Publication: Magyar Közlöny
Issue: MK-2007-70 (Year: 2007, Number: 70)
Era: 2004-2010
Section: Melléklet a 2007. évi XLVI. törvényhez
Paragraph Index: 3785

c) istortions If the correlation peak is misshapen, an aircraft that uses a correlator spacing other than the one used by the reference receivers may experience MI. 8.3 The threat model proposed for use in assessment of SQM has three parts that can create the three correlation peak pathologies listed above. 8.4 Threat Model A consists of the normal C/A code signal except that all the positive chips have a falling edge that leads or lags relative to the correct end-time for that chip. This threat model is associated with a failure in the navigation data unit (NDU), the digital partition of a GPS or GLONASS satellite. 8.4.1 Threat Model A for GPS has a single parameter ǻ, which is the lead (ǻ < 0) or lag (ǻ > 0) expressed in fractions of a chip. The range for this parameter is –0.12  ǻ  0.12. Threat Model A for GLONASS has a single parameter ǻ, which is the lead (ǻ < 0) or lag (ǻ > 0) expressed in fractions of a chip. The range for this parameter is –0.11  ǻ 0.11. 8.4.2 Within this range, threat Model A generates the dead zones described above. (Waveforms with lead need not be tested, because their correlation functions are simply advances of the correlation functions for lag; hence, the MI threat is identical.) 8.5 Threat Model B introduces amplitude modulation and models degradations in the analog section of the GPS or GLONASS satellite. More specifically, it consists of the output from a second order system when the nominal C/A code baseband signal is the input. Threat Model B assumes that the degraded satellite subsystem can be described as a linear system dominated by a pair of complex conjugate poles. These poles are located at ı ± j2ʌfd, where ı is the damping factor in nepers/second and fd is the resonant frequency with units of cycles/second. ATT D-43 23/11/06 2007/70/II. szám Annex 10 — Aeronautical Communications Volume I 8.5.1 The unit step response of a second order system is given by: t e(t) exp(

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