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GNSS Signal Simulation — Certification Grade

NSG8000

Multi-Constellation GNSS Signal Simulator Series

Full-featured multi-constellation GNSS signal simulation for advanced R&D, real-time HIL testing, and certification workflows. Supports BDS, GPS, GLONASS, and Galileo — with trajectory import, configurable HIL update rates from 1 Hz to 1 kHz, end-to-end latency of ≤10 ms, and multipath simulation.

4+
Constellations
70
Signal Channels
±0.03 m
Pseudorange Accuracy
≤10 ms
End-to-End HIL Latency
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NSG8000
NSG8000 multi-constellation GNSS signal simulator for real-time HIL testing
Overview Capabilities Specifications Applications Optional Modules Related Products
Product Overview

When your program requires certification-grade signal fidelity.

The NSG8000 is the correct choice when your test program requires multi-constellation coverage, trajectory import, multipath simulation, and structured certification evidence — not just a signal source that "generates GNSS."

NSG8000 supports BDS/GPS/GLONASS/Galileo signal simulation and can be extended to QZSS and IRNSS. It provides the full signal environment control required for receiver characterization under DO-229, EN 302 645, and program-specific test plans — including ionosphere/troposphere delay modeling, multiple pseudorange models, and real-time trajectory injection.

The platform is designed for engineering teams that need to run the same test scenario multiple times with identical signal conditions — essential for regression testing, performance characterization, and certification evidence collection where repeatability is a hard requirement.

With a 3U rackmount form factor, standard RF/timing interfaces, and optional INS/GNSS integration, the NSG8000 integrates directly into existing test bench infrastructure without requiring custom RF conditioning or timing distribution hardware.

01

Certification-Ready Signal Environment

Controlled constellation, carrier, and delay parameters meet the signal fidelity requirements of DO-229 and EN 302 645 test plans.

02

Real-Time Trajectory Injection

Import pre-planned trajectories or inject dynamics in real time — enabling both scripted test sequences and live HIL simulation.

03

Multipath & Propagation Modeling

4-channel multipath simulation per frequency point, plus ionosphere/troposphere delay modeling for realistic signal environments.

04

Extensible Constellation Support

Base platform covers BDS/GPS/GLONASS/Galileo/SBAS. QZSS and IRNSS available as software extensions without hardware changes.

Engineering Capabilities

Six core capabilities that define the NSG8000’s test coverage.

Each capability is engineered to address a specific class of receiver test requirement — from basic signal generation to complex multi-path HIL environments.

Constellation & Carrier Control

Full control over constellation selection, carrier frequency, and signal power for each channel. Supports BDS B1I/B1C/B2a/B2b/B3I, GPS L1-L5, GLONASS L1/L2, Galileo E1/E5a/E5b, and SBAS — with per-channel power control across a 100 dB dynamic range.

Trajectory Import & Real-Time Injection

Import pre-planned trajectory files, including NMEA and custom formats, for scripted test sequences, or inject dynamics in real time via Ethernet/RS-232 for hardware-in-the-loop configurations. Supports static, kinematic, and high-dynamic profiles up to ±200,000 m/s velocity.

Ionosphere & Troposphere Delay Simulation

Klobuchar ionospheric model with configurable parameters, plus tropospheric delay modeling for realistic signal propagation. Essential for testing receiver compensation algorithms and evaluating positioning accuracy under atmospheric variation scenarios.

Multipath Signal Simulation

4 multipath channels per frequency point — configurable delay, power offset, and phase for each reflected signal. Enables realistic urban canyon, indoor, and complex signal environment simulation for evaluating receiver multipath mitigation performance.

Multiple Pseudorange Models

Supports multiple pseudorange error models for different test modes — including clean signal, error injection, and fault simulation. Enables testing of receiver RAIM algorithms, integrity monitoring, and fault detection/exclusion performance under controlled error conditions.

Data Logging & Standard I/O

Continuous data logging with configurable record intervals. Standard output formats for post-processing and analysis integration. 10 MHz reference and 1PPS I/O for timing synchronization with external instruments, enabling multi-system test configurations.

Hardware-in-the-Loop Simulation

Real-Time HIL &
Multi-Receiver Simulation

Closed-loop GNSS simulation with a defined end-to-end response path, high-rate motion updates, and configurable multi-RF output capability.

Real-Time Closed-Loop Testing

Convert external motion data into corresponding GNSS RF signals in real time.

NSG8000 supports real-time hardware-in-the-loop testing by continuously converting externally supplied motion data into corresponding GNSS RF signals.

The system supports configurable HIL update rates from 1 Hz to 1 kHz, with an externally specified end-to-end latency of ≤10 ms from motion data input to RF signal output.

With the optional multi-RF configuration, a single NSG8000 can support up to four RF outputs. Each output can represent a receiver at a different position and under a different motion state.

  • Navigation Receivers
  • GNSS/INS Integration
  • Vehicle Control Systems
  • Guidance Algorithms
Complete Response Path

What “end-to-end latency” means

01 Motion Data Input External position and motion-state data
02 NSG8000 HIL Engine Real-time scenario and signal update
03 GNSS RF Output Corresponding RF signal delivered to the DUT
End-to-End Measurement Measured across the complete path from external motion data input to corresponding RF signal output.
≤10 ms
PARAMETER 01 ≤10 ms End-to-End HIL Latency From external motion data input to the corresponding GNSS RF signal output.
PARAMETER 02 1 Hz–1 kHz HIL Update Rate Configurable according to the dynamics and control-loop requirements of the test system.
PARAMETER 03 Up to 4 Configurable RF Outputs Simulate up to four receivers with different positions and motion states on a single NSG8000.
Multi-RF output capability is configuration-dependent. RF output quantity and HIL interface requirements are confirmed according to the customer’s test architecture.
Technical Specifications

Complete specification data
for the NSG8000 Series.

Core specifications are shown for the NSG8000 platform. HIL interfaces, RF output quantity, and other optional capabilities are configured according to project requirements.

Signal Types

Supported GNSS signal frequencies and modulations

BDS (BeiDou)
  • B1I, B1C, B2a, B2b, B3I
  • Authorized signals (on request)
GPS
  • L1 C/A, L1C, L1P
  • L2C, L2P
  • L5
GLONASS
  • L1 (FDMA)
  • L2 (FDMA)
Galileo
  • E1 (B/C)
  • E5a, E5b
SBAS
  • WAAS (L1)
  • EGNOS (L1)
  • MSAS (L1)
Extensible
QZSS, IRNSS (software option)

Signal Channels

Number of simultaneous signal channels per constellation

BDS
18 channels
GPS
18 channels
GLONASS
12 channels
Galileo
18 channels
SBAS
4 channels
Total
70 channels (simultaneous, all constellations)
Multipath Channels
4 channels per frequency point

Signal Dynamics

Maximum user dynamics supported in simulation

Max Altitude
≥ 100 km
Max Velocity
± 200,000 m/s
Max Acceleration
± 10,000 m/s²
Max Jerk
± 15,000 m/s³
Dynamic Profiles
Static, kinematic, high-dynamic, user-defined trajectory

HIL & Multi-RF

Real-time closed-loop performance and configurable multi-receiver RF simulation

Configuration-Dependent
HIL Update Rate
1 Hz to 1 kHz
End-to-End HIL Latency
≤10 ms
Latency Measurement Path
External motion data input to corresponding GNSS RF signal output
RF Output Configuration
Configurable — up to 4 RF outputs per system
Independent Simulated Receivers
Up to 4 simultaneous simulated receivers
Per-Output Motion State
Independent position and motion state for each simulated receiver
Typical Applications
Closed-loop HIL, multi-receiver, multi-vehicle, and integrated GNSS/INS testing
Configuration note: RF output quantity is selected according to the required test architecture. Up to four RF outputs are supported per NSG8000 system.

Signal Accuracy

Pseudorange, rate, and channel coherence specifications

Pseudorange Accuracy
± 0.03 m
Pseudorange Rate Accuracy
± 0.003 m/s
Channel-to-Channel Coherence
≤ 0.3 ns
Positioning Error
≤ 0.1 m (after calibration)
Spurious Power
≤ −50 dBc
Harmonic Power
≤ −50 dBc

Output Level

RF output power range and accuracy

Power Range
−120 dBm to −20 dBm
Absolute Power Accuracy
0.5 dBm
Power Linearity
≤ 1 dB
RF Output Connector
N (female)

Carrier Phase Noise

Phase noise at various offset frequencies

@ 100 Hz Offset
−80 dBc/Hz
@ 1 kHz Offset
−90 dBc/Hz
@ 10 kHz Offset
−95 dBc/Hz
@ 100 kHz Offset
−105 dBc/Hz

Time / Frequency Reference

Internal oscillator and external reference specifications

Frequency Stability
≤ 5 × 10⁻¹¹ /s
Frequency Accuracy
≤ 5 × 10⁻⁸ /s
10 MHz Reference
Input / Output — BNC (female)
1PPS Reference
Input / Output — BNC (female)

Physical Characteristics

Mechanical and power specifications

Form Factor
Standard 3U rackmount (19")
Weight
≤ 14.5 kg
Input Voltage
196–245 VAC
AC Frequency
50–60 Hz
Power Consumption
≤ 120 W

Interfaces

Physical connectors and communication interfaces

RF Output
N (female)
10 MHz Ref I/O
BNC (female)
1PPS I/O
BNC (female)
Serial
RS-232
Ethernet
RJ45 (10/100/1000M)
Application Scenarios

Three primary test scenarios
where NSG8000 is the right tool.

Each scenario describes the engineering challenge, why a controlled signal environment is required, and how the NSG8000 addresses it.

Scenario 01

R&D Validation, Debugging & Failure Analysis

The challenge: Real-world GNSS signals are uncontrolled — you cannot reproduce a specific satellite geometry, signal level, or propagation condition on demand. When a receiver fails in the field, you cannot recreate the exact conditions in the lab.

NSG8000 creates repeatable, controllable GNSS scenarios to reproduce issues and validate fixes across firmware and algorithm iterations. Set the exact satellite geometry, signal levels, dynamics, and propagation conditions — then run the same scenario 100 times with identical inputs. When a fix is applied, the same scenario confirms it resolved the issue without introducing regressions.

Firmware Debugging Algorithm Validation Failure Reproduction Regression Testing
Scenario 02

Receiver Performance Verification Under Repeatable Scenarios

The challenge: Comparing two receivers — or two firmware versions — requires identical test conditions. Live sky testing introduces uncontrolled variables such as satellite geometry, atmospheric conditions, and multipath that make fair comparison impossible.

NSG8000 benchmarks acquisition, tracking, sensitivity, and positioning performance under identical simulated conditions for fair comparison. Define the test scenario once — satellite geometry, signal levels, dynamics, multipath profile — and run it against multiple receivers or firmware builds with zero variation in the input signal environment.

Sensitivity Testing Acquisition Benchmarking Tracking Performance Firmware Comparison
Scenario 03

Certification-Style Evaluation & Acceptance Testing

The challenge: Certification test plans such as DO-229, EN 302 645, and program-specific requirements need specific signal conditions, dynamics, and error scenarios that cannot be generated with live sky signals. Evidence must be reproducible and auditable.

NSG8000 runs standardized test cases with controlled signals and dynamics to support compliance-oriented evaluation and customer acceptance. The platform provides the signal fidelity, repeatability, and documentation capability required to generate structured certification evidence — including trajectory import for specific test scenarios and data logging for audit trails.

DO-229 Testing EN 302 645 Acceptance Testing Certification Evidence
Optional Modules

Extend NSG8000 capabilities
for advanced test requirements.

Optional modules are software-activated extensions that add capability to the base NSG8000 platform without hardware changes. All optional modules are provided for authorized evaluation use and must comply with applicable laws and regulations.

Optional Module 01

Real-Time Closed-Loop Simulation

Enables real-time feedback between the receiver under test and the simulator — the receiver's position output is fed back to update the simulated signal environment in real time. Required for testing navigation algorithms that adapt to their own position estimate, including guidance systems and closed-loop navigation filters.

Requires Ethernet interface connection between receiver and NSG8000 control system.
Optional Module 02

INS/GNSS Integrated Navigation Simulation

Adds inertial navigation system (INS) simulation capability — generates synchronized GNSS and IMU data streams for testing integrated GNSS/INS navigation systems. Enables evaluation of sensor fusion algorithms, GNSS outage handling, and dead-reckoning performance under controlled conditions.

Provides synchronized IMU data output (acceleration, angular rate) alongside GNSS signals.
Optional Module 03

Multi-RF Output & Multi-Receiver Simulation

Configures the NSG8000 with multiple RF outputs for simultaneous testing of multiple GNSS receivers, vehicles, or navigation units. A single system can support up to four RF outputs, with each output representing a receiver at a different position and under a different motion state.
This capability supports multi-vehicle simulation, distributed receiver testing, formation scenarios, and parallel validation of navigation equipment.

Available with up to four RF outputs. The required RF hardware and simulation configuration are selected according to the project requirements.
Optional Module 04

RTCM Differential Simulation

Generates RTCM correction data streams synchronized with the simulated GNSS signals — enabling testing of DGNSS and RTK receivers under controlled differential positioning conditions. Supports RTCM 2.x and 3.x message formats, with configurable baseline length and correction accuracy parameters.

Requires RTCM output interface configuration. Contact engineering for compatibility details.
Engineering Support

Ready to evaluate the NSG8000
for your test program?

Our engineering team can review your test objectives, signal requirements, and certification plan — and confirm whether NSG8000 is the right configuration before you commit.

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