Surveypod - Blog #accuracy

How many Satellites and Channels require in your DGNSS?

Tue, 10 Jun 2025 11:03:37 +0000

In the realm of precision navigation and positioning, Differential GNSS (DGNSS) often emerges as a critical yet misunderstood technology. Despite its pivotal role in enhancing GPS accuracy, several myths persist, clouding its true value. Today, let’s discuss some common misconception in the survey world related to DGNSS (or DGPS).

You may have heard people emphasize the importance of having 400, 800, or even 1200 channels in a DGNSS receiver. Have you ever thought deeper to understand what this actually means? Let’s clarify this with some simple mathematical calculations.

There are a total of 120 operational satellites: GPS (31), Galileo (24), GLONASS (24), BeiDou (30), NavIC (7), and QZSS (4). These satellites are distributed across the orbital plane and are not all visible from a particular point on Earth.

What is an Elevation Mask?

An elevation mask is a threshold angle that defines the minimum elevation above the horizon that a satellite must have to be considered in the positioning calculations of a DGNSS receiver. The purpose of this mask is to filter out low-angle satellite signals that are more likely to be degraded by atmospheric interference, multipath effects, and obstructions.

What value to keep for Elevation Mask?

It is recommended to set the Elevation Mask to 15 degrees to use only high-quality satellites for positioning. However, even with an Elevation Mask set to 5 degrees, you wouldn’t be able to see even half of the satellites simultaneously.

How many satellites with Elevation Mask as 5 degrees?

With an Elevation Mask of 5 degrees, you would only be able to track a maximum of 14 GPS, 6 Galileo, 6 GLONASS, 11 BeiDou, and 4 QZSS satellites. Out of the 7 NavIC satellites, only 5 are operational, and many companies do not support NavIC.

So how many Channels?

Now, let’s talk about channels. The L1 and L2 bands require only one channel each, whereas the L5 band requires two channels. Interestingly, out of the 120 satellites, only 40–45 have L5 bands.

Here’s the mathematical calculation with a 5-degree Elevation Mask (in general, if you set it to 15 degrees, which is the industry standard, the number would be lower):

Total satellites being used: 14 (GPS) + 6 (Galileo) + 6 (GLONASS) + 11 (BeiDou) + 4 (QZSS) + 5 (NavIC) = 46 satellites. Not all of these would have L5 bands; let’s assume 20 do.

So, the total number of channels required would be: 46*1 (L1) + 46*1 (L2) + 20*2 (L5) = 132 channels. In reality, this is still an exaggerated number. In the real world, no more than 100 channels are typically required. Claims of needing 400, 800, or even 1200 channels are overly futuristic and marketing/selling strategy. It will take more than 10–15 years to even approach the utilization of 300 channels.

Does All Satellites Used in DGNSS Provide the Same Level of Accuracy?

The accuracy of signals from GNSS satellites can vary due to several factors, including the satellite’s position, health, and atmospheric conditions affecting the signal’s travel to Earth. Differential GNSS (DGNSS) enhances overall accuracy by correcting these variable errors. However, the effectiveness of DGNSS corrections is influenced by the quality of the correction data, which depends on the proximity and condition of the reference station, as well as the quality of the communication link between the reference station and the DGNSS receiver. Therefore, it is crucial to closely examine the quality of the satellites being used for positioning.

About SurveyGyaan

SurveyGyaan is an educational initiative under the Surveyaan brand, which is a subsidiary of Nibrus Technologies Private Limited. Surveyaan specializes in drone manufacturing and the development of photogrammetry software. Surveypod specializes in DGNSS manufacturing with tilt gnss and non tilt gnss options.

Surveypod (Indian DGNSS(Dgps) Manufacturers): www.sur veypod.in

Surveyaan (Indian Drone Manufacturers): www.surveyaan.com

Surveyaan GeoWorkspace (Photogrammetry Software): app.surveyaan.com

DGNSS Series - CORS Network

Tue, 10 Jun 2025 10:23:19 +0000

The way we monitor locations and travel on Earth has been completely transformed by global navigation satellite systems, or GNSS. These satellite constellations, which include GPS and Galileo, supply critical position data for a wide range of uses, from precise timing in financial transactions to automobile navigation systems. But in order to guarantee the highest level of location accuracy, obstacles including atmospheric delays and signal blockages must be overcome. Nowadays, the Continuous Operating Reference Station (CORS) networks positioning services are amongst the most used ones when the highest positioning accuracy is needed.

Idea behind CORS Network

In most of GNSS applications where precise positioning is required, users usually pair their GNSS instruments with other GNSS instruments, simultaneously observing one or more known position, termed as reference station, and with help of these reference stations estimated corrections to be applied over point of interest or rover position are obtained through Static GNSS Survey or Real Time-Kinematic (RTK) Survey methods.

To liberate users from setting of their own reference station each time they wish to undertake GNSS measurement, Continuously Operating Reference Stations (CORS) has been established, which are not only capable of providing Real Time Positioning Service through RTK/NRTK with an accuracy of ±3cm, but also host an array of different positioning services targeted to cater requirements for different segments of Geospatial and scientific Community.

What is CORS Network?

CORS networks are permanently installed reference stations strategically positioned across a geographic region. These stations are equipped with high-precision GPS receivers and antennas that continuously collect and process GPS data to calculate position corrections. These corrections account for various factors that can affect signal accuracy, such as ionospheric and tropospheric delays, satellite orbit errors, and multipath interference. The data is then transmitted to a central processing facility where it is used to provide real-time, accurate positioning information for a variety of applications.

Characteristics of CORS Network

The CORS network is available 24 hours per day, 7 days a week and 365 days a year.
CORS stations are strategically distributed across a geographic region to provide comprehensive coverage.
The CORS network is a multi-purpose collaboration between government, academic, and corporate institutions. The sites are independently owned and operated.
CORS networks support multiple GNSS constellations, including GPS, GLONASS, Galileo, and BeiDou.
It is typically used to support a wide range of applications, including surveying and mapping, construction, transportation, and other industries.
Many CORS networks provide open access to their data, allowing users from various sectors to utilize positioning information for diverse applications.

CORS in INDIA

India has been actively developing and deploying its own CORS (Continuously Operating Reference Stations) network in conjunction with its regional satellite navigation system called NavIC (Navigation with Indian Constellation). NavIC, also known as the Indian Regional Navigation Satellite System (IRNSS), is a constellation of satellites developed by the Indian Space Research Organisation (ISRO) to provide accurate positioning and timing services over the Indian region and surrounding areas.

How CORS network function in India using NavIC?

India has been establishing a network of CORS stations across the country.
These CORS stations are equipped with high-precision GNSS receivers and antennas, allowing them to continuously monitor signals from both the NavIC satellites and other GNSS constellations such as GPS.
The CORS stations collect raw GNSS measurements and transmit them to a central processing facility. At this facility, the raw data is processed using precise algorithms to compute corrections and augmentations for improving the accuracy of GNSS positioning.
Since NavIC is India’s regional satellite navigation system, the CORS network integrates NavIC signals into its positioning solutions. This integration enhances the accuracy and availability of positioning data, especially in areas where NavIC signals have better visibility than signals from other GNSS constellations.

The corrected GNSS data, including NavIC-based corrections, is made available to users in real-time through various means such as the internet, satellite communication, or radio links. This allows users to access accurate positioning information for their applications, including surveying, mapping, agriculture, transportation, and disaster management.

CORS Network in India — Present

There are two types of Service being made available by SoI:

1. Real Time Positioning Services (RTPS)

Network RTK Services for 3–4 centimeter real time positioning.
D-GNSS Services for 30–40 centimeter accurate real time positioning.

2. Reference Data Services (RDS)

Online Data processing of static observation with respect of CORS.
Downloading of RAW Data of CORS Stations for processing in user software.

For more precise or scientific applications users can download CORS stations raw observations in non proprietary open RINEX format or virtual rinex data (i.e. RINEX files for a virtual reference station that can then be used for post processing calculations), and use it to process his own GNSS data it his own software.

For accessing all these services users are required to get registered themselves on Survey of India CORS web site, i.e. http://www.cors.surveofindia.gov.in

About SurveyGyaan

Surveypod (Indian DGNSS(Dgps) Manufacturers): www.sur veypod.in

Surveyaan (Indian Drone Manufacturers): www.surveyaan.com

Surveyaan GeoWorkspace (Photogrammetry Software): app.surveyaan.com

DGNSS Series-Real Time Kinematic (RTK) and Post Processing Kinematic (PPK)

Tue, 10 Jun 2025 10:09:12 +0000

Global Navigation Satellite System (GNSS) technology has transformed how we navigate and collect location-based data. Real-Time Kinematic (RTK) and Post-Processing Kinematic (PPK) are two cutting-edge methodologies that have greatly improved the accuracy and dependability of GNSS data. In this blog article, we’ll look at the concepts, uses, and benefits of RTK and PPK GNSS technology.

RTK and PPK are techniques used to enhance the accuracy of GNSS measurements:

Real Time Kinematics

This form of measurement occurs when we have a GNSS base that communicates directly with the GNSS rover and delivers corrections via radio transmission. In this approach, both the base and the rover get signals from the same satellites and through this direct radio link the corrections are transmitted in real time, achieving a high accuracy in the same field of data capture.

Pros of Real Time Kinematics

Accuracy: RTK GNSS offers centimeter-level precision, making it ideal for applications requiring accurate location, such as surveying, construction, and agriculture.
Real-Time Corrections: RTK applies corrections to the GNSS signal in real time, allowing users to acquire precise location data in a fraction of seconds. This capability is especially useful for applications requiring fast input or change, such as machine control in construction.
Increased Efficiency: RTK technology allows for quicker data collecting and decision-making processes, which improves efficiency in a variety of applications. Surveyors, for example, may conduct fieldwork more rapidly with RTK, resulting in shorter project schedules.
Versatility: RTK GNSS may be used in a wide range of settings and situations, from metropolitan regions with tall structures to broad open fields. Its adaptability makes it appropriate.

Cons of Real Time Kinematics

Line-of-Sight Requirements: RTK GNSS requires a clear line of sight between the receiver and the satellites. Signal barriers, such as buildings, trees, or topography, might reduce performance and accuracy.
Reliance on Base Station: RTK systems rely on a nearby base station to send correction data to the rover receiver. This reliance restricts the range of operation and may be impractical in distant or inaccessible places without a network of base stations.
Vulnerability to Signal Interference: RTK GNSS signals are vulnerable to interference from sources such as electromagnetic interference (EMI), multipath reflections, and atmospheric conditions. Interference can impair signal reception and reduce accuracy, particularly in urban or industrial settings.
Infrastructure costs: Setting up and maintaining RTK infrastructure, including base stations and communication networks, may be expensive, especially for large-scale projects or businesses with several locations. Furthermore, continuous subscription costs for correction services may increase the overall cost of RTK GNSS use.

Post Processing Kinematics

PPK is an alternative to RTK that applies positional corrections retrospectively. This means that in PPK mode, the GNSS rover and GNSS base station do not need to be connected when functioning. You simply need to record raw GNSS data (logs), which are subsequently processed to produce accurate positioning data that may be utilized for computations in postprocessing.

Post-Processing Kinematic (PPK) GNSS technology offers unique advantages.

Pros of Post Processing Kinematics

High Accuracy: Similar to RTK, PPK GNSS provides centimeter-level accuracy, ensuring precise positioning data for various applications such as surveying, mapping, and asset management.
Flexibility in Data Collection: PPK technology allows users to collect GNSS data without the need for a real-time correction source or continuous communication with a base station. This flexibility is advantageous in remote or challenging environments where real-time corrections may not be available.
Cost savings: With PPK GNSS, there are no continuing subscription fees or infrastructure expenditures connected with real-time correction services. This can result in cost savings over time, particularly for firms that do regular or large-scale GNSS surveys.

Cons of Post Processing Kinematics

Delayed Results: Unlike RTK, which gives real-time positioning data, PPK GNSS requires gathered data to be post-processed in order to make corrections and obtain precise results. Depending on the processing procedure and software utilized, this could cause delays in receiving final positioning data.
Post-processing Complexity: To use PPK GNSS, users must acquire raw GNSS data in the field and process it using specific software or algorithms. This procedure can be difficult and may necessitate training or experience to provide correct findings.
Limited Real-Time Feedback: Without real-time corrections, users cannot discover and correct positional errors or anomalies during data gathering with PPK GNSS. Additional field checks or validation procedures may be required to verify data quality before results are finalized.

RTK and PPK GNSS technologies have transformed the landscape of precise positioning, enabling a wide range of industries to achieve unprecedented levels of accuracy in their location-based applications. As advancements in GNSS technology continue, the future holds even greater promise for enhanced accuracy and efficiency across diverse industries.

This brings us to the end of the blog. I hope this article gained some knowledge for you!

Please find the video on our YouTube channel from here.

Thank you for reading.

About SurveyGyaan

Surveypod (Indian DGNSS(Dgps) Manufacturers): www.sur veypod.in

Surveyaan (Indian Drone Manufacturers): www.surveyaan.com

Surveyaan GeoWorkspace (Photogrammetry Software): app.surveyaan.com

Errors in GNSS

Tue, 10 Jun 2025 06:56:56 +0000

Global Navigation Satellite Systems (GNSS) such as GPS, GLONASS, and Galileo are critical in providing accurate location information for a variety of applications ranging from navigation and surveying to agricultural and emergency services. However, the precision of GNSS positioning is susceptible to a variety of faults that can jeopardize the dependability of location data. In this blog article, we will look at various forms of GNSS errors and how they affect accuracy.

These are the factors that may make it difficult for a GNSS receiver to calculate an exact position and degrade precision.

Satellite Clock Errors

GNSS satellites are equipped with atomic clocks to provide precise timing signals.

However, variations in the satellite clocks can introduce errors in the ranging measurements, affecting the accuracy of position calculations. Different global systems use different types of atomic clocks, and most satellites will have multiple types of clocks on board. For e.g. Rubidium and Caesium are standard on GPS , Galileo has Hydrogen maser and Rubidium.

These clocks are incredibly accurate, but they aren’t perfect, and experience ‘drift’. This means they lose or gain one nanosecond for every three hours of time.

For example, 10 nanoseconds of clock error results in 3 meters of position error.

Orbit Errors

GNSS satellites travel in very precise, well-known orbits. However, like the satellite clock, the orbits do vary a small amount. Also, like the satellite clocks, a small variation in the orbit results in a significant error in the position calculated.

Orbital errors occur when the GNSS satellite is not exactly in the position that was predicted and transmitted through orbit data. Some GNSS surveying techniques require the final ephemerides to be used to guarantee the best solution for a position.

This error source can be reduced by means of relative measurement, or by post-processing when observed and post-processed orbit data of good quality are available.

Ionospheric Delay

The ionosphere is the layer of atmosphere between 50 and 1,000 km above the Earth. This layer contains electrically charged particles called ions due to solar radiation. These ions alter the transmission time of the satellite signals and can cause a significant amount of satellite position error (typically ±5 meters). Modelling the ionosphere is highly variable and more difficult to model. This is generally the largest error source in GNSS measurement, but it can be reduced by using relative or multi-frequency measurement.

Tropospheric Delay

The troposphere is the layer of atmosphere closest to the surface of the Earth. It is approximately 8 and 14 km deep, depending on the location on the Earth’s surface. Tropospheric errors are caused by temperature, density, pressure or humidity changes.. Here, the GNSS signal is mainly affected by water vapour, which varies is a lot in time and space.

Multipath

Multipath error occurs when a signal from the same satellite reaches a GNSS antenna via two or more paths, such as reflected off the wall of a building. The reflected signal clearly has to travel further to reach the antenna and so it arrives with a slight delay. In an environment with tall houses or trees, multipath errors are more common. This error source can be partially reduced by observing over a longer period and with good quality GNSS equipment. Also, to reduce multipath errors place the GNSS antenna in a location that is away from the reflective surface.

Receiver Noise

Receiver noise refers to the position error caused by the GNSS receiver hardware and software. All GNSS receivers are subject to other radio waves that occur naturally or through other processes. These other radio waves, along with other types of electrical interference are what is known as background noise, and impact the ability of the receiver to ‘hear’ the GNSS signals. High-end GNSS receivers tend to have less receiver noise than lower-cost GNSS receivers. Calibration and signal processing techniques are employed to minimize these errors, but they can still impact accuracy.

Impact on Accuracy

Positional Inaccuracy: Cumulative effects of the mentioned errors can lead to significant inaccuracies in the calculated position. This is particularly critical in applications where precise positioning is essential, such as in aviation, surveying, and autonomous vehicles.
Time-to-First-Fix: Errors can also impact the time it takes for a GNSS receiver to acquire the first fix. In scenarios where rapid and accurate positioning is crucial, delays in acquiring a fix can have serious consequences.
Navigational Integrity: In safety-critical applications, like aviation, GNSS errors can compromise the navigational integrity of the system. This is why redundancy and augmentation systems are often used to enhance accuracy and reliability.
Increased Uncertainty: Users relying on GNSS for navigation or surveying may experience increased uncertainty in their results. This uncertainty can be a limiting factor in applications where precision is paramount.

While GNSS has revolutionized navigation and positioning, understanding and mitigating errors are crucial for ensuring accuracy. Users should be aware of the various error sources and employ techniques such as differential corrections, augmentation systems and the use of multiple constellations to enhance GNSS performance

This brings us to the end of the blog. I hope this article gained some knowledge for you!

Please find the video on our YouTube channel from here.

Thank ou for reading.

About SurveyGyaan

Surveypod (Indian DGNSS(Dgps) Manufacturers): www.sur veypod.in

Surveyaan (Indian Drone Manufacturers): www.surveyaan.com

Surveyaan GeoWorkspace (Photogrammetry Software): app.surveyaan.com

DGNSS Series- Satellite Constellations

Fri, 06 Jun 2025 10:45:07 +0000

At the heart of GNSS are the satellite constellations, intricate networks of orbiting satellites that work in harmony to provide precise location data. In this blog, we’ll take a closer look at the major GNSS satellite constellations, exploring their features, functions, and the global impact of these constellations.

Several other countries have developed comparable GNSS constellations since the United States deployed the first operational global navigation satellite system i.e., GPS(Global Positioning System).

There are also various GNSS constellations in use around the world which include GLONASS (Global Navigation Satellite System) developed by Russia, GALILEO (Europe’s Satellite Navigation System), China’s BEI-DOU, India’s Regional Navigation Satellite System (IRNSS or NavIC) and Japan’s Quasi-Zenith Satellite System (QZSS).

The main reason for all 5 satellite constellations is availability and redundancy. If one system fails, another GNSS constellation can help take over.

GPS (United States)

It was the first fully operational GNSS and remains one of the most widely used globally. It has typically 31 operational satellites. It was created as an independent military navigation system by the Department of Defense (DoD). Before it was made public, great effort was invested into providing high accuracy as well as making it secure against jamming and spoofing attempts. GPS uses the L-Band frequency range of 1176.45 to 1575.42 MHz.

GLONASS

Russia’s Global Navigation Satellite System (GLONASS) is the second navigational system in operation with global coverage and of comparable precision to GPS. GLONASS is operated by the Russian government and became fully operational in 1995. The fully operational system consists of 24+ satellites. It operates in the frequency from 1202.026 to 1600.995 MHz (G1/G2) . In standalone applications, GLONASS doesn’t provide as strong of signal compared to GPS but is a great alternative/backup for GPS. Over the past ten years, Russia began replacing its second-generation GLONASS-M satellites with the more modern GLONASS-K design.

GALILEO

GALILEO is Europe’s GNSS system that is compatible with GPS and GLONASS. It was created by the European Union through the European Space Agency. It operates with 28 satellites. GALILEO provides 3 services

Open Access Service: It delivers meter-scale accuracy to the public.
Public Regulated Service: It delivers centimeter-scale accuracy to authorized users.
Search-and-Rescue (SAR): It relays distress messages to European ground stations.

In early 2023, Galileo’s High Accuracy Service became operational. With sub-meter accuracy in Europe, the new service will support drone navigation, precision agriculture, and other applications. Once the full service goes into effect in 2024, receivers in Europe will get better performance and faster convergence times.

GALILEO operates at a frequency from 1176.45 to 1575.42 MHz (E1/E5a).

BEIDOU

BeiDou is the Chinese satellite navigation system, operated by the Chinese National Space Administration (CNSA).

The first generation was called BeiDou-1 and was mainly used by China and neighboring regions.

The 2nd generation called the BeiDou-2 has been in use since 2012 which serve users in the entire Asia-Pacific region.

The latest generation called BeiDou-3 has 35 satellites with the last one being launched on 23 June 2020 and will serve users all over the world.

Characteristics

BDS possesses the following characteristics:

Its space segment is a hybrid constellation consisting of satellites in three kinds of orbits. BDS operates more satellites in high orbits to offer better anti-shielding capabilities, which is particularly observable in terms of performance in the low-latitude areas.
BDS provides navigation signals of multiple frequencies, and is able to improve service accuracy by using combined multi-frequency signals.
BDS integrates navigation and communication function, and possesses multiple service capabilities, namely, positioning, navigation and timing, short message communication, international search and rescue, satellite-based augmentation, ground augmentation and precise point positioning, etc.

In addition to these there are also regional satellite systems that contribute to the overall GNSS network.

The latest generation called BeiDou-3 has 35 satellites with the last one being launched on 23 June 2020 and will serve users all over the world.

IRNSS/NavIC

The Indian Regional Navigation Satellite System (IRNSS), with an operational name of NavIC (Navigation with Indian Constellation), is an independent regional navigation satellite system. It is developed by Indian Space Research Organization (ISRO). It provides real-time positioning and timing services. It covers India and a region extending 1500 km around it.

IRNSS will provide two types of services, namely,

Standard Positioning Service (SPS): It is provided to all the users and
Restricted Service (RS): It is an encrypted service provided only to the authorized users

It consists of 7 satellites that have been in orbit since 2018 and operates at a frequency from 1176.45 to 2492.028 MHz.

QZSS

The Quasi-Zenith Satellite System, or QZSS, is a satellite navigation system from Japan. It is designed and operated by Japan Aerospace Exploration Agency (JAXA). It was launched to complement existing global navigation satellite systems, such as GPS. QZSS operates in the frequency from 1176.45 to 1575.42 MHz. It is compatible with GPS and ensures a sufficient number of satellites for stable, high-precision positioning over Japan and in the Asia-Oceania region.

The evolution and expansion of GNSS satellite constellations have transformed the way we navigate and interact with the world. Whether guiding a ship through open waters, ensuring the timely arrival of a package, or supporting emergency responders in times of crisis, GNSS satellite constellations are the unsung heroes navigating our modern world.

This brings us to the end of the blog. I hope this article gained some knowledge for you!

Please find the video on our YouTube channel from here.

Thank you for reading.

About SurveyGyaan

Surveyaan: www.surveyaan.com

Surveyaan GeoWorkspace: app.surveyaan.com

DGNSS Series- Introduction

Fri, 06 Jun 2025 09:54:42 +0000

In the ever-evolving landscape of technology, precision is paramount, especially when it comes to location-based services. This blog series delves into the world of Differential Global Navigation Satellite Systems (DGNSS). In this inaugural post, we will unravel the diverse domains where accuracy is not just a preference but an absolute necessity and also take you on a journey into the cosmos of GNSS.

Applications

Surveying and Mapping

In the world of surveying and mapping, accuracy is indispensable for creating reliable and detailed spatial representations.
Accurate land surveying is essential for a variety of purposes, such as determining property boundaries, creating topographic maps, and supporting the construction of buildings and infrastructure.

Navigation

It helps in ensuring safe navigation, particularly in congested or hazardous locations.
Display real-world scenarios in which precise location is a nautical requirement.

Precision Agriculture

Transforming agriculture by providing precise planting, fertilization, and harvesting.
Illustrate the impact of accuracy on resource optimization, cost reduction, and increased crop yields.

Aviation

Accurate navigation is essential for safe takeoffs, landings, and en route operations in aviation.
Highlight instances where even minor deviations can pose serious risks, underlining the importance of accuracy.

Emergency Response and Public Safety

Examine the vital role of accurate location data in emergency situations, such as natural disasters or accidents.
Showcase how accurate location data can significantly improve response times and aid in effective crisis management.

Since now we know why accuracy is a very important factor in our daily commutes, let us take a journey into the world of GNSS.

What is GNSS?

A standalone GNSS (Global Navigation Satellite System) is a constellation of satellites that relies exclusively on satellite signals to calculate the user’s position, velocity, and time. It provides signals from space that transmit positioning and timing data to GNSS receivers. The receivers then use this data to determine location.

The most well-known GNSS is the Global Positioning System (GPS), although there are also GLONASS (Russia), Galileo (European Union), and BeiDou (China) satellite navigation systems.

While Global Navigation Satellite Systems (GNSS), such as GPS, provide widespread and reliable positioning information, the limitation of the standalone GNSS is in its accuracy.

Standalone GNSS such as GPS will have an error of 4–5cm with respect to the real-world coordinates. To address this limitation, Differential GNSS (DGNSS) is employed. This can bring the error up to the cm or mm level.

This brings us to the end of the blog. I hope this article gained some knowledge for you!

Please find the video on our YouTube channel from here.

Thank you for reading.

About SurveyGyaan

Surveyaan: www.surveyaan.com

Surveyaan GeoWorkspace: app.surveyaan.com