System of measurement of field AGRISTAR, Zaporizhia region.

Main features of the AGRISTAR program: — measurement of area of any shape, size and locations; — view measurement files on the monitor; — field names; entered notes about the culture, variety, dates; — There is a function of a car navigator with license maps of Navitel, IGo. You just need to take "AGRISTAR" with you. Go around or go around a plot of land (field), and the program will automatically make all the necessary measurements. When making measurements, the system constantly calculates the coefficient of error, and when it increases, it will signal you about it. And most importantly, the system will not record data with a high error rate. If, during the measurement, you come across an obstacle, you can put a "pause" in the measurements, overcome the obstacle and continue the measurement. On the screen of the device you will see the configuration (figure) of the measured area. You can give a name to the measured area and save it in the device's memory. The device is equipped with a licensed program with the IGo navigation system, with which you can easily get to any settlement, city, district center. Measurement accuracy Measurement accuracy is the most frequently asked question. First of all, it is necessary to distinguish the concepts of "accuracy of the device" and "accuracy of the program". The fact is that the accuracy of GPS devices (car navigators) mainly depends not on the size and quality of the antenna, but on the coordinate calculation algorithm. The "Agrozamer" program has its own forgiveness algorithm, which determines the accuracy and cost of the device as a whole. For example, let's calculate the error for a field of 200 hectares. The perimeter of the field (200 hectares) is 8 km. The maximum deviation is 1 m. 8000 m * 1 m = 8000 square meters. m = 80 acres (0.8 hectares). That is, with the maximum deviation (to one side), the error is 0.8%. This is ideal. And in practice, the error is much smaller, because if there is a shift of the coordinates in some direction (by 0.5 m), the device will cut one side of the field by 0.5 m, and add the same amount to the opposite side. The practical error does not exceed 0.4 — 0.6%
Technical characteristics: • Operating temperature: -10 C to +60 C • Storage temperature: -20 C to +70 C • Operating humidity: 45% - 80% • Storage humidity: 30% - 90% • Operating frequency: 372 MHz • Microprocessor control device: ATLAS 372 MHz • SD RAM: 64 MB – 256 MB • Flash: 128 MB • Navigation software: SD card • Operating system: Windows CE Core 5.0 • Compiler type: ARMV4I • Display size: 3.5 inches • Audio output: 2-track timbre CD • Audio power: two-way headphone channel 0.25W/8/2W single-way channel • Average power: 1.5W • Idle power: < 20 mW • Battery type: rechargeable built-in lithium battery • Duration of battery charge: up to 3 hours of continuous work; 200 hours in standby mode • Chipset: Si-RF Start III • S/A code (GPS accuracy level indicator): 1.023 MHz (signal transmission rate) • Channels: 20 • Tracking sensitivity: -159 dBm • Accuracy: 2D RMS application of wide-band amplifying system (WAAS) • Speed: 0.1 m/s • Request processing: 0.1 sec on average. • Starting from a hot state: < 3 sec. • Starting from a warm state: an average of 38 seconds. • Starting from a cold state: < 100 sec. • Maximum speed: 515 m/s • Acceleration: 4 g • Internal antenna: built-in active ceramic antenna • Internal antenna gain: 27 dB • Internal antenna voltage: 3.3 V 5%