KR20090105752A - Method of transmitting pulse waveform in pulse-compression radar for detection of blind zone, pulse-compression radar using the same and radar network thereof - Google Patents

Abstract

PURPOSE: A method of transmitting pulse waveform in pulse-compression radar for detection of blind zone, pulse-compression radar using the same and radar network thereof are provided to detect short distance blind zone without damaging resolution using signal processing and pulse shape design. CONSTITUTION: The frequency-modulated first pulse shapes is transmitted for detecting the long distance with a predetermined cycle. The frequency-modulated second pulse shapes is transmitted for detecting the short distance is added to the first pulse shape. The pulse length of the second pulse shape is shorter than the pulse length of the first pulse shape. The frequency band of the first pulse shape and the second pulse shape is different. The first pulse shape and the second pulse shape are classified.

Description

Pulse compression radar and method for transmitting pulse waveforms for detecting shadow areas, pulse compression radar and radar network using the same }

The present invention relates to a pulse compression radar, and more particularly, to a pulse waveform transmission method and a method for using the same to solve a blind zone problem caused by the use of a long pulse having a high occupancy rate of the conventional pulse compression radar. Pulse compression radar.

In general, transmitting a waveform with large peak power and short pulse width in a pulse radar results in good detection performance and precise distance resolution at the receiving end.

Pulse compression technology transmits waveforms with small peak power and long pulse width in place of waveforms with large peak power and short pulse width. It refers to a technique of obtaining good distance resolution, such as when using a waveform having a short pulse width.

That is, pulse compression radars are widely used because they have the advantage of effectively using average power because they transmit long pulses and not having to make high peak power in the transmitter. In addition, in order to have a high resolution even in a long pulse duration, a code modulation or a frequency modulation is used for a transmission pulse and used for pulse compression signal processing.

However, since the radar detection distance is proportional to the radiated energy, a long pulse duration, i.e. a high pulse duty factor, is required to keep the detection distance with limited power. On the other hand, as long as the pulse width corresponds to the pulse width, the shadow zone (blind zone, eclipsing zone) is long, so additional measures are required to search for near objects from the radar.

In general, in the pulse radar method that uses a duplexer to share the transmission and reception antennas, the transmitter and the receiver alternately turn on and off. Equation 1 below is a formula for explaining the relationship between the duration of the transmission pulse and the shadow area.

 [Equation 1]

D _Z = (cⅹT _d ) / 2

Where D _Z is the shadow area, T _d is the duration of the transmission pulse, and c is the speed of propagation.

Within this shaded area D _Z , only a portion of the transmit pulse is reflected and transmitted to the receiver. In particular, in the case of using the pulse compression technique, the duration T _d of the transmission pulse becomes long, which causes a relatively large shadow area D _Z.

The first countermeasure is to adopt a continuous wave radar method that separates the transmitting and receiving antennas as a fundamental way to overcome the shadow area. In other words, since the transmitting and receiving antenna is used as a dual-use method, the transmitting and receiving antenna is separated and used as a solution to fundamentally solve the eclipsing effect caused by not receiving the reflected wave while transmitting a long pulse. However, it is not suitable when the size of the antenna needs to be increased for high resolution, such as weather radar, or when the whole system needs to be miniaturized.

The second solution is to use a short pulse separate from the long pulse to overcome the shadow area. Although it is possible to detect the near-field in this way, it is necessary to send two or more pulses to detect a section, and to process and adjust each of them accordingly, so that the correction of power values for long and short pulses ( This can be a major disadvantage for systems that require fast updates because the calibration must be precise and the scan time is more than doubled.

As a third countermeasure, a pulse nose coded by a method of detecting an object in an area shorter or longer than a detection distance defined by a pulse width and a transmission pulse in a high pulse occupancy radar, as disclosed in US Patent No. 5,036,324. Pulse compression is achieved by adding a data at the beginning and the end of the reflected signal by transmitting a transparent array waveform. This is a pulse compression technique using a PCM (Pulse Coded Modulation) modulation method. It may be beneficial in the detection of an object because some signals are arbitrarily added and pulse compression is performed. This makes it difficult to apply in applications that require measurements such as accurate reflection size.

An object of the present invention to solve the above problems, in the pulse compression technique using the frequency modulation to detect the near-shaded region without compromising the resolution using the design and signal processing of the pulse waveform without using a separate pulse To provide a pulse waveform transmission method that enables.

Another object of the present invention for solving the above problems, in the pulse compression technique using frequency modulation detection of the near-shaded region without loss of resolution by using the design and signal processing of the pulse waveform without using a separate pulse It is to provide a pulse compression radar that enables.

In order to achieve the above object, the present invention provides a method for transmitting a frequency modulated first pulse waveform for detecting a distance at a predetermined period and a second frequency modulated pulse waveform for detecting near field in addition to the first pulse waveform. And transmitting, wherein a pulse length of the second pulse waveform is shorter than a pulse length of the first pulse waveform, and different from a frequency band of the first pulse waveform and a frequency band of the second pulse waveform. It provides a pulse waveform transmission method of the pulse compression radar, characterized in that the first pulse waveform and the second pulse waveform to be distinguished.

Here, the modulation frequency bandwidth of the first pulse waveform may be configured substantially the same as the modulation frequency bandwidth of the second pulse waveform.

According to another aspect of the present invention, there is provided a transmission / reception antenna, a first pulse waveform for detecting a long range, and a second pulse waveform having a short duration compared to the first pulse waveform added to the first pulse waveform. Waveform generator for supplying a modulated baseband pulse waveform to different frequency bands, Transmitter for converting the baseband synthesized pulse waveform to a high frequency band for use by the radar, amplified and transmitted to the transmitting and receiving antenna and the transmitted pulse A transceiver configured to receive a reflected wave of a waveform through the transceiver antenna, a pulse compression signal processor for performing pulse compression and signal processing on the reflected wave received from the transceiver, and outputting a pulse compressed signal, and receiving the pulse compressed signal Control and data processing to perform data processing To provide a pulse compression radar, including.

The pulse compression signal processor may include a sampling unit configured to sample the reflected wave signal output from the transceiver unit by a section corresponding to a detection distance, and a frequency of each of the first and second pulse waveforms of the reflected wave passed through the sampling unit. A filtering unit for filtering the band and separating and outputting the first and second pulse waveforms, a pulse compression filter unit generating a pulse compression signal with respect to the separated and outputted first and second pulse waveforms; It may be configured to include a data combining unit for combining the pulse compression signal for the first pulse waveform and the second pulse waveform.

In this case, when the reflected wave signal output from the transceiver unit is an intermediate frequency signal, the pulse compression signal processor may convert the first pulse waveform and the second pulse waveform separately output from the filtering unit into a baseband signal to compress the pulse. It may be configured to further include a down converting unit for outputting to the filter unit.

In the case of using the pulse transmission method of the pulse compression radar according to the present invention and the pulse compression radar to which the method is applied, a short shadow region is included without reducing the resolution to a single pulse through a pulse compression technique using a frequency modulation method. Area can be detected.

In addition, with the development of technology, the pulse compression radar technology is increasingly used as the method is changed from a conventional vacuum tube method to a solid-state device, and the present invention relatively maintains the size of the entire system while reducing the scan time. By reducing the speed of the update, the shadow area problem can be solved.

The pulse transmission method and pulse compression radar of the pulse compression radar according to the present invention can be applied to weather radar, ship radar, detection radar and the like comprehensively.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

Terms such as first, second, A, and B 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 the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination 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. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Pulse transmission method of pulse compression radar

1A to 1C are conceptual views illustrating a pulse waveform transmission method of a pulse compression radar according to the present invention.

A pulse waveform transmission method of a pulse compression radar according to the present invention comprises the steps of: transmitting a frequency-modulated first pulse waveform for detecting a long distance at a predetermined period and a frequency-modulated agent for detecting near field in addition to the first pulse waveform; And transmitting the two pulse waveforms.

1A is a time-frequency graph illustrating the duration of a pulse waveform and a modulation frequency band according to the present invention.

Referring to Figure 1a, a pulse waveform used in the pulse transmission method of the pulse compression radar according to the present invention is illustrated. That is, in the pulse transmission method of the pulse compression radar according to the present invention, a pulse for detecting a long distance (first pulse waveform) 110 and a pulse for detecting a short distance (second pulse waveform) 120 are added and transmitted. The long distance detecting pulse 110 is transmitted during the interval t ₁ to t ₂ , and the short distance detecting pulse 120 is transmitted during the interval t ₂ to t ₃ .

At this time, the short-range detection pulse 120 is configured so that the duration is short enough compared to the long-range detection pulse 110 (for example, 4μsec vs 64μsec, 4μsec vs 128μsec, etc.), the long-range detection pulse is a long pulse duration It is configured to detect the shadow area generated by using the short-range detection pulse attached to the long-range detection pulse.

In addition, the first pulse waveform and the first pulse waveform may be formed by differently configuring a frequency band f ₁ to f ₂ where the first pulse waveform is frequency modulated and a frequency band f ₂ to f ₃ where the second pulse waveform is frequency modulated. The two pulse waveforms are separated. That is, at the receiving side, the reflected wave signal by the first pulse waveform and the reflected wave signal by the second pulse waveform are received at the receiving side by frequency-separating the reflected wave signal reflected from the target by the transmission pulse transmitted by the first pulse waveform and the second pulse waveform. It becomes possible to distinguish.

At this time, in order to equalize the resolution of the near-far detection and detection of the first pulse waveform is a frequency modulated frequency band (f ₁ ~ f ₂₎ frequency bandwidth (│f ₁ -f ₂ │) and a second pulse waveform of frequency The frequency bandwidths | f ₂ -f ₃ | of the modulated frequency bands f ₂ to f ₃ may be configured substantially the same.

The frequency bands of the first pulse waveform and the second pulse waveform should be selected in a range that does not affect the baseband signal processing, and the actual signal generation of the first pulse waveform and the second pulse waveform This can be done using a Direct Digital Synthesis (DDS).

Figure 1b is a time-signal graph for explaining the duration and signal size of the pulse waveform in accordance with the present invention.

That is, FIG. 1B is a graph again showing the pulse waveform according to the present invention shown in the time-frequency relationship of FIG. 1A in the time-signal magnitude relationship.

For example, as illustrated in FIG. 1B, the first pulse waveform 110 for the remote detection has a duration of 64 μsec, while the second pulse waveform 120 for the near detection is configured to have a duration of 4 μsec. Can be.

1C is a time-signal graph with pulse shaping applied to a pulse waveform according to the present invention.

The uniform amplitude of the linear frequency-modulated pulse waveform can cause large range side lobes to obscure small targets near large targets or cause errors in the separation of the targets. Can reduce the distance side lobe. FIG. 1C illustrates an example in which pulse shaping using a commonly used cosine function is applied.

Meanwhile, in an embodiment of the pulse waveform transmission method of the pulse compression radar according to the present invention illustrated in FIGS. 1A to 1C, a short range is added in addition to the first pulse waveform to solve the shadow area problem caused by the first pulse waveform. Transmitting a second pulse waveform for detection is illustrated.

However, in order to solve the shadow area problem caused by the first pulse waveform, the pulse compression radar pulse waveform transmitting method according to the present invention is only an embodiment of transmitting a second pulse waveform having a shorter duration than the first pulse waveform. The present invention is not limited thereto, and may include transmitting a third pulse waveform having a shorter duration than the second pulse waveform to the second pulse waveform in order to solve the shadow area problem caused by the second pulse waveform. That is, since the shadowed area may be generated by the second pulse waveform, the shadowed area by the second pulse waveform is also detected by transmitting a third pulse waveform shorter than the second pulse waveform to the second pulse waveform. can do. In this case, the second pulse waveform and the third pulse waveform may also be modulated in different frequency bands so as to be distinguished from each other.

For example, when the first pulse waveform has a duration of 128 μsec, a second pulse waveform having a duration of 32 μsec in addition to the first pulse waveform is transmitted, and a third having a duration of 4 μsec in addition to the second pulse waveform. The pulse waveforms distinguished by the frequency bands may be configured to have a multi-step duration by transmitting the pulse waveforms.

The configuration of the pulse compression radar described below illustrates the configuration of a pulse compression radar for transmitting pulses divided into a first pulse waveform and a second pulse waveform, but as described above, the first pulse waveform, the second pulse waveform, and the like. The configuration of transmitting a pulse divided into a third pulse waveform may also be modified based on the configuration described below. Similarly, a configuration consisting of a first pulse waveform, a second pulse waveform, a third pulse waveform, and a fourth pulse waveform, and an extended configuration thereof, may also be possible.

Configuration of Pulse Compression Radar

2 is a block diagram showing a configuration example of a pulse compression radar according to the present invention.

2, the pulse compression radar 200 according to the present invention includes a transceiver antenna 210, a waveform generator 220, a transceiver 230, a pulse compression signal processor 240, and a control and data processor 250. It may be configured to include).

The transmit / receive antenna 210 radiates a transmission pulse transmitted from the transceiver 230 to a space, and receives and transmits the reflected wave reflected from the target object to the transceiver 230. In most modern radars, a transmitting antenna and a receiving antenna are composed of a single antenna using a duplexer (also referred to as a duplexer, a transceiver, or a TR-Transmit / Receive switch). For example, when radiating a transmission pulse waveform, it operates as a transmitting antenna, and when receiving a reflected wave, it operates as a receiving antenna.

The waveform generator 220 generates a baseband pulse waveform and supplies it to the transceiver 230. That is, the waveform generator 220 generates a baseband pulse waveform consisting of a first pulse waveform for detecting a long distance and a second pulse waveform having a short duration compared to the first pulse waveform added to the first pulse waveform. It is a component.

In detail, the waveform generator 220 uses the long pulse (first pulse) 110 and the short pulse (second pulse) 120 described above with reference to FIG. As illustrated, f ₁ to f ₂ , f ₂ to f ₃ ) are modulated and generated, and the generated baseband pulse waveform is supplied to the transceiver 230. Accordingly, the waveform generator 220 adjusts the long pulse and the short pulse by an accurate duration (for example, t ₁ to t ₂ and t ₂ to t ₃ in FIG. 1A) every predetermined period (Pulse Repetition Time). It generates and supplies to the transceiver 230.

The transmitter / receiver 230 includes a transmitter 231 and a receiver 232, and includes a transmitter 231 and a receiver 232 in the configuration example of the pulse compression radar according to the present invention illustrated in FIG. 3. This is called the transceiver 230. That is, in the present invention, the 'transmitter and receiver' is a component that collectively names the components of the transmitter and the receiver.

The transmitter 231 included in the transceiver 230 receives the baseband pulse waveform generated by the waveform generator 220, up-converts and amplifies the baseband pulse waveform to a high frequency band for use by the radar. It serves to convey. To this end, the transmitter 231 may include a modulator, a high frequency power source (oscillator / amplifier), a power supply, and the like.

For example, high frequency oscillators, frequency mixers, filters to remove unwanted noise, high-frequency power amplifiers (solid-state power amplifiers) or traveling wave tubes (TWT) It may have a configuration of a power amplifier and a power supply.

The receiver 232 included in the transceiver 230 may have a configuration of a super-heterodyne scheme, and in this case, an RF amplifier and amplified RF for amplifying the reflected wave RF signal input from the transceiver antenna. And a frequency mixer and a local oscillator (LO) for converting the signal into an intermediate frequency (IF) signal, an IF amplifier and a filter for amplifying the output intermediate frequency signal, and the like. .

Meanwhile, although the configuration of the receiver 232 described above describes a super heterodyne method of converting a reflected wave RF signal into an intermediate frequency signal, the receiver may be configured to directly convert a baseband signal from an RF signal.

In addition, the receiver 232 may convert the RF signal into an intermediate frequency and output an intermediate frequency signal, or convert the intermediate frequency signal into a baseband signal and output a baseband signal. As described above, the RF signal may be converted directly into a baseband signal to output a baseband signal.

The pulse compression signal processor 240 is a component that detects an object by performing pulse compression and signal processing on the reflected wave received from the transceiver 230 via the transceiver antenna 210.

Finally, the control and data processor 250 receives the pulse compression signal for the first pulse waveform and the pulse compression signal for the second pulse waveform output to the pulse compression signal processor 240 to perform data processing to the user. The component to display.

3 is a block diagram showing an example of a configuration of a pulse compression signal processing unit that can be used in the pulse compression radar according to the present invention.

Referring to FIG. 3, the pulse compression signal processor 240 used in the pulse compression radar according to the present invention includes a sampling unit 241, a filtering unit 242, a pulse compression filter unit 244, and a data combining unit 245. It may be configured to include. In addition, the pulse compression signal processor 240 may include a down converting unit 243 as an optional component.

The sampling unit 241 is a component for sampling the intermediate frequency signal or the baseband signal received and output by the transmission and reception by a section corresponding to the detection distance, and includes an analog digital converter (ADC). Can be. That is, the sampling unit 241 is a component that converts the received reflected wave signal as a digital signal.

In this case, the signal output from the transceiver 230 may be an intermediate frequency signal or a baseband signal according to the configuration of the receiver 232 included in the transceiver 230 as described above. Sampling rate is determined.

That is, when the reception unit 232 included in the transmission and reception unit 230 described above outputs the intermediate frequency signal to the sampling unit 241 and outputs the baseband signal to the sampling unit 241, the sampling is performed. The configuration of the unit 241 may vary.

The filtering unit 242 includes band pass filters (BPFs) for filtering the first pulse waveform and the second pulse waveform from the signal sampled by the sampling unit 241, respectively. It is a component that separates and outputs a second pulse waveform.

For example, the filtering unit 242 separates the first pulse waveform from the output of the sampling unit 241 and outputs the first band pass filter 242-1 and the second band pass filter that separates and outputs the second pulse waveform. 242-2.

The down converting unit 243 is a component for down converting the first pulse waveform and the second pulse waveform separated from the filtering unit 242 into a baseband signal, and may be implemented by a frequency synthesis process in the digital domain. Here, the down converting unit 243 is an optional component and is output as a baseband signal by the down converting unit when the signal output from the receiving unit 232 is an intermediate frequency signal. That is, when the signal output from the receiver 232 is a baseband signal, the down converting unit 243 may be omitted.

For example, the down converting unit 243 includes a first down converter 243-1 for down-converting the filtered first pulse waveform to the baseband and a second down converter 243- down-converting the second pulse waveform to the baseband. It can be configured to include 2).

The pulse compression filter 244 is a component that generates a pulse compression signal, and is a component that generates a pulse compression signal for the first and second pulse waveforms output from the down-converting unit. It can be implemented as.

For example, the pulse compression filter 244 may include a first matched filter 244-1 for generating a pulse compression signal for a first pulse waveform and a second matched filter for generating a pulse compression signal for a second pulse waveform ( 244-2).

In FIG. 3, the matched filters 244-1 and 244-2 receive and compress the baseband reference signals of the first pulse waveform and the second pulse waveform from the waveform generator 220 in a coherent processing manner. The configuration for generating a signal is illustrated.

Finally, the data combiner 245 is a component that combines and outputs the pulse compression signal for the first pulse waveform and the pulse compression signal for the second pulse waveform output from the pulse compression filter 244.

4A to 4E are conceptual views illustrating simulation results of a pulse compression radar according to the present invention.

4A is a time-signal graph illustrating the transmit pulse waveform used in a pulse compression radar according to the present invention.

The transmission pulse waveform illustrated in FIG. 4A is a first pulse waveform 410 having a long duration and a second pulse having a short duration similar to those disclosed in the pulse transmission method of the pulse compression radar according to the present invention described with reference to FIG. 2A. A transmit pulse consisting of waveform 420 is illustrated.

For example, a long pulse (first pulse waveform) 410 having a duration of 128 μsec and a short pulse (second pulse waveform) 420 having a duration of 4 μsec are added and combined. In addition, it can be seen that the pulse shaping is performed using a cosine function to suppress the distance side lobe.

4B is an exemplary diagram of a received signal simulated by a pulse compression radar according to the present invention. In FIG. 4B, a simulated reception signal is generated when it is assumed that a detection object exists at 680m, 5km, 15km, 20km, 30km, 55km and 80km, respectively. In addition, the signal attenuation with distance is not reflected in the simulation.

4C and 4D illustrate the appearance of a pulse compressed received signal for a short pulse and a pulse compressed received signal for a long pulse in a pulse compression radar according to the present invention.

Finally, Figure 4e is a distance-received signal size graph showing the pulse-compressed received signal in one distance axis in the pulse compression radar according to the present invention.

As illustrated in FIG. 4E, 680 m (501), 5 km (502), 15 km (503), 20 km (504), 30 km (505) when combined to express a pulse-compressed received signal with one distance axis, It can be seen that all of the detection objects assumed to exist at the 55 km (506) and 80 km (507) points are detected.

Construction of Radar Network using Pulse Compression Radar

On the other hand, as one of the embodiments using the pulse compression radar according to the present invention, it is possible to implement the configuration of the radar network.

5 is a conceptual diagram illustrating the necessity of a radar network using a pulse compression radar according to the present invention.

As shown in FIG. 5, even if one long-range detection radar is used, in the case of the radar placed on the ground, an area H cannot be detected due to the radius of curvature of the earth.

For example, an undetectable area is generated even when an installation angle of the radar antenna is set to 0 degrees, and an area that cannot be detected is generated due to the detection distance R _MAX and the radius of curvature of the earth. The relationship can be represented by Equation 2 below.

[Equation 2]

H = (R _MAX /4.12) ²

Therefore, when R _MAX is 230Km, 120Km, 60Km, and 30Km, the area H that cannot be detected by the radius of curvature of the earth reaches 3,116m, 848m, 212m, and 53m.

As one solution to this problem, there may be a method of increasing the quality of service (QoS) by configuring a network with a plurality of radars and scanning an area desired by a user according to the current situation and purpose.

In addition, in the case of configuring a network with a plurality of radars, the radars may be separated by separate transmitters and receivers of the radar, as well as conventional mono-static (radar transmitting pulses and radar receiving reflection pulses). It is also possible to configure bi-static or multi-static, which results in a covering common area. In this case, the existing mono-static radar can only observe the one-dimensional visual velocity (radial velocity related to the scanning direction of the radar) while the two-dimensional velocity (vector component) can be measured. do. In other words, by configuring a network with a radar, accurate measurement for tracking the trajectory of a detection object becomes possible.

6A and 6B are conceptual views illustrating a radar network concept using a pulse compression radar according to the present invention.

FIG. 6A illustrates a radar configuration using one long-range large radar having a detection distance r, and FIG. 6B illustrates clustering of seven short-range small radars having a detection distance r / 2. The configuration of the radar network is illustrated.

In addition, when implementing a radar network using a pulse compression radar according to the present invention, it can be seen that it is possible to use an efficient frequency band by applying the concept of frequency reuse, such as cell design of a mobile communication network. have.

7A and 7B are conceptual views illustrating a concept of frequency reuse of a radar network using a pulse compression radar according to the present invention.

For example, the case illustrated in FIG. 7A is a case in which a radar network is configured using four frequency bands, and different frequency bands are used between adjacent radar cells, and frequency bands are reused in non-adjacent radar cells. In the same manner, the case illustrated in FIG. 7B corresponds to a case where a radar network is configured using seven frequency bands.

In most mountainous applications (e.g., in Korea), long-range radars do not perform well, and low-cost, small radars may be suitable for networks (particularly weather radar applications).

In particular, in the case of a pulse compression radar, it is possible to configure a transmitter using a solid element having a reduced size, volume, weight, and the like compared to the conventional vacuum tube method, and the stability can be increased. It may be suitable for constructing a network.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

1A to 1C are conceptual views illustrating a pulse waveform transmission method of a pulse compression radar according to the present invention.

2 is a block diagram showing a configuration example of a pulse compression radar according to the present invention.

3 is a block diagram showing an example of a configuration of a pulse compression signal processing unit that can be used in the pulse compression radar according to the present invention.

4A to 4E are conceptual views illustrating simulation results of a pulse compression radar according to the present invention.

5 is a conceptual diagram illustrating the necessity of a radar network using a pulse compression radar according to the present invention.

6A and 6B are conceptual views illustrating the concept of a radar network using a pulse compression radar according to the present invention.

7A and 7B are conceptual views illustrating a concept of frequency reuse of a radar network using a pulse compression radar according to the present invention.

<Description of the symbols for the main parts of the drawings>

210: transmit and receive antenna

220: waveform generator

231: transmitter 232: receiver

240: pulse compression processing unit 250: control and data processing unit

Claims (5)

Transmitting a frequency modulated first pulse waveform for detecting a distance at a predetermined period; And Transmitting a frequency modulated second pulse waveform for detecting near field in addition to the first pulse waveform, The pulse length of the second pulse waveform is shorter than the pulse length of the first pulse waveform, and the frequency band of the first pulse waveform and the frequency band of the second pulse waveform are different from each other. A pulse waveform transmission method of a pulse compression radar, characterized in that the second pulse waveform is divided. The method of claim 1, And a modulation frequency bandwidth of the first pulse waveform is substantially the same as a modulation frequency bandwidth of the second pulse waveform. Transmit and receive antennas; Waveforms comprising a first pulse waveform for remote detection and a second pulse waveform having a short duration compared to the first pulse waveform appended to the first pulse waveform, and supplying a modulated pulse waveform in different frequency bands, respectively. Generator; A transceiver configured to receive the baseband pulse waveform, convert it into a high frequency band for use by a radar, amplify it, and transmit the amplified signal to the transmit / receive antenna; A pulse compression signal processor configured to output pulse compression signals by performing pulse compression and signal processing on the reflected waves received from the transceiver; And And a control and data processor configured to receive the pulse compression signal and perform data processing. The method of claim 3, wherein The pulse compression signal processing unit A sampling unit for sampling the reflected wave signal output from the transceiver unit by a section corresponding to a detection distance; A filtering unit filtering the reflected wave passing through the sampling unit into a frequency band of each of the first pulse waveform and the second pulse waveform to separate and output the first pulse waveform and the second pulse waveform; A pulse compression filter unit generating a pulse compression signal with respect to the separated and outputted first and second pulse waveforms; And And a data combiner configured to combine a pulse compression signal for the first pulse waveform and the second pulse waveform. The method of claim 4, wherein When the reflected wave signal output from the transceiver is an intermediate frequency signal, The pulse compression signal processing unit may further include a down-converting unit for frequency converting a baseband signal from the first pulse waveform and the second pulse waveform separately output from the filtering unit and outputting the baseband signal to the pulse compression filter unit. .

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