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1. 发明授权

US4236234A Radio frequency seismic gathering system employing an airborne blimp 失效
标题翻译：使用空中飞行的射频地震采集系统
公开(公告)号：US4236234A
公开(公告)日：1980-11-25
申请号：US60625
申请日：1979-07-25
申请人： William T. McDavid , James M. McKeever , Roger A. Imm
发明人： William T. McDavid , James M. McKeever , Roger A. Imm
IPC分类号： G01V1/22
CPC分类号： G01V1/223
摘要： The central station of a radio-connected seismic surveying system uses a tethered blimp carrying an antenna and an electronics package including a dc voltage/rf decoupler, a variable dc controlled preamplifier, a P-I-N diode switch for changing the antenna from receive to transmit operation, a transmitter and modulator and a battery. An rf coaxial cable to ground provides means for controlling the preamplifier gain and for switching the central station to the transmit mode by using appropriate dc signals. In the receive mode, the cable carries detected field unit seismic signals, which are detected by the blimp-carried antenna and preamplified by the blimp preamplifier, to the ground for suitable recording and further processing in the ground portion of the central station. An audio channel can also be modulated onto the transmit carrier of approximately 70 MHz to provide voice communications via the blimp electronics, if desired. Both the ground portion and the blimp portion of the central station are packaged for helicopter transporting.
摘要翻译：无线电连接的地震测量系统的中心站使用带有天线的束缚式飞艇和包括直流电压/射频去耦器，可变直流控制前置放大器，PIN二极管开关的电子封装，用于将天线从接收改变为发射操作，发射机和调制器以及电池。同轴电缆到地面提供了控制前置放大器增益的手段，并通过使用适当的直流信号将中心站切换到发射模式。在接收模式下，电缆将检测到的天线单元地震信号传送到地面，以便在中心站的地面部分进行适当的记录和进一步处理，这些地震信号由飞轮携带的天线检测并由前置放大器进行前置放大。如果需要，也可以将音频信道调制到大约70MHz的发射载波上，以经由飞轮电子设备提供语音通信。中央车站的地面部分和飞艇部分均包装在直升机运输中。

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