TDXL-CA341 3D choke ring GNSS survey antenna mounted on a geodetic tripod

High-Precision Measurement

High-Precision GNSS Measurement Antennas

Multi-frequency GNSS antennas engineered for geodetic survey, RTK rovers, and permanent CORS reference stations. From compact 16-gram helical designs to our flagship TDXL-CA341 3D choke ring with sub-millimeter phase center accuracy.

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Application Overview

Why Measurement-Grade Antennas Matter

High-precision GNSS positioning demands antennas with exceptional phase center stability, superior multipath rejection, and consistent performance across all satellite constellations. Whether building a permanent CORS reference station, deploying an RTK rover, or monitoring structural deformation, antenna quality directly determines your positioning accuracy.

GNSource measurement antennas span the full spectrum — from compact 16-gram helical designs optimized for portable RTK receivers, to our flagship TDXL-CA341 3D choke ring antenna with sub-millimeter phase center accuracy for the most demanding geodetic applications. Every model supports multi-constellation, multi-frequency reception across BDS, GPS, GLONASS, and Galileo.

Engineered to withstand long-term outdoor deployment — IP67 waterproofing, salt spray tested, lightning protection to 1KV on timing variants, and MTBF exceeding 30,000 hours on the flagship choke ring.

Key Specifications to Consider

  • Phase Center Stability

    Sub-millimeter repeatability determines final positioning accuracy.

  • Multipath Rejection

    Critical for urban and reflective environments.

  • Gain Pattern Symmetry

    Ensures consistent tracking across satellite elevations.

  • LNA Noise Figure

    Lower figures improve low-elevation satellite acquisition.

  • Multi-Constellation Bands

    Broader coverage reduces outages and improves redundancy.

Product Catalog

Measurement Antenna Models

24 models in this category. Click Request Quote on any row to pre-fill the inquiry form.

TDXL-CA341

3D Choke Ring

TDXL-CA341
Frequencies
BDS B1/B2/B3, GPS L1/L2/L5, GLONASS G1/G2, Galileo full + L-Band
Key Specs
Phase center ±1mm · 7dBi gain · 46dB LNA · MTBF 30,000h
Form Factor
Ø380mm · 10kg · N-type

TDXL-900M

Full-band Helical

TDXL-900M
Frequencies
BDS B1/B2/B3, GPS L1/L2/L5, GLONASS G1/G2, Galileo + SBAS L-Band
Key Specs
Phase center ±5mm · 34dB LNA · IP67 · Axial ratio ≤3dB
Form Factor
Ø23mm × 56mm · 16g · SMA-J

TDXL-800M

Multi-freq Helical

Frequencies
BDS B1/B2/B3, GPS L1/L2/L5, GLONASS G1/G2, Galileo E1/E5b
Key Specs
34dB LNA · IP67 · Phase center ±5mm · NF ≤1.5dB
Form Factor
Ø23mm × 56mm · 16g · SMA-J

TDXL-802M

BDS-focused Helical

Frequencies
BDS B1I/B3I/B1C/B2a/B2b, GPS L1/L2/L5, GLONASS, Galileo
Key Specs
8-arm coupling · 4-point feed · Axial ratio ≤2dB · IP67
Form Factor
Ø23mm × 56mm · 16g · SMA-J

TDXL-GGBR8I05

Full-band Helical

Frequencies
BDS B1/B2/B3, GPS L1/L2/L5, GLONASS G1/G2, Galileo + L-Band
Key Specs
34dB LNA · Max gain ≥2dBi · Axial ratio ≤3dB
Form Factor
Ø27.5mm × 56mm · 18g · SMA-J

TDXL-GGBR7I04

Built-in Helical

Frequencies
BDS/GPS/GLONASS/Galileo/SBAS/QZSS (full constellation)
Key Specs
IPEX gen1 connector · Ground-segmentation tech · 34dB LNA
Form Factor
32mm × 44.8mm · 6g · IPEX

TDXL-GGBR7I05

Built-in Helical

Frequencies
BDS B1/B2/B3, GPS L1/L2/L5, GLONASS, Galileo E1/E5a/E5b
Key Specs
34dB LNA · IP67 · Max gain ≥2dBi · NF ≤1.5dB
Form Factor
Ø27.5mm × 56mm · 18g · SMA-J

TDXL-BA700

Internal Measurement

TDXL-BA700
Frequencies
BDS B1/B2/B3, GPS L1/L2/L5, GLONASS G1/G2, Galileo E1/E5a/E5b
Key Specs
Reactance network anti-multipath · Phase center ±2mm · 34dB LNA
Form Factor
Built-in form factor · 75g · MCX

TDXL-HA400

Multi-GNSS Single-Freq Helical

TDXL-HA400
Frequencies
BDS B1 · GPS L1 · GLONASS G1 · Galileo E1
Key Specs
34±2dB LNA · Max gain ≤2dBi · Axial ratio ≤3dB · IP67
Form Factor
11g · SMA-J · VSWR <1.8

TDXL-HA500

GPS L1/L5 Helical

TDXL-HA500
Frequencies
GPS L1 · L5
Key Specs
32±3dB LNA · L5 gain ≥-1dBi · L1 ≥-1.5dBi · NF ≤1.5dB · IP67
Form Factor
16g · SMA-K (customizable)

TDXL-801M

Built-in Multi-Freq Helical

Frequencies
BDS B1/B2/B3 · GPS L1/L2/L5 · GLONASS G1/G2 · Galileo E1/E5a/E5b
Key Specs
34±2dB LNA · Phase center ±5mm · NF ≤1.5dB · Max gain ≥2dBi
Form Factor
≤Ø20.4 × 44mm · 16g · IPEX gen1 (length customizable)

TDXL-810M

GPS Dual-Satellite Helical

Frequencies
GPS L1/L5 · BDS B1 · GLONASS G1 · Galileo E1
Key Specs
34±2dB LNA · Phase center ±5mm · Axial ratio ≤3dB · NF ≤1.5dB
Form Factor
≤Ø23 × 56mm · 16g · SMA-J

TDXL-811M

Built-in GPS Dual-Satellite

Frequencies
GPS L1/L5 · BDS B1 · GLONASS G1 · Galileo E1
Key Specs
34±2dB LNA · Phase center ±5mm · Axial ratio ≤3dB
Form Factor
≤Ø20.4 × 44mm · 16g · SMA-J

TDXL-813M

Ultra-Light Built-in Multi-Freq

Frequencies
BDS B1/B2/B3 · GPS L1/L2/L5 · GLONASS G1/G2 · Galileo E1/E5a/E5b
Key Specs
34±2dB LNA · Max gain ≥0.5dBi · Phase center ±5mm · NF ≤1.5dB
Form Factor
≤Ø20.4 × 44mm · 7g · SMA-J

TDXL-230MH

BDS Spiral Helical

TDXL-230MH
Frequencies
BDS B3I/B1I/B1C · GPS L1 · GLONASS G1
Key Specs
8-arm coupling + 4-point feed · 32±2dB LNA · B1 ≥1.5dBi / B3 ≥2dBi · Axial ratio ≤2dB
Form Factor
≤Ø23 × 56mm · 16g · SMA-J · IP67

TDXL-J230M

BDS Military-Grade Helical

TDXL-J230M
Frequencies
BDS B1I/B1C/B3I (BD2/BD3)
Key Specs
8-arm coupling + 4-point feed · 32±3dB LNA · Axial ratio ≤2dB · Two-stage filtering
Form Factor
16g · Color-matched military variant

TDXL-GGBR6I05

BDS Helical (High-Power Resistant)

Frequencies
BDS B1I/B1C · B3I
Key Specs
Front-end high-power limiter · 30±2dB LNA · Axial ratio ≤2dB · Phase center ±5mm
Form Factor
≤Ø23 × 56mm · 16g · SMA-J

TDXL-GGBR8I04

Built-in Full-Band Helical

Frequencies
BDS B1/B2/B3 · GPS L1/L2/L5 · GLONASS G1/G2 · Galileo E1/E2/E5a/E5b/E6 · L-Band
Key Specs
Dual-band reception architecture · 32±2dB LNA · NF ≤1.5dB · Phase center ±5mm
Form Factor
≤Ø24.5 × 40.4mm · 18g · IPEX (customizable)

TDXL-BA200

Ultra-Compact Built-in

TDXL-BA200
Frequencies
BDS B1 · GPS L1
Key Specs
Bias-feed RHCP · 28±2dB LNA · Max gain ≥1dBi · NF ≤1.5dB
Form Factor
≤18 × 18mm · 10g · IPEX gen4

TDXL-BA300

Air-Type Full-Band External

TDXL-BA300
Frequencies
BDS B1/B2/B3 · GPS L1/L2/L5 · GLONASS G1/G2 · Galileo E1/E5a/E5b · L-Band
Key Specs
Air dielectric · 40±2dB LNA · Zenith gain ≥5.5dBi · Dual-freq delay ≤5ns
Form Factor
External · Driver-test & CORS reference

TDXL-BA1500

Flagship External Measurement

TDXL-BA1500
Frequencies
BDS B1/B2/B3 · GPS L1/L2/L5 · GLONASS G1/G2 · Galileo E1/E5a/E5b
Key Specs
Millimeter-level phase center · 40±2dB LNA · Zenith gain ≥5.5dBi · Deformation-monitoring grade
Form Factor
External · Driverless base station reference

TDXL-SF400

Single-Band L1 Helical

Frequencies
BDS B1 · GPS L1 · GLONASS G1
Key Specs
32±2dB LNA · Phase center ±5mm · Max gain ≥2dBi · NF ≤1.5dB
Form Factor
≤Ø23 × 56mm · 18g · SMA-J

TDXL-SF500

BDS B3 Single-Band Helical

Frequencies
BDS B3
Key Specs
Lightweight handheld · 30±2dB LNA · Axial ratio ≤2dB · NF ≤1.5dB
Form Factor
≤Ø23 × 56mm · 16g · SMA-J

TDXL-CE2511A

Built-in Active Ceramic

Frequencies
GPS L1/L2 · BDS B1/B2
Key Specs
Bias-feed ceramic · 30±3dB LNA · Zenith gain ≥3dBi · Axial ratio ≤2dB
Form Factor
≤25 × 25 × 11mm · 25g · SMA-J (customizable)
TDXL-CA341 3D choke ring GNSS survey antenna mounted on a geodetic tripod

Flagship Product

TDXL-CA341 — The Reference Standard for Geodetic Networks

Our flagship 3D choke ring antenna delivers phase center accuracy within ±1 millimeter across the entire GNSS spectrum — BDS, GPS, GLONASS, Galileo, plus SBAS L-Band. The advanced 3D choke slot design optimally suppresses multipath signals, while the 46 dB low-noise amplifier supports cable runs exceeding 100 meters. Environmental testing covers salt spray (96 h), vibration (1–30 Hz), impact (300 m/s² × 18 ms × 18 cycles), anti-static (4 kV contact / 8 kV air), and precipitation (400±50 mm/h). MTBF rating of 30,000+ hours makes this the reference choice for permanent CORS installations and continuously operating reference networks.

Operating bands
BDS B1/B2/B3 · GPS L1/L2/L5 · GLONASS G1/G2 · Galileo E1/E2/E5a/E5b/E6 · L-Band
Polarization
RHCP
Maximum gain
≥7.0 dBi
Axial ratio
≤3 dB
LNA gain
46 ± 2 dB
Noise figure
≤2.0 dB
Phase center
±1 mm
Out-of-band rejection (±100 MHz)
≥40 dB
Operating voltage
3.0–12V DC
Current draw
≤50 mA
Connector
N-type (female)
Dimensions
Ø380 mm × 304 mm
Weight
≤10 kg
IP rating
IP67
MTBF
30,000 hours
Temperature
-55°C to +85°C

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FAQ

Measurement Antenna FAQs

Common procurement and integration questions for geodetic survey, RTK, and CORS applications.

What phase center accuracy do GNSource measurement antennas achieve?

Our flagship TDXL-CA341 3D choke ring delivers phase center stability within ±1 mm across the full multi-constellation GNSS spectrum. Mid-tier models such as the TDXL-800M, 801M, 810M, and BA-series helical antennas target ±5 mm. For millimeter-accurate deformation monitoring and CORS reference networks, the CA341 and BA1500 are the recommended starting points.

Which GNSS constellations and frequency bands are supported?

The full-band helical and 3D choke ring families support BDS (B1/B2/B3), GPS (L1/L2/L5), GLONASS (G1/G2), Galileo (E1/E5a/E5b), with select models also covering SBAS L-Band. Single-band variants such as TDXL-HA400, SF400, SF500, and BA200 target cost-sensitive L1-only or B3-only applications.

What LNA gain is typical, and how long of a cable run is supported?

Most GNSource measurement antennas use 34±2 dB LNA with ≤1.5 dB noise figure, suitable for roughly 30–50 m of coaxial run depending on cable quality. The TDXL-CA341 3D choke ring provides 46 dB LNA for cable runs exceeding 100 m, specifically engineered for permanent CORS installations where the receiver sits far from the antenna mast.

Do you offer built-in (OEM-embedded) variants?

Yes. TDXL-801M, 811M, 813M, GGBR7I04, and GGBR8I04 are built-in variants with IPEX (1st or 4th generation) connectors and customizable cable lengths. The TDXL-813M is our lightest multi-frequency option at 7 g — suited to compact RTK rovers, tablet integrations, and UAV payloads where weight and volume are critical.

What environmental stress standards do outdoor antennas meet?

All outdoor models are IP67 rated and tested for long-term outdoor deployment (-40 °C to +80 °C operating range, humidity 95% non-condensing). The TDXL-CA341 additionally passes salt spray (96 h), vibration (1–30 Hz), impact (300 m/s² × 18 ms × 18 cycles), and ESD (4 kV contact / 8 kV air). Its MTBF rating exceeds 30,000 hours.

What's the typical MOQ and lead time?

MOQ and lead time vary by product family and customization scope. Standard cataloged models generally ship in production-level quantities; custom frequency tuning, connector swaps, or color matching extend lead time. Contact our sales team with your target model and quantity for a concrete quote and schedule.

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