KR20210078740A - Multi channel hybrid storage in unmanned aerial vehicle - Google Patents

Abstract

The present invention relates to a multi-channel hybrid storage device of an unmanned aerial vehicle direction detection system comprising: an HDD that stores a main signal among a multi-channel reception signal; and an SSD that stores a phase signal among the multi-channel reception signal. Therefore, the present invention is capable of having an effect of improving a speed of data storage.

Description

Multi-channel hybrid storage device of UAV direction finding system {MULTI CHANNEL HYBRID STORAGE IN UNMANNED AERIAL VEHICLE}

The present invention relates to a multi-channel hybrid storage device for a direction finding system for an unmanned aerial vehicle, and more particularly, to a multi-channel hybrid storage device for storing a main signal and a phase signal separately from a received signal.

An unmanned aerial vehicle (UAV) is an aircraft that has the ability to perform operations by inducing radio waves without a pilot. Such unmanned aerial vehicles have been conventionally used as targets for weapon system testing or training, but now their use has expanded and is being used for various purposes such as reconnaissance, observation, surveillance, and deception. These UAVs can be recovered and reused, and there is no human loss due to battle or aircraft crash because there is no need for a pilot on board, and there is no restriction on the physiology or psychological state of the pilot on board. In particular, an unmanned aerial vehicle that performs a mission by radio control can be remotely controlled by displaying flight information transmitted from a non-visible range on the instrument or screen of the cockpit located on the ground. Therefore, the electronic equipment of the aircraft essentially includes the radio equipment that connects the aircraft and the cockpit on the ground, the electronic equipment necessary to measure and control the flight status, and the mission equipment necessary for the mission.

Among them, an unmanned reconnaissance aircraft is an aircraft that can perform reconnaissance missions without a person on board. When measuring the reconnaissance area on the ground, a shadow zone occurs due to topographical features, and there are disadvantages of severe interference from the reflected wave from the ground. A quick update is possible.

To this end, the unmanned reconnaissance aircraft is equipped with high-performance optics, infrared reconnaissance equipment, radar, and various electronic equipment to perform precise electronic information collection and terrain reconnaissance. For example, the unmanned reconnaissance aircraft may be equipped with a wideband small digital signal receiving system mounted on an unmanned aerial vehicle with a multi-channel storage function, which collects and stores electromagnetic wave signals in the communication information band, and demodulates and analyzes the collected data to create a DB It is a system that makes Such a signal receiving system may include an antenna assembly, a signal collecting device, a signal distribution module, an RF receiving module, a digital signal processing module, a power supply module, and the like.

In order to maximize the efficiency of the UAV signal receiving system, compactness and weight reduction are required, and in consideration of the characteristics of various and complex communication information bands, it must have a simultaneous storage function of 4 or more channels. However, when simultaneously storing signals of 4 or more channels, storing all the data collected from a plurality of antennas for the same signal has a problem in that the storage capacity is severely wasted.

For example, a direction detection system of an unmanned aerial vehicle receives the same signal using a plurality of antennas, and detects the direction of a target signal by calculating a phase difference between the received signals. For this analysis, data received from several multi-channel antennas is stored. At this time, the data received from each antenna for analysis is in a state in which the same data has only a time delay, and other signal characteristics are the same. When all of these are stored for each channel, similar data is duplicated and stored as many as the number of channels required for direction detection. When each similar signal is stored in this way, it is undesirable to store a large amount of data due to a problem of storage capacity.

In order to solve such a large amount of signal data generation in a short period of time, as shown in FIG. 1 , multiple hard disks with a large capacity are bundled and configured in a redundant configuration to provide similar performance to the existing expensive, large-capacity, high-performance disks. method was devised. From then on, a disk array system that uses a method of arranging multiple disks, dividing files into blocks, and storing them on each disk has emerged.

However, this RAID (Redundant Array of Independent Disks) configuration is not suitable for storing multi-channel data for direction finding. This is because when using RAID, data output from each antenna is stored in parallel on the disk or by increasing the storage speed, so there is a problem in processing speed and a limitation in storage capacity.

Such an existing RAID structure is not efficient in storing channel data for direction finding due to problems such as processing speed and redundant data storage, and a new data storage structure suitable for direction finding signals is needed to improve this.

Korean Patent Publication No. 10-2012-0026410

An object of the present invention is to provide a multi-channel hybrid storage device for a direction finding system for an unmanned aerial vehicle that separates and stores a main signal and a phase signal by using the overlapping characteristics of the signal in storing the direction finding signal.

A first aspect of the present invention for achieving the above object is, in a multi-channel hybrid storage device of an unmanned aerial vehicle direction finding system, an HDD storing a main signal among multi-channel reception signals, and storing a phase signal among multi-channel reception signals. and a flash memory faster than the HDD.

Preferably, the HDD is connected to an antenna for receiving a main signal, and the flash memory is connected to at least one antenna for receiving a phase signal.

Preferably, the HDD stores the main signal continuously for all time intervals in the main signal storage mode, and the flash memory stores the phase signals discretely for a predetermined time interval in the phase signal storage mode.

Preferably, after aligning signals received through multiple channels at the same time using a time stamp that is reference time information, the main signal, the phase signal, and the time information are stored together.

Preferably, the phase comparator extracts the corresponding phase and the direction of the incident signal through comparison between the received signals.

Preferably, the flash memory is an SSD.

As described above, according to the present invention, the main signal is stored in a large-capacity HDD, and the data of the channel antenna for phase measurement is acquired for a certain period of time and stored in the high-speed SSD, thereby improving the data storage speed and reducing the storage capacity through storage data. has an augmentation effect.

1 is a conceptual diagram for explaining an exemplary configuration of a conventional multi-channel storage device for direction finding.
2 is a conceptual diagram for explaining the characteristics of data for each channel received by the UAV direction finding system.
3 is a conceptual diagram for explaining a multi-channel hybrid storage device of an unmanned aerial vehicle direction detection system according to a preferred embodiment of the present invention.
4 is a conceptual diagram for explaining a direction measurement method using a phase in an unmanned aerial vehicle direction detection system.
5 is a graph for explaining a method of storing a main channel signal and a phase signal channel using a time stamp in a multi-channel hybrid storage device of an unmanned aerial vehicle direction finding system.

Hereinafter, the advantages and features of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout. “and/or” includes each and every combination of one or more of the recited items.

It should be understood that although first, second, etc. are used to describe various elements, components, and/or sections, these elements, components, and/or sections are not limited by these terms. These terms are only used to distinguish one element, component, or sections from another. Accordingly, it goes without saying that the first element, the first element, or the first section mentioned below may be the second element, the second element, or the second section within the spirit of the present invention.

In addition, identification symbols (eg, a, b, c, etc.) in each step are used for convenience of description, and identification symbols do not describe the order of each step, and each step is clearly specified in context. Unless the order is specified, the order may differ from the specified order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” refers to the presence of one or more other components, steps, operations and/or elements mentioned. or addition is not excluded.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In addition, in the description of the embodiments of the present invention, if it is determined that a detailed description of a well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

2 is a conceptual diagram for explaining characteristics of data for each channel received by the UAV direction finding system. A direction finding system receives data from a signal source and detects a direction using a phase difference between the received signals. In this case, as shown in FIG. 2 , signal characteristics between signals received from each antenna, such as ANT1 to ANT4, are the same, but only the phase delay is different.

By using the received signal characteristics of the direction finding system, it is not necessary to store signals of all channels when storing signals for direction finding. That is, the main channel signal may be continuously stored, but the remaining phase signals may be stored at regular time intervals. In this way, it is possible to secure all the signals for direction finding along with signal analysis and increase the storage capacity.

Using these characteristics, the HDD is used for storing large-capacity continuous data for the main channel, and operations such as multi-channel processing and merging and error verification and restoration are performed. , you can use an SSD, for example. When using such a multi-channel hybrid storage device by SSD and HDD, the main data is stored in the HDD, and only the phase information of the redundant data is merged to use the high-speed SSD, so it is possible to remove the bottleneck during storage and increase the storage capacity. have.

3 is a conceptual diagram for explaining a multi-channel hybrid storage device of an unmanned aerial vehicle direction detection system according to a preferred embodiment of the present invention.

Referring to FIG. 3 , the multi-channel hybrid storage device of the UAV direction finding system according to a preferred embodiment of the present invention includes an HDD connected to an antenna ANT1 for receiving a main signal, and antennas ANT2 to ANT4 for receiving a phase signal. It consists of an SSD connected to Here, the HDD is a low-speed storage device that stores data by rotating a magnetic disk, and may include an embedded modular type. In addition, the SSD may include an embedded modular type as a SATA-type high-speed flash disk.

At this time, the multi-channel hybrid storage device operates by being divided into a “main signal storage mode” for storing the main signal and a “phase signal storage mode” for storing the phase information of the signal indicating each direction. That is, the multi-channel hybrid storage device does not store the generated signal on the same disk, but stores the signal that is continuous and large-capacity in the “main signal storage mode” in the HDD 100, and stores it in the “phase signal storage mode” at high speed. The phase signal requiring frequent input/output is stored in the SSD 200 . For example, the main signal received from ANT1 may be stored in the HDD 100 , and phase signals received from ANT2 to ANT4 may be stored in the SSD 200 .

The reason for the separate storage is that the frequency of reading and saving data blocks storing phase information occurs frequently due to the characteristics of the direction finding channel. In order to compensate for the high bottleneck of reading and writing phase data due to this, a hybrid storage device in which one HDD for main channel data storage and a high-speed SSD for phase information storage are combined is constituted.

This will be described in more detail with reference to FIGS. 4 and 5 .

4 illustrates a direction measuring method using a phase in an unmanned aerial vehicle direction finding system.

As shown in FIG. 4 , in order to detect a direction using a phase, two well-matched antennas (Ant.1, Ant.2) and a phase comparator are used. The signals received by the two antennas are transmitted to the phase comparator 300, where the relative phase difference according to the incident direction is measured.

는 식 (1)과 같이 구할 수 있다. A line connecting the centers of the two antennas is called a baseline, the length of the reference line is D, the direction of incidence of radio waves is θ, and the wavelength of the incident signal is λ.

can be obtained as in Equation (1).

Formula (1)

Then, the azimuth angle of the incoming signal can be obtained using Equation (2) as follows.

Equation (2)

5 is a graph for explaining a method of storing a main channel signal and a phase signal channel using a time stamp in a multi-channel hybrid storage device of an unmanned aerial vehicle direction finding system.

The timestamp is information that displays the time at regular time intervals using the high-speed clock inside the system. Using this as the reference time, the phase is measured at the same time. That is, incident signals coming through multiple channels are aligned at the same time using “Time Stamp”, which is the reference time information. This is because, in the present invention, since data is not always stored in the multi-channel reception signal corresponding to direction information in order to efficiently store data, a time stamp, which is reference time information, is used to calculate the direction at the same time.

In the multi-channel hybrid storage device of the UAV direction finding system according to the present invention, data received from an antenna and time information generated from an internal clock are stored together. That is, signals received from multiple channels are stored based on the same time. When the stored data is restored, since data having the same time stamp are signals received at the same time, the corresponding phase and the direction of the incident signal are measured through comparison between the signals.

At this time, as shown in FIG. 5, main signal data such as channel 1 is continuously stored in the HDD for all time intervals, but phase signals such as channels 2 to 4 are not always stored but stored in one SSD at regular time intervals. Save. For example, on the basis of the main channel, both the main signal and the phase signal are stored in T1 to T4, but the phase signal is not stored in T5 to T8, but only the main signal is stored. This is called the signal storage time interval (Packet Store Time) and is stored at discrete intervals as P1, P2, and P3.

Here, the time stamp is information indicating a regular interval and sequence of stored time. The corresponding time stamp is used when calculating the phase information as a reference time for synchronizing in a signal that is intermittently stored in packet units. Using this reference time information, each of the stored multi-channel signals is compared, phase difference information is extracted, and a direction is calculated. In addition, after restoring data stored in units of periods, it is possible to restore data for all times using interpolation.

Although a preferred embodiment of the method and system for positioning according to the present invention has been described above, the present invention is not limited thereto, and various modifications are made within the scope of the claims, the detailed description of the invention, and the accompanying drawings. possible and also belong to the present invention.

100: HDD
200: SSD
300: phase comparator

Claims (6)

In the multi-channel hybrid storage device of the UAV direction detection system,
HDD for storing main signals among multi-channel reception signals; and
A hybrid storage device comprising a flash memory faster than the HDD for storing a phase signal among multi-channel reception signals.
According to claim 1,
The HDD is connected to an antenna for receiving the main signal,
The flash memory is a hybrid storage device, characterized in that connected to at least one antenna for receiving the phase signal.
According to claim 1,
The HDD continuously stores the main signal for all time intervals in the main signal storage mode,
The flash memory is a hybrid storage device, characterized in that it stores the phase signal discretely for a predetermined time interval in the phase signal storage mode.
4. The method of claim 3,
A hybrid storage device, characterized in that after aligning signals received through multiple channels to the same time using a time stamp that is reference time information, the main signal, the phase signal, and time information are stored together.
5. The method of claim 4,
A hybrid storage device, characterized in that the phase comparator extracts the corresponding phase and the direction of the incident signal through comparison between the received signals.
According to claim 1,
The flash memory is a hybrid storage device, characterized in that the SSD.

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