--- title: Inside Frequency Control | Bliley Technologies | GPS & GNSS description: GPS & GNSS | Bliley Technologies has been a leader in low phase frequency control products for more than 80 years. Our blog discusses radio frequency, electronic design, and industry news. --- [![Bliley technologies](https://blog.bliley.com/hubfs/Logo_Files/Bliley-logo-dark-bgArtboard%202.svg "Bliley technologies")](https://www.bliley.com) - Solutions - [Blog](https://blog.bliley.com) - - [Buy Online](https://shop.bliley.com/) # Inside Frequency Control ## [GPSDOs for CubeSats & Other SmallSats: GPS Disciplined Oscillator Design & Architecture](https://blog.bliley.com/gpsdos-for-cubesats-smallsats-design-architecture) Posted by [Bliley Technologies](https://blog.bliley.com/author/bliley-technologies) on Jul 31, 2024 9:00:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/gpsdos-for-cubesats-and-other-smallsats-gps-disciplined-oscillator-design-and-architecture.jpg?width=441&height=245&name=gpsdos-for-cubesats-and-other-smallsats-gps-disciplined-oscillator-design-and-architecture.jpg)](https://blog.bliley.com/gpsdos-for-cubesats-smallsats-design-architecture) GPS disciplined oscillators (GPSDOs) are becoming a necessary component for CubeSats and other small satellites (SmallSats). GPSDOs are comprised of a Global Position System (GPS) receiver, an oven controlled crystal oscillator (OCXO), and a phased-locked loop (PLL). In this blog, you'll get a deeper look into how GPSDOs are designed to help achieve mission success for your small satellite applications. [Read More](https://blog.bliley.com/gpsdos-for-cubesats-smallsats-design-architecture) 1 Comment [Click here to read/write comments](https://blog.bliley.com/gpsdos-for-cubesats-smallsats-design-architecture#comments-listing) Topics: [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss) ## [Assured PNT: Going Beyond GPS Timing](https://blog.bliley.com/assured-pnt-going-beyond-gps-timing) Posted by [Bliley Technologies](https://blog.bliley.com/author/bliley-technologies) on Nov 30, 2023 9:00:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/assured-pnt-going-beyond-gps-timing.jpg?width=441&height=245&name=assured-pnt-going-beyond-gps-timing.jpg)](https://blog.bliley.com/assured-pnt-going-beyond-gps-timing) While GPS technology plays an important role in modern navigation, it's not perfect. Although GPS might perform well enough consumer usage, signal jamming or other disruptions present serious threats to military operations.  Enter assured positioning, navigation, and timing (A-PNT), new technology that enhances traditional GPS timing. Assured PNT uses additional sources to augment GPS and prevent vulnerabilities. Its goal is to ensure that accurate positioning, navigation, and timing (PNT) is always available. In this blog, we'll review GPS, its flaws, and other PNT systems (like the GNSS) and give you an overview of how [assured PNT technology](https://www.bliley.com/assured_positioning_navigation_timing_pnt_gps) uses other systems to improve effectiveness.  [Read More](https://blog.bliley.com/assured-pnt-going-beyond-gps-timing) 1 Comment [Click here to read/write comments](https://blog.bliley.com/assured-pnt-going-beyond-gps-timing#comments-listing) Topics: [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss), [Defense & PNT](https://blog.bliley.com/topic/defense-pnt) ## [What Are GPS Disciplined Oscillators (GPSDO)?](https://blog.bliley.com/what-are-gps-disciplined-oscillators-gpsdo-applications) Posted by [Bliley Technologies](https://blog.bliley.com/author/bliley-technologies) on Apr 27, 2023 9:00:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/What%20Are%20GPS%20Disciplined%20Oscillators%20(GPSDOs)_.png?width=441&height=245&name=What%20Are%20GPS%20Disciplined%20Oscillators%20(GPSDOs)_.png)](https://blog.bliley.com/what-are-gps-disciplined-oscillators-gpsdo-applications) GPS disciplined oscillators (GPSDO) are some of today's most trusted and accurate sources of timing. These powerful devices (sometimes called GPS clocks) consist of a [high-quality stable oscillator](https://www.bliley.com/high-performance-oscillators?on=us) and a GPS receiver. The GPSDO works by disciplining (or steering) the oscillator output to a GPS device or GNSS satellite signal via a tracking loop. [Read More](https://blog.bliley.com/what-are-gps-disciplined-oscillators-gpsdo-applications) 2 Comments [Click here to read/write comments](https://blog.bliley.com/what-are-gps-disciplined-oscillators-gpsdo-applications#comments-listing) Topics: [crystal oscillators](https://blog.bliley.com/topic/crystal-oscillators), [RF Technology](https://blog.bliley.com/topic/rf-technology), [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss), [Integrated RF](https://blog.bliley.com/topic/integrated-rf), [Defense & PNT](https://blog.bliley.com/topic/defense-pnt) ## [What's The Differences Between the 5 GNSS Constellations?](https://blog.bliley.com/the-differences-between-the-5-gnss-satellite-network-constellations) Posted by [Rob Rutkowski](https://blog.bliley.com/author/rob-rutkowski) on Jan 25, 2022 8:30:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/Blog/Graphics/The%205%20GNSS%20Constellations%20Explained.png?width=441&height=245&name=The%205%20GNSS%20Constellations%20Explained.png)](https://blog.bliley.com/the-differences-between-the-5-gnss-satellite-network-constellations) Before we dive into the differences between the 5 GNSS constellations... It's important that we're all on the same page with the difference between GNSS and GPS. Many people get GNSS and GPS technology confused. A good way to think about the Global Navigation Satellite Systems (GNSS) is as the backbone (or underlying technology) behind GPS. The Global Positioning System (GPS) GPS is a GNSS constellation, but GNSS is not always GPS. GPS is one of the 5 GNSS constellations used around the world. The 5 GNSS constellations include GPS (US), QZSS (Japan), BEIDOU (China), GALILEO (EU), and GLONASS (Russia). We'll cover each of these constellations in-depth in this post. [Read More](https://blog.bliley.com/the-differences-between-the-5-gnss-satellite-network-constellations) 15 Comments [Click here to read/write comments](https://blog.bliley.com/the-differences-between-the-5-gnss-satellite-network-constellations#comments-listing) Topics: [Space & Satellites](https://blog.bliley.com/topic/space-satellites), [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss) ## [5G Fixed Wireless Access (FWA) Systems: 5 Critical Design Decisions](https://blog.bliley.com/5g-fixed-wireless-access-fwa-systems) Posted by [Rob Rutkowski](https://blog.bliley.com/author/rob-rutkowski) on May 6, 2020 7:45:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/Blog/Graphics/5G%20FWA%20Graphic.png?width=441&height=245&name=5G%20FWA%20Graphic.png)](https://blog.bliley.com/5g-fixed-wireless-access-fwa-systems) 5G Fixed Wireless Access (FWA) will be one of the earliest uses of 5G. 5G FWA will provide lightning fast gigabit internet speeds to homes, apartments, and businesses. Better yet, 5G FWA will be a fraction of the cost compared to traditional cable & fiber systems. [Read More](https://blog.bliley.com/5g-fixed-wireless-access-fwa-systems) 1 Comment [Click here to read/write comments](https://blog.bliley.com/5g-fixed-wireless-access-fwa-systems#comments-listing) Topics: [5G](https://blog.bliley.com/topic/5g), [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss) ## [6 Emerging PNT Technologies & Solutions of the Future](https://blog.bliley.com/6-emerging-pnt-technologies-solutions-of-the-future) Posted by [Rob Rutkowski](https://blog.bliley.com/author/rob-rutkowski) on Jan 7, 2020 8:42:08 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/Blog/Graphics/6%20Emerging%20PNT%20Technologies%20%26%20Solutions.png?%20Solutions.png&width=441&height=245&name=6%20Emerging%20PNT%20Technologies%20%26%20Solutions.png?%20Solutions.png)](https://blog.bliley.com/6-emerging-pnt-technologies-solutions-of-the-future) The U.S Department of Homeland Security considers 13 of the nation’s 16 critical infrastructure sectors to be ‘critically dependent’ on PNT technology. Also, a loss of PNT would cost the U.S an estimated **$10 BILLION a day**. Not only do many everyday consumers use PNT & GPS on a daily basis, it's also crucial for military and intelligence operations. Other industries that strongly rely on GPS based PNT include - Radio communications - Network synchronization - Intelligence systems - Information gathering - Cruise missiles - Weapons systems - [Electronic warfare](https://blog.bliley.com/technologies-that-changed-electronic-warfare) In this post we're going to cover some of the challenges facing PNT today as well as 6 emerging PNT technologies and solutions that will revolutionize the future. [Read More](https://blog.bliley.com/6-emerging-pnt-technologies-solutions-of-the-future) 2 Comments [Click here to read/write comments](https://blog.bliley.com/6-emerging-pnt-technologies-solutions-of-the-future#comments-listing) Topics: [Space & Satellites](https://blog.bliley.com/topic/space-satellites), [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss), [Military & Defense](https://blog.bliley.com/topic/military-defense), [Defense & PNT](https://blog.bliley.com/topic/defense-pnt) ## [\[Press Release\] Bliley Introduces 'Atlas 1PPS' - GPS Disciplined OCXO](https://blog.bliley.com/press-release-bliley-atlas-gps-disciplined-ocxo-gpsdo) Posted by [Bliley Technologies](https://blog.bliley.com/author/bliley-technologies) on Feb 26, 2019 9:46:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/press-release.jpeg?width=441&height=245&name=press-release.jpeg)](https://blog.bliley.com/press-release-bliley-atlas-gps-disciplined-ocxo-gpsdo) [Read More](https://blog.bliley.com/press-release-bliley-atlas-gps-disciplined-ocxo-gpsdo) 1 Comment [Click here to read/write comments](https://blog.bliley.com/press-release-bliley-atlas-gps-disciplined-ocxo-gpsdo#comments-listing) Topics: [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss), [Integrated RF](https://blog.bliley.com/topic/integrated-rf), [Defense & PNT](https://blog.bliley.com/topic/defense-pnt) ## [Critical Infrastructure in the 21st Century (GNSS & PNT Solutions)](https://blog.bliley.com/gnss-gps-pnt-in-critical-infrastructure-21st-century) Posted by [Rob Rutkowski](https://blog.bliley.com/author/rob-rutkowski) on Aug 21, 2018 9:45:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/Blog/21st%20Century%20GNSS%20and%20PNT.jpg?width=441&height=245&name=21st%20Century%20GNSS%20and%20PNT.jpg)](https://blog.bliley.com/gnss-gps-pnt-in-critical-infrastructure-21st-century) Building resilience into Global Positioning System (GPS) timing and frequency receivers is crucial in the 21st century. Since the presidential directive on U.S Space-Based Position, Navigation, and Timing (PNT) and Critical Infrastructure Protection (PPD-21), federal agencies have been advancing their efforts when it comes to GPS and Global Navigation Satellite System (GNSS) capabilities.  [Read More](https://blog.bliley.com/gnss-gps-pnt-in-critical-infrastructure-21st-century) 1 Comment [Click here to read/write comments](https://blog.bliley.com/gnss-gps-pnt-in-critical-infrastructure-21st-century#comments-listing) Topics: [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss), [Defense & PNT](https://blog.bliley.com/topic/defense-pnt) ## [The Role of Positioning, Navigation, and Timing for Today's GPS](https://blog.bliley.com/the-role-of-positioning-navigation-and-timing-for-todays-gps) Posted by [Bliley Technologies](https://blog.bliley.com/author/bliley-technologies) on Sep 20, 2016 6:30:00 AM - [Tweet](https://twitter.com/share) [![](https://blog.bliley.com/hs-fs/hubfs/The_Role_of_Positioning.png?width=441&height=245&name=The_Role_of_Positioning.png)](https://blog.bliley.com/the-role-of-positioning-navigation-and-timing-for-todays-gps) One of the most significant changes to the way the military operates has been the integration of GPS for positioning, navigation, and timing purposes, which has given military forces unprecedented command and control over battle grounds. Troops and command centers are now in a state of continuous situational awareness, with an endless stream of data being added to military servers at all time. [Read More](https://blog.bliley.com/the-role-of-positioning-navigation-and-timing-for-todays-gps) 0 Comments [Click here to read/write comments](https://blog.bliley.com/the-role-of-positioning-navigation-and-timing-for-todays-gps#comments-listing) Topics: [GPS & GNSS](https://blog.bliley.com/topic/gps-gnss), [Defense & PNT](https://blog.bliley.com/topic/defense-pnt) [All posts](https://blog.bliley.com/all) Search for a Topic Search [![GPSDO Oscillator Infrastructure Ebook.png](https://blog.bliley.com/hs-fs/hubfs/Blog/GPSDO%20Oscillator%20Infrastructure%20Ebook.png?width=240&height=272&name=GPSDO%20Oscillator%20Infrastructure%20Ebook.png "GPSDO Oscillator Infrastructure Ebook.png")](https://resources.bliley.com/gpsdo-oscillator-white-paper-gps) ### Subscribe... get an eBook! ### Categories - [crystal oscillators (68)](https://blog.bliley.com/topic/crystal-oscillators) - [RF Technology (63)](https://blog.bliley.com/topic/rf-technology) - [Space & Satellites (43)](https://blog.bliley.com/topic/space-satellites) - [engineering (38)](https://blog.bliley.com/topic/engineering) - [general (38)](https://blog.bliley.com/topic/general) - [Defense & PNT (26)](https://blog.bliley.com/topic/defense-pnt) - [General Topics (26)](https://blog.bliley.com/topic/general-topics) - [Press Release (22)](https://blog.bliley.com/topic/press-release) - [Clocks & Crystals (20)](https://blog.bliley.com/topic/clocks-crystals) - [Military & Defense (17)](https://blog.bliley.com/topic/military-defense) - [aerospace (17)](https://blog.bliley.com/topic/aerospace) - [Leadership (16)](https://blog.bliley.com/topic/leadership) - [Integrated RF (14)](https://blog.bliley.com/topic/integrated-rf) - [GPS & GNSS (9)](https://blog.bliley.com/topic/gps-gnss) - [Engineering Equiptment (7)](https://blog.bliley.com/topic/engineering-equiptment) - [5G (6)](https://blog.bliley.com/topic/5g) - [IoT (6)](https://blog.bliley.com/topic/iot) - [Filters & Multiplexers (1)](https://blog.bliley.com/topic/filters-multiplexers) See all ### See What's Popular ### Most Recent [Creepy Radio Frequencies: The Scariest Sounds in Space](https://blog.bliley.com/creepy-sounds-from-space) posted on 8/30/21 6:30 AM ![creepy radio frequencies: the scariest sounds in space](https://blog.bliley.com/hs-fs/hubfs/creepy-radio-frequencies-the-scariest-sounds-in-space.jpg?width=100&height=50&name=creepy-radio-frequencies-the-scariest-sounds-in-space.jpg) [Clipped Sine Wave Oscillators: TCXOs & Their Common Applications](https://blog.bliley.com/clipped-sine-wave-oscillators-tcxos) posted on 8/30/21 6:30 AM ![clipped sine wave oscillators tcxos and their common applications](https://blog.bliley.com/hs-fs/hubfs/clipped-sine-wave-oscillators-tcxos-and-their-common-applications.jpg?width=100&height=50&name=clipped-sine-wave-oscillators-tcxos-and-their-common-applications.jpg) [RF PCB Design Considerations: RF Circuit Board Layout Guidelines](https://blog.bliley.com/rf-pcb-design) posted on 8/30/21 6:30 AM ![rf pcb design considerations rf circuit board layout guidelines](https://blog.bliley.com/hs-fs/hubfs/rf-pcb-design-considerations-rf-circuit-board-layout-guidelines.jpg?width=100&height=50&name=rf-pcb-design-considerations-rf-circuit-board-layout-guidelines.jpg) [3 Questions to Ask Before Choosing a Crystal Oscillator Manufacturer](https://blog.bliley.com/questions-for-crystal-oscillator-manufacturers) posted on 8/30/21 6:30 AM ![3 questions to ask before choosing a crystal oscillator manufacturer](https://blog.bliley.com/hs-fs/hubfs/3-questions-to-ask-before-choosing-a-crystal-oscillator-manufacturer.jpg?width=100&height=50&name=3-questions-to-ask-before-choosing-a-crystal-oscillator-manufacturer.jpg) [CMOS vs. LVCMOS: Which Is the Best Output Signal for Your Application?](https://blog.bliley.com/cmos-lvcmos-best-output-signal) posted on 8/30/21 6:30 AM ![cmos vs lvcmos which is the best output signal for your application](https://blog.bliley.com/hs-fs/hubfs/cmos-vs-lvcmos-which-is-the-best-output-signal-for-your-application.jpg?width=100&height=50&name=cmos-vs-lvcmos-which-is-the-best-output-signal-for-your-application.jpg) ##### Disclosure: This blog contains product affiliate links to help support the blog. 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