C this function shall display upon request raim

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c. This function shall display, upon request, RAIM availability at the ETA and over an interval of at least + 15 minutes computed in intervals of 5 minutes or less about the ETA. 6. The GPS equipment shall detect a pseudorange step error greater than 1000 meters, including steps which cause loss of lock for less than 10 seconds. A pseudorange step is defined to be a sudden change in the measured distance to a satellite. If a pseudorange step is detected for a satellite, that satellite shall be excluded from use in the navigation algorithm until its integrity can be verified through fault detection (RAIM). The manufacturer is free to choose any method to calculate the predicted pseudorange or to detect a step. However, any method used should properly take into account satellite movement and aircraft dynamics up to a groundspeed of 750 knots and accelerations up to 14.7 meters/second/second. (viii) 2D Accuracy Requirements (95 percent probability) . In lieu of paragraph 2.2.2 of RTCA/DO-208, substitute the following requirement: The total of error contributions of the airborne equipment shall not exceed the error value listed in this paragraph. The reference spheroid shall use 1Page 37
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TSO-C129a latitude/longitude values corresponding to the WGS-84 ellipsoid (see Appendix B of RTCA/DO-208). Since FTE factors are beyond the control of the equipment manufacturer or installer, these error sources are not included in this paragraph. GPS RNAV 2D Accuracy Requirements (95% Confidence) Error Type Oceanic (nm) En Route (random or J/V routes) (nm) Terminal (nm) Non-Precision Approach (nm) Position fixing error* 0.124 0.124 0.124 0.056 * Equipment error assumes an average HDOP of 1.5, GPS equipment waypoint input and output resolution of 0.01 minute for approach/0.1 minute otherwise. Position fixing errors are static values. (ix) Sensitivity and Dynamic Range . Add the following requirements to paragraph 2.2.3.1 of RTCA/DO-208: Antenna elevation mask angles below 7.5 degrees may be utilized provided the applicant develops acceptable test conditions and supporting analysis to substantiate use of the desired mask angle. (x) Dynamic Tracking . Add the following requirement to paragraph 2.2.3.4 of RTCA/DO-208: The equipment shall meet the applicable GPS position integrity performance requirements of Table 2-1 within the specified times stated in paragraphs a. and b. (xi) Pressure Altitude Input Requirements . If the equipment incorporates altitude aiding, the following requirements apply: 1. Pressure altitude data shall not be utilized in GPS sensor certified to class C3 and C4 for RAIM or position determination functions. This requirement does not preclude the use of altitude data for smoothing. 2. Equipment certified to class C1 and C2 shall utilize pressure altitude data in the same manner as described in paragraphs (a)(3) (xx) and (xxi) of this TSO.
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