KR20180105979A - Method and apparatus for detecting a flying object - Google Patents

Abstract

Disclosed are a method and apparatus for detecting a flying object. The disclosed method for detecting a flying object includes the steps of: receiving a downlink signal which a base station transmits; detecting a reference signal from the downlink signal; estimating channel information between the base station and a detection device based on the reference signal; and checking whether the flying object exists by comparing the estimated channel information with preset criterion information. Accordingly, the present invention can improve a flying object detection probability.

Description

METHOD AND APPARATUS FOR DETECTING A FLYING OBJECT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for detecting a flight, and more particularly, to a technique for detecting a flight using a downlink signal of a base station.

The conventional radar technology constitutes an RF transmitter which transmits a signal, and the transmitted RF or microwave signal is reflected by an object moving and senses a returning signal to measure the distance and velocity of the moving object.

That is, the RF or microwave signal to be transmitted uses a time-domain pulse or a continuous signal (CW, Continuous Wave). In the case of a radar using a pulse signal in the time domain, can do. The radar, which is composed of the same system as the transmitter and the receiver, is called an active radar and has a simple configuration and excellent ability to detect a wide radius by rotating a narrow beam. However, RF or microwave transmitters that generate high power are required, and it is difficult to identify a mobile body equipped with a stealth function, and it is easily exposed by a transmitting signal.

In addition, it is necessary to allocate an RF frequency for transmitting a signal. Due to military and commercial problems, frequency allocation is not easy, and there is a problem that it can be used only for a problem related to national security in the military.

With the development of stealth technology, the technique of avoiding the tracking of the above-mentioned type of radar has been greatly developed, and the transmission apparatus that generates high power and the antenna that radiates the narrow beam are high in the radar configuration.

The present invention provides a method and an apparatus for detecting a moving object using a downlink signal of a base station.

According to an aspect of the present invention, there is provided a method for transmitting a downlink signal, the method comprising: receiving a downlink signal transmitted from a base station; Detecting a reference signal from the downlink signal; Estimating channel information between the base station and the detection apparatus based on the reference signal; And comparing the estimated channel information with preset reference information to check whether or not the air vehicle exists.

here,

The method may further include calculating a distance between the detection device and the air vehicle using the intensity of the reference signal.

here,

The channel information may include a frequency magnitude of a signal transmitted in the corresponding channel, and a phase change magnitude.

here,

Wherein the base station includes a plurality of transmit antennas that radiate the downlink signals in different radiation patterns,

Wherein the step of detecting the reference signal comprises:

The reference signal can be detected from the downlink signals radiated by the plurality of transmit antennas.

here,

Wherein the reference signals transmitted from the plurality of transmission antennas use different antenna ports and the positions of the time-frequency resources of the reference signals are different for each antenna port,

The step of detecting the reference signal may detect the reference signals in a resource corresponding to the antenna port.

here,

The reference signal may include at least one of a cell specific reference signal (CRS) and a channel state information (CSI-RS).

here,

Wherein calculating the distance between the detection device and the air vehicle comprises:

From the cell ID information included in the CRS, the base station that has generated the reference signal, and based on the distance between the base station generating the reference signal and the detection device and the intensity of the reference signal measured by the detection device, And the distance between the vehicle and the air vehicle.

The method includes: receiving a synchronization signal from the base station; And synchronizing with the base station based on the synchronization signal.

According to another aspect of the present invention, there is provided a detection apparatus comprising: a receiver for receiving a downlink signal of a base station; A processor; And a memory for storing at least one instruction executed in the processor,

Wherein the at least one instruction comprises:

Detecting a reference signal from the downlink signal; Estimating channel information between the base station and the detection device based on the reference signal; The estimated channel information is compared with preset reference information to check whether or not the air vehicle exists.

Wherein the at least one instruction comprises:

And calculating the distance between the detection device and the air vehicle using the reception intensity of the reference signal.

here,

The channel information may include a frequency magnitude of a signal transmitted in the corresponding channel, and a phase change magnitude.

here,

Wherein the base station includes a plurality of transmit antennas that radiate the downlink signals in different radiation patterns,

Wherein the at least one instruction comprises:

And detecting the reference signal from downlink signals radiated by the plurality of transmit antennas.

here,

Wherein the reference signals transmitted from the plurality of transmission antennas use different antenna ports and the positions of the time-frequency resources of the reference signals are different for each antenna port,

Wherein the at least one instruction comprises:

And to detect the reference signals at a resource corresponding to the antenna port.

here,

The reference signal may include at least one of a cell specific reference signal (CRS) and a channel state information (CSI-RS).

here,

Wherein the at least one instruction comprises:

From the cell ID information included in the CRS, the base station that has generated the reference signal, and based on the distance between the base station generating the reference signal and the detection device and the intensity of the reference signal measured by the detection device, And the distance between the vehicle and the air vehicle.

here,

Wherein the at least one instruction comprises:

Receiving a synchronization signal from the base station; And may be performed to synchronize with the base station based on the synchronization signal.

According to another embodiment of the present invention,

A plurality of signal receiving apparatuses disposed at least one in each cell region of the base stations and receiving downlink signals transmitted from the base stations; And a processing device for processing the downlink signals received by the signal receiving devices,

The processing apparatus includes:

Detecting the reference signals included in the downlink signals received by the signal receiving apparatuses, estimating channel information between the base station and the detecting apparatus based on the reference signals, comparing the estimated channel information with preset reference information And the distance between the detection device and the air vehicle is calculated using the reception intensity of the reference signal.

here,

The processing apparatus includes:

The locus information according to the time of the air vehicle can be obtained by calculating the position of the air vehicle from the distance between each of the signal receiving devices and the air vehicle.

here,

The processing apparatus includes:

If the trajectory of the air vehicle can not be acquired in a specific time interval, the trajectory during the specific time interval can be estimated from the trajectory during the time interval before and after the specific time interval.

According to the present invention, by using the downlink signal of the base station for the detection of a flight object, it is not necessary to secure a separate frequency band for flight object detection. In addition, by using all the downlink signals of the base stations using different frequency bands, the resolution of the detection of the object can be increased. In addition, by detecting the reference signal from the downlink signals radiated from the transmission antennas having various beam radiation patterns, it is possible to increase the detection probability of the vehicle. Further, by processing the downlink signals received by the plurality of signal receiving apparatuses provided in the mobile communication cellular network, it is possible to acquire information about the trajectory of the air vehicle in a wide area.

1 is a block diagram illustrating one embodiment of a station performing methods in accordance with the present invention.
FIG. 2 is a conceptual diagram illustrating that a detection device according to an exemplary embodiment of the present invention detects a flight. FIG.
FIG. 3 is a flowchart illustrating a method of detecting a flight by the detection apparatus shown in FIG. 2;
4 is a conceptual diagram illustrating a downlink signal transmitted from an antenna of a base station.
5 is a conceptual diagram illustrating a downlink signal transmitted from a plurality of antennas when the base station includes a plurality of antennas.
6 is a conceptual diagram illustrating exemplary frequency bands used by mobile communication providers.
7 is a conceptual diagram illustrating an example of a radiation pattern of a signal radiated from a transmitting antenna of a mobile communication base station.
8 is a conceptual diagram illustrating a signal radiation pattern of transmission antennas.
9 is a conceptual diagram showing that a downlink signal reflected on a flight body reaches a signal receiver.
Fig. 10 is a conceptual diagram showing that the detection device detects a flying object.
FIG. 11 is a conceptual diagram illustrating an aircraft detection system according to an exemplary embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

Throughout the specification, the network can be, for example, a wireless Internet such as WiFi (wireless fidelity), a wireless broadband internet (WiBro) or a portable internet such as world interoperability for microwave access (WiMax) A 3G mobile communication network such as Wideband Code Division Multiple Access (WCDMA) or CDMA2000, a high speed downlink packet access (HSDPA), or a high speed uplink packet access (HSUPA) A 3.5G mobile communication network, a 4G mobile communication network such as an LTE (Long Term Evolution) network or an LTE-Advanced network, and a 5G mobile communication network.

Throughout the specification, a terminal is referred to as a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, an access terminal, , And the like, and may include all or some of functions of a terminal, a mobile station, a mobile terminal, a subscriber station, a mobile subscriber station, a user apparatus, an access terminal, and the like.

Herein, the terminal may be a desktop computer, a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone, a smart watch, smart watch, smart glass, e-book reader, portable multimedia player (PMP), portable game machine, navigation device, digital camera, digital multimedia broadcasting (DMB) player, a digital audio recorder, a digital audio player, a digital picture recorder, a digital picture player, a digital video recorder, a digital video player, And the like.

Throughout the specification, a base station is referred to as an access point, a radio access station, a node B, an evolved node B, a base transceiver station, an MMR mobile multihop relay) -BS, and may include all or some of the functions of a base station, an access point, a radio access station, a Node B, an eNodeB, a base transceiver station, and a MMR-BS.

1 is a block diagram illustrating one embodiment of a station performing methods in accordance with the present invention.

Referring to FIG. 1, a station 100 may include at least one processor 110, a memory 120, and a network interface device 130 for communicating with a network. In addition, the station 100 may further include an input interface device 140, an output interface device 150, a storage device 160, and the like. Each component included in the station 100 may be connected by a bus 170 and communicate with each other.

The processor 110 may execute a program command stored in the memory 120 and / or the storage device 160. The processor 110 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods of the present invention are performed. The memory 120 and the storage device 160 may be composed of a volatile storage medium and / or a non-volatile storage medium. For example, the memory 120 may be comprised of read only memory (ROM) and / or random access memory (RAM).

FIG. 2 is a conceptual diagram showing that the detection device 200 according to the exemplary embodiment of the present invention detects the air vehicle 20. FIG.

2, the detection apparatus 200 may include a signal receiver 210 and a processor 220 and a memory for processing signals received at the signal receiver 210 to obtain the detection information of the airplane. The memory may store at least one instruction executed in the processor 220.

The signal receiver 210 may include at least one receive antenna. The signal receiver 210 may receive a radio signal using a receive antenna. For example, the signal receiver 210 may receive the downlink signal transmitted by the base station 10.

The base station 10 may transmit a downlink signal for wireless communication between the terminals. Some of the downlink signals transmitted by the base station 10 may be transmitted to the signal receiver 210 after being reflected by the air vehicle 20. When the downlink signal is reflected to the air vehicle 20, the phase or frequency component of the downlink signal may be changed by the Doppler shift.

The processor 220 may include a processor and a memory in which instructions recorded by the processor are written. The processor 220 may receive information on the downlink signal received by the signal receiver 210 from the signal receiver 210. [ The processor 220 may process the downlink signal received by the signal receiver 210 to acquire detection information of the air vehicle 20.

FIG. 3 is a flowchart illustrating a method of detecting the air vehicle 20 by the detection device 200 shown in FIG.

In step S105, the signal receiver 210 of the detection apparatus 200 can receive a synchronization signal from the base station 10. [

In step S107, the processor 220 of the detection device 200 can synchronize with the base station 10. [ Processor 220 can synchronize with base station 10 to determine the timing at which a reference signal, as described below, is received. Then, the processor 220 can adjust the time for detecting the reference signal.

In step S110, the signal receiver 210 may receive the downlink signal. The signal receiver 210 may receive the downlink signal using one or a plurality of reception antennas. The downlink signal received by the signal receiver 210 may include a signal S1 not reflected by the air body 20 and a signal S2 reflected by the air body 20. [ The signal receiver 210 can receive the signal S1 that is not reflected by the air vehicle 20 when the air vehicle 20 does not exist in the detection range of the detection device 200. [ The signal receiver 210 detects a signal S1 that is not reflected by the air body 20 and a signal S2 that is reflected by the air body 20 when the air body 20 exists in the detection range of the detection device 200. [ Lt; / RTI >

In step 120, the processor 220 may analyze the downlink signal received by the signal receiver 210. The processor 220 may detect the reference signal in the downlink signal received by the signal receiver 210.

4 is a conceptual diagram illustrating a downlink signal transmitted from an antenna of a base station.

Referring to FIG. 4, the downlink signal may include a reference signal. The reference signal may be used for channel estimation or handover of the mobile communication terminal. For example, the reference signal may include at least one of a cell specific reference signal (CRS) and a channel state information (CSI-RS). However, the embodiment is not limited thereto.

The reference signal may occupy a predetermined position in the time-frequency domain of the downlink signal. For example, in the time-frequency domain of the downlink signal shown in FIG. 4, the reference signal can use the first and seventh frequency components in the first time slot. Also, the reference signal can use the fourth and tenth frequency components in the fifth time slot.

The processor 220 may detect the reference signal by identifying a signal at a predetermined time-frequency location in the time-frequency domain of the downlink signal received by the signal receiver 210. For example, the processor 220 may detect the signals of the first and seventh frequency components in the first time slot as reference signals. The processor 220 may not detect the reference signal in the second, third, and fourth time slots. The processor 220 may detect the signals of the fourth and tenth frequency components in the fifth time slot as reference signals.

5 is a conceptual diagram illustrating a downlink signal transmitted from a plurality of antennas when the base station includes a plurality of antennas.

Referring to FIG. 5, the base station may include a plurality of antennas. The signal receiver 210 may also include a plurality of receive antennas. In this case, the transmission and reception of the downlink signal may be performed by a Multiple Input Multiple Output (MIMO) scheme.

Each of the downlink signals transmitted at different antennas may include reference signals of different time-domain positions. For example, the reference signal of the downlink signal transmitted by the 0th antenna may use the first and seventh frequency components in the first time slot. In addition, the reference signal of the downlink signal transmitted by the 0th antenna can use the 4th and 10th frequency components in the 5th time slot. On the other hand, the reference signal of the downlink signal transmitted by the first antenna can use the fourth and tenth frequency components in the first time slot. The reference signal of the downlink signal transmitted by the first antenna may use the first and seventh frequency components in the fifth time slot.

Processor 220 may detect reference signals in different frequency ranges at the same time. For example, the processor 220 may detect the signals of the first, fourth, seventh, and tenth frequency components in the first time slot as reference signals. Also, the processor 220 can detect the first, fourth, seventh, and tenth frequency component signals as reference signals in the fifth time slot. The processor 220 can utilize all of the reference signals transmitted from the plurality of transmit antennas, thereby improving the signal-to-noise ratio in flight detection.

The reference signals transmitted from the plurality of transmission antennas included in the base station 10 may use different antenna ports. For example, the reference signal transmitted from the antenna # 0 uses the antenna port # 0, and the reference signal transmitted from the antenna port # 1 can use the antenna port # 1.

When the processor 220 detects the reference signal, it may detect the reference signals in the time-frequency resource corresponding to the antenna port. For example, if the signal receiver 210 receives reference signals from antenna 0 and antenna 1, the processor 220 can identify the antenna port numbers from the reference signals received by the signal receiver 210 . The processor 220 may then check the reference signals at a frequency-time location corresponding to the corresponding antenna port numbers. For example, if the processor 220 identifies the 0 and 1 antenna ports in the reference signals, the processor 220 may determine that the antenna ports are 1, 4, 7, and 11 in the 1, 4, 7, It is possible to detect signals having time-frequency resources of the 11 < th > frequency component as reference signals.

The processor 220 may detect a reference signal from downlink signals of base stations using different frequency resources.

6 is a conceptual diagram illustrating exemplary frequency bands used by mobile communication providers.

Referring to FIG. 6, Company A uses a total 35 MHz frequency band near 800 MHz, 900 MHz and 1.8 GHz, Company B uses a total 35 MHz frequency band near 800 MHz and 1.8 GHz, and Company C uses 800 MHz A total of 40MHz frequency bands can be used near the band, the 2.1GHz band, and the 2.6GHz band.

The signal receiver 210 can receive all the downlink signals of Company A, Company B, and Company C. Then, the processor 220 can detect the reference signal from the downlink signals of Company A, Company B, and Company C. By using all the frequency bands of the downlink signals of the mobile communication companies for the detection of the object, the detection resolution of the object can be increased.

7 is a conceptual diagram showing an example of a radiation pattern of a signal radiated from a transmitting antenna of the mobile communication base station 10. As shown in FIG.

Referring to FIG. 7, the intensity of the signal radiated from the transmission antenna may vary according to the radiation angle. For example, the intensity of the signal radiated in the direction D1 is relatively strong, while the intensity of the signal radiated in the direction D2 may be relatively weak. Therefore, when the flying object 20 exists in the direction D1 from the transmitting antenna of the base station 10, the detection probability of the flying object 20 is high. However, if the flying object 20 exists in the direction D2 from the transmitting antenna of the base station 10, The detection probability of the flying object 20 can be lowered.

The base station 10 may include transmit antennas that radiate downlink signals in different radiation patterns.

8 is a conceptual diagram illustrating a signal radiation pattern of transmission antennas.

Referring to FIG. 8, the signal emission patterns of the transmission antenna for radiating the 900 MHz band signal and the transmission antenna for radiating the 1800 MHz band signal may be different from each other. If all the downlink signals transmitted from the transmission antennas having different signal radiation patterns are used for the detection of the object, it is possible to reduce the area where the detection probability of the object 20 decreases. The processor 220 may detect the reference signal from the downlink signals that are radiated by the transmit antennas of the base station 10 with different signal radiation patterns. Through this, the probability of detection of a flying object can be higher.

Referring again to FIG. 3, in step S130, the processor 220 may estimate a channel between the base station 10 and the detection apparatus 200 based on the reference signal received by the signal receiver 210. FIG. The channel information may include information on a frequency magnitude and a phase magnitude of a signal transmitted from the corresponding channel. The processor 220 may estimate the channel between the base station 10 and the detection apparatus 200 so that the downlink signal is reflected by the air vehicle 20 to check whether the frequency component or the phase of the downlink signal has changed .

In step S140, the processor 220 can check whether the air vehicle 20 exists by comparing the estimated channel information with predetermined reference information. The preset reference information may include information on the reference signal to be measured when the air vehicle 20 does not exist. The preset reference information may include information on a reference signal generated in the base station 10. [ The processor 220 may determine whether the downlink signal is reflected by the air vehicle 20 from the difference between the reference signal received from the signal receiver 210 and the reference information.

For example, the processor 220 can check whether there is a Doppler shift between a reference signal generated from the base station 10 and a reference signal received from the signal receiver 210. If there is no Doppler shift, the processor 220 may determine that the flying object 20 is not detected. When a signal component having a Doppler shift is identified, the processor 220 can determine that the flying object 20 has been detected.

The processor 220 may calculate the distance between the detection device 200 and the air vehicle 20 from the intensity of the reference signal measured at the signal receiver 210 in step S150.

9 is a conceptual diagram showing that the downlink signal reflected on the air vehicle 20 reaches the signal receiver 210. In FIG.

9, the downlink signal transmitted from the base station 10 may be reflected from the air vehicle 20, and then reach the signal receiver 210 of the detection apparatus 200. Referring to FIG. The traveling distance of the downlink signal may be equal to the sum of the distance R1 between the base station 10 and the air vehicle 20 and the distance R2 between the air vehicle 20 and the signal receiver 210. [ The intensity of the reference signal measured by the signal receiver 210 may be reduced as the distance of the downlink signal increases. The relationship between the intensity of the reference signal measured in the signal receiver 210 and the traveling distance of the downlink signal can be expressed by Equation (1).

The equation C (R1 + R2) means a function depending on R1 + R2, and X ( _RS ) means a signal at the frequency component _RS of the reference signal. That is, the right side of Equation (1) may be equal to the sum of the strengths of the received reference signals.

The reference signal may include a CRS. The processor 220 may identify the cell ID of the base station 10 that transmitted the reference signal from the CRS. The processor 220 can know the location of the base station 10 from the cell ID of the base station 10. [ The processor 220 may then determine the distance L between the base station 10 and the signal receiver 210.

The processor 220 can calculate the traveling distance R1 + R2 of the downlink signal from the intensity of the reference signal shown in the right side of Equation (1). The processor 220 calculates the distance between the base station 10 and the signal receiver 210 from the angle of incidence of the downlink signal to the signal receiver 210 and the distance L between the base station 10 and the signal receiver 210, The distance R1 between the air vehicle 20 and the signal receiver 210 can be calculated. The processor 220 can estimate the position of the air vehicle 20 by knowing the distance R1 between the air vehicle 20 and the signal receiver 210. [

10 is a conceptual diagram showing that the detection device 200 detects the air vehicle 20.

Referring to FIG. 10, the detection apparatus 200 may be located in the cell region C1 of the first base station 10a. The detection apparatus 200 detects not only the downlink signals of the first base station 10a but also the downlink signals of the second base station 10b and the third base station 10c adjacent to the first base station 10a Can be used. For example, the signal receiver 210 receives both the downlink signals of the first base station 10a, the second base station 10b and the third base station 10c, and the processor 220 receives the downlink signals of the first base station 10a ), The second base station 10b, and the third base station 10c to detect the air vehicle 20 by detecting the reference signal. The signal-to-noise ratio can be increased by using all the downlink signals of the adjacent base stations 10a, 10b, and 10c for the detection of the object.

FIG. 11 is a conceptual diagram illustrating an aircraft detection system according to an exemplary embodiment of the present invention.

Referring to FIG. 11, the airborne object detection system detects the cell regions C1, C2, C3, C4, C5, C6, C7, and C7 of the base stations 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 312, 313, 314, 315, 316, 317, 318, 319 and signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318, and 319. The processing unit 320 processes the downlink signals.

The signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318 and 319 are arranged such that each of the signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318, And receive the downlink signals reflected from the flying object 20 in the cell region adjacent to each of the cell regions or the signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318 and 319.

The processing device 320 may receive information about the measurement results of the downlink signal from the signal receiving devices 311, 312, 313, 314, 315, 316, 317, 318, and 319 by wire or wireless communication have. The processing apparatus 320 may detect the reference signals in the downlink signals received by the signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318 and 319. The processing device 320 compares reference signals received by the signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318, and 319 with reference signals stored in advance to determine whether a Doppler shift has occurred It can be judged. The processing device 320 can confirm whether or not a flying object exists based on whether a Doppler shift has occurred.

Once the presence of the air vehicle is identified, the processing device 320 determines the strength of the reference signals measured at the signal receiving devices 311, 312, 313, 314, 315, 316, 317, 318, 313, 314, 315, 316, 317, 318, and 319 and the flight body 20 can be calculated to determine the position of the flight body 20. In this case, the measurement results of the plurality of signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318, and 319 are reflected so that the position calculation of the air vehicle 20 can be more accurate.

The signal receiving apparatuses 311, 312, 313, 314, 315, 316, 317, 318 and 319 are arranged at least one for each of the cell regions C1, C2, C3, C4, C5, C6, C7, The processing device 320 can continuously detect a change in the position of the air vehicle 20 with respect to time. Accordingly, the processing apparatus 320 can obtain the locus information according to the time of the air vehicle 20, as shown in FIG.

The processing device 320 can estimate the trajectory of the flying object 20 from the trajectory before and after the time interval during which the flying object 20 is not detected. For example, while the air vehicle 20 passes through the cell area C9 of the ninth base station 10i, the position of the air vehicle 20 may not be detected. In this case, the processing device 320 determines the trajectory of the air vehicle 20 obtained while the air vehicle 20 passes through the cell region C6 of the sixth base station 10f and the trajectory of the air vehicle 20 acquired by the eighth base station 10h. It is possible to estimate the locus during the time period during which the air vehicle 20 is not detected by using the trajectory of the air vehicle 20 obtained while passing through the cell region C6 of the vehicle.

The embodiments of the present invention have been described above with reference to Figs. 1 to 11. Fig. According to the above-described embodiments, by using the downlink signal of the base station 10 for the detection of a flight, it is not necessary to secure a separate frequency band for flight detection. In addition, by using all the downlink signals of the base stations using different frequency bands, the resolution of the detection of the object can be increased. In addition, by detecting the reference signal from the downlink signals radiated from the transmission antennas having various beam radiation patterns, it is possible to increase the detection probability of the vehicle. In addition, information on the trajectory of the air vehicle 20 can be obtained in a wide area by processing the downlink signals received from the plurality of signal receiving devices provided in the mobile communication cellular network.

The methods according to the present invention can be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention or may be available to those skilled in the computer software.

Examples of computer readable media include hardware devices that are specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by the compiler 1, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (19)

A method of detecting a moving object performed on a detection device,
Receiving a downlink signal transmitted by a base station;
Detecting a reference signal from the downlink signal;
Estimating channel information between the base station and the detection apparatus based on the reference signal; And
And comparing the estimated channel information with preset reference information to check whether or not the air vehicle exists. The method according to claim 1,
And calculating a distance between the detection device and the air vehicle using the reception intensity of the reference signal. The method according to claim 1,
Wherein the channel information includes a frequency magnitude of a signal transmitted in the corresponding channel, and a phase change magnitude. The method according to claim 1,
Wherein the base station includes a plurality of transmit antennas that radiate the downlink signals in different radiation patterns,
Wherein the step of detecting the reference signal comprises:
And detecting the reference signal from downlink signals radiated by the plurality of transmit antennas. The method of claim 4,
Wherein the reference signals transmitted from the plurality of transmission antennas use different antenna ports and the positions of the time-frequency resources of the reference signals are different for each antenna port,
Wherein detecting the reference signal comprises detecting the reference signals at a resource corresponding to the antenna port. The method according to claim 1,
Wherein the reference signal includes at least one of a cell specific reference signal (CRS) and a channel state information (CSI-RS). The method of claim 6,
Wherein calculating the distance between the detection device and the air vehicle comprises:
From the cell ID information included in the CRS, the base station that has generated the reference signal, and based on the distance between the base station generating the reference signal and the detection device and the intensity of the reference signal measured by the detection device, And calculating a distance between the object and the object. The method according to claim 1,
Receiving a synchronization signal from the base station; And
And synchronizing with the base station based on the synchronization signal. As a detection device,
A receiver for receiving a downlink signal of a base station;
A processor; And
And a memory for storing at least one instruction executed in the processor,
Wherein the at least one instruction comprises:
Detecting a reference signal from the downlink signal; Estimating channel information between the base station and the detection device based on the reference signal; And comparing the estimated channel information with preset reference information to check whether or not the air vehicle exists. The method of claim 9,
Wherein the at least one instruction comprises:
And using the reception intensity of the reference signal to calculate a distance between the detection device and the air vehicle. The method of claim 9,
Wherein the channel information includes a frequency magnitude of a signal transmitted in the corresponding channel, and a phase change magnitude. The method of claim 9,
Wherein the base station includes a plurality of transmit antennas that radiate the downlink signals in different radiation patterns,
Wherein the at least one instruction comprises:
And detecting the reference signal from downlink signals radiated by the plurality of transmit antennas. The method of claim 12,
Wherein the reference signals transmitted from the plurality of transmission antennas use different antenna ports and the positions of the time-frequency resources of the reference signals are different for each antenna port,
Wherein the at least one instruction comprises:
And to detect the reference signals at a resource corresponding to the antenna port. The method of claim 9,
Wherein the reference signal includes at least one of a cell specific reference signal (CRS) and a channel state information (CSI-RS). 15. The method of claim 14,
Wherein the at least one instruction comprises:
From the cell ID information included in the CRS, the base station that has generated the reference signal, and based on the distance between the base station generating the reference signal and the detection device and the intensity of the reference signal measured by the detection device, And calculating the distance between the aircraft and the aircraft. The method of claim 9,
Wherein the at least one instruction comprises:
Receiving a synchronization signal from the base station; And to synchronize with the base station based on the synchronization signal. A plurality of signal receiving apparatuses disposed at least one in each cell region of the base stations and receiving downlink signals transmitted from the base stations;
And a processing device for processing the downlink signals received by the signal receiving devices,
The processing apparatus includes:
Detecting the reference signals included in the downlink signals received by the signal receiving apparatuses, estimating channel information between the base station and the detecting apparatus based on the reference signals, comparing the estimated channel information with preset reference information Thereby detecting the presence of a flying object and calculating a distance between the detection device and the flying object using the intensity of the reference signal. 14. The method of claim 13,
The processing apparatus includes:
And acquiring sign information according to time of the airplane by calculating the position of the airplane from the distance between each of the signal receiving devices and the airplane. 15. The method of claim 14,
The processing apparatus includes:
Wherein the trajectory estimation unit estimates a trajectory during the specific time period from a trajectory during a time period before and after the specific time period when the trajectory of the air vehicle can not be acquired in a specific time period.

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