San Jose Navigation GPS Mobile Locator GM-158-USB Specifikace stáhnout pdf (Strana 38)

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12 High Frequency antennas

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MALÅ High Frequency (HF) antennas are available with frequencies of 1.2,

1.6 and 2.3 GHz. The 1.2 and 1.6 GHz antennas also have an EM

(Electromagnetic) option, giving a GPR antenna with a 50/60 Hz EM-

locator.

The HF antennas are most suitable for investigations were high resolution

is important, as for construction/concrete investigation, asphalt mapping,

ice thickness etc. See also Table 12.1.

Table 12.1. Approximate depth ranges for different antenna frequencies.

Antenna

frequency (GHz)

Approximate Radial

Resolution

@,c=100

[m/μs] , λ

/4 [cm]

Approximate max

penetration depth (cm)

1.2

2.1

100

1.6

2.3

1.3

* In normal geological/construction environment absent of materials with low resistivity.

The HF antennas are one-piece radar antennas where the antenna

elements are contained in a small handheld, shielded box, which in turn

can be mounted on a wheel carriage, the HF cart. See Fig 12.1 to 12.3.

Figure 12.1 The HF antenna without the wheel carriage (1.6 GHz or 1.2

GHz with the EM option).

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San Jose Navigation GPS Mobile Locator GM-158-USB Specifikace Strana 38