CN1241885A - Apparatus and method for determining location of interference source and for measuring interference signal emitted therefrom - Google Patents

Abstract

An apparatus and method for determining the location of an interference source and measuring at least one signal characteristic of at least one external signal emitted by the interference source in a cellular mobile telecommunication system, wherein the apparatus comprises: an antenna for detecting the at least one external signal a motor, used to drive the antenna to rotate; a low noise amplifier, used to amplify the at least one external signal detected by the antenna; a spectrum analyzer, used to measure the at least one signal characteristic of the amplified signal; and control processing device for controlling the motor and the spectrum analyzer.

Description

Determine the apparatus and method of the interference signal of position of interference source and measurement interference source

The application requires that to be submitted to korean industrial property office, sequence number be No.98-26411 on July 1st, 1998, is entitled as the priority of the patent application of " apparatus and method (Apparatus and Method ForMeasuring Interference Source) of measuring interference source ", and it is for reference to list its content at this.

The present invention relates generally to a kind of cellular mobile telecommunication system, relate in particular to a kind of definite position of interference source and measure the apparatus and method of the interference signal that interference source sends.

Cellular mobile telecommunication system is divided into a plurality of sub-districts with whole service area, and each sub-district provides service by the base station.By placing the base station of each cell centre, the user can communicate when each moving between cells each other.This project organization of cellular system can make travelling carriage, and the sub-district of service is provided and is entered by a base station can persistent call when providing another sub-district of service by another base station shifting out.In addition, this project organization that is divided into a plurality of sub-districts with regard to service area makes and reuses same frequency and become possibility.This has just improved the frequency service efficiency, makes system can hold more user.For example, the mobile communication system that adopts code division multiple access (CDMA) technology send signal to share with each user frequently before, by multiply by an intrinsic code, and, on a carrier wave, send signal by spread bandwidth.

Because by the interference that each provenance produces, the performance of cdma system often descends to some extent.For example, the signal between each neighbor base station causes interactive interference.But, general by the suitable position of selecting each base station in mobile communication system, and make the interactive interference minimum that causes by the signal between each neighbor base station.This is important optimizing the cdma system aspect of performance.Therefore, when selecting base station location, measure external interference signals, be interfered on the position of effect of signals minimum so that the base station is positioned at this base station with special frequency band.

The U.S. Patent No. 3,783,448 that is entitled as " device (Apparatus For Measuring ElectromagneticRadiation) of measuring electromagnetic radiation " discloses a kind of electromagnetic antenna of reception and detector of using and has measured the device of electromagnetic radiation.But, fail on the base station to determine and to measure fully the source and the intensity of the interference signal that occurs in the mobile communication system as disclosed this device of other prior art equipment.

The present invention attempt to provide a kind of be used to use by the directive antenna of driven by motor rotation determine to send interference signal or external signal interference source the position and measure the apparatus and method of at least one signal characteristic of interference signal.

Device according to one preferred embodiment of the present invention comprises: antenna is used to detect this at least one external signal; Motor is used to drive this antenna rotation; Low noise amplifier, be used for to by this antenna detection to this at least one external signal amplify; Spectrum analyzer is used to measure this at least one signal characteristic of amplifying signal; And processor controls, be used to control this motor and this spectrum analyzer.

Preferably this antenna is a directive antenna.In addition, this antenna YAGI antenna preferably.Moreover preferably this antenna has narrow beam width.Best, the gain of this low noise amplifier is greater than 35dB.

Described motor is scheduled to the anglec of rotation according to the beamwidth of antenna with described antenna rotation, and sends the information of the relevant anglec of rotation to described processor controls.Described processor controls is determined the orientation/time relationship with respect to described motor, and obtains the measure signal intensity of correspondence on time aziniuth from described spectrum analyzer, shows measure signal intensity according to orientation/time relationship on screen.

The preferred method of the present invention comprises the steps: by received this at least one external signal by antenna; By low noise amplifier received external signal is amplified; Analyze amplifying signal by spectrum analyzer; With recently represent analytic signal with interference radiating way-power level.This method also comprises the steps: to rotate this directive antenna; The rotary speed of this directive antenna is transformed into the orientation; With power level according to each azimuthal measurement analytic signal.

Best, the gain of this low noise amplifier is greater than 35dB.In addition, best, with interference radiating way-power level represent recently that the step of analytic signal shows overlapping result and no matter measuring period how.

To following detailed description of the present invention, above-mentioned purpose of the present invention, feature and advantage will become clearer with reference to accompanying drawing, in the accompanying drawing:

Fig. 1 is that the present invention is used to determine to send the position of interference source of interference signal and the block diagram of the device of measuring interference signal intensity;

Fig. 2 is the position of the interference source that measures of expression the present invention and the figure of amplitude; With

Fig. 3 is the flow chart that the present invention measures the method for the interference signal intensity of being sent by interference source.

The preferred embodiments of the present invention are described below with reference to accompanying drawings.In the following description, will known various functions and structure be described in detail, obscure because this may cause the details of necessity.

The invention provides a directive antenna, this antenna can be found out the position of interference source that sends the interference signal of disturbing with the signal coherence of being sent by base station system.The present invention also provides the method for determining to send the position of interference source of interference signal and measuring interference signal intensity.

In the present invention, the signal strength signal intensity that the direction of measurement antenna is received is presented at measurement result on screen or the monitor.The most handy diagrammatic representation result on the screen shows the direction and the amplitude of interference signal.This figure can be used to determine the cell scenario of mobile communication system, and determines in system where the base station to be placed on.

Fig. 1 illustrates the structure that the present invention determines to send the position of interference source of at least one interference signal and measures the device of interference signal intensity.As shown in Figure 1, this device comprises: antenna 100 is used to detect external signal; Motor 200 is used to rotate this antenna; Low noise amplifier (LNA) 300, be used to amplify by antenna detection to signal; Spectrum analyzer 400 is used for the measuring-signal feature, for example the direction of propagation of amplifying signal, amplitude, frequency; With processor controls 500, be used to control motor and spectrum analyzer.

2 and 3 operations of describing apparatus of the present invention below with reference to accompanying drawings.At least the antenna 100 of measuring external signal is directive antenna preferably, and more particularly, antenna 100 is preferably the YAGI antenna with narrow beam width.Motor 200 is preferably stepping motor, and it makes YAGI antenna rotation special angle with respect to the beamwidth of YAGI antenna.If the swing circle of antenna 100 is known, the angle in the time of then can determining measured signal level and amplitude after the rotation for the first time.For example, if swing circle is 4 seconds, be 90 ° of signal levels on the direction then in the signal level of measuring on 1 second, the signal level of measuring on 2 seconds is 180.Signal level on the direction.

Low noise amplifier 300 amplifies signal according to the power level of noise of spectrum analyzer 400.That is, low noise amplifier 300 is amplified to the signal level of input signal the signal level that can be measured by spectrum analyzer 400.The bandwidth of low noise amplifier 300 preferably can be amplified and is suitable for measured frequency band most, i.e. the frequency band that is used by mobile communication system; In addition, the gain of low noise amplifier 300 is more preferably greater than 35dB.AC/DC transducer 600 converts AC (interchange) input to DC (direct current).The AC/DC transducer also reduces the voltage to suitable level, so that suitable voltage is provided for motor 200 and low noise amplifier 300.

With reference to Fig. 1, processor controls 500 comprises PCMCIA (PCMCIA (personal computer memory card international association))-GPIB (general-purpose interface bus) card, and it controls motors 200 by parallel cable 2, and by GPIB1 control spectrum analyzer 400.Processor controls 500 converts the rotary speed of motor 200 to orientation/time relationship, i.e. orientation under the time-division reading on the timepiece dial, and determine the signal level on each time aziniuth, measured by spectrum analyzer 400.Time aziniuth when processor controls 500 is measured motors 200 rotations, and obtain the signal strength signal intensity that measures in each corresponding time aziniuth from spectrum analyzer 400.Measured signal strength signal intensity is presented on screen or the monitor according to the orientation.Therefore, each measurement can be learnt signal level measuring result and corresponding orientation simultaneously.Thereby by shows signal level measurement result and corresponding orientation thereof, the user can determine the interference level on each time aziniuth.

As mentioned above, by structure measurement shown in Figure 1 to interference signal intensity be presented on the screen of processor controls 500.Fig. 2 illustrates the interference source that measures according to the present invention and the position and the amplitude of signal respectively.As shown in Figure 2, along 360 ° of circumference measure signal interference, thereby measure signal strength signal intensity on all directions.By measuring each locational amplitude and utilizing Fig. 2 can determine signal strength signal intensity.For example, determined that the interference on the sense 10 and 20 is the strongest, because the amplitude maximum on these directions.Therefore, can reach a conclusion, on sense 10 and 20, have interference source.

Fig. 3 illustrates the flow chart that the present invention determines the position of interference source and the method for the intensity of measuring the interference signal of being sent by this interference source.Measured information can be used to correctly determine to place the position of base station in cellular system, in this position, the interference shadow that the base station is subjected to is to minimum.This method comprises the steps: to receive at least one external signal (S10) by directive antenna; Amplify received signal (S20) by low noise amplifier with predetermined gain; Analyze amplifying signal (S30) by spectrum analyzer; With recently represent analytic signal with interference radiating way-power level.

Best, this method also comprises the steps: to drive directive antenna rotation (S50) by independent whirligig and independent control device; Be transformed into orientation/time relationship with rotary speed, and measure the signal strength signal intensity (S60) on each time aziniuth this directive antenna.Best, utilizing interference radiating way-power level recently to represent in the step of analytic signal the overlapping result of expression, and no matter measuring period how.

Therefore, the invention provides the apparatus and method that a kind of definite position of interference source is also measured the signal strength signal intensity of the interference signal of being sent by interference source.The instruction that this device sends according to processor controls adopts motor to drive the directive antenna rotation.By the information about the most weak and strong jamming direction and interference signal amplitude under 360 ° of circumference is provided, apparatus and method of the present invention can be used to determine at the during the design of cellular mobile telecommunication system the position of base station.

Although embodiment is described in detail with exemplary forms with reference to accompanying drawing, the present invention can have various forms of improvement and replacement.Be understandable that, can not limit the present invention to disclosed particular form, on the contrary, the present invention covers all improvement, equivalent and the replacement that falls into the spirit and scope of the present invention that limited by claims.

Claims (20)

1. A device for determining the location of a source of interference and measuring at least one signal characteristic of at least one external signal emitted by the source of interference in a cellular mobile telecommunication system, said device comprising: an antenna for detecting the at least one external signal; a motor, used to drive the antenna to rotate; a low noise amplifier for amplifying the at least one external signal detected by the antenna; a spectrum analyzer for measuring the at least one signal characteristic of the amplified signal; and a control processor for controlling the motor and the spectrum analyzer. 2. The apparatus of claim 1, wherein the antenna is a directional antenna. 3. The apparatus of claim 1, wherein the antenna is a YAGI antenna. 4. The apparatus of claim 1, wherein the antenna has a narrow beamwidth. 5. The apparatus of claim 1, wherein the motor rotates the antenna by a predetermined rotation angle according to a beam width of the antenna, and transmits information on the rotation angle to the control processor. 6. The apparatus of claim 1 , wherein the control processor determines an orientation/time relationship with respect to the motor, and obtains at least A measurement result. 7. The apparatus of claim 6, wherein the control processor displays on a screen at least one measurement at a corresponding time orientation. 8. The apparatus of claim 7, wherein the screen displays a location of an interferer and the at least one measurement of the at least one signal characteristic of the at least one external signal. 9. The apparatus of claim 1, wherein the at least one signal characteristic comprises a magnitude of the at least one external signal. 10. The apparatus of claim 1, wherein the low noise amplifier has a gain greater than 35 dB. 11. The apparatus of claim 1, wherein the motor is a stepper motor. 12. A method for determining the position of a source of interference and measuring at least one signal characteristic of at least one external signal emitted by the source of interference in a cellular mobile telecommunication system, said method comprising the steps of: receiving the at least one external signal through a directional antenna rotated by a motor; The received external signal is amplified by the low noise amplifier; analyzing the amplified signal by a spectrum analyzer; and The analyzed signal is displayed on a screen, wherein the screen displays the location of the interference source and at least one measurement of the at least one signal characteristic of the at least one external signal. 13. The method of claim 12, wherein the analysis signal is displayed in terms of interference direction-to-power intensity ratio. 14. The method of claim 12, wherein said method further comprises the steps of: transforming the rotational velocity of the directional antenna into an azimuth/time relationship; and The at least one signal characteristic of the analyzed signal at a corresponding time orientation is measured. 15. The method of claim 12, wherein the gain of the low noise amplifier is greater than 35 dB. 16. The method of claim 13, wherein the step of displaying the analysis signal on a screen includes the step of displaying overlay results regardless of the measurement period. 17. The method of claim 12, wherein the at least one signal characteristic comprises a magnitude of the at least one external signal. 18. An apparatus in a cellular mobile telecommunication system for determining the location of an interference source and measuring at least one signal characteristic of at least one external signal emitted by the interference source, said apparatus comprising: detection means for detecting said at least one external signal; a rotating device for driving the detection device to rotate; amplification means for amplifying said at least one external signal detected by said detection means; measuring means for measuring said at least one signal characteristic of the amplified signal; and Control means for controlling said rotating means and said measuring means. 19. The apparatus of claim 18, wherein the detection means is a directional antenna. 20. The apparatus as claimed in claim 19, wherein the rotating means rotates the antenna by a predetermined angle according to the beam width of the antenna, and transmits information on the angle of rotation to the control means.

Images