ES2363149A1 - Remote station, system and monitoring method of environmental electromagnetic field in real time. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Compact and fixed remote station, of control and permanent monitoring in broadband of the electromagnetic field in urban environment, in real time and controlled from a remote control center through intranet/internet. It is formed by four subsystems; the first two allow the recording and capture of the signal in real values, in all the admitted frequency bands, in a range between 100 mhz and 6 ghz, for each moment of time, as well as the registration and pre-processing of the same. The third subsystem is in charge of the storage and processing of the information, for later re-transmission to the remote control center. The last subsystem is constituted by a remote control and storage center that will allow the processing of the information for the presentation of the results in the appropriate format. (Machine-translation by Google Translate, not legally binding)

Description

Remote station, system and method of environmental electromagnetic field monitoring in time real.

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Field of the Invention

The present invention relates to equipment and a method for measuring radiation levels electromagnetic and its frequency characterization through a network of fixed broadband monitoring stations (100 MHz-6 GHz).

Background of the invention

The constant development of new technologies and the communication society is causing a considerable increase in both the number of stations, and in the power level of radio emissions. These increases occur in both licensed band and free band, where it is even more difficult to comprehensively control the levels of power to which it is transmitted.

Additionally, the ignorance of characteristics and location of radio stations, because the location maps of the locations, it is an extra impediment that makes it very complicated a real knowledge of the variations of the field levels in urban environments

For all these reasons, a more rigorous control of radio emissions, and of the location of the stations, the municipal entities being the responsible for such control being carried out in a manner correct, useful and real. The broadcasting stations have contracted a power (below the safety threshold), so they must issue meeting these limits; however, there are times when this threshold is exceeded, emitting at a higher power so punctual. These peak emissions are masked, since the regulations require that the temporary average of measurement (6 minutes) be keep below thresholds, so emissions that they can far exceed the limits, if they are short in time, go unnoticed for current monitoring systems.

Specifically, according to Art. 8 7d of Royal Decree 1066/2001 of Spanish legislation, current regulations require that emissions be kept below thresholds that are established a priori , with the measures collected averaged over six-minute periods.

As already mentioned, this type of measure does not it is enough to be able to objectively assess that the exposure limits at all times, not to estimate the interaction of electromagnetic fields over an area of the population, since the intensity peaks are masked by the temporal averaging of the signal. In such a way that a timely issuance for a short period of time, exceeding threshold required, goes unnoticed when performing the averaging Temporary intensity levels in six minutes if the rest It has abundant signal valleys.

Current magnetic field monitoring systems record the signals, average the value temporarily, and compare this average value with a certain threshold, corresponding to a frequency band. In such a way that most commercial systems for environmental monitoring of the electromagnetic field ( WaveControl: SMRF system; Satimo RF Safety: Insite Box 80; Gigahertz: High frequency measurement with selective filtering ) and mobile field level measurement equipment ( Rohde & Schwarz, Narda, Satimo or Wavecontrol ) do not allow real-time monitoring and recording of peak power values captured at a given location, differentiated by service and frequency.

Thus, the need to characterize and correctly and usefully control radio emissions through a system that allows measuring the peak intensities of the electromagnetic field, at every moment of time (can be considered real time), and that allows the registration of differentiated way for narrower frequency bands than collected by regulations.

The telemetry stations mentioned above perform 24-bandwidth power density readings hours of the day, 365 days a year, with a temporary resolution around at 1 minute, by an isotropic sensor or by a probe triaxial These measures are basic measures of power levels and quality of mobile phone services: GSM 900, GSM 1800 and UMTS. However, the temporary resolution of one minute is excessive for to be able to carry out a real-time control, so if you want do studies for every moment of time, this resolution of detection system should be reduced considerably.

Communication between the stations that make up the system and the control center is usually carried out by mobile technology: GSM, GPRS or UMTS modem controlled by microprocessor. The capture and registration system is interrupted during the time the modem is turned on and the duration of the temporary window for sending data, so that the corresponding measures for that interval are lost. Additionally, the wireless data transmission mechanism itself to the control center introduces environmental electromagnetic pollution, so that a desirable feature for an environmental monitoring system would be that the data recording was not interrupted at any time, and that the system of sending data to the control center did not involve an increase in radiation.

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The mentioned industrial solutions have been deployed in various municipalities in Spain, such as Valencia, Barcelona or Murcia, among others, where a portal of citizen access for the visualization of historical data registered, with a period of daily refreshment of the data, and offering graphs with the specific density levels of power and quality of service, as well as with the average values obtained over time intervals.

Some similar inventions for detection of broadband environmental electromagnetic fields, are based on Indirect mobile devices, including a optical detector sensitive to electromagnetic radiation (US 7209613) able to measure the amount of energy absorbed by various sensors This type of measurement method is not accurate, no It has good frequency resolution and does not allow registration continuous and real-time field levels electromagnetic.

Other type of fixed remote stations electromagnetic surveillance, employ a threshold comparator with the result of time multiplexing of the outputs given by the set of three orthogonal radiant elements for a record independent (patent ES2273928-T3). These stations are selectively sensitive at least in two bands of electromagnetic field frequencies. The measure is based on a broadband average compared to a service threshold threshold of radio frequency. The system has communication interfaces GSM mobile and serial communication via RS-232 for communication with a central control unit. They have also of a unit of data processing and storage of those field levels that exceed the preset threshold. By Therefore, this system is not sensitive to more than two bands of frequencies, does not store all detected field values (but only those that exceed certain set limits), and the values of field are not recorded and monitored in real time so automatic

Analyzing all the mentioned background, a system is designed that addresses the deficiencies perceived in the existing environmental monitoring systems, through a network of sensors deployed by the geography of the municipality of origin study, which measure the intensity of the electromagnetic field emitted by the different emission sources of the environment, in real time, for each of the 30 kHz bands into which the working spectrum is divided (from 100 MHz to 6GHz), collecting a total of 236000 data every 1.6 seconds, so that there is an effective measure that guarantees that the thresholds marked by regulations in no time.

With the present invention, this system of signal capture and processing allows map generation real radio stations for every moment of time. For what I know they can monitor the radio levels of the municipality of spatial way, generating radio maps for all the municipality in every moment of time; as well as temporarily, tracking each of the zones.

Additionally, the system has a system of mobile measure that allows movement to areas where detect that the limits are being exceeded, and allow location of the transmitting antenna that violates the regulations for determined frequency

Description of the invention

The invention relates to a remote station compact and fixed location, permanent monitoring and control in broadband of the electromagnetic field in urban environment the 24 hours of the day, controlled from a control center through Intranet / Internet

The present invention has therefore been designed to provide a solution that meets all needs before indicated and that overcomes the deficiencies presented by others environmental monitoring systems through a series of characteristics, since the system of the present invention:

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Make the capture, the storage and field strength monitoring electromagnetic in absolute value (not by means of averaging), to every moment of time, so it can be processed later as if it were real-time information, and with a Temporary resolution of up to 1.6 s.

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It works in a wide range of working frequencies, ranging from 100 MHz to 6 GHz, band that includes most radio emissions characteristics of the urban environment: digital terrestrial television, FM radio, WIFI access points, mobile phone base stations GSM and UMTS, WiMax, point-to-point connections at frequencies proprietary or free.

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Record the field strength electromagnetic for each of the subbands of 30 kHz into which each of the 500 input bands is divided MHz, so a high frequency resolution is obtained.

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Perform scanning and scanning of frequencies sequentially and automatically, such that, each 1.6 s, the entire frequency range is swept, 236000 are collected samples and detection is automatically restarted at the first window (from 100 MHz to 500 MHz), without removing any data from the collected.

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Make a continuous registration of the electromagnetic field power density, in which the sending to the central processing block is done after scanning everything The frequency range.

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Send the information through broadband or narrow cable, depending on the location of the Remote station and its characteristics.

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Reduce the length of the mast to a maximum height of 1.5 meters (since the antennas are placed on a cylindrical central core), allowing the physical separation of the antennas and facilitating that they do not fit each.

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It has a system of GPS synchronization, which allows to have the system Temporarily synchronized with the satellite system.

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Collect the results on maps radioelectric and through historical graphs that show the intensity variations of the signal collected in absolute values, without averaging them, and with an automatic refreshment.

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The system consists of four subsystems:

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A) Acquisition subsystem or local detection (1).

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B) Monitoring subsystem and continued registration (2).

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C) Processing subsystem and communications (3).

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D) Control subsystem, remote display and storage (4).

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The first two subsystems allow the Signal recording in the manner specified above and allow signal pickup in all supported frequency bands for every moment of time, as well as registration and preprocessed from the same. The processing and communications subsystem is responsible for the storage and processing of information, for later forwarding to the remote control center through the Communications subsystem The last subsystem is constituted by a remote storage and control center that will allow the information processing for the presentation of Results in the appropriate format.

Brief description of the drawings

Then it goes on to describe very brief a series of drawings that help to better understand the invention and that expressly relate to an embodiment of said invention presented as a non-limiting example of is.

Figure 1 shows a diagram of the operation of the remote station, with the inputs and outputs of which consists.

Figure 2 shows the front view of the antenna used in the remote monitoring station.

Figure 3 shows the top view of the electronic device associated with the antenna and located in its base.

Figure 4 shows a schematic of the subsystem of monitoring and continuous recording (2).

Figure 5 shows a schematic of the subsystem of processing and communications (3).

Detailed description of the invention

The present invention relates to a station Compact remote, and fixed location, to detect and report electromagnetic field levels in your environment in a range of frequencies between 100 MHz and 6 GHz, where include most radioelectric emissions characteristic of urban environment: digital terrestrial television, FM radio, points of WiFi access, GSM and UMTS mobile phone base stations, WiMax, point-to-point connections on proprietary or free frequencies. After each frequency band sweep, the information collected by The antennas are processed and stored in the unit's memory processing center where it is encapsulated and sent to the center of remote control.

The system is formed, as shown in Figure 1, by four subsystems:

A) Local acquisition or detection subsystem (one).

B) Monitoring and recording subsystem continued (2).

C) Processing and communications subsystem (3).

D) Control, display and control subsystem remote storage (4).

The following details each one of the components.

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A) Local acquisition or detection subsystem (1)

This subsystem consists of an antenna of own development, consisting of twelve omnidirectional probes integrated, placed on a cylindrical core, which adjust automatically and sequentially the different center frequencies of reception. The working frequency range of the system is set between 100 MHz and 6 GHz. In this broadband range are including most of its own radio emissions of the urban environment: television, radio, mobile telephony, links dedicated radio, among others.

As shown in Figure 2, the measurement of the electromagnetic field level of the environment of each station Remote monitoring is carried out by a grouping of integrated omnidirectional antennas (21), of own development, where the different ones are adjusted automatically and sequentially central reception frequencies by varying the lambda parameter of the antennas, with a channel width of 500 MHz and a frequency reception center, defined as the median value of the window in question. SMA connectors allow 6 to be reached GHz, they would even allow to capture signals at a higher frequency.

Each of the antennas has a length different depending on the lambda parameter that allows to capture the signal of one of the 500 MHz frequency bands into which it is divided The working frequency range. Each antenna (21 ') of the grouping of antennas (21) in turn has an LNA (amplifier of low noise) specific to your work band.

The channels obtained are the following:

one.

100 MHz-500 MHz

2.

500 MHz- 1000 MHz

3.

1000 MHz-1500 MHz

Four.

1500 MHz-2000 MHz

5.

2000 MHz-2500 MHz

6.

2500 MHz-3000 MHz

7.

3000 MHz-3500 MHz

8.

3500 MHz-4000 MHz

9.

4000 MHz-4500 MHz

10.

4500 MHz-5000 MHz

eleven.

5000 MHz-5500 MHz

12.

5500 MHz-6000 MHz.

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These frequency bands will fragment subsequently, in modules external to the antenna, in wide channels narrow band, 30 kHz and optionally, on 300 kHz channels. The measurements of the level of the surrounding electromagnetic field are will perform at the center frequency of each of the channels straits into which each 500 MHz primary channel is divided. This way the measurements are made by scanning and scanning fine spectrum, analyzing electromagnetic pollution of detailed way.

The twelve antennas (21 ') that form the grouping of antennas (21) of the local acquisition or detection subsystem (1) they are placed on a cylindrical central core (28) (see Figure 3) which allows to reduce the length of the mast to a maximum height of 1.5 meters, allowing the physical separation of the antennas and facilitating that they do not fit together.

Each antenna is responsible for:

- Automatic and sequential capture of power levels in each of the 500 frequency bands MHz into which the input frequency range is divided. The module own antenna control (23) select the band of frequency to be explored in the acquisition module using either a type 485 or TTL communication.

- Sending the RF signal (25) and data (27) to the monitoring and continuous recording subsystem (2), external antenna system, located at the base of the grouping of antennas (21). For automatic antenna control there is a associated electronic device, an antenna selector (22), which is the one in charge of selecting the antenna that measures at every moment through a switch, capable of governing four antennas at once, and which turns off or on each of them depending on the band of frequencies to be measured within the sequential band scan, and giving In this way, the orders coming from the module control (23) of the antenna. From the antenna selector (22) the output signal (25) of the antenna for treatment in the monitoring and recording subsystem (2). Of the control module antenna (23) outputs a signal (27) that contains the captured data and which are also sent to the external subsystem (2) for processing

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In the central control and communications module of the antenna are different (in this case five) communication interfaces on coaxial cable, with which communicates the antenna control module with the different elements and the reception module is interconnected with the system processing, storage and sending of data to the center of control.

Additionally, in a preferred embodiment, the antenna integrates a GPS module (24) to obtain the time and the precise time required to identify each record in the time of the measured environmental electromagnetic field values by antenna. Said signal (location and time signal (26)) it is sent to the antenna control and to the external processing system of signal. This time will be common to all the teams that will make up the complete system because they use the precision of the clocks of Cesium of the GPS satellite system.

Figure 3 shows schematically the top view of the electronic device associated with the antenna and located at the base of the antenna, inside a housing that serves as isolation. The antenna selector (22) comprises, in the embodiment preferred of Figure 3, three radio frequency switches (29), each one in charge of controlling a group of four antennas (21 ') different, turning off or on each of the antennas in function of the control module orders (23).

The central core of the receiving device It is composed of an SMA coaxial cable input connector, and a three-input RF switch that carries the signals of radiofrequency of each branch of four channels to said connector SMA

The antenna is powered by a power and data connection of type 485 and / or TTL, so 9 volt signal and supply voltage circulate parallel to the coaxial cable, offering a secure connection and robust in broadband, up to 10 Mbps of bandwidth that It allows a transmission distance of the order of 50 meters. And in the case of a power connection plus data, TTL that allows a transmission distance of less than 5 meters.

The central control system is powered by 9 volts, using this voltage on two voltage regulators of 5 and 3.3 volts in continuous:

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The first one, the 5 volts, controls the on and off of the elements circuit electronics, such that in each window frequency only the antenna, the components are active circuits and the integrated low noise amplifier (LNA) adequate, while the rest of the antennas do not receive power and do not interfere with the capture of the signal. The function of synchronization in the connection and disconnection of the switch and the LNA suitable is carried out by a microcontroller.

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The second regulator, 3.3 volts, feeds a microcontroller that regulates the process of sequential window jump and, therefore, is responsible for sending the orders for the control of the elements of the antenna system involved in synchronization and window definition temporary activation and deactivation of duration for each of frequency bands, switches and amplifiers, as has been commented above.

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In the central control and communications module five communication interfaces are distinguished from the antenna coaxial cable:

one.

The First is the antenna itself, of the registered signal.

2.

The second is the device sync input GPS

3.

The third is composed of four communication cables with the microcontroller, located at the base of the antenna, and that leads to select the corresponding antenna.

Four.

The fourth is the direct connection of power signals to 9 volts and 5 volt digital control signals.

5.

The fifth corresponds to the coaxial cable output of the signal received from each of the 12 available antennas, and that allow take it to the stage of processing, treatment, storage and subsequent communications.

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B) Monitoring and continuous recording subsystem (2)

This subsystem is responsible for dividing the input bands in minor sub-bands in which field measurements will be performed, and it is formed, as shown in Figure 4, by the following blocks:

I.

Filtering module of the input signal (7): First block of the subsystem that receives signals from the antenna group (21) of the acquisition subsystem or local detection (1). The signals from the antennas reach a switch, which also reaches the self-calibration signal. Using a new switch, the appropriate filters are selected, according to the frequency band corresponding to the antenna from which The signal arrives. So, at this stage it is where they are selected sequentially the different bands in which the spectrum is divided of working frequencies with a fixed bandwidth of the band 500 MHz intern.

II.

Amplification module or low noise amplifier (8): The signals already filtered in their frequency band require a amplification stage in low noise, by LNA amplifier, already that the input signals are extremely small, and must be differentiate the best possible noise to maintain a relationship signal to adequate noise, making the dynamic range of the signal of information is sufficient for further processing, and is not introduce errors due to signal masking by noise.

III.

Selection module (9): Stage synchronized by clock for turning on and off the previous devices, and to control which channels are active at all times. Is a stage via connecting cable that links the filtering stage and amplification with the processing stage.

IV.

Automatic and sequential selection module of frequency f 2 (10), dividing the input into 30 kHz bands, with central frequency f_ {2}: Responsible for performing the synthesis of indirect frequency formed by a set of seven loops of phase tracking, PLL (controlled by the DSP (17)), plus one additional control and interconnection with the central device of supervision. This last PLL provides the reference signal internally generated, for loop control (tracking loop PLL phase) and to obtain a stable output signal, depending on of that reference. With this configuration of PLLs, and characteristics of them (which can register 150000 values per second), the band can be divided into 30 kHz channels, being able to cover the entire input band (100 MHz-6 GHz) in 1.6 s, and recording a total of 236,000 samples in each scan. It is, therefore, this stage the responsible for dividing the input frequency band into channels 30 kHz, whose center output frequency f_ {2} varies sequentially at the output of the PLL subsystem to perform the scanner of the working frequency range and being at this frequency at which the level of contamination is measured environmental electromagnetic. The frequency scanner is sequential and automatic, so when you finish each sweep in the last window, corresponding to 6 GHz, will restart the detection in the first window, corresponding to the range of 100 MHz to 500 MHz. This module has calibration inputs, which come of the DSP, to allow to adapt the measures according to the outdoor conditions

V.

Variable digital attenuation and detection module (11): A variable digital attenuator is placed at the output of the PLL after an amplifier to be able to measure the output signal of each PLL with a rear field meter. This meter measures with what power goes out each PLL, and this power is adjusted with the DSP to standardize them and ensure that in the next stage, that of heterodyned, the output is stable.

SAW.

Initial mixing module (12): In the stage of mixed, the output obtained is equal to the sum of the contributions from the antenna and the reference of the phase tracking ties, which are stable, in the form f_ {1} + f_ {2}, where the frequency f_ {1} corresponds to the frequency of the previous stage, and f2 is a fixed 915 MHz. the signal is then amplified and filtered by a filter band pass that has preset characteristics, with a configuration of the band of step that allows to eliminate the spurious lateral components. The filtered output signal is Go to the next mixing stage.

VII.

Intermediate mixing module (13): In the stage of mixed intermediate, the previously filtered signal is heterodyned with a frequency of 10.7 MHz, and an amplification is performed and subsequent filtering.

VIII.

Final mixing module (14): At this stage of final mixing, the filtered signal is heterodyned with a frequency 4.55 KHz and subsequent amplification and filtering is performed, in such a way that at this point there is already a channel of 30 kHz

IX.

Power detector (15): This is a detector which measures the signal strength of the 30 kHz channel. It's about a detector that converts an input radio frequency signal into a logarithmic output scaled in decibels representing the RSSI parameter. The different values at each scan time are those that register, process, store and send to the system of real-time control and monitoring. A detector is used Logarithmic high bandwidth, low noise, high precision and temperature stability, and stable dynamic range up to 8 GHz. This detector uses a cascade amplifier chain, obtaining high stability and sensitivity.

X.

A / D and D / A converters (16): Two differ Conversion stages The output A / D converter performs the analog to digital conversion at the output, that is, digitizes the logarithmic detector output and takes it to the DSP (17) for the processed and sent to the remote control center. Digital conversion Analog is the same as the calibration inputs of the different modules that make up the core of the system, such as the logarithmic detector case. These entries will be used in a First phase of calibration and commissioning.

XI

Processing device (17): Means of data processing (e.g. a DSP) for control and synchronization of all stages and the acquisition process, preprocessing and sending data to the processing module through the integrated communication interfaces. You can have ports of communications (18 ') and calibration input / output ports (18). The DSP has an RS485 port that communicates with the module processing connected to the device, through a 10 channel Mbps

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In the monitoring and recording subsystem continued (2) a signal generator is also present reference for synchronism and a power supply stable.

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C) Processing and communications subsystem (3)

This subsystem communicates with the DSP (17) and is the person in charge of processing information and sending data, for what consists of the following elements and features:

I.

Information storage: Information detected by the antennas and processed by the system is stored in the memory of this central processing unit. Each entry in Memory consists of at least four basic fields: antenna identifier, the analyzed radio channel and the capture frequency, received power density, and date and time of capture, with an accuracy of milliseconds. How security mechanism, the system has a storage of records in non-volatile internal memory, with storage capacity up to 6 days of registrations, in case of fall of communications.

II.

Information encapsulation: Information from system output, previously digitized, has to be packaged for sending to the control center through the interface of relevant communication To do this, after each sweep of frequencies, from 100 MHz to 6 GHz, the information that is encapsulated has been stored in processor memory, with a header which includes the station identifier, and is available for sending through the system's communications interface. The Basic frame consists of the following fields: identifier of the remote station (from 0 to 10,000), GPS coordinates (length and latitude in decimal), station height (in meters), frequency detection (100 MHz to 6 GHz), power density (in units logarithmic or dBm), date and time of registration (accuracy of milliseconds), error correction sequence forward, FEC (usually 4 bytes).

III.

Communications interface: The information is compress before sending it, and the data is sent through Intranet / Internet by ADSL to a control center, so sequential, and after each full sweep of the frequency band of work. The interface and the means of communication used vary depending on the location of the remote station and its features, being able to be in-band cable communications wide

IV.

Transmission medium between monitoring station and control center: Whenever possible, connection is established in Broadband for communication between monitoring stations and the control center. In this way a transmission is obtained safe and reliable and no interference source is introduced associated with the broadcast of the remote station itself.

V.

Remote access: The computer control system has been designed for direct integration into the Internet, allowing an authorized user can control the stations from any Internet connection point through the use of tunnels Point-to-point secure communication.

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D) Control, display and storage subsystem remote (4)

This subsystem refers to the center of remote control, which is the nerve center of the network of stations of monitoring. A star network architecture is established master / slave type in which the control center is the master of the system and can send orders to any station in the network synchronously (or programmed) or asynchronously upon request. The system control consists of a storage subsystem of the information collected in the frames that arrive through the communications interface This system is managed by a database engine, which allows you to keep a historical record of all values received from the different stations.

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The results are collected on maps radioelectric and historical graphs, in which the variations in the intensity of the signal collected in values Absolute, without averaging them, and with automatic refresh every time New data arrives. The control system consists of a subsystem of visualization and control based on a software application that Run on a server or PC and that allows:

- View the results sent by the remote stations on radiological maps with temporary refreshment automatic.

- Display the data stored in graphics historical with automatic temporary refreshment and the closest to real time, and with the inclusion of statistical values associated with range of graphic display times (minimum, maximum, value average, value of the cursors).

- Interact with remote stations to through remote. Send orders and slogans. Reconfigure the monitoring station Restart the station. Send requests to force the sending of data stored in the internal buffer of the station in case of communications drop.

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The method of measuring levels of electromagnetic radiation and its frequency characterization is performed through a network of fixed monitoring stations in broadband described above, and through a processing subsystem, monitoring and continuous recording, which could be summarized in the following stages:

1st

Automatic antenna selection and capture of the signal by each of the 12 antennas sequentially and automatic for each of the 500 MHz bandwidth bands into which the input frequency range is divided.

2nd

The antennas, through the electronics they carry associated, perform the selection of work bands for the sequential and automatic processing of field level values collected in real time by activating and deactivating the right devices at every moment of time.

3rd

Preprocessing of the captured signal by synchronizing and dating information (through information provided by the GPS). 4th Treatment and processing of the field values detected. The following are carried out Actions:

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\ vtcortauna Automatic and sequential selection of frequencies within each band, in turn dividing the bands into sub-bands of 30 kHz.

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\ vtcortauna Calibration of the detected signals.

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\ vtcortauna Mixing, amplification and filtering for sequential selection of 30 kHz bands within each 500 MHz input channel.

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\ vtcortauna Logarithmic Detection Conversion of values from electrical units to valid engineering units for field level measurement.

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\ vtcortauna Digitization of the analog output signals of the previous stage.

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\ vtcortauna Encapsulation and processing of the data by the processing unit, with fields intended to include station identifiers, measurement frequency, measured value, unit position, date and time and error control, among others.

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\ vtcortauna Sending the data to the remote control center (4) for storage and final processing.

Claims (11)

1. Remote real-time environmental electromagnetic field monitoring station, characterized in that it comprises: - a local acquisition or detection subsystem (1) of the power density as a function of frequency, which dispose of:

?

a cluster of antennas (21) omnidirectional, being the antennas (21 ') of the grouping of different lengths, associated with different parameter values lambda, and responsible for the continuous collection of the field signal environmental electromagnetic in different frequency bands of job;

?

an antenna selector (22) responsible for selecting, by at least one switch radio frequency (29), the active antenna (21 ') that measures in each moment the electromagnetic field signal;

?

a control module (23) configured to, by controlling the antenna selector (22), perform a sequential scan of the frequency bands of job;

?

a GPS module (24) for the obtaining the necessary time and time to identify each record in time of electromagnetic field values environmental measured by the antenna.

- a monitoring and recording subsystem continued (2), which has:

?

a filtering module (7) of the input signal from the acquisition subsystem or local detection (1), filtering said signal sequentially according to the different working frequency bands;

?

an amplification module of low noise (8) to amplify the filtered signal;

?

a selection module synchronized (9) for the control of active channels;

?

a selection module automatic and sequential frequency f2 (10), comprising a plurality of phase tracking links in charge of sequentially select specific frequencies f_ {2} within each of the bands working frequencies of the signal of input, sequentially dividing the frequency band of Sub-band input signal work with central frequency f_ {2}, said frequency being f_ {2} at which the level of environmental electromagnetic field is measured;

?

a digital dimming module variable and detection (11) responsible for measuring the signals of output of the PLLs and you would adjust to standardize them;

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a mixing subsystem that it comprises at least one mixing module (12, 13, 14);

?

a power detector (15) to convert the resulting radio frequency signal into decibels of the mixing subsystem output;

?

an A / D converter (16) for digitize the analog output signals of the detector power (15);

?

data processing media (17) responsible for controlling the automatic selection module and sequential frequency f_ {2} (10), of synchronizing the stages, of receive the digital signal from the A / D converter (16), and from send them to the processing and communications subsystem (3).

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2. Remote field monitoring station environmental electromagnetic in real time according to claim 1, where the subbands have an amplitude of 30 kHz 3. Remote field monitoring station environmental electromagnetic in real time according to any of the previous claims, where the monitoring is carried out in a range of frequencies between 100 MHz and 6 GHz 4. Remote field monitoring station environmental electromagnetic in real time according to any of the previous claims, wherein the antennas (21 ') of the grouping of antennas (21) are of different length with the variable lambda parameter, with a center frequency and a width of 500 MHz channel 5. Remote field monitoring station environmental electromagnetic in real time according to any of the previous claims, where the antenna array (21) comprises twelve omnidirectional antennas placed on a core cylindrical central (28).

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6. Remote field monitoring station environmental electromagnetic in real time according to any of the previous claims, wherein the processing means of Data includes a digital signal processor, DSP (17). 7. Remote field monitoring station environmental electromagnetic in real time according to any of the previous claims, further comprising a processing and communications subsystem (3). responsible for storing electromagnetic field values pre-processed, to process the information correctly for later forwarding to at least one center of remote control. 8. Remote field monitoring station environmental electromagnetic in real time according to any of the previous claims, further comprising a control, display and remote storage subsystem (4) that allows the control of the station remotely, from at least one control center located in a different location from that of the station. 9. Field monitoring system environmental electromagnetic in real time, which comprises at least a remote electromagnetic field monitoring station real-time environmental according to any of claims 1 to 8, and a remote control center responsible for receiving both of the at least one remote station, as of several, the information relative to the power density of the electromagnetic field environmental measure. 10. Field monitoring system environmental electromagnetic in real time according to claim above, where the remote control center is set to remote control the remote station. 11. Real-time environmental electromagnetic field monitoring method, performed through at least one remote real-time environmental electromagnetic field monitoring station according to any of claims 1 to 8, characterized in that it comprises:

-

a stage of automatic antenna selection and signal acquisition by part of each of the antennas (21 ') of a group of antennas (21) omnidirectional that allow to capture the signal so sequential and automatic in different frequency bands of job;

-

a stage of selection of workbands for processing sequential and automatic field level values collected in real time;

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a pre-processed stage of the signal captured in the central unit of antenna cluster processing (21) by synchronizing and dating the information;

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a processing and processing stage of the detected field values, which includes:

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automatic selection and sequential frequencies within each band, dividing the bands in subbands with a frequency width predetermined;

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signal calibration detected;

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mixed, amplification and filtered out;

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detection of the power of the signal for each channel;

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signal digitalization analog output power detection stage previous;

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encapsulation and processing of data for sending to a control center (4) through a communication interface