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RangeFinder - Pointing Device and position detection

DESCRIZIONE

Description
The pointing device and detection positional allows to detect the latitude, longitude and altitude ot the operator; latitude, longitude, corner from North; distance of the target from the operator. The system in addition to Georeferencing, is able to extrapolate ,from the NMEA, deriving from the GPS system, the time GMT in which the operation is carried out.
Once the operator has supervised the target, the system presents the data for the recognition and time on the panel LCD and prepares for the transmission.
The whole system is based on the Helmert Formula for the calculation of the coordinates of the target. These calculations are carried out by the processor in real time and put in a Buffer of type FIFO.
The records may be sent to central operations in RF.
The system can be adjusted to the needs of the customer.
The system can send entries in different modes selectable from menu:
  • Streaming: Transmission every second.
  • One Shot: Transmission of all the observations in the buffer via a single command
  • Silence: No transmission. When the mission is over the operator returnes to the base and downloads the entire buffer via serial connection

Principles of the formula for helmert
From a geometrical point of view, the wgs84 is a conventional terrestrial system (CTS), or a Cartesian system used to describe the earth, whose features are:
  • centre: in the center of mass of the earth
  • axis Z: Passing through the North Pole, as defined by BIH in 1984.
  • axis X: Passing through the Greenwich meridian, as defined by BiH in 1984
  • axis Y: TERNA Right-Handed, so that an observer placed along the axis Z see the X axis duplicate Y in anticlockwise motion, which poses Y in Asia.
The illustration shows the origin and the geometric plans

Trasformation Datum
Il WGS84 utilizza The formula of helmert for processing in Cartesian coordinates in X,Y,Z of the ellissoide by the coordinates φ, λ, h.

Longitudes on WGS84

WGS84 Use the zero meridian as defined by the Office de l' heure International as a result of the compilation of the comments of the planet in different countries.
The WGS84 Is a mathematical model of the earth by a point of view geometric, network and gravitational, built on the basis of the measures and of scientific and technological knowledge available to 1984.
The datum of geodesy classic, which can be defined local or regional, approximate well the geoid only around the point of the adoption, while the datum global wgs84 uses the standard egm96, that approximates the geoid as a whole and is valid throughout the world.

Cartesian geocentric fixed system (X, Y, Z)

As the basis of the earth system of coordinates is introduced a system Cartesian (X, Y, Z) With origin from the centre of mass.
S is the geocentro or center of mass atmosphere.
Axis Z coincides with axis of rotation of the earth.

The Guinea plan is perpendicular axis z and is defined by the plan (X-Y).
The plan (X-Z) is generated by the Greenwich meridian. The introduction of the rotation is necessary for the calculation of the time.

Primary parameters of the elissoide

System characteristics
Compass: accuracy 4 Th, after the calibration with resolution 0.1 °.
Rangefinder: determines distances and heights through the distanziometro to laser and an electronic Alpine integrated.
Measure distances horizontal and inclined by calculating instantly the height of the objects with extreme precision (30 cm). implements also different methods of measurement: Subject nearest,
subject more distant and measure continues (tracking). The instrument is equipped of serial port RS 232 for the transmission of data. Tripod socket photographic type.
GPS: Accuracy 9 mt on the position in the system operator georeferenziato wgs84..
Processor: system based on processors of the family arm for complex calculations in real time.
Trasmettitore: 1 Watt
All the system is protected by casings ponds of Type IP-66 resistant to bad weather and legislation mil for shock and vibration, all the components are of type RoHS complyant.

TECHNICAL CHARACTERISTICS OF Rangefinder

The Rangefinder emits laser pulses in the field of infrared light, invisible and harmless to the eyes.
For the calculation of the distances instant use sophisticated electronic circuits and a clock of high frequency, which is the time necessary to every impulse to reach the target and back. Robust and easy to use, particularly indicated for the hunting and all the situations in which to measure the distance of an object may seem difficult. The precision is typical of Metro ±1 + 1% of the distance measured, but in this version the precision was high in ±0, 3m. The maximum depends, as well as the precision, different variables, such as: the physical properties of the target (the color, the surface finish, the size and shape), Weather conditions (fog, rain, snow), and the light intensity environment. More the color is brilliant, more may extend the useful field of measurement. Red is highly reflective, for example, and allows greater distances than the color black, which is that less reflective. A surface glossy allows a higher capacity compared to an opaque surface. A target small is more difficult to align compared with a great target. Also the angle of the target affect.

Aiming a target to 90°, that is with the surface perpendicular to the direction of the laser beams, it has a scope optimal, which decreases as we departs from perpendicular. A poor brightness of the environment (for example sky covered) permits greater scope of the instrument. On the contrary, in very sunny days, the scope of Rangefinder decreases. The model used has a flow equal to 1000m on surface standard, 2000m on highly reflective surface. The Alpine integrated allows electronic measurements of slopes, distances straight and sloping, gradients and heights. Ideal to calculate the height from the ground also of electric cables, thanks to the function SCAN. magnification of the optical 7x. Discharge data on serial port RS232C (series). Complete the budget of this instrument the filters of correction against disturbances of measure and the threaded coupling ¼ for photographic tripod.

  • Distance precision: +- 0.3 m
  • Resolution: 0.1 m
  • Tipe of laser: class 1
  • Portata standard: 1000 m
  • Scope on reflective: 2000 m
  • Units of Measurement meters, yards
  • Enlargements: 7x
  • Inclination precision: +-0.25°
  • Reading corner: +-90°
  • Operating temperature: -20°/+60° C
  • Serial port RS 232
  • Battery: 2 x 1,5V AA
  • Dimension: 12 x 1 x 2 cm
  • Weight: 220 g
Technical characteristics of GPS receiver
  • A PORT RS-232 bi-directional
  • Strings out NMEA APB, BOD, BWC, GGA, GLC,GSA, GSV, LCD, HSC, MSS, RNN, RMC, RMA, RMB, VTG, WCV, XTE, ZDA, ZTG(Conforms to NMEA version 2.0 and more recently. It also supports 1.5GLL e BWC)
  • Strings entry NMEA WPL, TLL and more
  • recognises the data SC104 by most of the receivers
  • physical/environmental
  • water resistant
  • Flipped cartridge water tight
  • 0°C – 55°C max 95% of humidity , anti-condensation integrated
  • -25°C a +60°C Operating temperature
  • -55°C a +90°C Storage temperature
  • Receipt WAAS a 2 channels
  • Precision WAAS < 2 meters 2dRMS
Better precision of the distance of 8m or 0.9% better than the scale max
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