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    • 7. 发明授权
    • Radio location with enhanced Z-axis determination
    • 无线电位置具有增强的Z轴确定
    • US5652592A
    • 1997-07-29
    • US470739
    • 1995-06-06
    • H. Britton SanderfordRobert E. Rouquette
    • H. Britton SanderfordRobert E. Rouquette
    • G01S5/00G01S5/06G01S1/00
    • G01C5/06G01S5/0036G01S5/06
    • An enhanced system for calculating the Z-Axis, or relative height or altitude, of a radio beacon. The present invention uses a barometric pressure sensing device co-located with the radio emitter to transmit data representing relative altitude. To further enhance the Z-Axis determination, one or several barometric sensors, located at known heights, are positioned around the city to provide real time barometric data. This real time data is used to form a differential correction factor which is compared to the to the time varying barometric sensor co-located with the radio emitter, thereby yielding Z-Axis accuracies of up to one (1) foot. Since the altitude essentially becomes a "known", this information can also be used in the least squares fit algorithm to enhance the X and Y determination as well. As an alternative to differential readings from "known" altitude barometric sensors, the X,Y position of the radio emitter itself, or a check-in by a user, can be used to determine times when the radio emitter is at a known altitude thus providing occasional positions for "self" correction. Further, a mobile barometric reference, with a known Z-axis, can be purposely brought in proximity of the unknown altitude transmitter by, for example, a search team to provide differential information. Lastly, additional radio techniques are taught to assist a mobile search team.
    • 用于计算无线电信标的Z轴或相对高度或高度的增强系统。 本发明使用与无线电发射器共同位置的气压感测装置来发送表示相对高度的数据。 为了进一步增强Z轴测定,位于已知高度的一个或几个气压传感器位于城市周围,以提供实时气压数据。 该实时数据用于形成与与无线电发射器共位的时变气压传感器进行比较的差分校正因子,从而产生高达一(1)英尺的Z轴精度。 由于高度基本上变成“已知”,所以该信息也可以用于最小二乘拟合算法中以增强X和Y的确定。 作为来自“已知”高度气压传感器的差分读数的替代方案,无线电发射器本身的X,Y位置或用户登记可以用于确定无线电发射器处于已知高度的时间 为“自我”纠正提供偶尔的职位。 此外,具有已知Z轴的移动气压参考可以被例如由搜索团队有目的地带到未知高度传感器附近以提供差分信息。 最后,教授额外的无线电技术来协助移动搜索团队。