Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 4447

f) The decoded position longitude, Rloni, is then computed from the values of m, XZi, and ∆loni using the equation: Rloni = ∆loni ⋅ 2.6.7 GLOBALLY UNAMBIGUOUS AIRBORNE POSITION DECODING The CPR algorithm shall utilize one airborne-encoded “even” format reception (denoted XZ0, YZ0), together with one airborneencoded “odd” format reception (denoted XZ1, YZ1), to regenerate the global geographic position latitude, Rlat, and longitude, Rlon. The time between the “even” and “odd” format encoded position reports shall be no longer than 10 seconds. Note 1.— This algorithm might be used to obtain globally unambiguous position reports for aircraft out of the range of ground sensors, whose position reports are coming via satellite data links. It might also be applied to ensure that local positions are being correctly decoded over long ranges from the receiving sensor. Note 2.— The time difference limit of 10 seconds between the even- and odd-format position reports is determined by the maximum permitted separation of 3 NM. Positions greater than 3 NM apart cannot be used to solve a unique global position. An aircraft capable of a speed of 1 850 km/h (1 000 kt) will fly about 5.1 km (2.8 NM) in 10 seconds. Therefore, the CPR algorithm will be able to unambiguously decode its position over a 10-second delay between position reports. Given a 17-bit airborne position encoded in the “even” format (XZ0, YZ0) and another encoded in the “odd” format (XZ1, YZ1), separated by no more than 10 seconds (= 3 NM), the CPR algorithm shall regenerate the geographic position from the encoded position reports by performing the following sequence of steps:

Source: https://magyarkozlony.hu/hivatalos-lapok/7e70cec03f34e3c2efd8610b865b65591eafd701/dokumentumok/a55dc160549d57fa4db0035e37c6a6a98dd1a0b9/letoltes