To solve the issues of unidirectional transmission,poor reliability,and low transmission rate in domestic drill-ing systems,a relay-based bidirectional electromagnetic transmission solution while drilling was proposed.Through field measurements of drilling transmission signals,the channel characteristics of wireless transmission through drill rods were depicted.A relay-based bidirectional communication protocol was designed,effectively enhancing the transmission distance and stability of drilling signals.A drilling prototype,composed of field programmable gate array(FPGA),ampli-fication circuit,analog-to-digital converter(ADC),digital-to-analog converter(DAC),and antenna,was constructed and tested.Field test results demonstrate that the proposed scheme achieves reliable relay-assisted bidirectional transmission of electromagnetic signals,with a single-hop transmission distance of 30 m and relay transmission distance exceeding 100 m.Concurrently,the transmission rate of this scheme is at the kbit/s level,an order of magnitude improvement over traditional unidirectional drilling systems.
关键词
随钻电磁测量/中继转发/双向传输/随钻样机
Key words
electromagnetic measurement while drilling/relay forwarding/bidirectional transmission/drilling prototype
维普
万方数据