CN203164435U - Four rod type length adjustable submarine cable detection antenna array - Google Patents

Abstract

The four-rod submarine cable detector with adjustable side length includes an antenna array and a data transmission module. The data of the antenna array is transmitted to the host computer by wire through the data transmission module. The antenna array with this structure can adjust the side length of the array to optimize the measurement results according to different on-site actual measurement situations. The accuracy of the submarine cable burial depth and routing information measured by the antenna array of the utility model will be greatly improved and convenient; the operator sends an instruction through the host computer software to control the data transmission module to collect and transmit data, which is more accurate than the traditional method. Raises a lot and is easy to install.

Description

Four-rod submarine cable detection antenna array with adjustable side length

technical field

The utility model relates to a submarine cable detection antenna array with a new structure, which can conveniently measure the route and buried depth of the submarine cable in real time according to different on-site actual measurement conditions, and is a four-rod type submarine cable detection with adjustable side length antenna array.

Background technique

With the continuous development of communication technology, submarine cables, including submarine cables and submarine optical cables, have become the main means of cross-sea communication and are widely used around the world. At present, there are hundreds of thousands of kilometers of submarine cables in the world. Since the extensive use of submarine cables, due to various reasons, including human and natural factors, there have been many safety problems in submarine cable communication lines. On the one hand, the damage caused by natural disasters, on the other hand, various offshore engineering projects are constructed near the submarine optical cable route, which directly endangers the safety of the submarine optical cable. In order to prevent and avoid damage to the optical cable and affect the communication of the optical cable, it is necessary to accurately detect the routing and burial depth of the submarine cable. At the same time, it also brings convenience for future maintenance and repair work. Therefore, the research on submarine cable routing and depth detection has important theoretical and practical significance.

As a detection technology, the AC magnetic field detection method is widely used in submarine cable routing and buried depth detection. The dummy point method and the peak method are both based on the AC magnetic field detection method to measure the routing and buried depth of the submarine cable. However, due to the single sensor of these traditional methods, the probe coil needs to move back and forth on the submarine cable to find the peak point or the dumb point to determine the position and direction of the submarine cable, which is easy to cause misjudgment, and requires many parameters, including the buried cable. Depth, offset distance and deflection angle, but there are few applicable calculation equations, and multiple measurements at different points are required, resulting in insufficient measurement accuracy.

Contents of the invention

The technical problem to be solved by the utility model is: to improve the accuracy of submarine cable routing and buried depth measurement, and to achieve the best measurement effect according to the actual conditions of different measurement sites, which is more flexible and convenient.

The technical scheme of the utility model is: a four-rod type submarine cable detection antenna array with adjustable side length, including an antenna array and a data transmission module, and the data of the antenna array is transmitted to the upper computer in a wired manner through the data transmission module;

The antenna array includes four probe rods and a rhombic frame, each probe rod is wound with a coil, and the probe rods are made of magnetic materials to form an inductive probe rod, and the four probe rods are respectively fixed at four vertices of the rhombus frame, The probes are independent of each other and have no data connection. Each probe is connected to the data transmission module through a cable. The four probes are all located on the same plane of the rhombus. Each probe takes the diagonal line of the rhombus where it is located as the axis. The length of the side of the rhombus can be adjusted to realize the adjustment of the distance from the center of the rhombus frame to the four vertices.

The antenna array of the utility model is composed of four probe rods, and coils are wound on the probe rods. The four probes are respectively fixed at the four vertices of the rhombus frame, and the direction of the probes on the two opposite corners is parallel to the line connecting the two corners, that is, the diagonal, forming a rhombus array with adjustable side lengths. During the measurement, the relative position of the probe array and the submarine cable is fixed, and one set of two opposite probes of the antenna array is perpendicular to the sea level, and the other set is parallel to the sea level. At this time, the alternating current passing through the submarine cable will spread electromagnetic waves to the surroundings, the probes in the array will feel the changes of electromagnetic waves, and an induced electromotive force will be generated in the coil. The magnitude of the induced electromotive force generated by the probe perpendicular to the sea level is only related to the buried depth of the submarine cable and the horizontal distance between the projection of the probe and the submarine cable. The magnitude of the induced electromotive force generated by the probe parallel to the sea level is related to the buried depth of the submarine cable. The projection of the probe is related to the horizontal distance of the cable and the angle between the probe itself and the cable. The four probes form a diamond-shaped array. Finally, the absolute value of the induced electromotive force of these four probes is substituted into the calculation formula, and the specific data of the route and buried depth of the submarine cable can be obtained. The data transmission module is composed of RS-232 bus, current loop serial interface and data acquisition box. The data acquisition box transmits the collected data to the host computer through USB. Finally, the interface software of the host computer displays the waveform diagram of the data measured by each probe in real time, and analyzes and processes the measured data to obtain the routing and buried depth information of the submarine cable.

The utility model comprises two parts, one part is an antenna array with an optimized structure, including four probe rods located at four corners of a rhombus. The antenna array of the utility model is a diamond-shaped array composed of four probes. Since there are three unknown quantities of deflection angle, deflection distance and buried depth in the route of the submarine cable and the buried depth detection, each probe can be obtained during the measurement. One equation, in this way, four equations can be obtained in one measurement, and a set of parameters of the routing and buried depth of the submarine cable can be obtained for each point measured. The traditional dumb point method, peak method, etc. have a single antenna and need to measure at multiple points to obtain the parameters of the submarine cable and are likely to cause misjudgment. The antenna array of the utility model optimizes the number of antennas. It is impossible to get a set of parameters every time, and if there are too many parameters, the cost of the instrument will be increased. The induced electromotive force obtained by the probe perpendicular to the sea level in the antenna array is only related to the offset distance and buried depth, and has nothing to do with the included angle, and the projections of the two coincide. This design is conducive to simplifying the equation and calculation; the two probes parallel to the sea level The rods are at the same height and the deflection angle is the same, so the magnitude of the induced electromotive force is only related to the deflection distance. In this design, the magnitude of the induced electromotive force of the two probe rods can be compared to determine which probe is closer to the submarine cable. Therefore, the accuracy of the buried depth of the submarine cable and the routing information measured by the antenna array of the utility model will be improved a lot and it is convenient; collection and transmission.

Description of drawings

Fig. 1 is a structural diagram of the antenna array of the present invention.

Fig. 2 is the system diagram of the utility model.

Fig. 3 is a schematic diagram of a measurement example 1 of the present invention.

Fig. 4 is a schematic diagram of measurement example 2 of the present invention.

Detailed ways

The utility model proposes a four-rod type submarine cable detection antenna array with adjustable side lengths. By rationally selecting the number of probe rods and optimizing its structure, a diamond-shaped array is formed, and the side length of the rhombus is adjustable, which can be adjusted according to the actual measurement site conditions. Adjust the side length of the array to achieve the best measurement effect. Each point can get a set of parameters of the submarine cable, so it can efficiently and accurately measure the route and buried depth of the submarine cable, which has high practical value.

As shown in Figure 1, the antenna array consists of four probes with coils wound on them. The material for making the probe requires high magnetic properties, and a rod-shaped iron core is generally used. Copper wire coils are wound on the probe, because the antenna array measures the magnitude of the induced electromotive force, and the magnitude of the induced electromotive force is proportional to the number of turns of the coil. In order to reduce the impact of environmental noise, the number of turns of the coil should be increased as much as possible to ensure that the measured value is large enough. The four probes are respectively fixed at the four vertices of the rhombus frame, all of which are located on the same plane of the rhombus, and the two probes on the opposite corners of the rhombus are oriented to the line connecting the two corners, that is, the diagonals are parallel, and the rhombus Adjustable side length. As shown in Figure 2, during the actual measurement, the antenna array constituting the rhombus frame is fixed. One set of two opposite probes of the antenna array is perpendicular to the sea level, and the other set is parallel to the sea level. At this time, the angle θ between the antenna array and the submarine cable, the vertical distance x of the projections of probes 1 and 2 in the antenna array to the submarine cable, and the buried depth _h0 are all unknown. Since the submarine cable is connected with alternating current and electromagnetic waves are propagated outward, the coil on the probe rod in the electromagnetic field will generate an induced electromotive force. Here, the angle between the antenna array and the submarine cable refers to the angle between the probe rod placed horizontally relative to the sea level in the antenna array and the submarine cable. According to the principle of electromotive force generation, when the probe rod and the submarine cable form a certain angle, the probe rod Only then will the induced electromotive force be generated by the electromagnetic wave of the submarine cable. The operator sends an instruction through the host computer software to control the data transmission module to start collecting the data of the induced electromotive force on the probe. According to the collected data, compare the data of the two probes parallel to the sea level, number the one with the larger induced electromotive force value as 3, and the other as 4, and then number the two probes perpendicular to the sea level as 1, 2. Substituting the absolute value of the induced electromotive force measured by these four probes into the theoretical formula for calculation, the angle θ between the array and the submarine cable at the point where the center of the array is located can finally be obtained, and the projection of the vertical probe of the array to the submarine cable The vertical distance x of , and the buried depth h ₀ , h ₀ is the difference between the solution h in the formula and the seabed depth h′ measured by the altimeter, where the theoretical formula is as follows:

When the projection of the antenna array is on one side of the cable:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="h"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">h</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="h"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">h</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="L"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">L</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="L"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">L</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}\end{array}\right.$

When the projection of the antenna array is overlaid on the submarine cable:

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; L</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&CenterDot;</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="h"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">h</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; \&epsiv;</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; K</span>}<span\; class="notranslate">\; \&CenterDot;</span>\frac{\mathrm{<span\; class="notranslate">\; h</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="h"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">h</figure-callout></span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}\\ {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="L"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">L</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="L"\; filenames="HDA00002223560300031.png"\; state="\{\{state\}\}">L</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; sin</span>}\mathrm{<span\; class="notranslate">\; \&theta;</span>}\end{array}\right.$

The above two formulas are respectively for the situation when the submarine cable is located on one side of the array and the submarine cable is located in the middle of the array. In the actual measurement, the submarine cable detection antenna array is fixed on the ship or in the underwater electronic cabin, and the antenna array is connected to the data transmission module. The data passes through The data acquisition box is transmitted to the host computer in real time. The operator operates the software on the host computer, clicks to start collecting instructions, and the sensor antenna array will transmit the value of the induced electromotive force of each probe to the host computer in real time. Data collection is continuous, according to the time interval of data collection, the data in each time interval corresponds to a measurement point i, i=1, 2, 3..., that is, a measurement point corresponds to a section of waveform data, by comparing the current measurement The probe data of the two parallel sea levels corresponding to the previous measurement point, if the waveform change trend is the same, it belongs to the case where the submarine cable is located on one side of the array, and if the change is opposite, it belongs to the case when the submarine cable is located in the middle of the array. Among them, K is a parameter proportional to the magnitude and frequency of the current in the cable, the magnetic permeability of the probe, the number of coil turns of the probe and the effective area of the cross-section of the probe. It can be obtained from the formula without prior calculation. L ₁ is the center of the rhombus array The distance from the two probes perpendicular to the sea level, L ₂ is the distance between the center of the diamond array and the two probes parallel to the sea level, ε ₁ , ε ₂ , ε ₃ and ε ₄ are the four corresponding numbers on the antenna array The value of the induced electromotive force measured on the probe, when collecting the induced electromotive force on the probe, for the waveform of the induced electromotive force within the measurement time interval corresponding to each measurement point, take the stable average value of the waveform of the induced electromotive force of each probe, as The measured value of this measurement point.

During the actual measurement, the submarine cable detection antenna array is fixed on the ship or in the underwater electronic warehouse, and the antenna is connected to the data transmission module, and the data will be transmitted to the host computer through the data acquisition box. The operator operates the software on the host computer, clicks to start collecting instructions, and the sensor array will transmit the value of the induced electromotive force of each probe to the host computer in real time. After collecting multiple sets of data, take the stable average value of the induced electromotive force waveform of each probe, compare the data of the two probes parallel to the sea level, number the one with the larger induced electromotive force value as 3, and the other number as 4, Then number the two probes perpendicular to the sea level as 1 and 2, and substitute the induced electromotive force values of these four probes into the above formula to obtain the calculation result. Each different measurement point can get a set of buried depth, deflection angle and offset distance of the submarine cable, that is, the angle θ between the array and the submarine cable at this point, and the vertical distance from the projection of the vertical probe of the array to the submarine cable x. Through each measurement point, draw the specific position of the submarine cable with a curve according to the measurement results (offset distance and deflection angle) and GPS positioning, and at the same time use the altimeter to measure the depth of the seabed at different points. At each measurement point, use the formula Subtract the seabed depth h′ from the h obtained in to obtain the buried depth h ₀ . In this way, the specific results of the buried depth and routing of the submarine cable can be obtained.

Because the utility model only uses a single sensor unlike the traditional method, it needs to measure at multiple points to obtain a set of parameters of the buried depth and direction of the submarine cable, and will produce misjudgment results. The four-rod type with adjustable side length The submarine cable detection antenna array is composed of 4 probes, and can adjust the side length of the rhombus array by changing L ₁ and L ₂ according to different on-site actual measurement conditions. For example, the actual on-site measurement value is too small, indicating that the measurement point It is far away from the submarine cable, and the side length of the array can be appropriately adjusted to make the measured value of the relative probe change significantly. The result obtained by substituting the measured value into the formula is more accurate, and the buried depth of the submarine cable can be quickly obtained by substituting the measured value into the formula , direction and other routing information, can achieve the best measurement effect, with real-time and higher accuracy.

Claims (2)

1. cable exploring antenna battle array in four bar type length of side adjustable types sea is characterized in that comprising aerial array and data transmission module, and the data of aerial array are transferred to host computer by data transmission module in wired mode;

Described aerial array comprises four probes and a rhombus framework, be wound with coil on each probe, probe adopts magnetic material, constitute the inductance type probe, four probes are separately fixed at the place, four summits of rhombus framework, no datat independent of one another connects between the probe, each probe is connected to data transmission module by cable respectively, four probes all are positioned at the same plane of rhombus, each probe is axis with the rhombus diagonal line at place separately, the described rhombus length of side can be regulated, and realizes regulating the distance on rhombus frame center to four summit.

2. the extra large cable exploring antenna of four bar type length of side adjustable types according to claim 1 and 2 battle array is characterized in that data transmission module comprises the RS-232 bus, electric current loop serial line interface and data acquisition box, the collection of PC control data and transmission.

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