Design scheme of a high dynamic semi-airborne transient electromagnetic receiving system based on a voltage-controlled amplifier

The semi-airborne transient electromagnetic (SATEM) technique is established to examine subsurface targets. SATEM approach widely used in urban underground space exploration, hydrogeological search, and deep mineral exploration. However, the strength of signals declines exponentially with depth detection, system frequently operates high noise environments, directly affecting precision information interpretation. This research presents a dynamic (HDSATEM) receiving increase late signal intensity. mainly comprises voltage-controlled amplifier (VCA) function generator. In addition, VCA modulated using gain voltage produced by Consequently, simulation model has been employed analyze various functions compare ranges. actual amplification performance restoration capacity are confirmed laboratory test. A field experiment also carried out evaluate detection proposed compared standard controlled source audio-frequency magneto-telluric systems. findings indicate that improvement HDSATEM more than 50% terms