Links + Quality Flags

4G primary with UHF backup; the cloud flags any station whose fixed-solution rate drops below 80% for review before issuing an alert.

Benchmarked

All-In-One Design vs. Imported-Module Receivers

Many monitoring receivers on the market are built around third-party OEM modules — which shows up as complex setup, higher power draw and higher cost. The SCIS-GNSS-100 takes a different route: a fully in-house technology stack in one sealed unit.

Dimension	SoilCreate SCIS-GNSS-100	Imported-module receivers
Core technology	Fully in-house technology stack	Built around imported OEM modules
Commissioning	All-in-one, plug-and-play	Complex setup and configuration
No-network sites	BeiDou short-message fallback	Cellular only — data gaps
Power draw	< 1.2 W — small solar panel	Higher draw, larger solar arrays
Total cost	High-value system pricing	Varies by module and service scope

Installation

Site Installation: Geometry and Links First

GNSS monitoring accuracy is decided as much by where and how stations are installed as by the receiver itself. Five field rules from the installation manual.

1
Plan the baseline length first
Under 10 km is the RTK comfort zone. At 10–30 km, mid-baseline parameters need adjustment; beyond 30 km, upgrade to PPP or a multi-base-station network.
2
Mount the rover rigidly
The rover antenna connects rigidly to the monitored foundation — typically a concrete pier or steel frame. A flexible mount lets the antenna's own vibration enter the displacement data.
3
Run dual communication links
4G as the primary link with UHF as redundant backup. A 4G-only setup in mountainous or below-grade terrain is prone to data loss.
4
Size the power with margin
Solar systems are sized for 7 days of overcast plus a 30% safety reserve. With mains power, plan for outages — the often-overlooked failure mode.
5
Inspect link quality weekly
4G signal quality at urban fringes degrades over time. A weekly link-quality check keeps RTK from silently degrading toward single-point positioning.

GNSS monitoring station installed on a slope, overlooking the valley

GNSS monitoring station on a concrete pier with solar panels — Rover station on a concrete pier — rigid mounting with solar supply

GNSS monitoring station deployed beside a cut slope — Slope-site deployment with open sky above the 15° elevation mask

Underside of the all-in-one GNSS receiver showing mounting and connector interfaces — All-in-one receiver underside: mounting and connector interfaces

Applications

Where the SCIS-GNSS-100 Earns Its Keep

Continuous, unattended surface-displacement monitoring — from unstaffed mountain slopes to dam crests and long-span bridges.

Geohazard

Slopes & Landslides in Remote Mountains

Solar power plus BeiDou short-message suit unattended sites far beyond cellular coverage; pairs with flexible inclinometers and water level gauges as a standardized geohazard early-warning kit.

Hydropower

Dam Crest Deformation

Continuous 3D displacement of the dam crest and abutments; sidereal-day filtering separates true movement from repeating multipath, supporting long-term trend analysis.

Bridge

Bridge Towers & Main Girders

Tracks tower tilt and girder deformation through wind, temperature and traffic loading — all-weather, day and night, with no line of sight required.

FAQ

Frequently Asked Questions

Our site has no cellular network at all. Can it still report?

Yes. The SCIS-GNSS-100 supports BeiDou short message in addition to 4G / NB-IoT / LoRa / UHF, so monitoring data returns via satellite where there is no cellular coverage — the typical case for slopes deep in remote mountains.

How long can the baseline between base and rover be?

Under 10 km is the RTK comfort zone. From 10–30 km, mid-baseline parameters need adjustment; beyond 30 km, the system should move to PPP or a multi-base-station network. With BDS-3 B1C/B2a/B3I triple-frequency, the first-order ionospheric error cancels in hardware and millimetre-level accuracy holds out to 30 km on a single baseline.

What is a "fixed solution", and why does its rate matter?

A fixed solution means the carrier-phase integer ambiguity has been resolved to whole numbers — the precondition for millimetre-level output. If the link degrades and RTK falls back toward single-point positioning, accuracy drops from millimetres to metres and can masquerade as a sudden "displacement jump". That is why the platform tracks the fixed-solution rate separately: a station below 80% is flagged for link review, and a sub-80% rate is never used as the sole basis for a deformation conclusion — it is cross-validated with hydrostatic levelling, tilt and other measurements.

The station sees few satellites or the fixed rate is low. What do I check?

Few satellites usually means obstructions inside the 15° elevation mask — relocate the antenna. A persistently low fixed rate often points to multipath from nearby reflective surfaces — fit a choke-ring (anti-multipath) antenna. If RTK will not converge at all, the 4G/LoRa link is the usual suspect: switch links. A long-term slow drift in the data calls for a static comparison of the base station itself.

How long can a station run on solar power alone?

The receiver draws under 1.2 W, and solar systems are sized to the field rule of 7 days of continuous overcast plus a 30% safety reserve — so a small panel sustains unattended operation through extended bad weather.