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Blog - Testing multipath mitigation in GNSS timing receivers for 5G networks

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Eleftherios Drosinos

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Blog - As new GNSS receiver standards emerge, developers face new test challenges 

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Blog - The GPS Week Number Rollover problem

Blog - Performance testing for a new generation of Galileo PRS + GPS M-Code receivers

pnt-blog-10-28-2020 Multipath GNSS signals are a threat to timing receivers in 4G and 5G networks

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Blog - New threats to GNSS require new approaches to receiver testing


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Guy Buesnel

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Blog - New GNSS signals bring new simulation challenges for receiver developers

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A guide for engineers integrating GPS / GNSS capabilities into new devices 

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Timing accuracy in multipath conditions: significant deviations exceed ITU-defined tolerances

Blog - Commercial CubeSat missions: why GNSS testing with a simulator is essential

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Rahul Gupta

Timing accuracy in clear-sky conditions: timing outputs remain well within the 100ns performance threshold

pnt-blog-3 Timing accuracy in clear-sky conditions: timing outputs remain well within the 100ns performance threshold

Stuart Smith 

Recent GNSS issues provide new test cases for receiver developers

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Blog - Recent GPS and Galileo issues provide new test cases for receiver developers

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pnt-blog-1 Testbed setup for 1PPS and PTP outputs from the timing receiver device under test (DUT)

pnt-blog-2 Simulation of line of sight (white), reflected (red) and diffracted (blue) signals, San Francisco location

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Stuart Smith

Understanding the threat of GNSS signal spoofing can help you to mitigate. Spirent's Guy Buesnel explores GNSS spoofing attacks with examples and looks the bigger picture. 

With GNSS Spoofing Attacks on the Rise, Resilience and Robustness Go Hand-in-Hand

Understanding the threat of spoofing can help you to mitigate. Spirent's Guy Buesnel explores.

Mia Swain

For How to Construct a GPS/GNSS Test Plan

CPhys, FRIN,  Product Manager – GNSS Vulnerabilities 

Guy Buesnel

Some GPS receivers may malfunction on or after 6 April 2019 due to the GPS Week Rollover. Here’s what that means and how to check if a receiver is vulnerable.  

The GPS Week Number Rollover problem

Test as a Service

Find out how Spirent used live sky signals alongside simulation to demonstrate how commercial GPS receivers are vulnerable to spoofing attacks.

GPS Spoofing: New Live Sky Tests Confirm Receivers Are Vulnerable to Attack

New tests conducted by Spirent in a live sky environment demonstrate that some commercial GPS receiver models can be compromised by spoofing devices at 10m, 50m and 100m distance.

With RF interference and spoofing attacks both on the rise, GNSS receiver developers must be able to simulate new threat sources in the lab. Spirent can help.

New threats to GNSS require new approaches to receiver testing

With RF interference and spoofing attacks both on the rise, GNSS receiver developers must be able to simulate new threat sources in the lab. 

Testbed setup for 1PPS and PTP outputs from the timing receiver device under test (DUT)

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PNT functionality is getting more complex, making it vital to fix issues earlier in the product cycle. Spirent SimIQ helps receiver designers to test early and avoid costly rework.

From RF to I/Q: Why GNSS receiver testing is ‘shifting left’

5G requires GNSS time clocks to be located at or near street level. That makes them vulnerable to multipath. Spirent looks at the challenges this brings developers. 

Testing multipath mitigation in GNSS timing receivers for 5G networks

5G requires GNSS time clocks to be located at or near street level. That makes them vulnerable to multipath, creating design and test challenges for developers. 

Will Thornton

As reliance on GNSS grows, new safety and performance standards will likely emerge. A flexible testbed will create a solid foundation for future conformance testing. Spirent explores.

As new GNSS receiver standards emerge, developers face new test challenges 

As reliance on GNSS grows, new safety and performance standards will likely emerge. A flexible testbed will create a solid foundation for future conformance testing.

As New GNSS Receiver Standards Emerge, Developers Face New Test Challenges 

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More industries are using CubeSats for communications and data services, with many containing GPS/GNSS receivers for orbit determination and timekeeping.

Commercial CubeSat missions: why GNSS testing with a simulator is essential

Simulation of line of sight (white), reflected (red) and diffracted (blue) signals, San Francisco location

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Romain Zimmermann

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From 13 June 2017, all new GNSS equipment sold in the EU must be tested to ensure activity in nearby frequency bands doesn’t interfere with performance. Here’s what you need to know.

EU Radio Equipment Directive: What GPS Device Manufacturers Need To Know

Performance testing for a new generation of Galileo PRS + GPS M-Code receivers

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A 5G network architecture typically requires primary reference time clocks (essentially GNSS receivers) to be installed near clusters of short-range base stations. Many clocks will be installed at street level in built-up areas, rather than on top of towers or tall buildings as has been the case with 4G. Multipath signals abound in such locations, while the narrow view of the sky often limits the number of line-of-sight satellite signals available. Both issues can severely affect a receiver’s ability to maintain accurate time, to the point where network quality of service can be seriously impacted.



Modern cellular networks need accurate time signals from GNSS satellites to keep transmission in sync. With Spirent’s help, NTT and Furuno have developed an algorithm for GNSS timing receivers that eliminates the effects of multipath, dramatically improvi

Spirent solutions help NTT and Furuno develop pioneering multipath mitigation algorithm for GNSS timing receivers

Spirent solutions help NTT & Furuno develop pioneering multipath mitigation algorithm

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Talini Pinto Jayawardena

蜂窝网络依靠GNSS授时接收机实现精确的时间同步。此博客将探讨并演示多径信号如何对安装于人口稠密的城市区域的授时接收器造成严重威胁。

多径GNSS信号对4G和5G网络中的授时接收机形成威胁

蜂窝网络依靠GNSS授时接收机实现精确的时间同步。我们的试验表明，多径信号会对安装于人口稠密的城市区域的授时接收器造成严重威胁，而这也是此博客探讨的话题。

As the GNSS environment evolves, receiver developers must be able to test with the full range of existing and future signals. Spirent is committed to making that happen.

New GNSS signals bring new simulation challenges for receiver developers

构建包含经过验证的真实性的详细3D环境，实现先进的多径和遮挡测试。

Sim3D多径模拟软件

为多径和遮挡测试构建真实的3D环境

本电子书指出，随着人们对全球导航卫星系统（GNSS）接收机的依赖程度越来越高，我们已经无法再使用真实天空测试、记录和回放，以及统计建模等传统的方法来评估接收机应对多径和遮挡的能力。



在这本电子书中，我们探讨了为什么开发者需要在多径和遮挡测试中实现更高的真实度。

如何模拟GNSS信号在城市环境中的传播

Should you test against GNSS segment errors? This blog explores the types, frequency, and impact on users of satellite system errors, and looks at what developers can do to protect their customers.

Recent GPS and Galileo issues provide new test cases for receiver developers

Issues like the GPS Week Number Rollover and recent Galileo outage mean developers and users should verify that each system’s ICD is correctly implemented in their firmware.

For any new GPS/GNSS-enabled device, thorough testing is essential – but the tests you run, and the standards you apply, will depend on what it is you’re developing, the ways it’s likely to be used, and the levels of performance your users expect.



A guide for engineers integrating GPS/GNSS capabilities into new devices

How to Construct a GPS/GNSS Test Plan

Find out how and why our customer chose to engage our professional services team to evaluate the geo-location performance of several IoT devices.

Our client asked us to benchmark performance of its IoT devices to facilitate smooth deployment

Advancing the Internet of Things with Spirent’s Test as a Service

Test as a Service Case Study

Professional Services Engineer

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