JMGAC-12M

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The JMGAC-12M belongs to the family of ground penetrating radar systems. It is a modified, purpose-built device intended for subsurface imaging applications. As the name implies, it operates on 12 MHz. The JMGAC-12M operates on the principle of radar emission by sending pulses of electromagnetic energy into the ground. After the energy penetrates the ground and encounters subsurface objects, such as boulders and interfaces between different geological materials, a portion of the energy is reflected back to the surface.

The JMGAC-12M antenna unit is composed of four separate units connected within a single frame -- an isokinetic transmitter, an isokinetic receiver, a fixed power source, and a high-power amplifier. The fixed power source provides both the isokinetic transmitter and the receiver with a continuous voltage power supply. The power source is also connected to the high-power amplifier, which increases the voltage and current of the transmitted waveform to the maximum allowable level.

The JMGAC-12M features a two-dimensional antenna array for signal reception and transmission. The array is composed of eight horizontally aligned antenna elements and eight vertically aligned elements. This arrangement allows the system to receive and transmit signals in all directions. The full array is said to scan up to 360 degrees in both the horizontal and vertical directions at the same time. In addition, the antenna unit includes a specific harmonic filter which filters away any out-of-band signals and undesired harmonic frequencies.

The system operates by transmitting a pulse into the ground, recording the reflected responses, and analyzing the returned signals. It is capable of reaching depths of up to 100 meters, with an accuracy of two meters being attainable. The processed signal from the JMGAC-12M produces an image showing the subsurface geological structure and placement of objects. Combined with advanced data interpretation algorithms, it is useful in a variety of underground imaging applications such as shallow groundwater exploration, underground utility mapping, soil stability studies, archeological surveys, and seismic refraction.

The operating characteristics of the JMGAC-12M make it particularly suitable for applications that require high resolution across a large area. It has been tested in various geological conditions including sand, clay, and alluvial bolides with satisfactory results. The system is also designed to be rugged for use in extreme conditions such as deserts and arctic regions, while remaining lightweight and easy to transport.

Overall, the JMGAC-12M is an excellent tool for subsurface imaging applications. It provides precise measurements with high accuracy and resolution, making it an invaluable device for a variety of geological surveys.

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