KR102132455B1 - Active and Passive Complex Sensor That Operates in Frequency Division - Google Patents

Abstract

The embodiments provide an active and passive complex sensor operating in a frequency division method, which transmits a radio frequency signal and a radiometer signal received from an antenna through a common path, distributes the received radio frequency signal and the received radiometer signal through a distributor connected to the common path as an active signal and a passive signal in accordance with a first path and a second path, and applies a filter bank.

Description

Active and Passive Complex Sensor That Operates in Frequency Division}

The technical field to which the present invention pertains relates to a passive sensor and a guided weapon operating in a frequency division manner.

The contents described in this section merely provide background information for this embodiment, and do not constitute a prior art.

A complex mode sensor using a radio frequency (RF) sensor and a radio meter sensor in one system has been developed. The system bandwidth is used to separate the electrical characteristics of the RF sensor and the radiometer sensor. Such a general system limits the agility performance and frequency modulation bandwidth of the RF sensor, and the lamiometer sensor is affected by the temperature resolution performance due to the bandwidth limitation.

The system equipped with the existing RF sensor and radiometer sensor uses the RF sensor and radiometer sensor completely separated according to the application. For example, the RF sensor mode and the radiometer sensor mode are switched. A system equipped with an existing RF sensor and a radiometer sensor uses the received signal by electrically decomposing the bandwidth to allocate a portion of the system bandwidth to the RF sensor and the remaining bandwidth to the radiometer sensor.

Korean Registered Patent Publication No. 10-1788259 (October 13, 2017)

Embodiments of the present invention includes a millimeter wave receiving unit and an intermediate frequency receiving unit in which the multi-pass passive sensor transmits a radio frequency signal and a radio meter signal received from an antenna in a common path, and receives radio through a distributor connected to a common path. The main object of the invention is to divide the frequency signal and the received radiometer signal into active and passive signals according to the first path and the second path, and to operate in a frequency division manner by applying a filter bank.

Still other unspecified objects of the present invention can be further considered within the scope of being easily deduced from the following detailed description and its effects.

According to an aspect of the present embodiment, in a multi-sensory complex sensor operating in a frequency division method, a millimeter wave receiver for transmitting a radio frequency signal and a radio meter signal received from an antenna to a common path, and a distributor connected to the common path Provided is an active passive sensor including an intermediate frequency receiver for distributing the received radio frequency signal and the received radio meter signal into active and passive signals according to the first path and the second path.

As described above, according to the embodiments of the present invention, the passive passive sensor includes a millimeter wave receiver and an intermediate frequency receiver, and transmits a radio frequency signal and a radiometer signal received from an antenna in a common path, and a common path. Radio frequency signal and radiometer signal received through the splitter connected to the active and passive signals are distributed according to the first and second paths, and filter banks are applied to operate in a frequency division manner. have.

Even if the effects are not explicitly mentioned herein, the effects described in the following specification expected by the technical features of the present invention and the potential effects thereof are treated as described in the specification of the present invention.

1 is a view illustrating a multi-functional passive sensor operating in a frequency division method according to an embodiment of the present invention.
2 is a view illustrating the flight path of the navigator-equipped guided weapon.
3 is a diagram illustrating an operation of an explorer at the end induction phase.
4 is a view illustrating an existing RF sensor and a searcher equipped with a radiometer sensor.
5 is a block diagram illustrating a frequency division method using a duplexer.
6 is a diagram illustrating a frequency domain of a frequency division method using a duplexer.
7 is a diagram illustrating a signal processing output of a frequency division method using a duplexer.
8 is a block diagram illustrating a search apparatus using an RF sensor and a radiometer sensor simultaneously according to an embodiment of the present invention.
FIG. 9 is a diagram illustrating a hardware configuration of a search device using both an RF sensor and a radiometer sensor according to an embodiment of the present invention.
FIG. 10 is a diagram illustrating a time division operation of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.
FIG. 11 is a diagram illustrating an active RF clutter of an end-tracking step of a search apparatus using a RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.
12 is a diagram illustrating signal processing of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.
FIG. 13 is a diagram illustrating a multiplicative time-division operation of a passive device of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.
14 is a diagram illustrating that a navigation device using an RF sensor and a radiometer sensor according to another embodiment of the present invention acquires passive data during a time division operation.
FIG. 15 is a diagram illustrating a filter bank of a radiometer reception path of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.
FIG. 16 is a diagram illustrating an operation in which a search device using an RF sensor and a radiometer sensor according to another embodiment of the present invention divides a passive signal frequency using a filter bank.
17 is a diagram illustrating a bandwidth of an adaptive filter bank of a search apparatus using an RF sensor and a radiometer sensor at the same time according to another embodiment of the present invention.
18 to 21 are block diagrams illustrating filter banks of a search device using an RF sensor and a radiometer sensor simultaneously according to embodiments of the present invention.
22 is a diagram illustrating an operation of frequency separating a search device using an RF sensor and a radiometer sensor at the same time using a filter bank according to another embodiment of the present invention.
23 is a diagram illustrating an operation in which a search device using an RF sensor and a radiometer sensor according to another embodiment of the present invention divides the frequency of a passive signal using a filter bank.

Hereinafter, when it is determined that the subject matter of the present invention may be unnecessarily obscured by those skilled in the art with respect to known functions related to the present invention, the detailed description will be omitted, and some embodiments of the present invention will be omitted. It will be described in detail through exemplary drawings.

Guided weapons targeting the enemy's main military facilities or aircraft carriers on the sea tend to fly with trajectories at high grazing angles at the apocalypse stage to evade enemy air defense networks and maximize target force. A guided weapon equipped with a conventional IR-based sensor has a shorter target detection distance than a RF sensor, and has difficulty in target acquisition/tracking due to acute weather conditions and aerodynamic heating of the guided weapon maneuvering at high speed. Guided weapons based on active RF sensors satisfy a relatively long detection distance and can be operated in all weather, but have difficulty in target tracking due to deterioration of the signal-to-clutter ratio (SCR) due to high surface angle at the end stage.

The concept of guided weapons equipped with complex sensors is emerging, and systems using active RF sensors and passive radiometers, for example, are being studied. The radiometer is a system that measures the intrinsic radiation energy of an object, and can avoid SCR deterioration due to the operation of an active sensor at the end stage.

Early/medium induction is performed using an RF sensor that guarantees a relatively long detection distance and can be operated in all weather, and end-stage tracking is performed using a radiometer.

1 is a view illustrating a multi-functional passive sensor according to an embodiment of the present invention.

Nungsu passive composite sensor 30 includes a millimeter wave receiver 300 and an intermediate frequency receiver 400, and operates in a frequency division manner.

The millimeter wave receiver 300 transmits radio frequency signals and radio meter signals received from the antenna through a common path.

The millimeter wave receiving unit 300 includes a radio frequency signal received from an antenna, a frequency converter 310 for amplifying and synthesizing the radiometer signal, and a calibration source 320 for correcting the received radiometer signal.

The intermediate frequency receiver 400 distributes the radio frequency signal and the received radiometer signal received through the splitter 410 connected to the common path into active and passive signals according to the first path and the second path.

The intermediate frequency receiver 400 includes an active receiver 420 for amplifying and converting the distributed active signal and a passive receiver 430 for amplifying and converting the distributed passive signal.

The passive receiver 430 applies a filter bank 440 that separates a plurality of frequency bands into the distributed passive signal.

The filter bank 440 is connected to a distributor to select a connection or cutoff of the signal path, a plurality of frequency filters connected in parallel to the shear switch, and a plurality of frequency filters connected to select a connection or cutoff of the signal path. It may include a rear end switch.

The filter bank 440 is connected to a distributor to mix signals by a shear combiner, a plurality of switches connected in parallel to the shear combiner, a plurality of frequency filters respectively connected to the plurality of switches, and a plurality of frequency filters connected to mix the signals It may include a back-end linking group.

The filter bank 440 may include a multiplexer connected to a distributor to select signals, a plurality of switches connected in parallel to the multiplexer, and a coupler connected to the plurality of switches to mix signals.

The filter bank 440 may include a front end multiplexer connected to a distributor to select signals, a plurality of switches connected in parallel to the front end multiplexers, and a rear end multiplexer connected to the plurality of switches to select signals.

The filter bank 440 may set a frequency band allocated to the radio frequency signal based on the maximum Doppler frequency of the target.

The active receiver processes the active signal as it is, and the passive receiver can remove the frequency band corresponding to the radio frequency signal from the passive signal.

Passive receiver performs frequency variability (Frequency Agility) on the radio frequency signal, or if the frequency of the radio frequency signal is a narrow band, a plurality of frequency bands belonging to the filter bank among a plurality of frequency bands corresponding to the radio frequency signal frequency band It may include a filter bank controller 450 to deactivate.

The number and bandwidth of the plurality of frequency bands belonging to the filter bank may be set based on the behavior of the waveform of the radio frequency signal or the frequency allocation area.

FIG. 2 is a diagram illustrating a flight path of a navigation-equipped guided weapon, and FIG. 3 is a diagram illustrating a navigation operation in an apocalyptic induction phase.

The flight paths 1a, 1b, 1c, 1d, and 1e of the guided weapon equipped with the explorer are composed of a booster stage, a middle stage guided stage, and an end guided stage. The explorer is a concept that operates at the end of the guided weapon from the point of view of the guided weapon. The difference from the existing guided weapon is that the guided weapon trajectory is modified in order to obtain/track the target, and the grazing angle is relatively smooth. I can make it.

When the explorer is operated, i.e., focusing only on the end induction phase, the RF sensor can be used to obtain a relatively long detection distance in the first step, and the laminometer sensor is used to exclude the clutter effect in the second step. To use.

4 is a view illustrating an existing RF sensor and a searcher equipped with a radiometer sensor. 5 is a block diagram illustrating a frequency division method using a duplexer. 6 is a diagram illustrating a frequency domain of a frequency division method using a duplexer. 7 is a diagram illustrating a signal processing output of a frequency division method using a duplexer.

Referring to FIG. 4, a signal received from an antenna is separated using a duplexer to directly separate an active RF signal and a passive radiometer signal from a frequency point of view. As shown in FIG. 6, signals are separated and used in the frequency domain, and the entire system bandwidth is divided and used by the RF sensor and the radiometer sensor. Subsequent signals are configured in parallel, and when the active RF sensor signal outputs N results as shown in FIG. 7, the passive radio meter signal may output 1 results. In general, the collection time of the passive radiometer sensor is long.

(Operational split view) In an environment where it is difficult to use only one sensor, it is possible to completely switch and use both sensors, resulting in accuracy and temporal system loss in target acquisition/tracking.

(Frequency split point of view) The RF sensor has excellent performance in proportion to the bandwidth to achieve electronic warfare and high resolution distance resolution. However, the bandwidth is limited for electrical separation, which affects the performance of the function. The radiometer sensor determines the temperature resolution performance in proportion to the square root of the system bandwidth, which affects the performance of the function due to bandwidth limitations.

5 shows a structure from the perspective of a receiver equipped with a conventional RF sensor and a radiometer sensor. The RF common part is used from the antenna to the receiver input, and the signal is separated by a duplexer. The radiometer receive path includes a calibration source module for calibration. The basic operation method of the radiometer sensor and the RF sensor will be omitted since it is a technical content easily recognized by a person skilled in the art.

The conventional method has an excellent advantage in terms of frequency isolation. On the other hand, since the passive passive sensor divides and writes a given system bandwidth, it affects performance in terms of system operation and performance. First, as the active RF sensor performs frequency agile in a wide area, the response capability of the electronic warfare is improved, and high resolution distance resolution can be implemented using a frequency modulation (FM) technique using a wide bandwidth. Next, according to the formula, the wider the bandwidth, the better the temperature resolution. The minimum detectable temperature (MDT) or resolution, one of the radiometer's performance indices, is shown in Equation 1. (Tsys is the temperature of the system, B is the bandwidth, and τ is the integration time.

The search apparatus according to the present embodiment is a structure and an operation method using both time division and frequency division techniques, so that both sensors are maximized in terms of frequency bandwidth. The biggest difference from the existing method is to include a filter bank in the radiometer path. By using the filter bank of the radiometer path, the RF sensor can suppress the RF sensor signal present on the radiometer path while taking full advantage of the system bandwidth.

8 is a block diagram illustrating a search apparatus using an RF sensor and a radiometer sensor simultaneously according to an embodiment of the present invention, and is an example of a receiver having a superheterodyne structure. The RF common path can be configured above the M/W (Micro Wave) receiver, or the M/W receiver can be configured to input the IF receiver. It may vary depending on the development conditions. The output of the M/W receiver is divided into a divider to construct an RF sensor signal path and a radiometer signal path. The RF signal path can be configured with no narrow-band filter, so that the entire bandwidth provided by the system can be used.

FIG. 9 is a diagram illustrating a hardware configuration of a search device using both an RF sensor and a radiometer sensor according to an embodiment of the present invention.

The navigation device may be implemented as a passive composite sensor that processes radiometer sensors and RF sensor sensors.

The search apparatus includes a 6-channel receiver (3 channels of radiometer & 3 channels of RF sensor signal) and a signal processor for simultaneously processing radiometer signals and RF sensor signals using a monopulse pattern.

The power supply unit generates power for each module.

The frequency synthesizer generates a frequency and a reference signal.

The signal processing unit processes radiometer and RF sensor acquisition signals and controls each module using the processing results.

The transmitter amplifies the signal generated by the frequency synthesizer to generate an RF sensor output.

The antenna radiates the RF sensor output, receives the RF sensor target reflected signal and receives the radiometer signal.

The millimeter wave receiver includes a HOT (high temperature)/COLD (low temperature) small measurement module for amplifying the signal received from the antenna and synthesizing the LO1 and correcting the radiometer signal.

The intermediate frequency receiver distributes the output of the millimeter wave receiver to generate 3 channels of radiometer and 3 channels of RF sensor, signal amplification and LO2 synthesis.

The gimbal part is a mechanical structure for directing the antenna at a specific angle.

The servo part controls the movement of the gimbal part.

FIG. 10 is a diagram illustrating a time division operation of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention. FIG. 11 is a diagram illustrating an active RF clutter of an end tracking step of a search apparatus using a RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.

The RF sensor transmission pulse is the RF sensor's transmission output, which amplifies the signal generated by the frequency synthesizer at the transmitter and radiates it toward the target through the antenna. The transmission pulse is determined according to the detection distance and distance resolution. When operated simultaneously with the radiometer sensor, a transmission pulse that satisfies the RF sensor detection distance similar to the target identification distance of the radiometer sensor can be designed.

The pulse repetition rate (PRI) needs to separate transmission and reception temporally in a system using a single antenna, and indicates the pulse repetition period of the RF sensor.

The RF sensor receiving section can predict the position of the signal received on the time axis if the distance value can be estimated by the RF sensor acquisition signal. At this time, effective distance gating should be performed in consideration of the activation of the target signal and uncertainty in the process.

The radiometer receiving section measures the natural radiant energy of an object and is independent of the distance of the object. In fact, it is possible to receive the data of the radiometer between the receiving areas. However, since it measures the signal of the noise level, the radiometer signal is obtained in a section excluding the RF sensor reception section.

The active processing memory is a memory that stores data acquired in the RF sensor reception section and can extract signals in hardware and software.

The passive processing memory is a memory that stores data acquired in a radiometer reception section and can extract signals in hardware and software.

When describing the operation concept of the time division technique, first, a position to be received in an active RF pulse repetition interval (PRI) operated using a target distance tracking value is predicted. The initial distance tracking value is obtained by operating the RF sensor.

Next, the free region of the active RF sensor signal is set, and after division in the time axis of the active/passive region, each is stored in an independent memory.

And each of them performs parallel signal processing and combines the results if necessary.

If the existing frequency division method is a duplexer, that is, a band pass filter to separate the two signals without interference, the separation of the two signals in the proposed time division method isolates the two signals through transmission and reception gating. The transmission pulse gating is set to exclude the effect of the RF leakage signal, such as a switch delay, and can be set using measurement values. In the RF sensor reception signal area gating, a side lobe signal according to an antenna radiation pattern is received, and may be represented as shown in FIG. 11. That is, the distance difference between the main lobe clutter and the AR clutter can be estimated as a time axis and applied to the Early Gate.

12 is a diagram illustrating signal processing of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.

The search device acquires a signal from the output of the intermediate frequency receiver, separates the radio meter signal section and the RF sensor signal section using the estimated distance, processes each signal, and controls the hardware after fusion of the results.

The signal acquisition operation receives the output of an intermediate frequency receiver in which a radio meter and an RF sensor reception signal are mixed every signal processing cycle (CPI).

The signal separation/extraction operation uses the target distance estimated in the previous signal processing cycle to separate the effective range of the radiometer sensor and the effective range of the RF sensor and stores them in each memory.

Memory #2 is a data storage memory for the effective period of the radiometer sensor. Memory #1 is an RF sensor valid section data storage memory.

The RF sensor signal processing operation processes the RF sensor signal for target acquisition using the extracted data of memory #1. For example, general signal processing such as average, constant false alarm rate (CFAR), and pattern recognition is performed.

The radiometer signal processing operation processes the radiometer signal for target acquisition using the extracted data of memory #2. For example, general signal processing such as average, constant false alarm rate (CFAR), and pattern recognition is performed.

The result fusion operation fuses the results according to conditions using each target detection/tracking information.

The hardware control operation generates the next hardware control command from the target detection/tracking result.

FIG. 13 is a diagram illustrating a multiplicative time-division operation of a passive device of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.

The output of the RF sensor and the radiometer sensor is obtained from the IF receiver, and the obtained signal separates the active section and the passive section. The active signal is obtained without separate processing and extracted/separated with respect to the cell of interest, and the passive signal removes the section of the active signal in the distance direction among the entire acquired signals. Each separated signal performs target detection/tracking suitable for the sensor. However, in the case of a passive radiometer signal, an n-th delay line canceler may be applied to remove the remaining side lobe clutter.

In general, since the passive radiometer sensor has a longer dwell time than the active RF sensor, the M period (M is a positive number greater than 1) can be performed when the passive signal processing is 1 cycle. At the end of the acquisition, the signal combines the results of the tracking of the two sensors to perform the final target tracking, and the updated distance tracking value is transmitted to the signal separation block together with the altitude value of the guided weapon for signal separation.

14 is a diagram illustrating that a navigation device using an RF sensor and a radiometer sensor according to another embodiment of the present invention acquires passive data during a time division operation.

Conventional technology has the advantage of separating the signal at the front end of the receiver in the frequency domain so that each signal has high isolation without loss of gain and can simultaneously operate active/passive sensors, but the bandwidth of the two sensor signals divides the entire system bandwidth. For use, it has an impact on system operation and performance.

The radar-based RF sensor performs frequency agility to improve the response to electronic warfare, and enables high-resolution distance resolution by using a wideband frequency modulation (FM) technique. Radiometer sensors also have a temperature resolution proportional to the square root of the receiver bandwidth. The smaller the temperature resolution, the more advantageous it is to distinguish the target from the background.

The proposed technique performs frequency agile in a wide range to improve the response to electronic warfare, and applies a frequency modulation technique using a wide bandwidth to realize a high resolution distance resolution. From a radiometer point of view, the temperature resolution performance is improved by extending the bandwidth. Also, depending on the situation around the target, a time division technique or a frequency division technique can be selectively applied, and since the frequency division technique uses a filter bank unlike the conventional technique, only one region of the RF sensor that uses the RF sensor is excluded. The radiometer provides a much larger bandwidth than the conventional technology, and the active RF sensor also does not separate frequencies from the beginning, so the frequency agility is high. Separation of the signal with a divider, not a duplexer, and some time-sharing losses in the time-division.

First, the reason why there is no problem in using a divider other than a duplexer is that sufficient RF sensor power is guaranteed at the time of using the passive sensor, and the passive sensor takes up the target area compared to the beam fill factor (BFF) rather than the signal strength. ) Is more important.

Second, the loss in the collection time is effectively formed by more than 90% of the active mode non-receiving area. The active mode acquisition time is X ms or less, and the passive mode acquisition time is Y ms or less. Y can be set to multiples of X. The PRF can acquire targets within tens of kilometers at tens of kHz. Transmit gating is the sum of the transmit pulse and the gate. The received signal gating may be set in the left area (target position-AL position-alpha) + right area (target position+uncertainty (multiple times the alpha)+alpha). About 90% of the active operation period can be used as a passive sensor acquisition period, for example, 10 active non-coherent integration (NCI) data can be acquired for each passive data acquisition.

FIG. 15 is a diagram illustrating a filter bank of a radiometer reception path of a search apparatus using an RF sensor and a radiometer sensor simultaneously according to another embodiment of the present invention.

The total system bandwidth consists of N filter banks. In the case of the time division technique described, a filter of all filter banks is operated to use almost all of the system bandwidth of the active/passive sensors, and the search device may operate only some filters of the filter bank for frequency-based division.

FIG. 16 is a diagram illustrating an operation in which a search device using an RF sensor and a radiometer sensor according to another embodiment of the present invention divides a passive signal frequency using a filter bank.

According to the frequency isolation method using the described filter bank, the bandwidth to be used by the RF sensor is set in consideration of the target maximum Doppler frequency and the RF output is transmitted. The input received signal is separated using a divider, and the filter bank is operated after excluding the filter corresponding to the bandwidth used by the RF sensor, and then combined and output. Active signals use their outputs without passive signal cancellation. The reason is that the radiometer is a system that measures the natural radiation energy of the noise level, and the active received signal is hardly affected.

17 is a diagram illustrating a bandwidth of an adaptive filter bank of a search apparatus using an RF sensor and a radiometer sensor at the same time according to another embodiment of the present invention.

If the frequency agile (transient) function of the RF sensor for electronic warfare is performed or the frequency use of the RF sensor is relatively narrow, a frequency division method using an adaptive filter bank can be used.

The RF sensor transmits the frequency domain to be used for transmission to the filter bank control unit, and turns off only the filter corresponding to that area in the reception section. The number of filter banks and each bandwidth are composed of the shape of the waveform used by the RF sensor or the frequency allocation area.

18 to 21 are block diagrams illustrating filter banks of a search device using an RF sensor and a radiometer sensor simultaneously according to embodiments of the present invention.

The path of the radiometer signal can be embodied in four main structures considering the purpose of the system, specifications, and sizes. Depending on the type of filter and the position of the switch in the filter bank, the configuration may be another configuration, and the structure is not limited in the present invention.

Referring to FIG. 18, a filter bank is configured using a switch, N filters, and a switch. It is a structure that isolates the radiometer signal and the RF signal by selecting the filter path that can suppress the most expected RF signal. The advantage of this structure is that when the RF signal is agile within the system band, it is possible to significantly suppress the RF signal on the radiometer path by selecting a filter as the frequency changes. However, the bandwidth of the radiometer may be limited according to the filter bandwidth of the filter bank.

Referring to FIG. 19, a filter bank is configured using a divider/combiner, a switch, and a filter in a structure that overcomes the aforementioned disadvantages. This is a method to isolate the signal by turning off the filter path switch of the expected RF signal.

Referring to FIG. 20, the configuration of the filter bank divides the input frequency into N pieces using a multiplexer and selects a frequency using a switch. Finally, it consists of a structure that combines divided frequencies using a combiner. The positions of the multiplexer and coupler can be changed.

Referring to FIG. 21, a structure using a multiplexer instead of the coupler of FIG. 20 is used. In the structures of FIG. 20 and FIG. 21, when operating in a single radiometer mode without using an RF sensor, all switches are turned ON to use almost all of the system bandwidth.

22 is a diagram illustrating an operation of frequency separating a search device using an RF sensor and a radiometer sensor at the same time using a filter bank according to another embodiment of the present invention. This is related to the filter bank inside the passive receiver.

The band can be selected by using multiple band-pass filters and switches in the band required by the system. A number of band-pass filters consist of filters passing through the entire band of the system and filters with various bands capable of suppressing the RF sensor signal. Conventionally, the RF sensor signal and the radiometer signal are separated using a duplexer or two filters, whereas the structure proposed in the present invention can be implemented to be able to cope with multiple frequencies when the frequency agile of the RF sensor is performed.

When the active signal is agile in the system band using the filter bank, it has a function of suppressing according to the frequency of the RF sensor signal (radar signal). If only the manual mode (radiometer sensor) is operated, the temperature sensitivity can be further increased by using the filter path using the entire band.

23 is a diagram illustrating an operation in which a search device using an RF sensor and a radiometer sensor according to another embodiment of the present invention divides the frequency of a passive signal using a filter bank. This is related to the filter bank inside the passive receiver.

This is a structure using a multiplexer different from the structure using the filter bank of FIG. 22. It is a structure that suppresses the switch of the filter path through which the RF sensor signal (radar signal) passes by using multiplexers with N bands. For example, when an RF sensor signal enters the second filter band, the signal connected to the second filter is turned off to isolate the signal. The advantage of this structure is that the band used in the system can be almost utilized, thereby increasing the temperature sensitivity of the passive sensor.

The RF sensor and radiometer sensor can be operated at the same time, and each sensor can fully use a given system bandwidth. The RF sensor performs frequency agile in a wide area to improve the ability to respond to electronic warfare. High resolution distance resolution can be realized by using frequency modulation (FM) technique using a wide bandwidth. The radiometer sensor (time division method) receives a relatively wide bandwidth than the conventional frequency division technique to improve the temperature resolution. (Frequency division method) In the existing frequency division technique, the RF sensor signal was isolated using one filter, but in the present invention, the filter sensor, the filter, and the multiplexer are used without affecting the RF sensor signal. Radiometer signal (passive signal) in a wider band (even if it is agile).

It is a complex sensor system that uses a single antenna and uses an RF sensor and a radio meter together. It can effectively use the limited system bandwidth to maximize the performance of the radio meter and the RF sensor. It is based on the operation of the pulse type RF sensor and can be used as a radiometer acquisition section in other sections based on the estimated distance.

Components included in the guided weapon, the navigation device, and the passive sensor are separately illustrated in FIG. 1, but the plurality of components may be combined with each other and implemented as at least one module. The components are connected to a communication path connecting a software module or a hardware module inside the device to operate organically with each other. These components communicate using one or more communication buses or signal lines.

Guided weapons, navigation devices, and passive complex sensors can be implemented in logic circuits by hardware, firmware, software, or a combination thereof, or can be implemented using a general purpose or special purpose computer. The device may be implemented using a fixed-wired device, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or the like. In addition, the device may be implemented as a System on Chip (SoC) including one or more processors and controllers.

Guided weapons, navigation devices, and passive complex sensors may be mounted on a computing device equipped with hardware elements in software, hardware, or a combination thereof. Computing devices include various devices or communication devices such as communication modems for performing communication with wired/wireless communication networks, memory for storing data for executing programs, and microprocessors for executing and calculating and executing programs. It can mean a device.

The search method may be performed by a computing device, and detailed descriptions of operations performed by the search apparatus and overlapping descriptions will be omitted.

Although FIG. 13 describes that each process is executed sequentially, this is merely illustrative, and a person skilled in the art changes and executes the sequence described in FIG. 13 without departing from the essential characteristics of the embodiments of the present invention. Or, it may be applied by various modifications and variations by executing one or more processes in parallel or adding other processes.

The operation according to the present embodiments may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. Computer readable media refers to any media that participates in providing instructions to a processor for execution. Computer-readable media may include program instructions, data files, data structures, or combinations thereof. For example, there may be a magnetic medium, an optical recording medium, a memory, and the like. The computer program may be distributed over a networked computer system to store and execute computer readable code in a distributed manner. Functional programs, codes, and code segments for implementing the present embodiment can be easily inferred by programmers in the technical field to which this embodiment belongs.

The present embodiments are for explaining the technical spirit of the present embodiment, and the scope of the technical spirit of the present embodiment is not limited by these embodiments. The protection scope of the present embodiment should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present embodiment.

Claims (12)

In a multi-sensor complex sensor operating in a frequency division method,
A millimeter wave receiver for transmitting radio frequency signals and radio meter signals received from the antenna in a common path; And
And an intermediate frequency receiver for distributing the received radio frequency signal and the received radio meter signal into active and passive signals according to the first path and the second path through a distributor connected to the common path,
The intermediate frequency receiver includes an active receiver for amplifying and converting the distributed active signal and a passive receiver for amplifying and converting the distributed passive signal,
The passive receiver applies a filter bank separating a plurality of frequency bands to the distributed passive signal,
The passive receiver uses the remaining frequency bands used for the radiometer signal among the entire frequency bands of the passive composite sensor by turning off a switch corresponding to a frequency band used for the radio frequency signal among the filter banks,
The active receiver is an active passive sensor, characterized in that using the entire frequency band of the active passive sensor. According to claim 1,
The millimeter wave receiving unit,
A frequency converter for amplifying and synthesizing radio frequency signals and radio meter signals received from the antenna; And
And a calibration source for correcting the received radiometer signal. delete delete According to claim 1,
The filter bank,
A shear switch connected to the distributor to select connection or disconnection of a signal path;
A plurality of frequency filters connected in parallel to the front end switch; And
And a rear end switch connected to the plurality of frequency filters to select connection or disconnection of a signal path. According to claim 1,
The filter bank,
A shear coupler connected to the distributor to mix signals;
A plurality of switches connected in parallel to the shear coupler;
A plurality of frequency filters respectively connected to the plurality of switches; And
It is connected to the plurality of frequency filters, characterized in that it comprises a passive coupler for mixing the signal, a passive sensor. According to claim 1,
The filter bank,
A multiplexer connected to the distributor to select a signal;
A plurality of switches connected in parallel to the multiplexer; And
It is connected to the plurality of switches characterized in that it comprises a combiner for mixing the signal passive composite sensor. According to claim 1,
The filter bank,
A shear multiplexer connected to the distributor to select a signal;
A plurality of switches connected in parallel to the front end multiplexer; And
And a rear-end multiplexer connected to the plurality of switches to select a signal. According to claim 1,
The filter bank,
A multi-sensor complex sensor, characterized in that a frequency band allocated to the radio frequency signal is set based on a maximum Doppler frequency of the target. The method of claim 9,
The active receiver processes the active signal as it is,
The passive receiver removes a frequency band corresponding to the radio frequency signal from the passive signal. According to claim 1,
When frequency aggregation is performed on the radio frequency signal or the frequency of the radio frequency signal is narrow band, a part of frequencies corresponding to the frequency band corresponding to the radio frequency signal among a plurality of frequency bands belonging to the filter bank A passive sensor comprising a filter bank control unit for deactivating the band. The method of claim 11,
The number and bandwidth of a plurality of frequency bands belonging to the filter bank are set based on the shape of the waveform of the radio frequency signal or the frequency allocation area.

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