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    • 28. 发明申请
    • Position finding system and method used with an emergency beacon
    • 定位系统和方法用于紧急信标
    • US20080024365A1
    • 2008-01-31
    • US11882172
    • 2007-07-31
    • Kevin HolmesWilliam Street
    • Kevin HolmesWilliam Street
    • G01S5/00G01S1/00G01S3/00
    • G01S5/04G01S5/10G01S19/51
    • Disclosed is an apparatus and method for locating a transmitter. The apparatus comprises an antenna, a receiver and a memory adapted to store the plurality signals received by the receiver and antenna. The plurality of signals represents a plurality of data points relating to the position of the transmitter as measured at a plurality of unique locations. The location of the transmitter is calculated using the plurality data points. The plurality of data points may represent a measured frequency of a signal transmitted by the transmitter a direction of the transmitter or any other type of data. The method may comprise utilizing the Doppler shift rate of change of an assumed transmitted frequency to calculate a conical surface. The calculated intersection of a plurality of conical surfaces to defines the location of the transmitter.
    • 公开了一种用于定位发射机的装置和方法。 该装置包括天线,接收机和适于存储由接收机和天线接收的多个信号的存储器。 多个信号表示在多个唯一位置处测量的与发射机的位置有关的多个数据点。 使用多个数据点计算发射机的位置。 多个数据点可以表示由发射机发送的发射机的方向或任何其他类型的数据的信号的测量频率。 该方法可以包括利用假定的发射频率的多普勒频移变化率来计算锥形表面。 所计算出的多个锥形表面的交点以限定发射器的位置。
    • 29. 发明申请
    • 406 MHz emergency beacon with in-band homing transmitter
    • 406 MHz紧急信标带带内归位发射机
    • US20050073458A1
    • 2005-04-07
    • US10996391
    • 2004-11-26
    • William Street
    • William Street
    • G01S19/48G01S1/68G01S5/02G01S1/00
    • G01S5/0226G01S1/68
    • A search and rescue beacon includes a main transmitter transmitting a Cospas-Sarsat signal at a main frequency and an auxiliary homing transmitter transmitting a homing signal at a homing frequency close to the main frequency. Advantageously both the Cospas-Sarsat signal and the homing signal are generated by a single synthesizer switching between a main Cospas-Sarsat burst transmission and a continuous homing frequency transmission of the homing signal. The Cospas-Sarsat signal is advantageously transmitted at a higher power than the homing signal. The single synthesizer may use a single amplifier chain. The single synthesizer and amplifier chain may use a single antenna.
    • 搜索和救援信标包括以主频率发送Cospas-Sarsat信号的主发射机和以接近主频率的归属频率发送归属信号的辅助归属发射机。 有利的是,Cospas-Sarsat信号和归巢信号由单个合成器在主要Cospas-Sarsat突发传输和归属信号的连续归巢频率传输之间切换产生。 Cospas-Sarsat信号有利地以比归巢信号更高的功率传输。 单个合成器可以使用单个放大器链。 单个合成器和放大器链可以使用单个天线。