Systron Donner Inertial (SDI) has released an update to its SDN500 digital quartz MEMS GPS inertial navigation system (GPS/INS).
Introduced in 2011, the SDN500 is a platform extension of SDI’s proven, tactical-grade SDI500 IMU.
The modular, compact, 25 in3 SDN500 provides for maximum packaging flexibility in dense systems and delivers accuracies to within 1.0 mrad in attitude, 0.1 m/s in velocity and 3.9 meters spherical error probability (SEP), the company said.
The SDN500-xE product update provides a newer generation JF2 (C/A) Code GPS receiver and tightly couples the 1 PPS GPS signal to the SDI505 IMU synch pulse to improve heading performance and reduce jitter after long periods of operation without dynamic inputs. The specifications for the updated SDN500-xE will remain the same as the current SDN500-xD INS/GPS device.
The SDN500 offers superior tactical-grade performance integrating SDI’s latest generation quartz gyros capable of 0.5°/hr. bias in-run stability and exceptionally low ARW (0.02°/√ hr.), quartz accelerometers delivering 0.5 milli-g in-run bias stability and low VRW (80 µg/√ Hz.), plus high speed digital signal into a tightly coupled GPS-aided Inertial Navigation System for tactical navigation and geo-location applications.
NovAtel has introduced its SMART7 family of SMART antennas for demanding applications like precision agriculture and machine control.
The SMART7 family features NovAtel’s GNSS + inertial navigation system (INS) SPAN technology; future-ready GNSS; Wi-Fi and internet protocol connectivity; superior tracking performance; and TerraStar-C PRO corrections.
It is ready to increase GNSS availability, accuracy and reliability for major precision-agriculture equipment manufacturers, the company said.
“Manufacturers that serve these demanding industries can now take advantage of the best in precise positioning technology, with added next-generation features including wireless connectivity, SPAN GNSS+INS integration and superior tracking performance, in an even more robust format,” said Gordon Ryley, Precision Agriculture Segment manager at NovAtel. “With this combination of technologies, guidance systems can continue to steer during satellite signal outages and under challenging conditions.”
The SMART7-S includes NovAtel’s tightly coupled SPAN technology, an advanced GNSS+INS integration technology NovAtel said. SPAN provides accurate attitude information that can simplify the development of vehicle guidance systems and bridge GNSS signal outages.
For easier connection to mobile devices and cellular gateways, the SMART7-W includes Wi-Fi and an integrated NTRIP client; the SMART7-I model also incorporates Ethernet. A new advanced ISOBUS-compatible CAN interface also supports NovAtel logs, commands and firmware upgrades.
All models in the SMART7 family provide exceptional positioning availability using signals from all constellations and frequencies to deliver assured positioning anywhere.
Each model includes a VEXXIS antenna, and supports TerraStar-C PRO, the newest offering from TerraStar correction services, which delivers 2.5 centimeters and convergence times of less than 18 minutes in most regions.
Signals other than GNSS are the key to positioning for both the transportation and machine control markets. While many solutions are being developed, inertial navigation systems (INS) are emerging as the primary GNSS co-star.
In our survey, nearly three quarters (72%) of respondents in this sector said positioning could best rely on tight integration between GNSS and INS. For comparison, inertial technology wasn’t even mentioned in the 2017 State of the GNSS Industry Report. This year for the first time, GPS World offered an Inertial Buyers Guide for our readers (see our May issue).
What is the best additional solution for positioning in GPS/GNSS-challenged environments? (Source: GPS World 2018 State of the GNSS Industry survey)
Practical autonomous navigation — the current ambition of automakers (and Google) — hits a roadblock when it comes to uninterrupted positioning. We all know GNSS reception has its limits, notably in many places that vehicles travel such as tunnels, beside tall buildings and in parking garages. Inertial positioning fills that gap, making it especially advantageous for meeting the challenges of autonomous navigation.
Inertial measurement units are generally based on multi-axis combinations of precision gyroscopes, accelerometers and magnetometers using algorithms to determine location, direction and position. Gyroscopes measure the angular velocity; accelerometers measure overall acceleration; and magnetometers provide the direction of the magnetic field.
Micro-electro-mechanical (MEMS) techniques have reduced the size, power consumption and costs of INS systems considerably, enabling their use in ever more applications, including unmanned aerial vehicles.
As a result, products that combine GNSS + INS are being introduced at an increasing rate, with more than a dozen major announcements in the past year. According to one study, the INS market is projected to grow from US$11.89 billion in 2017 to US$19.67 billion by 2023, a compound annual growth rate of 8.76%.
For more results from the 2018 State of the GNSS Industry, see this page.
Xsens has expanded its MTi product portfolio with the introduction of the MTi-7, a miniature inertial navigation system (INS) module that uses input from an external GNSS receiver to provide an accurate, real-time position, velocity and orientation data stream.
The module has a compact 12 x 12-millimeter footprint, weighs less than 1 gram and consumes under 100 milliwatts, making it suitable for use in space- and power-constrained devices such as drones, as well as autonomous or remote-controlled mapping and imaging equipment.
Image: Xsens
Operating at output data rates up to 800 Hz, the MTi-7 achieves very low latency of 2 milliseconds, allowing for real-time operation of dynamic functions such as flight control and camera stabilization, the company said.
The module also offers a position and velocity output suitable for the navigation of autonomous ground vehicles in sectors such as smart farming and robotics.
The high performance of the MTi-7 is due to the advanced sensor fusion algorithms developed by Xsens to synchronize the inputs from the module’s onboard accelerometer, gyroscope and magnetometer with the signals from an external GNSS receiver or barometer.
The raw sensor signals are combined and processed at high speed in the MTi-7 module to produce a real-time data stream showing the device’s horizontal and vertical position, velocity, roll, pitch and yaw. This user-friendly data stream may be supplied to a host processor via a standard I2C, SPI or UART interface.
Based on the design of the successful MTi 1-series, the MTi-7 offers a straightforward upgrade path for current MTi-1 users on the same form factor. It is also able to provide heading, positioning and orientation accuracy more commonly found in much larger, heavier and higher power devices.
Image: Xsens
:We are seeing exploding demand for accurate control of autonomous or computer-guided equipment such as drones and smart farming ground vehicles,” said Hein Beute, director of product marketing at Xsens. “With its tiny footprint, light weight and low power consumption, the MTi-7 provides the industry’s best solution for any such application that is limited in terms of space or power but that needs a high degree of accuracy and precision in position and orientation data.’
The MTi-7 module is supported by an Arduino-compatible development kit (the MTi-7-DK), which provides access to the module’s I2C, SPI and UART interfaces via micro-USB connections.
Developers can configure the operation of the MTi-7 via the freely available Xsens MT Software Suite. The MT Software Suite includes a GUI for PCs operating on the Linux or Windows platforms, as well as a full Software Development Kit including example source codes and complete documentation.
