KR100964338B1 - Transmitter signal rejection equipment in radar receiver - Google Patents

Transmitter signal rejection equipment in radar receiver Download PDF

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Publication number
KR100964338B1
KR100964338B1 KR1020100006477A KR20100006477A KR100964338B1 KR 100964338 B1 KR100964338 B1 KR 100964338B1 KR 1020100006477 A KR1020100006477 A KR 1020100006477A KR 20100006477 A KR20100006477 A KR 20100006477A KR 100964338 B1 KR100964338 B1 KR 100964338B1
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KR
South Korea
Prior art keywords
transmission signal
port
signal
local oscillation
hybrid coupler
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KR1020100006477A
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Korean (ko)
Inventor
이만규
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삼성탈레스 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/35—Details of non-pulse systems
    • G01S7/352—Receivers
    • G01S7/354—Extracting wanted echo-signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference

Abstract

PURPOSE: A transmission signal removal apparatus of a radar receiver is provided to obtain excellent noise index property by minimizing the magnitude of a transmission signal received by a local oscillating signal. CONSTITUTION: A hybrid coupler(21) comprises first through fourth ports(2a, 2b, 2c, 2d). First and second high frequency pass filters(22, 23) are connected to the hybrid coupler and passes only high frequency signal corresponding to the transmission signal. Terminators(24, 25) for removing the first and second transmission signal remove the transmission signal. The first port is connected to the input terminal(11-2). The second port is connected to the output terminal(12-2). The third port is connected to one end of the filter for passing the first high frequency.

Description

Transmission signal cancellation device of radar receiver {TRANSMITTER SIGNAL REJECTION EQUIPMENT IN RADAR RECEIVER}

The present invention relates to an apparatus for removing a transmission signal of a radar receiver, and more particularly, to an apparatus for removing a transmission signal flowing into a reception channel in a high frequency transceiver of a radar using a local oscillation method.

In general, radar (RADAR) is a sensing device that emits electromagnetic waves in a transmission channel and receives reflected waves reflected by a detector in a reception channel to detect the presence of the detector and its distance. The radar may be classified into a pulse radar, a Doppler pulse radar, a moving target indicator (MTI), a continuous wave (CW) radar, and the like according to its function. Among them, the pulse radar transmits a radio energy pulse and detects a reflected wave from the detector. The pulse radar determines a target direction in the detection direction of the antenna and calculates a distance based on the arrival time of the pulse. In addition, a Doppler pulse radar is a method of calculating a velocity in a radial direction by using a difference between a frequency of a transmission pulse and a frequency reflected from a detector by the Doppler effect.

When the transmitting and receiving antennas are separately used in these radar devices, the reception sensitivity is excellent because of the excellent isolation of the transmitting channel and the receiving channel, but the two radar devices must be provided. The problem is that the overall volume increases.

However, if the transmitting and receiving antennas are implemented as one antenna, the overall volume of the radar device can be reduced, but there is a problem that the isolation between the transmitted signal and the received signal and the level of the received signal are degraded. That is, a signal separation element (circulator, isolator or divider, etc.) and a plurality of band pass filters are used to separate the transmission signal from the reception signal. Since the isolation of the received signal is very low, the signal from the transmission channel flows into the reception channel, reducing the reception sensitivity of the radar device, making it difficult to detect weak reception signals, and deteriorating the noise figure of the reception channel. A problem arises.

1 is a block diagram showing an apparatus for removing a transmission signal flowing into a reception channel in a conventional radar.

As shown in FIG. 1, in the conventional radar, a circulator 13, a terminator 14, and a bandpass filter 15 and 17 are used to remove a transmission signal flowing into a reception channel. ), Isolator 16 is included. Techniques for separating transmission and reception signals using the circulator 13 to remove transmission signals are described in Korean Patent Laid-Open No. 2001-48126.

Referring to the apparatus illustrated in FIG. 1, when the transmission signal f0 leaked from the transmitter and the local oscillation signal fh1 received at the receiver are input to the input terminal 11-1 of the transmission signal removing apparatus, The signals f0 and fh1 are transmitted by the circulator 13 from the first port 1a to the second port 1b. Thereafter, the two signals f0 and fh1 reach the first band pass filter 15 for passing the high power local oscillation signal, and the local oscillation signal fh1 passes through the filter, but most of the leaked transmission signal f0 is zero. Reflected without passing through the first band pass filter 15, the circulator 13 is transmitted from the second port 1b to the third port 1c. The leaked transmission signal f0 transmitted to the third port 1c is removed by the terminator 14 for the high frequency signal. Meanwhile, the local oscillation signal fh1 passing through the first band pass filter 15 passes through the isolator 16 and the second band pass filter 17 for passing the high power local oscillation signal to a signal processor (not shown). do. In addition, a part of the leaked transmission signal f0 that has passed through the first bandpass filter 15 reaches the second bandpass filter 17 via the isolator 16, and a part of the leaked transmission signal f0 is lost. Is passed through the second band pass filter 17 and transmitted to the signal processor via the output terminal 12-1.

However, in the prior art, there is a limit in removing the transmitted signal f0 leaked from the high power local oscillation signal pass band pass filters 15 and 17 to a necessary level, and also by local losses of the filters 15 and 17. As the level of the oscillation signal fh1 is lowered and an additional high frequency amplifier is required, the noise index characteristic of the receiver is degraded.

An object of the present invention for solving the above problems is to prevent the degradation of the local oscillation signal required for the receiver in the Doppler radar apparatus applying the local oscillation method and to remove the transmission signal of the radar receiver to minimize the size of the transmission signal In providing.

According to a first embodiment of the present invention, a first port for inputting a local oscillation signal and a transmission signal, a second port for outputting the local oscillation signal, the local oscillation signal and the transmission signal inputted to the first port A hybrid coupler including a third port for outputting and a fourth port for converting and outputting the local oscillation signal and the transmission signal to have a phase difference of 90 degrees with the local oscillation signal and the transmission signal output through the third port, the A first high-frequency pass filter connected to a third port and configured to pass the transmission signal output from the third port and reflect the local oscillation signal output from the third port; A second high frequency pass for passing the transmission signal output from the fourth port and reflecting the local oscillation signal output from the fourth port; A first transmission signal removal terminator for removing the transmission signal passing through the first high frequency pass filter, and a second high frequency pass filter; And a second transmission signal removal terminator for removing the transmission signal passing through the second high pass filter, wherein the local oscillation signal output to the second port includes the first high pass filter and the second transmission signal. It is characterized in that the local oscillation signal reflected by the high-pass filter.

In addition, according to a second embodiment of the present invention, the apparatus includes first and second transmission signal cancellation devices having the same configuration as the transmission signal removal device of the radar receiver, and the second port of the first transmission signal removal device. The first port of the second transmission signal removal device is connected, the local oscillation signal and the transmission signal are input to the first port of the first transmission signal removal device, and the input transmission signal is inputted to the first and second transmission signals. The local oscillation signal, which is removed by the second transmission signal removing device, is output to the second port of the second transmission signal removing device.

Furthermore, according to the third embodiment of the present invention, a local oscillation is connected between the second port of the first transmission signal canceller and the first port of the second transmission signal canceller so as not to pass the transmission signal. It further comprises a band pass filter for signal passing.

According to the present invention, in the Doppler radar device applying the local oscillation method, the level reduction of the local oscillation signal generated by the internal loss of the filter is minimized so that a separate amplifier is unnecessary, and the magnitude of the transmission signal introduced into the local oscillation signal is minimized. By minimizing the cost reduction, there is an effect having excellent noise figure characteristics.

1 is a transmission signal removing apparatus of a radar receiver according to the prior art,
2 is a transmission signal removing apparatus of a radar receiver according to a first embodiment of the present invention;
3 is a transmission signal removing apparatus of a radar receiver according to a second embodiment of the present invention;
4 is a transmission signal removing apparatus of a radar receiver according to a third embodiment of the present invention.

In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

In a typical Doppler radar system, the following steps are used to obtain information about a detector. First, a transmission signal is loaded on a local oscillation signal which is a carrier wave and radiated through an antenna. The emitted signal is reflected by the detector, whereby the reflected signal is shifted by the Doppler frequency relative to the emitted signal by the moving speed of the detector. A frequency shifted reflected signal may be received by the antenna of the radar system, and position or velocity information of the detector may be obtained from the received reflected signal.

2 is a block diagram of an apparatus for removing a transmission signal of a radar receiver according to a first embodiment of the present invention.

As shown in FIG. 2, the apparatus for removing a transmission signal of the radar receiver according to the first embodiment of the present invention includes a hybrid coupler 21 having four ports 2a, 2b, 2c, and 2d. Two high-frequency pass filters 22 and 23 connected to the hybrid coupler 21 to pass only the high-frequency signal, which is the transmission signal f0, and two transmission signal removal terminators for removing the transmission signal f0. 24, 25, terminator).

Looking at the configuration of the first embodiment according to the present invention.

The hybrid coupler 21 has four ports 2a, 2b, 2c and 2d, of which the first port 2a is connected to the input terminal 11-2, and the second The port 2b is connected to the output terminal 12-2. The third port 2c is connected to one end of the first high pass filter 22 of the two high pass filters, and the fourth port 2d is connected to one end of the second high pass filter 23. It is connected. In addition, the other end of the first high-frequency pass filter 22 is connected to one end of the first transmission signal removing terminator 24, and the other end of the second high-frequency pass filter 23 is for removing the second transmission signal. It is connected to one end of the termination device 25. The other ends of the terminating devices 24 and 25 for removing the first and second transmission signals are grounded.

In addition, the schematic operation of the hybrid coupler 21 will be described.

The hybrid coupler 21 has a function of partially extracting a specific signal power and a function of distributing one signal power to two or more specific signal powers. Specifically, when a signal is input to the first port 2a, the signal is divided in half and output to the third and fourth ports 2c and 2d, and not to the second port 2b. The signals output from the third and fourth ports 2c and 2d are output with a phase difference of 90 degrees. On the contrary, when a signal having a phase difference of 90 degrees is input to the third and fourth ports 2c and 2d, the signals are synthesized and output to the first port 2a or the second port 2b.

In more detail, when the phase of the signal input to the third port 2c is 90 degrees and the phase of the signal input to the fourth port 2d is 180 degrees, the two signals are synthesized and output to the first port 2a. And is not output to the second port 2b. On the contrary, when the phase of the signal input to the third port 2c is 180 degrees and the phase of the signal input to the fourth port 2d is 90 degrees, the two signals are synthesized and output to the second port 2b. It is not output to the 1 port 2a.

In addition, the terminating device for removing the transmission signal (24, 25) may be made of a ferrite material, and has a variety of design reference impedance, when the reference impedance is close to a specific resistance value, the reflection phenomenon of a specific signal Prevent and terminate.

The operation of the apparatus for removing the transmission signal of the radar receiver will be described below.

The local oscillation signal fh1 and the transmission signal f0 are mixed with the first port 2a of the four ports of the hybrid coupler 21, which is an input terminal 11-2 of the transmission signal removing apparatus of the radar receiver. Is entered. The local oscillation signal fh1 and the transmission signal f0 input to the first port 2a are divided into two signals having the same magnitude and 90 degrees out of phase, respectively, so that the third port 2c and the fourth port are separated. It outputs to 2d and is not output to the 2nd port 2b. Of the mixed signals output to the third port 2c, the local oscillation signal fh1 does not pass through the first high frequency filter 22 and is reflected, and is input to the third port 2c. Of the mixed signals output to the fourth port 2d, the local oscillation signal fh1 is reflected without passing through the second high-frequency pass filter 23 and is input to the fourth port 2d. The local oscillation signal fh1 input to the third port 2c and the fourth port 2d is synthesized and output to the second port 2b by the phase difference, and is not output to the first port 2a. .

On the other hand, the transmission signal f0 output from the third port 2c passes through the first high frequency pass filter 22 connected to the third port 2c, and the transmission output from the fourth port 2d. The signal f0 passes through a second high pass filter 23 connected to the fourth port 2d. The transmission signal f0 passing through the first high pass filter 22 is attenuated and removed from the first transmission signal removing terminator 24 connected to the first high pass filter 22. In addition, the transmission signal f0 passing through the second high pass filter 23 is attenuated and removed by the second transmission signal removal terminator 25 connected to the second high pass filter 23. .

That is, among the local oscillation signal fh1 and the transmission signal f0 inputted to the first port 2a of the hybrid coupler 21, the transmission signal f0 is terminated for removing the first and second transmission signals. Attenuated and removed through the devices 24 and 25, the local oscillation signal fh1 is output to the output terminal 12-2, which is the second port 2b of the hybrid coupler 21 without attenuation.

3 is a block diagram of an apparatus for removing a transmission signal in a receiver according to a second embodiment of the present invention.

As shown in FIG. 3, the apparatus for removing transmission signals of the radar receiver according to the second embodiment of the present invention includes two apparatuses for canceling transmission signals of the radar receiver according to the first embodiment. That is, the transmission signal removing device of the radar receiver includes a first transmission signal removing device 30a and a second transmission signal removing device 30b, and the first transmission signal removing device 30a and the second transmission signal removing device. 30b each contains one hybrid coupler 31-1, 31-2, two high pass filters (32-1, 33-1 and 32-2, 33-2) and two transmissions Signal cancellation terminations (34-1, 35-1) and (34-2, 35-2).

Referring to the configuration of the apparatus for removing the transmission signal of the radar receiver according to the second embodiment of the present invention.

For convenience, the hybrid coupler included in the first transmission signal remover 30a is called the first hybrid coupler 31-1, and the hybrid coupler included in the second transmission signal remover 30b is called the second hybrid coupler 31. It is called -2). The hybrid couplers 31-1 and 31-2 have four ports (3a, 3b, 3c, 3d) and (3e, 3f, 3g, 3h), respectively. The first port 3a of the four ports of the first hybrid coupler 31-1 is connected to the input terminal 11-3 and the second port of the four ports of the second hybrid coupler 31-2. 3f is connected to the output terminal 12-3. In addition, the second port 3b of the first hybrid coupler 31-1 and the first port 3e of the second hybrid coupler 31-2 are connected.

Meanwhile, the third port 3c of the first hybrid coupler 31-1 is connected to one end of the first high-frequency pass filter 32-1 of the first transmission signal removing device 30a, and the first hybrid The fourth port 3d of the coupler 31-1 is connected to one end of the second high-frequency pass filter 33-1 of the first transmission signal removing device 30a. The other end of the first high-frequency pass filter 32-1 of the first transmission signal removal device 30a is connected to the first transmission signal removal termination device 34-1 of the first transmission signal removal device 30a. The other end of the second high-frequency pass filter 33-1 of the first transmission signal removal device 30a is connected to the second transmission signal removal termination device 35-1 of the first transmission signal removal device 30a. It is connected. The other ends of the first and second transmission signal removing terminators 34-1 and 35-1 are grounded.

In addition, the third port 3g of the second hybrid coupler 31-2 is connected to one end of the first high pass filter 32-2 of the second transmission signal removing device 30b, and the second hybrid The fourth port 3h of the coupler 31-2 is connected to one end of the second high-frequency pass filter 33-2 of the second transmission signal removing device 30b. The other end of the first high frequency filter 32-2 of the second transmission signal removal device 30b is connected to the first transmission signal removal termination device 34-2 of the second transmission signal removal device 30b. The other end of the second high frequency pass filter 33-2 of the second transmission signal removal device 30b is connected to the second transmission signal removal termination device 35-2 of the second transmission signal removal device 30b. It is connected. The other ends of the first and second transmission signal removing terminators 34-2 and 35-2 are grounded.

The operation of the apparatus for removing the transmission signal of the radar receiver according to the second embodiment of the present invention is as follows.

The local oscillation signal fh1 and the transmission signal f0 are mixed and input to the first port 3a of the first hybrid coupler 31-1, which is an input terminal 11-3 of the transmission signal removing apparatus of the radar receiver. . The local oscillation signal fh1 and the transmission signal f0 input to the first port 3a of the first hybrid coupler 31-1 are divided into two signals having the same magnitude and 90 degrees out of phase. It is output to the 3rd port 3c and the 4th port 3d of the 1st hybrid coupler 31-1, and is not output to the 2nd port 3b.

Of the mixed signals output to the third port 3c of the first hybrid coupler 31-1, the local oscillation signal fh1 is connected to the third port 3c of the first hybrid coupler 31-1. The light is not passed through the first high pass filter 32-1 connected thereto and is reflected to the third port 3c of the first hybrid coupler 31-1. Further, of the mixed signals output to the fourth port 3d of the first hybrid coupler 31-1, the local oscillation signal fh1 is the fourth port 3d of the first hybrid coupler 31-1. It is reflected without passing through the second high pass filter 33-1 connected to), and is input to the fourth port 3d of the first hybrid coupler 31-1.

The local oscillation signal fh1 inputted to the third port 3c and the fourth port 3d of the first hybrid coupler 31-1 is the second of the first hybrid coupler 31-1 due to the phase difference. It is synthesized and output to the port 3b, and is not output to the first port 3a of the first hybrid coupler 31-1.

Meanwhile, of the mixed signals output from the third port 3c of the first hybrid coupler 31-1, the transmission signal f0 is the third port 3c of the first hybrid coupler 31-1. It passes through the 1st high frequency filter 32-1 connected to. The transmission signal f0 passing through the first high frequency filter 32-1 is attenuated and removed while passing through the first transmission signal removal terminator 34-1. The first hybrid coupler 31-1 may not pass through the first high frequency filter 32-1, or may be attenuated by the first transmission signal removal terminator 34-1. Is input to the third port 3c.

Further, of the mixed signals output from the fourth port 3d of the first hybrid coupler 31-1, the transmission signal f0 is the fourth port 3d of the first hybrid coupler 31-1. It passes through the 2nd high frequency filter 33-1 connected to. The transmission signal f0 passing through the second high frequency filter 33-1 is attenuated and removed while passing through the second transmission signal removal terminator 35-1. The transmission signal f0 that does not pass through the second high-frequency filter 33-1 or that is not attenuated by the second transmission signal removal terminator 35-1 is the first hybrid coupler 31-1. 4th port 3d).

The transmission signal f0 input to the third port 3c and the fourth port 3d of the first hybrid coupler 31-1 is similar to the local oscillation signal fh1. Is synthesized and outputted to the second port 3b of the ss, and is not output to the first port 3a of the first hybrid coupler 31-1.

The local oscillation signal fh1 and the transmission signal f0 outputted to the second port 3b of the first hybrid coupler 31-1 are connected to the second port 3b of the first hybrid coupler 31-1. Input to the first port (3e) of the second hybrid coupler (31-2) connected to the, and is input to the second transmission signal removing device (30b). The second transmission signal removing device 30b, in which the local oscillation signal fh1 and the transmission signal f0 are input from the first transmission signal removing device 30a, is operated according to the operation method of the first transmission signal removing device 30a. It works the same.

That is, the local oscillation signal fh1 input to the first port 3e of the second hybrid coupler 31-2 is connected to the third port 3g and the fourth port (3g) of the second hybrid coupler 31-2. 3h) after being output to 3h), the second and second high frequency pass filters 32-2 and 33-2 included in the second transmission signal removing device 30b do not pass and are reflected, and the second hybrid coupler ( It is input to the third port 3g and the fourth port 3h of 31-2, and is output to the output terminal 12-3 through the second port 3f of the second hybrid coupler 31-2. The transmission signal f0 input to the first port 3e of the second hybrid coupler 31-2 is connected to the third port 3g and the fourth port 3h of the second hybrid coupler 31-2. ) And then the first and second high pass filters 32-2 and 33-2 included in the second transmission signal removing device 30b to pass through the high pass filters 32-2 and 33. And attenuated by the first and second transmission signal removal terminators 34-2 and 35-2 connected to the negative signal -2).

4 is a block diagram of an apparatus for removing a transmission signal of a radar receiver according to a third embodiment of the present invention.

As shown in FIG. 4, the apparatus for removing a transmission signal of the radar receiver according to the third embodiment of the present invention is for passing the apparatus for removing the transmission signal of the radar receiver and one local oscillation signal fh1 according to the second embodiment. And a bandpass filter 46. That is, the transmission signal removing device of the radar receiver includes a first transmission signal removing device 40a, a second transmission signal removing device 40b, and a band pass filter 46 for passing the local oscillation signal fh1. Each of the first transmission signal canceller 40a and the second transmission signal canceller 40b includes one hybrid coupler 41-1 and 41-2 and two high frequency pass filters 42-1 and 43-1. And (42-2, 43-2)) and two transmission signal cancellation terminators (44-1, 45-1) and (44-2, 45-2).

Referring to the configuration of the transmission signal cancellation apparatus of the radar receiver according to the third embodiment of the present invention.

For convenience, the hybrid coupler included in the first transmission signal removing device 40a is called the first hybrid coupler 41-1, and the hybrid coupler included in the second transmission signal removing device 40b is called the second hybrid coupler 41. It is called -2). The hybrid couplers 41-1 and 41-2 each have four ports (4a, 4b, 4c, 4d) and (4e, 4f, 4g, 4h). The first port 4a of the four ports of the first hybrid coupler 41-1 is connected to the input terminal 11-4, and the second port of the four ports of the second hybrid coupler 41-2. 4f is connected to the output terminal 12-4. In addition, the second port 4b of the first hybrid coupler 41-1 is connected to one end of the bandpass filter 46, and the other end of the bandpass filter 46 is connected to the second hybrid coupler 41-. It is connected with the 1st port 4e of 2).

Meanwhile, the third port 4c of the first hybrid coupler 41-1 is connected to one end of the first high-frequency pass filter 42-1 of the first transmission signal removing device 40a, and the first hybrid The fourth port 4d of the coupler 41-1 is connected to one end of the second high pass filter 43-1 of the first transmission signal removing device 40a. The other end of the first high frequency pass filter 42-1 of the first transmission signal removal device 40a is connected to the first transmission signal removal end device 44-1 of the first transmission signal removal device 40a. The other end of the second high-frequency pass filter 43-1 of the first transmission signal removal device 40a is connected to the second transmission signal removal termination device 45-1 of the first transmission signal removal device 40a. It is connected. The other ends of the first and second transmission signal removing terminators 44-1 and 45-1 are grounded.

In addition, the third port 4g of the second hybrid coupler 41-2 is connected to one end of the first high pass filter 42-2 of the second transmission signal removing device 40b, and the second hybrid The fourth port 4h of the coupler 41-2 is connected to one end of the second high pass filter 43-2 of the second transmission signal removing device 40b. The other end of the first high-frequency pass filter 42-2 of the second transmission signal removal device 40b is connected to the first transmission signal removal end device 44-2 of the second transmission signal removal device 40b. The other end of the second high-frequency pass filter 43-2 of the second transmission signal removal device 40b is connected to the second transmission signal removal termination device 45-2 of the second transmission signal removal device 40b. It is connected. The other ends of the first and second transmission signal removing terminators 44-2 and 45-2 are grounded.

The operation of the apparatus for removing the transmission signal of the radar receiver according to the third embodiment of the present invention is as follows.

The local oscillation signal fh1 and the transmission signal f0 are mixed and input to the first port 4a of the first hybrid coupler 41-1, which is an input terminal 11-4 of the transmission signal removing apparatus of the radar receiver. . The local oscillation signal fh1 and the transmission signal f0 input to the first port 4a of the first hybrid coupler 41-1 are divided into two signals having the same magnitude and 90 degrees out of phase. It is output to the 3rd port 4c and the 4th port 4d of the 1st hybrid coupler 41-1, and is not output to the 2nd port 4b.

Of the mixed signals output to the third port 4c of the first hybrid coupler 41-1, the local oscillation signal fh1 is connected to the third port 4c of the first hybrid coupler 41-1. The light is not passed through the first high frequency filter 42-1 connected thereto, and is reflected to the third port 4c of the first hybrid coupler 41-1. Further, of the mixed signals output to the fourth port 4d of the first hybrid coupler 41-1, the local oscillation signal fh1 is the fourth port 4d of the first hybrid coupler 41-1. The second high frequency filter 43-1, which is connected to the second high pass filter 43-1, is not reflected and is input to the fourth port 4d of the first hybrid coupler 41-1.

The local oscillation signal fh1 inputted to the third port 4c and the fourth port 4d of the first hybrid coupler 41-1 is the second of the first hybrid coupler 41-1 due to the phase difference. It is synthesized and output to the port 4b, and is not output to the first port 4a of the first hybrid coupler 41-1.

On the other hand, of the mixed signals output from the third port 4c of the first hybrid coupler 41-1, the transmission signal f0 is the third port 4c of the first hybrid coupler 41-1. It passes through the 1st high frequency filter 42-1 connected to. The transmission signal f0 passing through the first high frequency filter 42-1 is attenuated and removed while passing through the first transmission signal removal terminator 44-1. The first hybrid coupler 41-1 may not pass through the first high-frequency pass filter 42-1 or the attenuated transmission signal f0 may be unattenuated by the first transmission signal removal terminator 44-1. Is input to the third port 4c.

Further, of the mixed signals output from the fourth port 4d of the first hybrid coupler 41-1, the transmission signal f0 is the fourth port 4d of the first hybrid coupler 41-1. Passes through the second high-pass filter (43-1) connected to. The transmission signal f0 passing through the second high frequency filter 43-1 is attenuated and removed while passing through the second transmission signal removal terminator 45-1. The first hybrid coupler 41-1 does not pass through the second high-pass filter 43-1 or the attenuated transmission signal f0 is not attenuated by the second transmission signal removal terminator 45-1. Is input to the fourth port 4d.

The transmission signal f0 input to the third port 4c and the fourth port 4d of the first hybrid coupler 41-1 is the same as the local oscillation signal fh1. Is synthesized and outputted to the second port 4b of the NPC, and is not output to the first port 4a of the first hybrid coupler 41-1.

The local oscillation signal fh1 output from the second port 4b of the first hybrid coupler 41-1 passes through the band pass filter 46 without attenuation, and thus the second hybrid coupler 41-2 of the second hybrid coupler 41-2. It is input to the first port 4e. However, the transmission signal f0 output to the second port 4b of the first hybrid coupler 41-1 is attenuated by a considerable ratio while passing through the bandpass filter 46, and the bandpass filter 46 The transmission signal passing through is input to the first port 4e of the second hybrid coupler 41-2.

The local oscillation signal fh1 and the transmission signal f0 input to the first port 4e of the second hybrid coupler 41-2 are input to the second transmission signal removal device 40b. The second transmission signal removal device 40b to which the local oscillation signal fh1 and the transmission signal f0 are input operates in the same manner as that of the first transmission signal removal device 40a.

That is, the local oscillation signal fh1 inputted to the first port 4e of the second hybrid coupler 41-2 is connected to the third port 4g and the fourth port (2g) of the second hybrid coupler 41-2. 4h) after being output to the second transmission signal removing unit 40b, the second and second high frequency pass filters 42-2 and 43-2 are reflected, not passing through the second hybrid coupler ( It is input to the third port 4g and the fourth port 4h of the 41-2, and is output to the output terminal 12-4 through the second port 4f of the second hybrid coupler 41-2. The transmission signal f0 input to the first port 4e of the second hybrid coupler 41-2 is connected to the third port 4g and the fourth port 4h of the second hybrid coupler 41-2. ), And then passes through the first and second high pass filters 42-2 and 43-2 included in the second transmission signal removing device 40b to pass the high pass filters 42-2 and 43. And attenuated by the first and second transmission signal removal terminators 44-2 and 45-2 connected to the negative signal -2).

The above embodiments may be implemented with a waveguide type transmission signal removing device. According to the apparatus for removing the transmission signal of the radar receiver according to the embodiments, since it is not necessary to use a plurality of band pass filters, the level of the local oscillation signal required for the receiver is not unnecessarily reduced. Therefore, since an additional high frequency amplifier for increasing the level of the local oscillation signal is unnecessary, the noise figure characteristic of the receiver is improved and the effect of cost reduction occurs. In addition, the transmission signal introduced into the local oscillation signal can be attenuated as effectively as possible by the hybrid coupler, the high frequency pass filter, and the front end of the transmission signal removal.

On the other hand, while the specific embodiments of the present invention have been described, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

Claims (3)

A first port to which a local oscillation signal and a transmission signal are input;
A second port for outputting the local oscillation signal,
A third port for outputting the local oscillation signal and the transmission signal input to the first port;
A hybrid coupler including a fourth port for converting and outputting the local oscillation signal and the transmission signal to have a phase difference of 90 degrees with the local oscillation signal and the transmission signal output to a third port;
A first high frequency pass filter connected to the third port and configured to pass the transmission signal output from the third port and reflect the local oscillation signal output from the third port;
A second high frequency pass filter connected to the fourth port and configured to pass the transmission signal output from the fourth port and reflect the local oscillation signal output from the fourth port;
A terminating device for removing a first transmission signal connected to the first high frequency filter and removing the transmission signal passing through the first high frequency filter; And
A second transmission signal removal terminator connected to the second high pass filter and removing the transmission signal passing through the second high pass filter, wherein the local oscillation signal is output to the second port; Is a local oscillation signal reflected by the first high pass filter and the second high pass filter.
The method of claim 1,
A first and second transmission signal canceller having the same configuration as the transmission signal canceller of the radar receiver, wherein the second port of the first transmission signal canceller and the first port of the second transmission signal canceller Is connected, the local oscillation signal and the transmission signal are input to a first port of the first transmission signal removal device, and the input transmission signal is removed by the first and second transmission signal removal devices, and The local oscillation signal is output to the second port of the second transmission signal removal device.
The method of claim 2,
And a band pass filter for passing a local oscillation signal connected between the second port of the first transmission signal removing device and the first port of the second transmission signal removing device to prevent the transmission of the transmission signal. Transmission signal removal device of the radar receiver.
KR1020100006477A 2010-01-25 2010-01-25 Transmitter signal rejection equipment in radar receiver KR100964338B1 (en)

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KR20190119264A (en) * 2018-04-12 2019-10-22 주식회사 만도 Radar system and Transmit Apparatus therefor

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KR20190119264A (en) * 2018-04-12 2019-10-22 주식회사 만도 Radar system and Transmit Apparatus therefor
KR102093363B1 (en) * 2018-04-12 2020-03-25 주식회사 만도 Radar system and Transmit Apparatus therefor
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