Nesis

Download booklet in English [10 MB], or a little older version in Portuguese [7 MB] language. Both are in the pdf format. Pre-release of the User's Manual is also available in English [1.8 MB]. Plese note that the manual is slightly behind the current software.

You may also want to download the cutouts for 8.4" or 6.5" version - both in pdf format. You can also get the 3D model of Nesis in STEP format. (Hint: Use right mouse button and select the Save link as command.) 8.4" version and 6.5" version.

Geoniss booklet - a new system for the aerophotography is also available for download [7 MB]. More info on www.geoniss.com.

Table of Contents

1. Screenshoots - Basic Nesis Panels
2. AHRS Background
3. Moving Map, Charts and Flight Planning

1. Screenshoots - Basic Nesis Panels

Hint: Click on the picture to see the true size image.	Basic flight instruments in a combination of classic and modern form: airspeed, altitude, vario, RPM with manifold pressure, artificial horizon, moving map and HSI, engine status panel and fuel computer panel. All these instruments together provide essential information that pilot needs most of the time during the flight.
Large navigation panel provides complete navigation information with heading up moving map, airspaces, vertical airpace cross-section, 5 and 10 min prediction points. It also displays numeric information about current waypoint and route situation like: bearing, tracking, distance, ETA, cross-track error, ... on the bottom bar. The top bar reveals wind, true airspeed, GPS status and local time.
	This panel is dedicated to the engine instruments. All the instruments can be fully configured via a XML file for almost any aircraft. The scales may be displayed in different units (imperial, metric). The picture shows instruments optimized for Rotax 912.
The modern look of the artificial horizon combined with the engine instruments and some flight information labels.
	The menu panel is simply accessible and easy to use. Just select the icon and press the OK button.

2. AHRS Background

The AHRS in the Nesis is a descendant of the Senap autopilot. In fact, Senap electronics was modified for the Nesis instrument. Below are the key features of the system.

• UAV navigation principles are applied - inertial navigation serves as basis navigation which is aided by GPS data. The integration of both worlds is obtained by using Kalman filtering.
• Solid state sensors: 3 axis MEMS accelerometers and angular rates, 3 axis magnetometer, pressures sensors, temperature sensors are used in inertial navigation. The sensor reading is performed at 100 Hz, while attitude and position is calculated at 40 Hz.
• 12 channel GPS aids the inertial navigation unit when the GPS signal is available. Although GPS is not the main source of the navigation it is essential for calibration of inertial navigation results.
• Loss of the GPS signal is tolerated for several minutes without loss of the situation awareness. The inertial navigation does not need GPS signal to calculate current position but it uses GPS merely to compare inertial and GPS solution. In general, the GPS gives better long term position prediction, while inertial navigation gives better short term position prediction. In the case of bad GPS signal, the accumulation of short term prediction errors is still within reasonable limits for several minutes. Once the GPS signal is back, both solutions are merged into one.
• World wide magnetic field declination and inclination model is built into the system in a seamless way. The magnetic declination and inclination is updated automatically.
• Gyro-stabilized magnetic compass. Basic heading information is obtained from integration of the angular rate sensors, which is compared with the magnetic heading solution from the 3-axis magnetometer.
• Rigorous calibration over all temperature range. The bad side of solid state sensors is their sensitivity towards temperature change. Therefore, special care is taken in the sensor calibration process, where each sensor is calibrated over its all range at different temperatures.
• Excellent wind model. No tips and tricks are needed to get correct wind data. Since the wind is used as a state variable in the Kalman filter, the results of wind strength and direction are obtained directly from the filter in a similar manner as attitude and position.

3. Moving Map, Charts and Flight Planning

• World wide chart coverage is based on vmap0 (vector) and SRTM (raster) data. Both data formats are combined in Kanardia's kam format. The kam format follows the idea of KFLog format and divides the world into 1º by 1º coordinate blocks - one file for one block.
• Instantaneous change of zoom levels is obtained using background chart calculation. On the instrument startup, it takes just a few seconds to calculate the first chart and less than one minute to calculate other parallel charts. Once charts are calculated the zoom request is handled in almost no time.
• Nesis has build in support for welt2000, SUA and openair formats for airfields, turnpoints and airspaces.
• Number of airfields, navpoints, waypoints and airspaces is practically unlimited. It is limited only by free space on the on-board computer flash memory.
• Each map can be enhanced with the big HSI (horizontal situation indication) rose, vertical airspace distribution, 5 min and 10 min position prediction, wind situation and direct to waypoint situation. All this information in one screen is all the pilot needs in most cases. Click here to see a sample image with the large HSI.