Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteWindows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstalliTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
Xona’s Pulsar is a planned low Earth orbit (LEO) satellite system for positioning, navigation and timing. A compatible receiver measures the arrival time and other properties of Pulsar signals, then combines those measurements with satellite orbit and clock information to calculate its position and time. Pulsar-0 is in orbit and undergoing testing; continuous global service depends on launching and operating a much larger constellation.
What Pulsar is—and what it is not
Pulsar is Xona Space Systems’ planned satellite-based positioning, navigation and timing (PNT) system. Like GPS, it is designed to let a receiver determine location and time from signals broadcast by satellites. Its central design difference is the satellites’ orbit: Pulsar is planned for low Earth orbit, while traditional navigation constellations such as GPS operate in medium Earth orbit.
That difference affects how quickly satellites move across the sky, the signal path to a receiver and the geometry available for measurements. Xona also describes Pulsar signals as stronger and wider-bandwidth than traditional GNSS signals, and says its system authenticates navigation data and ranging signals. These are design goals and company claims, not proof that a complete operational constellation is already providing a particular result everywhere.
Recommended Free Tools
Pulsar is therefore best understood as a planned PNT constellation that may work alongside existing GNSS—not as a replacement already available for ordinary receivers to use worldwide.
#1 Best Overall
- Bright, high-resolution 5” glass capacitive touchscreen display lets you easily view your route
- Get more situational awareness with alerts for school zones, speed changes, sharp curves and more
- View food, fuel and rest areas along your active route, and see upcoming cities and milestones
- View Tripadvisor traveler ratings for top-rated restaurants, hotels and attractions to help you make the most of road trips
- Directory of U.S. national parks simplifies navigation to entrances, visitor centers and landmarks within the parks
How a receiver turns satellite signals into a position
1. Satellites broadcast timed signals
Pulsar’s planned service uses two signal bands called X1 and X5. Xona describes them as adjacent to GPS L1 and L5, with a design intended to coexist with existing GNSS and fit compatible receiver hardware. A satellite’s transmission carries information that helps a receiver identify the signal and relate its measurements to the satellite’s orbit and clock state.
2. The receiver measures arrival time and signal behavior
A receiver searches for signals it can see, identifies and tracks them, and measures properties including arrival time, carrier phase and Doppler shift. The time a signal takes to travel from satellite to receiver provides a range-like measurement: the receiver compares the signal’s observed arrival with its transmitted timing. The result is not a perfect distance by itself, because the receiver’s own clock is not assumed to be synchronized with the satellite clocks.
In a simplified positioning model, each satellite supplies a measurement related to the distance between that satellite and the receiver. The receiver combines measurements from multiple satellites, whose positions and clock information are known or estimated, to solve for its own position and clock offset. More satellites and useful geometric diversity can make the solution more robust, but visibility, signal quality, receiver design and the accuracy of satellite-state information all matter.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →3. The receiver combines measurements into position and time
Signals on different bands and measurements of different types can contribute distinct information. Pseudorange measurements provide a basic range estimate; carrier-phase measurements track the phase of the radio wave and can support much finer measurements when the receiver can maintain a reliable lock and resolve ambiguities. Doppler measurements describe the apparent frequency shift caused in part by relative motion, supporting tracking and navigation calculations.
The receiver does not simply read a latitude and longitude from one satellite. It uses the set of measurements, together with satellite orbit and clock data, to estimate a position and time that fit them. A real implementation must also account for measurement errors and conditions such as blocked signals, reflections, receiver-clock error and satellite visibility.
Rank #2
- 6” high-resolution navigator includes map updates of North America
- Hands-free calling when paired with your compatible smartphone with BLUETOOTH technology and convenient Garmin voice assist lets you ask for directions to places you want to go
- Road trip–ready features include the HISTORY database of notable sites, a U.S. national parks directory, Tripadvisor traveler ratings and millions of Foursquare POIs
- Driver alerts for things such as school zones, sharp curves and speed changes help encourage safer driving and increase situational awareness
- Access live traffic, fuel prices, parking, weather and smart notifications when you pair this navigator with your compatible smartphone running the Garmin Drive app
Why low Earth orbit changes the measurement geometry
Xona says Pulsar satellites are about 20 times closer to Earth than traditional GNSS satellites. Because a LEO satellite moves quickly relative to a user on the ground, it also passes through the user’s view faster. Xona’s April 2026 technical article says a Pulsar satellite crosses the view in about ten minutes.
For a receiver, this means the satellites contributing measurements can change more rapidly than in a traditional MEO-only geometry. Xona argues that the faster-changing geometry supplies diverse measurements sooner and can help distinguish a direct signal from reflected copies. A reflected signal can travel farther than the direct path, so treating it as if it arrived directly can distort a range estimate. The benefit is not automatic: it depends on which satellites are visible, how the receiver processes signals, and the surroundings.
LEO is not simply “better” in every respect. Faster satellite motion means the system must account for changing satellite positions and signal conditions, while a single satellite’s view is relatively brief. The useful comparison is how a complete system handles geometry, signal tracking, coverage and satellite-state information—not orbit altitude alone.
What Xona says is different about Pulsar’s signals and architecture
Signal power and bandwidth
Xona says higher received signal power and wider bandwidth are intended to improve pseudorange and carrier-phase measurements, and to help a receiver keep tracking when signals are obstructed or affected by multipath. Stronger signals may also be useful in environments where satellite reception is difficult. These are company-stated benefits; actual performance depends on the receiver, the environment, visible satellites and whether the service is available.
The signal design is intended to coexist with existing GNSS and use X1 and X5 bands adjacent to GPS L1 and L5. That is a compatibility objective, not a guarantee that every receiver designed for L1 or L5 can track Pulsar. Receiver firmware and signal-processing support still have to be in place.
Rank #3
- Explore confidently with the reliable handheld GPS
- 2.2” sunlight-readable color display with 240 x 320 display pixels for improved readability
- Preloaded with Topo Active maps with routable roads and trails for cycling and hiking
- Support for GPS and GLONASS satellite systems allows for tracking in more challenging environments than GPS alone
- 8 GB of internal memory for map downloads plus a micro SD card slot
Satellite orbit and clock estimates
Xona describes each satellite as using orbit propagation, onboard modeling and intersatellite ranging to estimate its own position and clock state in orbit. The stated purpose is to reduce reliance on downstream ground corrections for precision. In practical terms, a receiver needs usable information about where a transmitting satellite was and what its clock was doing at the time of transmission; improving that information can improve the usefulness of its range measurements.
Free tools Windows power users keep installed
One-click scans. No signup required.
This is Xona’s account of its architecture. It should not be confused with an independently established description of performance for a fully deployed constellation. The receiver still needs valid satellite data and enough usable signals to form a position solution.
Authentication and its limit
Xona describes a constellation-wide, TESLA-based authentication approach for navigation data and ranging signals. The company says it is designed to work without an internet connection and targets authentication in four seconds. Authentication can help a receiver check that navigation information and ranging signals are genuine, which is relevant to resistance against counterfeit or spoofed signals.
Authentication does not prove that a signal arrived by the shortest path or at the correct time. Xona explicitly notes that delay attacks remain possible: cryptography cannot by itself stop an attacker from delaying a genuine signal. Authentication therefore addresses signal trust, not every threat to ranging accuracy or availability.
What performance figures do—and do not—show
Xona’s current product page lists the specifications below. They are vendor-stated figures, not independently verified outcomes for every receiver, location or operating condition. The page does not establish that these results are currently available as a public, continuous service from a complete constellation.
Rank #4
- 8” navigator with high-resolution, dual-orientation display and map updates of North America .Special Feature:Large Display; Voice Assist; Hands-Free Calling; Live Traffic and Weather; Traffic Cams and Parking; Smart Notifications,Driver Alerts; Tripadvisor; National Parks Directory; Find Places by Name; Garmin Real Directions Feature.
- Hands-free calling when paired with your compatible smartphone with BLUETOOTH technology and convenient Garmin voice assist lets you ask for directions to places you want to go
- Road trip–ready features include the HISTORY database of notable sites, a U.S. national parks directory, Tripadvisor traveler ratings and millions of Foursquare POIs
- Driver alerts for things such as school zones, sharp curves and speed changes help encourage safer driving and increase situational awareness
- Access live traffic, fuel prices, weather, parking and smart notifications when you pair this navigator with your compatible smartphone running the Garmin Drive app
| Figure | What the source says | How to interpret it |
|---|---|---|
| 2 cm horizontal, 4 cm vertical position accuracy | Xona Space Systems’ current product page, accessed in 2026 | Vendor-stated specification; conditions and universal operational results are not established here. |
| Timing under 10 ns | Xona Space Systems’ current product page, accessed in 2026 | Vendor-stated specification, not an independent result for all users or operating conditions. |
| Near-instantaneous convergence to 25 cm | Xona Space Systems’ current product page, accessed in 2026 | Vendor-stated specification; the page’s figure should not be treated as a guarantee for every receiver or environment. |
| Signal power up to -136 dBW; 100 times GPS L1 C/A signal strength | Xona Space Systems’ current product page, accessed in 2026 | Vendor-stated signal figures; they do not by themselves establish position accuracy or real-world availability. |
A narrower independent data point comes from an Institute of Navigation GNSS+ 2025 paper abstract. In simulated scenarios, the authors’ reconfigurable receiver supported sub-meter horizontal accuracy, including a blended GPS/Pulsar test with injected GPS L1 jamming. In a live-sky Pulsar-0 experiment, the authors reported Pulsar X1 carrier-to-noise ratios 12 to 22 dB above the GPS L1 signals tracked in that experiment. Those results describe the stated test conditions, not performance from a complete operational constellation.
Accuracy figures are meaningful only alongside their conditions. A claimed centimeter-level position result is different from a demonstration that a signal can be acquired, or a simulated receiver result under a specific scenario. Satellite visibility, signal obstructions, receiver implementation and the availability of reliable satellite orbit and clock information all affect what a user can obtain.
What is operating now, and what remains planned
Xona announced that Pulsar-0 entered orbit aboard Transporter-14 in June 2025. The company described it as a technology-validation and live-sky-testing mission, and said it launched without propulsion—a trade-off that reduced planned mission capability and lifetime. Pulsar-0 is a test satellite, not a complete constellation capable of providing continuous global service.
Xona’s overview says Pulsar-0 signals are being received and tested across parts of the United States and Canada. Xona describes a planned constellation of approximately 300 satellites, while a Canadian Space Agency article from June 2025 described a plan to scale beyond 250 satellites. These are different descriptions of future plans; neither means those satellites are already in orbit. Xona has described full constellation service as planned over the next few years, but that schedule is a plan rather than confirmation of a deployment date or current global coverage.
Can existing GNSS receivers use Pulsar?
Xona says Pulsar is intended for GNSS receivers using L1 or L5, and that many existing receivers may be able to ingest Pulsar signals after firmware updates. Its technical article also says existing antennas and front-end components can often remain in place. This could reduce the hardware changes needed for some equipment, but it does not establish compatibility for every L1/L5 receiver.
Best Value
- Bright, high-resolution 5” glass capacitive touchscreen display lets you easily view your route
- Get more situational awareness with alerts for school zones, speed changes, sharp curves and more
- View food, fuel and rest areas along your active route, and see upcoming cities and milestones
- View Tripadvisor traveler ratings for top-rated restaurants, hotels and attractions to help you make the most of road trips
- Directory of U.S. national parks simplifies navigation to entrances, visitor centers and landmarks within the parks
No complete current retail model list is established by the available information. Before recommending or buying a receiver for Pulsar, check the receiver maker’s current firmware notes and service-support information, and confirm that Pulsar signal processing is supported for the exact model. A device that can receive energy in a frequency band is not necessarily capable of decoding and using a particular navigation signal.
How to evaluate Pulsar against GPS or another PNT option
A useful comparison separates the architecture from evidence of present-day performance. Ask these questions rather than relying on a single accuracy figure:
- Orbit and geometry: Is the system using LEO or MEO satellites, and how does satellite motion affect the measurements available to a receiver?
- Signal and receiver support: Which signals can the receiver track, what firmware is required, and can existing antennas and front-end hardware be retained?
- Evidence behind accuracy claims: Is a number a vendor specification, a simulation, a limited live-sky test or a measured service result—and under what conditions?
- Availability: Is the receiver seeing a test satellite, a regional service or a deployed constellation providing the coverage the user needs?
- Resilience and security: What do signal strength and authentication address, and which risks—such as deliberate signal delay—remain?
- Operational dependencies: Does the solution require compatible firmware, correction data, a service relationship or other infrastructure?
Xona presents Pulsar as designed to work alongside existing GNSS. Its onboard orbit and clock estimation is intended to move some estimation work onto the satellites, rather than relying as heavily on downstream ground corrections. Those architectural aims should be assessed separately from the current state of deployment and from the performance a particular receiver can achieve.
What to watch as Pulsar develops
For a user deciding whether Pulsar is relevant now, the practical milestones are not just satellite counts. The important questions are whether compatible receivers and firmware are identified, whether service access is available in the user’s region, what operating conditions accompany any published accuracy result, and whether coverage is continuous enough for the intended application.
The Canadian Space Agency’s June 2025 article framed the project’s ambition in terms of fine-grained positioning. That aspiration is not the same as a demonstrated capability for a particular user or location. Until a broader service is deployed and independently characterized, distinguish the planned system’s design goals, the Pulsar-0 tests and any future operational service.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
