时间：2011-08-27 23:38来源：蓝天飞行翻译 作者：航空 点击：次
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The process of evaluating the products of a given system development activity to determine correctness and consistency with respect to the products and standards provided as input to that activity. Vertical Altitude Deviation Threshold A monitoring criteria parameter that determines whether a vertical altitude deviation non-conformancy exists. Vertical Conformance An aspect of flight conformance that expresses how well a flight is adhering to its system trajectory during the climb/descent phase. Quantified by calculating the climb/descent rate deviation and the climb/descent altitude deviation. Vertical Deviation The deviation of the aircraft above or below the vertical profile as displayed on an indicator such that deflection is up when the aircraft is below the vertical profile. Vertical Deviation Non-conformancy A flight related situation that exists for flights in the climb or descent phases, whenever a flight’s climb or descent rate differs by more than a vertical rate deviation threshold parameter from that expected, or he flight’s altitude differs by more than a vertical altitude deviation threshold parameter from that expected. Vertical Dilution of Precision See Geometric Dilution of Precision for a more detailed description. The ratio of user-referenced vertical position error to measurement error of a multilateration system. Vertical Intercept Point The point at which the current aircraft flight path angle intercepts the vertical profile. Vertical Navigation A function of RNAV equipment which calculates, displays and provides guidance to a vertical profile or path. Tip: to find a specific term, use the Acrobat search : click Vertical Profile A line or curve, or series of connected lines and/or curves in the vertical plane, defining an ascending or descending flight path either emanating from or terminating at a specified waypoint and altitude, or connecting two or more specified waypoints and altitudes. In this sense, a curve may be defined by performance of the aeroplane relative to the air mass. Vertical Profile Angle Error The difference in degrees that the current aircraft flight path angle makes with the vertical profile. Vertical Rate Deviation Threshold A monitoring criteria parameter that determines whether a vertical altitude deviation non-conformancy exists. Very High Frequencies The set of frequencies between 30 and 300 MHz. Very High Frequency Aeronautical Mobile Services VHF radio (voice) will remain in use in many continental and terminal areas. However, increasing use will be made of VHF Data links with data eventually being used more than voice. The present frequency band in which the aeronautical VHF communication system is operating is 118-137 MHz. Very High Frequency Data Link VDL provides packet data communications to aircraft and ground users provided by a VDL sub network that comprises airborne 'VHF data radios (VDRs), VHF ground stations and connectivity to routers on the aircraft and the ground. Very High Frequency Omni directional Range Test A ground facility which emits a test signal to check VOR receiver accuracy. Some VOT's are available to the user while airborne, and others are limited to ground use only. Very High Frequency Omni-directional (radio) Range 1- Sophisticated NDB which sends out a signal with a phase-shift dependent on the direction the signal is sent. This allows for more precise navigation and also corrects navigational problems due to wind. |
