KR101654252B1 - dual Tx-beam type rear and side directional RADAR - Google Patents

Abstract

The present invention relates to a rear radar of a dual transmission beam type capable of detecting a plurality of rear lateral areas (BSD, LCA, RCTA and RCW) using two transmission beams, A first transmission antenna for radiating a first transmission beam for detecting a first region corresponding to a zone detection (BSD) region, a lane change assistance (LCA) region and a rearward collision alarm (RCW) region, A second transmission antenna for emitting a second transmission beam for detecting a second area corresponding to a rear parking assist (RCTA) area excluding a first area detected by the first area, A first reception signal processor for outputting an in-phase reception channel signal and a quadrature reception channel signal from a first reception signal of the first reception antenna; The second receiving antenna of the second receiving antenna A second reception signal processor for outputting an in-phase reception channel signal and a quadrature-phase reception channel signal from the first and second reception signal processors, an AD converter for converting an output of each of the first and second reception signal processors into a digital reception signal, And a digital signal processing processor for calculating the detection information for the target using the digital signal processor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dual Tx-type rear and side directional RADAR,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular radar, and more particularly, to a double transmission beam type rear side radar capable of detecting a plurality of rear side areas (BSD, LCA, RCTA, and RCW) using two transmission beams.

In general, RADAR (Radio Detection and Ranging) is a sensor that detects the presence of a nearby object as well as the presence of a remote object.

The shape of the radar varies, and it is divided into a continuous wave radar and a pulse wave radar according to the wave form.

Continuous wave radars include Doppler radar and FMCW radar. Pulse wave radar includes Pulse Doppler Radar and Pulse Compression Radar.

Recently, the demand for high-resolution radar that detects objects within a few tens of meters using millimeter-wave or sub-millimeter-wave bandwidth has been increasing, and research is continuing. High resolution radar that can distinguish or disassemble distances between near objects is widely used for industrial and military applications, and is also used for vehicles in real life.

Vehicle radar is an essential technology for realizing intelligent transportation system. It is designed to detect the movement of other vehicles or objects moving or stopping to prevent accidents caused by bad weather condition or driver 's carelessness.

Particularly, the vehicular rear side radar uses only the main lobe and side lobe from one beam, thereby detecting only the two rear side regions LCA and BSD.

Thereby, a blind spot detection (BSD) area, a lane change assist (LCA) area, a rear cross traffic alert (hereinafter referred to as " There is a demand for a radar system capable of detecting all the rear side regions of the RCTA region and the rear crash warning region (RCW).

The present invention has been made in view of the above points, and it is an object of the present invention to provide a duplex transmission system capable of simultaneously detecting all the backside regions of BSD, LCA, RCTA and RCW regions using two transmission beams and two reception beams. Side radar of the present invention.

According to another aspect of the present invention, there is provided a dual transmit beam system rear side radar system including a rear side dead zone detection (BSD) region, a lane change assistant (LCA) region and a rearward collision warning (RCW) A first transmit antenna that radiates a first transmit beam for detecting a first region comprising a first transmit antenna and a second region that is a backward frequency auxiliary (RCTA) region excluding a first region detected by the first transmit antenna; First and second receive antennas for receiving a received signal reflected on a target of the first region or the second region and a second transmit antenna for receiving a first A first reception signal processing unit for outputting an in-phase reception channel signal and a quadrature-phase reception channel signal from a reception signal, a first reception signal processing unit for outputting an in-phase reception channel signal and a quadrature reception channel signal from a second reception signal of the second reception antenna, 2 reception signal processing section, An AD converter for converting channel-specific outputs of the first and second reception signal processing units into a digital reception signal, and a digital signal processing processor for calculating detection information on the target using the digital reception signal.

Advantageously, the first transmission antenna is configured such that the beam axis of the first transmission beam directs either the rearward dead zone detection (BSD) region, the lane change assist (LCA) region, or the rearward collision alert (RCW) .

Advantageously, the first transmission antenna may be arranged such that the beam axis of the first transmission beam directs the lane-changing assist (LCA) region.

Preferably, the first transmission antenna has an effective radiation range of an angle of -90 degrees to + 90 degrees relative to the first area, and the maximum antenna gain of the first transmission beam is less than the lane change assist (LCA) area As shown in FIG.

Advantageously, the second transmission antenna may be arranged such that the beam axis of the second transmission beam is directed to the rear parking assist (RCTA) region.

Preferably, the second transmission antenna has an effective radiation range of -90 degrees to +90 degrees relative to the second area, and the maximum antenna gain of the second transmission beam is greater than the maximum radiation gain of the rear parking assist (RCTA) area As shown in FIG.

Advantageously, the first transmission beam of the first transmission antenna and the second transmission beam of the second transmission antenna may be simultaneously emitted.

Advantageously, the first transmission beam of the first transmission antenna and the second transmission beam of the second transmission antenna may be radiated alternately in time.

Preferably, the first and second transmit antennas, the first and second receive antennas, and the first and second receive signal processing units may be provided on a single substrate.

According to another aspect of the present invention, there is provided a dual transmit beam system rear side radar system including a rear side dead zone detection (BSD) region, a lane change assist (LCA) region and a rearward collision warning (RCW) A first transmit antenna that radiates a first transmit beam for detecting a first region comprising a first transmit antenna and a second region that is a backward frequency auxiliary (RCTA) region excluding a first region detected by the first transmit antenna; First and second receive antennas for receiving a received signal reflected on a target of the first region or the second region and a second transmit antenna for receiving a first A first reception signal processor for outputting an in-phase reception channel signal from a reception signal, a second reception signal processor for outputting an in-phase reception channel signal from a second reception signal of the second reception antenna, And the second received signal processing An AD converter for converting an output of the multiplexer into a digital received signal; and a controller for calculating detection information on the target using the digital received signal, and a multiplexer for multiplexing the received signals of the in- And a digital signal processor.

According to another aspect of the present invention, there is provided a dual beam transmission system including a rear side dead zone detection (BSD) region, a lane change assistance (LCA) region and a rearward collision warning (RCW) region A first transmit antenna for emitting a first transmit beam for detecting a first region comprising a first transmit antenna and a second region that is a backward frequency auxiliary (RCTA) region excluding a first region detected by the first transmit antenna; First and second receive antennas for receiving a received signal reflected on a target of the first region or the second region and a second receive antenna for receiving a second receive beam reflected from a target of the first region or the second region, A second reception signal processing unit for outputting an in-phase reception channel signal from a second reception signal of the second reception antenna, and a second reception signal processing unit for outputting an in- The output of the processing section is digitally received A second AD converter for converting the output of the second received signal processing unit into a digital received signal; a digital signal processor for calculating detection information for the target using the digital received signals; .

According to the present invention, BSD, LCA, RCTA and RCW regions are detected using two receive beams, while using a first transmit beam for detecting BSD, LCA and RCW regions and a second transmit beam for detecting an RCTA region And can simultaneously detect all the posterior lateral regions that contain it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating a rear side radar configuration of a dual transmission beam system according to an embodiment of the present invention; FIG.
FIG. 2 is a diagram showing a pattern of reception beams for detecting BSD, LCA, RCTA and RCW areas in a rear side radar of a dual transmission beam type according to the present invention; FIG.
3 is a graph showing an antenna pattern of a first transmission beam and an antenna pattern of a reception beam in a rear side radar of a dual transmission beam system according to the present invention.
4 is a graph showing an antenna pattern of a second transmission beam and an antenna pattern of a reception beam in a rear side radar of a double transmission beam system according to the present invention.
FIG. 5 is a graph illustrating an antenna pattern of a first transmission beam and an antenna pattern (Trx) of a first transmission beam and a reception beam in a rear side radar of a dual transmission beam system according to the present invention.
6 is a graph showing an antenna pattern of a second transmission beam and an antenna pattern (Trx) of a second transmission beam and a reception beam in a rear side radar of a dual transmission beam system according to the present invention.
FIG. 7 is a graph showing a detection area of a backward radar of a dual transmission beam system according to the present invention. FIG.
8 is a block diagram illustrating a rear side radar configuration of a dual transmission beam system according to another embodiment of the present invention.
9 is a block diagram illustrating a rear side radar configuration of a dual transmission beam system according to another embodiment of the present invention.

Other objects, features and advantages of the present invention will become apparent from the detailed description of the embodiments with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and an operation of an embodiment of the present invention will be described with reference to the accompanying drawings, and the configuration and operation of the present invention shown in and described by the drawings will be described as at least one embodiment, The technical idea of the present invention and its essential structure and action are not limited.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a preferred embodiment of a double-transmit beam type rear side radar according to the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, in order to simultaneously detect a plurality of detection regions including the BSD region, the LCA region, the RCTA region, and the RCW region, the rear side radar includes 2N (N = 1, 2, 3, And an antenna. The 2N transmit antennas are divided into two groups, the first group of transmit antennas is for detecting three regions including the BSD region, the LCA region and the RCW region, and the second group of transmit antennas is for detecting the RCTA region will be. However, in the following description, a rear side radar having two transmission antennas and two reception antennas will be described as an example.

1 is a block diagram illustrating a rear side radar configuration of a dual transmission beam system according to an embodiment of the present invention.

Referring to FIG. 1, a rear transmission radar of a dual transmission beam type includes a very high frequency module 100 and a signal processing module 200.

The microwave module 100 includes two transmission antennas 110 and 111 and two reception antennas 120a and 120b and a transmission signal processing unit 130 and a reception signal processing unit 140a and 140b.

The two transmission antennas 110 and 111 transmit a transmission signal for detecting a target and are divided into a first transmission antenna 110 and a second transmission antenna 111. [ Here, it is preferable that the transmission signal is a frequency modulated continuous wave (FMCW) signal.

FIG. 2 is a diagram illustrating a pattern of reception beams for detecting BSD, LCA, RCTA, and RCW regions in a rear side radar of a double transmission beam system according to the present invention. will be. As an example, the case where one radar is mounted on the rear right side of the vehicle is shown. In the following description, the radar position is referred to as a reference point.

As shown in FIG. 4, the BSD area represents a rear side square area of about 5 meters in the Y axis from the reference point and about 5 meters in the X axis. The LCA area represents the back side area from the reference point to the Y axis about 5 meters and the X axis about 75 meters away. The RCTA zone represents the rear parking assistance zone at a distance of about 55 meters from the reference point in the Y axis and a range of -5 meters to +10 meters in the X axis. The RCW area represents the rearward collision warning area up to about 70 meters from the reference point along the X axis, and the Y axis is the area close to the reference point. The four detection regions including the BSD region, the LCA region, the RCTA region, and the RCW region may be changed depending on the performance and the mounting position of the radar, but are based on matters generally defined in the technical field.

2, the first transmission antenna 110 emits a first transmission beam for detecting a first region including a BSD region, an LCA region, and an RCW region. And the second transmit antenna 111 emits the second transmit beam for detecting a second region comprising an RCTA region.

The first transmission antenna 110 is arranged such that the beam axis of the first transmission beam is directed to at least one of the BSD region, the LCA region, and the RCW region. Preferably, the directivity direction of the beam axis of the first transmission beam is arranged to detect both the BSD region, the LCA region and the RCW region. More preferably, the first transmission antenna 110 is arranged such that the beam axis of the first transmission beam is oriented in the LCA region.

FIG. 3 is a graph showing an antenna pattern of a first transmission beam and an antenna pattern of a reception beam in a rear side radar of a double transmission beam system according to the present invention. 3 and 5, the first transmission antenna 110 is a graph showing the antenna pattern of the first transmission beam and the antenna pattern (Trx) of the first transmission beam and the reception beam, Has an effective emission range of -90 degrees to +90 degrees and the maximum antenna gain of the first transmission beam is oriented to direct the LCA region. Particularly, the first transmission antenna 110 has an effective radiation range of -90 degrees to +90 degrees with respect to the first region, and the maximum transmission gain of the first transmission beam is oriented at an angle of -40 degrees.

The second transmission antenna 111 is arranged so that the beam axis of the second transmission beam is directed to the RCTA region so as to detect the RCTA region.

4 is a graph showing an antenna pattern of a second transmission beam and an antenna pattern of a reception beam in a rear side radar of a double transmission beam system according to the present invention, And the antenna pattern (Trx) of the second transmission beam and the reception beam, the second transmission antenna 111, for example, referring to FIGS. 4 and 6, Has an effective emission range of -90 degrees to +90 degrees and the maximum antenna gain of the second transmission beam is oriented to direct the RCTA region. Especially the maximum antenna gain of the second transmit beam is oriented at a 46 degree angle.

In order to design the antenna pattern according to the directing directions of the first and second transmission antennas 110 and 111, the phase is adjusted in the antenna feeding part (not shown).

Also, the first transmission beam of the first transmission antenna 110 and the second transmission beam of the second transmission antenna 111 may be simultaneously emitted. Alternatively, the first transmission beam of the first transmission antenna 110 and the second transmission beam of the second transmission antenna may be radiated alternately in time using an RF switch. That is, in the present invention, the RF switch is provided, and the first and second transmission antennas 110 and 111 alternately transmit the transmission beams according to switching of the RF switch. Alternatively, in the present invention, the first and second transmission antennas 110 and 111 may simultaneously emit the transmission beams without the RF switch.

The first and second receive antennas 120a and 102b receive the received signal reflected on the target of the first or second region.

The transmission signal processing unit 130 generates a transmission signal to be transmitted through the first and second transmission antennas 110 and 111 through modulation and frequency synthesis.

The first and second reception signal processing units 140a and 140b perform amplification, frequency synthesis, and filtering on the reception signals received through the first and second reception antennas 120a and 120b. That is, the reception signals are subjected to amplification, frequency synthesis, filtering, and the like in each reception path forming a reception channel corresponding to the reception antennas 120a and 120b, respectively. As an example, the amplification is to amplify to a power level corresponding to the analog-to-digital (AD) conversion processed at the later stage, and the frequency synthesis to convert to a lower frequency.

Particularly, the first and second reception signal processing units 140a and 140b multiply the reception signals by a signal having a quadrature phase in the frequency synthesis to generate quadrature-phase (I-phase) ) Receive channel signal (Q).

The first reception signal processing unit 140a outputs the in-phase reception channel signal and the quadrature-phase reception channel signal from the first reception signal of the first reception antenna 120a, and the second reception signal processing unit 140b outputs the in- Phase receive channel signal and a quadrature-phase receive channel signal from the second received signal of the antenna 120b.

As another example, the first and second transmission antennas 110 and 111, the first and second reception antennas 120a and 120b, the transmission signal processing unit 130, and the first and second reception signal processing units 140a and 140b may be single May be provided on the substrate.

The signal processing module 200 includes a plurality of AD converters 220, 221, 222, and 223 for converting a plurality of reception signals processed through amplification, frequency synthesis, filtering, and the like through a plurality of reception paths into a digital reception signal, And a digital signal processing processor (DSP) 230 for calculating angles and the like. The AD converters 220, 221, 222, and 223 are required to determine the dynamic range of the DBF (Digital Beamforming) 231 processed at the following stage, that is, the range of the signal intensity for indicating the performance required for the radar of the present invention. The converters 220, 221, 222, and 223 convert the channel-specific outputs of the first and second reception signal processing units 140a and 140b into digital reception signals, and are provided in respective paths of the in-phase reception channels and the quadrature reception channels.

The digital signal processing processor 230 uses the digital received signal to produce detection information for the target. The digital signal processing processor 230 performs Fast Fourier Transform (FFT) and correction processing and performs DBF (Digital Beamforming) processing for forming a double beam on the fast Fourier transform and the corrected result, (231), performs CFAR (Constant False Alarm Rate) detection, angle calculation and target number selection.

A micro control unit (MCU) 240 controls the logical functions that are processed and performed in the digital signal processing processor 230.

FIG. 7 is a graph illustrating a detection area of a backward radar of a double transmission beam system according to the present invention. Referring to FIG.

8 is a block diagram illustrating a rear side radar configuration of a dual transmit beam system according to another embodiment of the present invention. The block diagram of FIG. 8 is similar to that of FIG. 1, except that the in-phase signals outputted from the received signal processing units 140a to 140b ) Receive channel (I) of the receiving channel.

Accordingly, the multiplexer 210 in the signal processing module 200 multiplexes and outputs the reception signals I of the in-phase reception channel, and the AD converter 220 converts the analog reception signal output from the multiplexer 210 into digital Into a received signal.

Other configurations are the same as those in FIG. 1, so that details thereof will be omitted.

9 is a block diagram illustrating a rear side radar configuration of a dual transmit beam system according to another embodiment of the present invention. However, the present invention is not limited to the configuration of FIG. 8 except that AD converters 220 , 221).

The AD converters 220 and 221 disposed in the respective reception channels in the signal processing module 200 receive the in-phase reception channel reception signals I output from the reception signal processing units 140a to 140b, And converts it into a digital reception signal. That is, the AD converters 220 and 221 convert in-phase received signals I for each receiving channel into digital received signals, respectively

Other configurations are the same as those of Figs. 1 and 8, and therefore the details thereof will be omitted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

It is therefore to be understood that the embodiments of the invention described herein are to be considered in all respects as illustrative and not restrictive, and the scope of the invention is indicated by the appended claims rather than by the foregoing description, Should be interpreted as being included in.

100: super high frequency module 110: first transmission antenna
111: second transmission antenna 120a: first reception antenna
120b: second reception antenna 130: transmission signal processor
140a: first reception signal processing section 140b: second reception signal processing section
200: signal processing module 220, 221, 222, 223: AD converter
230: digital signal processor 231: DBF (Digital Beamforming)
240: Micro control unit (MCU)

Claims (11)

A first transmission antenna for emitting a first transmission beam for detecting a first area including a rear side dead zone detection (BSD) area, a lane change assist (LCA) area and a rearward collision alarm (RCW) area;
A second transmission antenna for emitting a second transmission beam for detecting a second area that is a rear parking assist (RCTA) area excluding a first area detected by the first transmission antenna;
First and second receive antennas for receiving a received signal reflected on a target of the first region or the second region;
A first reception signal processor for outputting an in-phase reception channel signal and a quadrature-phase reception channel signal from a first reception signal of the first reception antenna;
A second reception signal processor for outputting an in-phase reception channel signal and a quadrature reception channel signal from a second reception signal of the second reception antenna;
An AD converter for converting channel-specific outputs of the first and second reception signal processing units into a digital reception signal;
And a digital signal processing processor for using the digital received signal to calculate detection information for the target,
The LCA region is a 5-meter lateral side from the reference point on the Y-axis and a rear lateral region 75-meters rearward from the reference point on the X-
The RCW region is a rear region from the reference point to a position 70 meters behind the X axis,
The RCTA region is an area from the reference point to the side of 55 meters in the Y axis and to the rear of 10 meters in the X axis when the vehicle is a reference point and the traveling direction of the vehicle is the X axis and the lateral direction of the vehicle is the Y axis,
Wherein the first transmission beam of the first transmission antenna and the second transmission beam of the second transmission antenna are radiated alternately in time. 2. The apparatus of claim 1, wherein the first transmit antenna comprises:
Characterized in that the beam axis of the first transmission beam is arranged to direct the rear side dead zone detection (BSD) region and either the lane change assist (LCA) region or the rearward collision alert (RCW) Beam type rear side radar. 2. The apparatus of claim 1, wherein the first transmit antenna comprises:
And the beam axis of the first transmission beam is directed to the lane-changing assist (LCA) region. 2. The apparatus of claim 1, wherein the first transmit antenna comprises:
Characterized in that the first transmission beam has an effective radiation range of -90 degrees to +90 degrees with respect to the first area and the maximum antenna gain of the first transmission beam is directed towards the lane change aiding area (LCA) Rear side radar of the transmission beam system. 2. The receiver of claim 1,
And a beam axis of the second transmission beam is oriented to direct the rear parking assist (RCTA) region. 2. The receiver of claim 1,
Characterized in that the second transmission beam has an effective emission range of -90 degrees to +90 degrees with respect to the second region and the maximum antenna gain of the second transmission beam is directed to the rear parking assist (RCTA) region. Rear side radar of the transmission beam system. delete delete 2. The duplex transmission system of claim 1, wherein the first and second transmission antennas, the first and second reception antennas, and the first and second reception signal processing units are provided on a single substrate. . delete delete

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