| CPC G01S 19/35 (2013.01) [G01S 19/37 (2013.01); H01Q 1/285 (2013.01)] | 8 Claims |
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1. A low-altitude frequency domain electromagnetic detection device, comprising a supporting rod I (1), a supporting rod II (2), a transmitting wireframe (3), a receiving wireframe I (4), a transmitting and receiving system (5), a receiving wireframe II (6), wherein the supporting rods I (1) and II (2) are non-magnetic rigid rods, the transmitting wireframe (3), the receiving wireframe I (4) and the receiving wireframe II (6) are rectangular frames and wound with a plurality of turns of enameled wires, the number of turns and diameters of the enameled wires of the receiving wireframe I (4) and the receiving wireframe II (6) are the same, the transmitting wireframe (3), the receiving wireframe I (4), the transmitting and receiving system (5) and the receiving wireframe II (6) are respectively fixedly connected with the supporting rod I (1) and the supporting rod II (2) at intervals in sequence along the extending direction of the supporting rod I (1), and two sides of a frame composed of the supporting rod I (1) and the supporting rod II (2) are respectively connected with an unmanned aerial vehicle (8) through non-magnetic anti-torsion ropes (7);
the transmitting and receiving system (5) comprises a main control module, a storage module, a sine wave generation module, an altimeter module, a GNSS module, a dual-channel synchronous data acquisition module (51), the transmitting wireframe (3) is in signal connection with the sine wave generation module, the receiving wireframe I (4) and the receiving wireframe II (6) are in signal connection with the dual-channel synchronous data acquisition module (51), respectively, the sine wave generation module, the altimeter module, the GNSS module and the dual-channel synchronous data acquisition module (51) are in signal connection with the main control module, respectively, and the main control module controls the sine wave generation module and receives data of the altimeter module, the GNSS module and the dual-channel synchronous data acquisition module (51) and records the data in the storage module;
the transmitting and receiving system (5) is further provided with an adjustable analog signal amplification module, the receiving wireframe II (6) is in signal connection with an input terminal of the adjustable analog signal amplification module, an output terminal of the adjustable analog signal amplification module is in signal connection with the dual-channel synchronous data acquisition module (51);
the dual-channel synchronous data acquisition module (51) comprises an A/D analog-to-digital conversion module and an MCU digital acquisition controller, and an input terminal of the A/D analog-to-digital conversion module is in signal connection with the receiving wireframe I (4) and the receiving wireframe II (6) respectively for converting an analog signal of induced electromotive force of the receiving wireframe into a digital signal; an input terminal and an output terminal of the MCU digital acquisition controller are in signal connection with the A/D analog-to-digital conversion module and the main control module respectively for controlling the A/D analog-to-digital conversion module and transmitting digital signal data to the main control module;
the center-to-center distance from the transmitting wireframe (3) to the receiving wireframe II (6) is at least 4 times the center-to-center distance from the transmitting wireframe (3) to the receiving wireframe I (4); and
the unmanned aerial vehicle (8) is controlled to take off to a height above the effective depth detection capability of the receiving wireframe I (4), the sine wave generation module is then controlled to generate signals and electromagnetic waves are transmitted through the transmitting wireframe (3), the main control module reads induced electromotive forces V1, V2 of the receiving wireframe I (4) and the receiving wireframe II (6).
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