KR102413977B1 - Signal receiver system for unmanned aerial vehicle with automatic gain controller according to the deterioration of time and temperature characteristics using built-in-test functions - Google Patents

Abstract

The present invention relates to an automatic gain adjustment device for a wideband signal receiving system for an unmanned aerial vehicle, and a variable attenuator located in a signal collecting device during the construction of a signal receiving system for an unmanned aerial vehicle and adjusting a gain by receiving a wideband signal, and the variable attenuator and a controller that provides a control signal for adjusting a gain of an input signal to the variable attenuator.

Description

A signal receiver for an unmanned aerial vehicle that can automatically adjust gain for gain characteristics degradation according to time and temperature characteristics in a wideband signal receiver with self-inspection function {SIGNAL RECEIVER SYSTEM FOR UNMANNED AERIAL VEHICLE WITH AUTOMATIC GAIN CONTROLLER ACCORDING TO THE DETERIORATION OF TIME AND TEMPERATURE CHARACTERISTICS USING BUILT-IN-TEST FUNCTIONS}

The present invention relates to an apparatus for automatic gain adjustment of an unmanned aerial vehicle broadband signal reception system, and more specifically, gain adjustment for automatically compensating for deterioration of signal characteristics due to time and temperature change by checking a self-inspection function for a signal received in a wideband It relates to a signal receiver for an unmanned aerial vehicle having a device.

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 were conventionally used as targets for weapon system testing or training, but now their uses have expanded and are 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, drones that perform missions by radio control can be remotely controlled by displaying flight information transmitted from non-visible distances on the instrument or screen of the cockpit located on the ground. Therefore, the electronic equipment of the aircraft necessarily 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 is a disadvantage 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, an 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 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.

The unmanned aerial vehicle signal receiving system has a very wide radio wave reception band, and must have a self-checking function for gain characteristics according to time and temperature. Accordingly, there has been a need for a device capable of automatically adjusting the deterioration of gain characteristics according to frequency band, time, and temperature characteristics in the UAV wideband signal receiving system.

Korean Patent Publication No. 10-2016-0033508

It is an object of the present invention to provide an automatic gain adjustment apparatus capable of automatically adjusting the deterioration of gain characteristics according to frequency band, time, and temperature characteristics in an unmanned aerial vehicle wideband signal reception system.

In order to achieve the above object, a first aspect of the present invention provides an automatic gain adjustment apparatus for a wideband signal receiving system for an unmanned aerial vehicle, a variable attenuator for receiving a wideband signal and adjusting a gain, and a gain of a signal input to the variable attenuator and a controller providing a control signal for adjustment to the variable attenuator.

Preferably, the controller includes a frequency band compensator, wherein the frequency band compensator provides a compensation control signal having a large loss in a low frequency band and a small loss in a high frequency band to the variable attenuator.

Preferably, the controller includes a temperature compensator, and according to a temperature compensation table in which correction values for each temperature are stored, a correction value for the current temperature of the signal receiving system is provided to the variable attenuator.

Preferably, the controller comprises a time compensator.

Preferably, a plurality of variable attenuators may be connected in series.

As described above, according to the present invention, in the UAV wideband signal receiving system, there is an effect of optimizing the loss by automatically adjusting the deterioration of the gain characteristics according to the frequency band, time and temperature characteristics.

1 is a block diagram for explaining an automatic gain adjustment apparatus of an unmanned aerial vehicle wideband signal reception system according to a preferred embodiment of the present invention.
2 is a graph illustrating an example of applying a gain compensation value for each frequency band.
3 is an operational conceptual diagram of a system in which an antenna set and a signal collecting device are mounted on an aircraft or an unmanned aerial vehicle.
4 is a configuration example of a signal receiving system for an unmanned aerial vehicle having an automatic gain adjustment function.
5 is an example of the shape of the front end signal distribution plate in the signal collecting device.
6 is a flowchart of an apparatus for automatically adjusting gain by checking a correction table and real-time information possessed by temperature/frequency in a signal receiver for an unmanned aerial vehicle.

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. In this specification, 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.

1 is a block diagram for explaining an automatic gain adjustment apparatus of an unmanned aerial vehicle wideband signal reception system according to a preferred embodiment of the present invention.

Referring to FIG. 1 , the automatic gain adjustment apparatus of the UAV wideband signal receiving system according to a preferred embodiment of the present invention includes an amplifier 100 , a variable attenuator 200 , and a controller 300 . Specifically, the signal received in the UAV wideband signal receiving system is a wideband in the range of 20 MHz to 10 GHz, and this signal is first input to the amplifier 100 . In the amplifier 100, the received signal is amplified in a certain range. The amplified signal is input to the variable attenuator 200 . The variable attenuator 200 receives a control signal from the controller 300 and adjusts a gain, and outputs a gain-adjusted signal.

In an unmanned aerial vehicle, a large amount of loss occurs by temperature, distance, and signal strength when collecting signals in free space. A variable attenuator is provided to optimize this loss and to minimize performance degradation with temperature and time.

The variable attenuator 200 receives a control signal for automatic gain adjustment from the controller 300 . The controller 300 may include a frequency band compensator 310 , a time compensator 320 , and a temperature compensator 330 . According to an embodiment, a plurality of variable attenuators may be connected in series according to the type of compensation.

Hereinafter, each compensation performed by the controller 300 will be described in more detail.

First, the reason that frequency band compensation is necessary is that, in the case of a wideband signal receiving system of 20 MHz to 7.5 GHz, the gain is lowered at a high frequency compared to a low frequency, so that the gain flatness characteristic in the entire band is deteriorated. The receiver gain graph in (a) of FIG. 2 shows this. Therefore, as shown in (b) of FIG. 2, if a gain equalizer having a large loss in a low frequency band and a small loss in a high frequency band is used, the reception gain characteristics can be supplemented. That is, the compensation result to which the gain equalizer is applied can obtain a result in which the gain is compensated as shown in (c) of FIG. 2 . Accordingly, the frequency band compensator of the controller of FIG. 1 may be implemented by the gain equalizer of FIG. 2 .

Next, a method of improving the gain for the problem of performance degradation with temperature and time will be described.

The UAV's broadband signal reception system has a change in gain as performance deteriorates according to temperature and time. Therefore, it is possible to check in real time whether the performance of the UAV wideband signal receiving system has changed, and if there is a change in the performance, the performance can be supplemented according to the adjustment value of the time compensator 320 or the temperature compensator 330 of the controller 300 . can

For example, unmanned aerial vehicles (UAVs) have high altitude and temperature fluctuations during flight. The gain value changed from the temperature change amount can be measured in advance in a temperature chamber, and a correction value for each temperature can be calculated and stored as a temperature compensation table. The calculated value measures the current temperature while monitoring the internal temperature sensor of the unmanned aerial vehicle through the temperature sensor mounted inside the controller of the signal collection device, and the temperature compensation unit 330 of the controller 300 compensates for the corresponding temperature value. is applied and transmitted to the variable attenuator.

Preferably, the output intensity is corrected while the temperature test is performed on the basis of 1 degree in the range of -40 to +85 degrees using a temperature chamber, and this table is stored in the memory. As shown in the table below, a table can be prepared with a frequency of 20 MHz to 8 GHz, a signal attenuation range of 0 dB to -60 dB, and a resolution of 0.5 dB.

<Compensation table for each frequency>

Preferably, by using a temperature chamber to measure in the range of -40 to +85 degrees and compare the values stored in the memory based on the stored temperature and time compensation tables for each frequency, the degree of attenuation of the variable attenuator is automatically adjusted according to the compensation table in real time. Adjust.

In addition, the controller 300 may include a time compensator 320 to compensate for a gain over time.

3 is an operational concept of a system equipped with an antenna set and a signal collecting device in an aircraft or unmanned aerial vehicle, and collects and stores a wideband communication information signal of 20 MHz to 8 GHz. The analysis test apparatus performs spectrum analysis of the stored collected signal, signal demodulation, and databaseization of the collected information. In addition, it implements the function of precisely collecting the band signal according to the operator's choice.

Referring to FIG. 3 , it is a system that first collects signals while moving an unmanned aerial vehicle, collects and stores communication information signals, and builds a database through a signal precision analysis process. In addition, in order to solve the spatial constraint, it is developed to be compact and lightweight so that it can be mounted on an unmanned aerial vehicle, and a verification system that can test and confirm the performance of the developed system is developed. As the radio wave usage environment becomes high-frequency and broadband and new radio communication services such as 5G, Internet of Things communication, and unmanned aerial vehicles appear, the direction detection function for collecting/analyzing communication information and locating and tracing the location of the analyzed signal has been applied to civil and military affairs. It is the direction of development of the field.

4 shows the configuration of a signal receiving system for an unmanned aerial vehicle having an automatic gain adjustment function, and is composed of an antenna set, a signal collection device, and an analysis test device, and the automatic gain adjustment device is located in the signal collection device.

Figure 5 is the shape of the front end signal distribution board in the signal collecting device, the signal (20 MHz ~ 7.5 GHz) input from the antenna used in the signal collecting device using the front end signal distribution board to distribute the signal to the IF conversion plate. do.

6 is a flowchart of an apparatus for automatically adjusting gain by checking a correction table and real-time information possessed by temperature/frequency in a signal receiver for an unmanned aerial vehicle.

Although preferred embodiments of the method and system for positioning according to the present invention have 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: amplifier
200: variable attenuator
300: controller
400: front end signal distribution board
500: signal collecting device
600: signal receiving system for unmanned aerial vehicle
700: Unmanned aerial vehicle signal receiving system operation concept

Claims (5)

In the automatic gain adjustment device of the UAV wideband signal receiving system,
a variable attenuator for receiving a wideband reception signal and adjusting a gain; and
a controller for providing a control signal for adjusting a gain of a signal input to the variable attenuator to the variable attenuator,
The controller includes a frequency band compensator,
wherein the frequency band compensator provides a compensation control signal having a large loss in a low frequency band and a small loss in a high frequency band to the variable attenuator.
delete According to claim 1, wherein the controller comprises a temperature compensator,
The automatic gain adjustment apparatus of claim 1, wherein a correction value for a current temperature of a signal receiving system is provided to the variable attenuator according to a temperature compensation table in which correction values for each temperature are stored.
delete The automatic gain adjustment apparatus according to claim 1, wherein a plurality of the variable attenuators are connected in series.

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