Beyond 15 degrees, the low observable qualities are compromised as a 90 degree surface is exposed to enemy radars (Trimble, 2012, Source 51). Radar beam 510 includes RF characteristics which reduce its probability of detection by opposing forces. © 2004-2021 FreePatentsOnline.com. Hence, in the same manner that the information from the attitude sensor 201 can be used to direct radar beam 510 to a substantially vertical attitude, system 200 can solve for the AGL altitude of aircraft 450. The Vertical Profile of Radar Reflectivity of Convective Cells: A Strong Indicator of Storm Intensity And Lightning Probability? In step 705, the altitude computer of radar altimeter 203 determines an attitude correction required to point the radar altimeter in a substantially vertical direction. Referring now to FIG. Assignors: PARAMORE, STEVE, ROBERTSON, ROY E., WOODELL, DANIEL L. RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES, Systems using the reflection or reradiation of radio waves, e.g. INS 205 provides redundancy for the GPS position of SPS 202. U.S. Appl. (left) Spatial distributions of the number of observable radar nodes at altitudes of (a.1) 500, (a.2) 2000, (a.3) 5000, and (a.4) 10 000 m are shown. ALCOR ARPA Lincoln C-Band Observable Radar ALCS Airborne Launch Control System ALD Airlift Division ALE (1) AIRES Lifecycle Extension; (2) Automated Link Establishment ALERT Attack and Launch Early Report to Theater (AF) ALES AIRES Life Extension System ALF Auxiliary Landing Field ALFA Advanced Liaison Forward Area ALL Airborne Laser Laboratory The apparatus includes means for determining the presence of weather from weather radar returns, means for determining an uncertainty factor for the weather in response to the weather radar returns and a range, and means for displaying the weather and an indication of the uncertainty factor. As described above, system 200 allows operations into and out of airstrip 600 without external ground-based transmitters. FIG. Comparing the GPS position to the GPS coordinates of the terrain directly beneath aircraft 450 yields the predicted AGL altitude. The present invention provides a novel solution to the above requirements. The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. This allows the autopilot to fly the approach, adjusting the flight path of aircraft 450 in response to the augmented GPS position information provided by system 200. Again for each quantized altitude with known antenna pointing angles, a non-real-time calculation can integrate radar reflectivities over each of the overlapping beams and the differences in return power between beams computed. The uncertainty of those assessments is driven by the variableness of weather, the extreme low level radar returns in environments such as the tops or sides of conductive weather, and the vertical beam width inherent in weather radar systems. In addition, the system of the present invention provides an added degree of redundancy, providing an additional source of navigation information for use in conjunction with other pre-existing aircraft navigation instruments (e.g., INS, ILS, TACAN, etc.). Such methods include for example, direct replacement, Kalman filtering, minimum least square techniques, and the like.
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