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 Wysłany: Pon 9:38, 10 Sty 2011 Temat postu: glätteisen ghd GPS navigator sailing in the narrow |
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GPS navigator sailing in the narrow channel in the positioning accuracy
Characteristics, and using km grid to the position, then the bound of error. 2.1 2 radar range error of a positioning accuracy of radar range accuracy boat 340 used for the range of 1% or 25m,[link widoczny dla zalogowanych], whichever is greater. Navigating in a narrow channel waters typically use the range of 1.5 and 3.0, 1.5 × 1% = 0.015 = 27.8m, 3.0 × 1% = 0.030 = 55.6m. The ship apparently used by the radar range accuracy according to the different range were 27.8m (1.5 scale) and 55.6m (3.0 scale). If the target is using only horizontal distance measured positioning error of the radar at this time is the 27.8m (1.5 scale) or 55.6m (3.0 scale). Proposed by radar ranging,[link widoczny dla zalogowanych], it is best to use 1.5 range, use the 3.0 range if Liao Wang, also should switch to 1.5 range, so after measuring the distance back to 3.0 range finish Liao expectations. 2.2 The position error of the radar in the course of work carried out before setting it to the place the radar base,[link widoczny dla zalogowanych], with the goal of the position accuracy of radar measurements will be the basis of the bit. The reference to the bit error include: scan lines and the orientation of the radar antenna synchronization error, the gyro compass error, sub-tracking error compass, radar heading setting human errors. Radar measurement of target azimuth accuracy but also by broadening the impact of echo. 340 radar a ship heading accuracy as the input source of ± 1.0. Or less. This indicates that the gyro compass error, sub-tracking error compass,[link widoczny dla zalogowanych], radar, human error when the course are set to zero in the case, scan line synchronization with the radar antenna azimuth accuracy of ± 1.0. Or less. If you take into account the gyro compass error, sub-tracking error compass, radar, human error of course settings and broadening the impact of echo, the radar target azimuth measurement accuracy will reach ± 2.0. (Gyro compass error is ± 0.25., Compass points tracking error ± 0.5., Human observation error ± 0.3., Echo caused by broadening the size of measurement error of the measured object orientation object distance,[link widoczny dla zalogowanych], the greater the distance, this error is larger.) Thus, if the objective measurement of the distance 0.5nmile, solely on the position accuracy, will be brought to the ship positioning △ D = 0.5 × 1852 × tan2.0. = 32.3m (see Table 2). From Table 2 we can conclude: the use of radar azimuth positioning accuracy than distance positioning accuracy, if taking into account the error of the radar distance 27.8m (1.5 scale), the use of the material from 0.4 marked the position from the position, the positioning accuracy is 38.0m. Usually the subject of the measured object distance is greater than 0.4. 3 Conclusion. In summary, the ship used in the narrow waters GPS positioning is possible, the positioning accuracy can be achieved 15.76m. Although the different coordinate systems to China's coastal waters can bring at least 60.68m positioning error, but the error is in Table 2 at different distances in a matter of marine radar azimuth positioning errors from the standard error of ZXD (m) 0.425.90.532. 30.638.80.745.30.851.70.958.21.064.71.171.11.277.61.384.11.4 '9 O. 51.597.0 could be amended. Gauss projection of a narrow channel navigation with map, GPS positioning to the inconvenience, as long as understand the projection principle, strictly in accordance with longitude and latitude positioning, the error can still be eliminated. Use of radar targets are horizontal positioning, the accuracy of 27.8m, but the target distance using radar azimuth positioning accuracy will be reduced to 38.0m below. The DGPS positioning accuracy of 15.76m, is superior to radar position. GPS positioning in order to avoid operating the inconvenience Gauss projection can be by means of electronic charts. Electronic charts on the ship position of the ship provided by the GPS, if the relevant wreck, shallow water location of the point identified on the electronic chart, and then just make sure I ship as shown in the fairway buoy sailing around the wreck and shallow water both point on it. Note that: ① the amount of take wreck, shallow water location of the point blueprint to be used when the amount of latitude and longitude line network access; ② the position taken on the measure of the coordinate system to carry out the conversion, which is converted to WGS 84 coordinate one.
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