Chapter 3: Vehicle-Mounted GPR System for Landmine Detection

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30 3. Vehicle-Mounted GPR System for Landmine Detection Fig. 3.2: Case and VNAs of SAR-GPR. Three VNAs shown in the right-hand side are installed in upper white part, and six antennas are in lower blue part of the case. Fig. 3.3: SAR-GPR mounted on Mine Hunter Vehicle (MHV) developed by Fuji Heavy Industries Ltd., Japan and by the Department of Electronics and Mechanical Engineering Chiba University, Japan.
3.2 Development of the System 31 3.2.2 Use of three VNAs In this system, three pairs of antennas are used to acquire multi-offset data. In general GPR measurements of geological surveys, the data acquisition is done over and over again with changing the separation of antennas or with switching the signal using array antennas. However, the acquisition must be done three times for one position and the goal cannot be accomplished by using these methods. Our solution is simultaneous usage of three vector network analyzers. This manner can ideally reduce the acquisition time by 1/3 compared to the case of using only one VNA. There are two problems in the use of three VNAs simultaneously. One is the size and weight. In general, a VNA is a huge and heavy instrument, e.g. 35×22×46 cm and 25 kg (Anritsu MS4622). It is too large and heavy to carry three of them on a robot arm or even on a vehicle. Thus, the team of Tohoku University developed a new VNA shown in Fig. 3.4 together with Anritsu, Japan and USA under support of JST. It is very small, 20×30×5 cm, and very light weight, less than 1 kg without case, but it has almost the same performance as the general one, especially for the sweep speed and accuracy. The specifications are listed in Table 3.1. Fig. 3.4: Vector network analyzer employed in SAR-GPR.
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Chapter 3: Vehicle-Mounted GPR System for Landmine Detection

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