The localization method of a magnetic dipole based on the gradient tensor invariants is Scalar Triangulation And Ranging (STAR), which used to solve multiple solutions problem for real-time by spatial geometric relationship rotation invariants. not involved in measurement field vector greatly affected geomagnetic field. Simultaneously, it very suitable underground and underwater exploration such as unexploded ordnance. But, has asphericity errors, can make azimuth errors up 5 <sup...

The magnetic tensor gradiometer, which is used for measuring the spatial derivatives of three orthogonal field components, an important characterization tool. Here, construction a full-tensor gradiometer described, utilizes four fluxgates arranged on planar cross structure, and single, triaxial, spherical feedback coil assembly. In this arrangement, one as reference, controlling currents through coils. Since are working in near-zero environment, stable improved accuracy. This design avoids...

Motion-induced noise (MIN) caused by the mechanical vibration of air-core coil sensor (ACS) in geomagnetic field is an important element detection method helicopter transient electromagnetic (TEM) systems. The MIN level heavily influences result when its frequency range covers TEM signal base (25 Hz). To reduce MIN, frequencies between and signals need to be separated. Accordingly, ACS must decreased a below 25 Hz. Hence, cable parallel (CPACS), consisting structure (CPS) ACS, designed for...

Emotion Support Conversation (ESC) is an emerging and challenging task with the goal of reducing emotional distress people. Previous attempts fail to maintain smooth transitions between utterances in ESC because they ignoring grasp fine-grained transition information at each dialogue turn. To solve this problem, we propose take into account turn-level state Transitions (TransESC) from three perspectives, including semantics transition, strategy emotion drive conversation a natural way....

Motion-induced noise (MIN) level is a crucial factor in rigid helicopter transient electromagnetic (TEM) system, which limited by two intrinsic constraints. First, the large transmitting current generates disordered field at sensing area that restricts configuration of coil sensor. Paradoxically, MIN's frequency range from 10 to 40 Hz, covers TEM signal's base (25 Hz) due mechanical character sensor on platform. Filtering MIN very difficult because and signals are cogenetic they have...

A distributed phase measurement method of frequency-domain electromagnetic detection is proposed. The theoretical analysis the previous literature shows that in applications, as an independent parameter can reduce diversity solution, and it also has advantage greater steepness than amplitude. Currently, there are few dealing with practical application audio detection, because difficult to obtain from separated devices. synchronization recording system designed based on most widely used GPS...

Cooperative work of multiple magnetic transmitting sources is a new trend in the development transient electromagnetic system. The key bipolar current waves shutdown, concurrently inductive load. In past, it was difficult to use constant clamping voltage technique realize synchronized shutdown currents with different peak values. Based on technique, we introduce controlling method time. We rising time control and low power source current. From viewpoint circuit energy loss, by taking...

The Cedaya-S340 Holgutu Highway Construction Project is located in the Mongolian Autonomous Prefecture of Bayingolin Xinjiang Uygur Region. It an important traffic channel that connects Luntai County and Hejing at southern foot Tianshan Mountains. As major component highway project, Huola Mountain Tunnel has a sharp topographic relief, and, therefore, commonly used land geophysical detection instruments cannot work on it. Therefore, we conducted qualitative survey ground-to-air airborne...

This letter presents a low-cost wind-insensitive ultrawideband conformal balloon antenna for wireless seismic telemetry applications. The proposed design consists of conductive strips attached on two surfaces, lightweight three-dimensional printed bi-conical feeding structure, and third large shielding protection buoyancy enhancement. Experimental characterization fabricated prototype has demonstrated the exhibiting low reflection coefficients, stable quasi-omnidirectional patterns, flat...

In a helicopter transient electromagnetic system, the quality of transmitting-current waveform will affect geological exploration effect. this paper, TEM inverter, based on single-clamp source and pulse width modulation technology, is designed analyzed. Besides, it finds that there be current oscillation in early measuring stage. For problem, first, factors cause are Then, proposed to apply RC snubber eliminate oscillation. Since imaginary part pole essence oscillation, configuring can By...

The magnetic gradient tensor exploration system (MGTES) has many advantages which can not be found in the total field and vector measurement system. So MGTES become one of main development directions surveys. made by multi-fluxgate is born with low-cost, low motion noise, portability so on. But constituted multiple sensors. consistency sensors a great influence on or even results failure. A prominent problem that fluxgate sensor produces random zero drift when powered. We analyzed proposed...

The bird's movement causes a variable primary response in the helicopter transient electromagnetic (HTEM) system called multiplicative noise (PMN). PMN dominates measured data on time and early off will significantly impede interpretation of shallow earth. Measuring estimating is difficult due to complexity kinematic state high testing cost. We propose use elastic-net regularized linear regression (ENLR) framework suppress adaptive momentum estimation (Adam) speed up process. First, we...

In the semi-aviation frequency-domain electromagnetic measurement, induction air-core coil and differential pre-amplifier circuit introduce noise, which affects sensor results in receiving weak signals improving signal-to-noise ratio of system. response to this problem, by analyzing physical structure mechanism amplification circuit, combined with simulation experimental tests voltage current resistance noise other components, analyzed that thermal is main component system frequency band,...

Air-core coil sensors are widely used in geophysical electromagnetic exploration because of their ease production, high sensitivity, and broadband. In order to increase the bandwidth air-core without reducing number turns, a new type dual-air-core sensor was proposed for shallow method. The design principle introduced, consisting low-bandwidth high-bandwidth coil. output voltage high-frequency is as linear reference obtain amplitude-frequency response data low-frequency coil, fitting model...

An m-sequence is applied to the helicopter-borne electromagnetic method system for first time, and there are many problems be solved, one of which detection quality transmitting current waveform, directly affects resource survey results. In this research, we found that triple-correlation function (TCF) can reveal bit integrity characteristics encoded current. On basis, paper proposes extract three-dimensional information normalized TCF plot by using a peak and, then, use dual-threshold...

Summary According to the law of conservation energy, this paper deduces relationship with time current rising, expected peak current, clamping voltage instrumentation and inductance obstruction characteristic loading coil. It can help finish setting an instrument's initial parameters. Existing papers only represent working process digital control which is precise way makes parameters unknown. And need be adjusted step by step, system less effective secure. This clearly demonstrates...

The transfer characteristic of the receiver sensor (TCRS) in a helicopter transient electromagnetic (HTEM) system can severely distort measured data, especially early off-time. Removing TCRS is essential for an accurate and quantitative description HTEM data. Precise Measurement suppression are challenging due to measurement errors noise system. We propose use calibration device train Wiener filter then construct deconvolution function remove enhance system’s shallow detection capabilities....