KR101419733B1 - Radar and method for processing signal of the radar - Google Patents

Radar and method for processing signal of the radar Download PDF

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KR101419733B1
KR101419733B1 KR1020100058726A KR20100058726A KR101419733B1 KR 101419733 B1 KR101419733 B1 KR 101419733B1 KR 1020100058726 A KR1020100058726 A KR 1020100058726A KR 20100058726 A KR20100058726 A KR 20100058726A KR 101419733 B1 KR101419733 B1 KR 101419733B1
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South Korea
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signal
chirp
chirp signal
generated
cycle
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KR1020100058726A
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Korean (ko)
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KR20110138690A (en
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송경진
이재은
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주식회사 만도
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Abstract

The present invention uses a chirp signal generated by transmitting and receiving a chirp signal of either an upchip signal or a down chirp signal and a superimposed chirp signal generated in a previous cycle to detect a distance between the target and a vehicle The present invention relates to a radar and a signal processing method thereof that can shorten the signal processing time by reducing the time required to process the response signal received from each chirp signal while reducing the information acquisition time.
The present invention relates to a communication apparatus, a communication method, a communication method, a communication method, a communication method, a communication method, a communication method, Wherein the signal processing unit determines that the transmission signal of the next cycle is to be transmitted as a chirp signal of either an up chirp signal or a down chirp signal, Acquiring a distance between the vehicle and the target in the next cycle, and information on the vehicle using the chirp signal generated by transmitting and receiving the determined chirp signal and one of the chirp signals generated in the immediately preceding cycle It provides a radar that features.

Description

[0001] RADAR AND METHOD FOR PROCESSING SIGNAL OF THE RADAR [0002]

The present invention relates to a radar and a signal processing method therefor, and more particularly to a radar and a signal processing method therefor. More particularly, the present invention relates to a radar and a signal processing method thereof, A radar and a signal for reducing the signal processing time by reducing the time for processing the response signal received from each chirp signal while reducing the information acquisition time by acquiring information of the vehicle information and the target by using the signal And a method of processing the same.

RADAR (Radio Detection And Ranging) is a sensing device that emits electromagnetic waves and receives reflected waves reflected by objects in the area to detect the presence and distance of the target. It has all weather functions regardless of weather conditions or day and night Short

It also has the advantage of detecting long distance objects on the opposite side of the earth beyond the horizon.

In such a conventional radar, a modulation method of a transmission signal exists in various ways such as a pulse method, a frequency modulated continuous wave (FMCW) method, a frequency shift keying (FSK) method, The way to extract the distance is different.

The radar adopting the conventional FMCW scheme acquires a signal in which the transmission signal s1 and the reaction signal s2 are mixed in the periods a1, a2 and a3 as shown in Fig. 1 to calculate the distance to the target and the speed of the vehicle And extracted.

However, a radar adopting the FMCW method may require a longer time compared to other methods because it can acquire both the distance to the target and the speed information of the vehicle only if the up-chirp signal and the down-chirp signal having opposite slopes are respectively present .

An object of the present invention is to provide a chirp signal generated by transmitting / receiving a chirp signal of either an upchip signal or a down chirp signal and a chirp signal generated by using a superimposed chirp signal generated in a previous cycle, And to reduce the time required for processing the response signal received from each chirp signal and to shorten the signal processing time by acquiring information about the vehicle and the vehicle.

According to an aspect of the present invention, there is provided a radar device including a transmitter for transmitting a transmission signal, a receiver for receiving a response signal reflected back from the target, And a signal processing unit for obtaining a distance between the vehicle and the target based on the signal and information about the vehicle, wherein the signal processing unit sets the transmission signal of the next cycle as an up chirp signal or a down chirp signal The chirp signal generated by transmitting and receiving the determined chirp signal and the superimposed chirp signal generated in the immediately preceding cycle are used to transmit the chirp signal to the vehicle and the target And the information of the vehicle.

Wherein the signal processing unit comprises: a judging unit for judging whether the chirp signal of the previous cycle is an upchip signal or a down chirp signal; And a chirp signal generating section for generating a chirp signal that is inverse to the determination result of the determining section.

Wherein the transmission signal of one period comprises an upchip signal and a down-chirp signal, the transmission signal of one period is generated by one of the overlapping chirp signals generated in the immediately preceding cycle, And a chirp signal generated by transmitting and receiving the chirp signal.

And the signal processing unit provides the transmission signal to the transmission unit after a predetermined time has elapsed.

The method of processing a signal of a radar according to another embodiment of the present invention may further include the step of determining that the signal processing unit transmits a transmission signal of a next cycle to either an up chirp signal or a down chirp signal ; And a signal processing unit for calculating a distance between the vehicle and the target in the next cycle using the chirp signal generated by transmitting and receiving the determined chirp signal and one of the chirp signals generated in the immediately preceding cycle, And a step of acquiring the information of the information processing apparatus.

Wherein the determining step comprises the steps of: determining whether the signal processing unit is an up-chirp signal or a down-chirp signal; And generating a chirp signal that is opposite to a determination result of the signal processing unit in the determining step.

Wherein the transmission signal of one period comprises an upchip signal and a down-chirp signal, the transmission signal of one period is generated by one of the overlapping chirp signals generated in the immediately preceding cycle, And a chirp signal generated by transmitting and receiving the chirp signal.

The method of processing a radar signal according to another embodiment of the present invention may further include the step of providing the chirp signal to the transmitter after the predetermined time has elapsed after the determining step .

According to the embodiment of the present invention, by using the chirp signal generated by transmitting / receiving the chirp signal of either the upchip signal or the down chirp signal and the superimposed chirp signal generated in the immediately preceding cycle, The speed of the vehicle, and the angle, it is possible to reduce the information acquisition time and shorten the signal processing time by reducing the processing time of the response signal received from each chirp signal.

In addition, according to the embodiment of the present invention, since the period is constituted by one chirp signal of the upchip signal or the down chirp signal and one of the chirp signals generated in the previous cycle, the conventional FMCW method It is possible to acquire much more information than the adopted radar and to provide reliable information.

Brief Description of the Drawings Fig. 1 is a diagram showing signals transmitted and received in a radar employing a conventional FMCW scheme. Fig.
2 is a view for explaining a radar according to an embodiment of the present invention;
3 is a flowchart illustrating an operation of a radar signal processing method according to an embodiment of the present invention.
4 is a diagram illustrating signals transmitted and received in a radar according to an embodiment of the present invention.

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

2 is a view for explaining a radar according to an embodiment of the present invention.

2, a radar 10 according to an embodiment of the present invention includes a transmission unit 11 for transmitting a transmission signal through a transmission antenna ANT, a transmission unit 11 for transmitting a transmission signal through a reception antenna ANT1 to ANTN, And a signal processing unit 13 for obtaining the distance between the vehicle and the target and the information of the vehicle (that is, the speed and angle of the vehicle) using the transmission signal and the reaction signal .

The radar 10 to be dealt with in the present invention is a radar employing the FMCW method. The radar 10 frequency-modulates a continuous waveform signal and transmits the resultant signal through a transmission antenna ANT. The radar 10 reflects a reaction signal reflected from the target to the reception antennas ANT1 to ANTN ≪ / RTI >

The transmission unit 11 transmits a transmission signal provided from the signal processing unit 13 through a transmission antenna ANT as a target and the transmission unit 11 includes a PLL 111, a VCO 112, and a first amplifier 113 do.

The VCO 112 (Voltage Controlled Oscillator) modulates the frequency of the transmission signal provided from the PLL 111 so that the frequency of the transmission signal provided from the signal processing unit 13 is kept constant. And provides it to the first amplifier 113. The first amplifier 113 amplifies the modulated frequency to a predetermined magnitude.

The signal processing section 13 decides to transmit the transmission signal of the next cycle to either of the up chirp signal or the down chirp signal to be transmitted to the transmission section 11 described above. Further, the signal processing unit 13 uses the chirp signal generated by transmitting and receiving the determined chirp signal and the chirp signal generated by overlapping the chirp signals already processed in the previous cycle, Can be calculated. Here, the upchip signal refers to a signal that increases with time, and the down-chirp signal refers to a signal that decreases with time.

The signal processing unit 13 includes a determination unit 131 and a generation unit 132.

The determination unit 131 determines whether the chirp signal of the previous cycle is an upchip signal or a downchip signal. For example, in the case where the chirp signal of the previous cycle is a chirp signal adjacent to the next cycle, the chirp signal is a chirp signal.

The generation unit 132 generates a chirp signal that is inverse to the determination result of the determination unit 131. [ For example, when the chirp signal of the previous cycle is a down-chirp signal, the generator 132 generates the up-chirp signal.

The signal processing unit 13 transmits the chirp signal generated by the generating unit 132 as a target via the transmitting unit 11 and the transmitting antenna ANT and outputs a response signal for the transmitted chirp signal to the receiving antennas ANT1 to ANTN And the reception unit 12 and calculates the distance between the vehicle and the target, the speed and angle of the vehicle, and the like using the chirp signal generated in the previous cycle and the chirp signal newly generated and transmitted and received .

Accordingly, the signal processing section 13 superimposes one chirp signal already generated in the previous cycle, thereby generating two types of chirp signals (for example, an upchip signal and a down-chirp signal, or a down- Upkeep signal) can be shortened.

Further, the signal processing section 13 can provide a transmission signal to the transmission section 11 after a preset time has elapsed. For example, the signal processing unit 13 may place a time delay between each chirp signal in Fig. 4 or after one triangular waveform period. This temporal delay performed in the signal processing section 13 can be appropriately used in case of intentionally or when signal processing time is required for system stabilization.

The receiver 12 generates a beat signal having a frequency difference between the local oscillation signals used as a reference signal for time delay measurement between the transmitted chirp signal and the response signal delayed by the propagation distance of the radio wave.

This receiver 12 may be configured to receive the response signal reflected from the target via the receive antenna ANT and include a frequency mixer 122, a filter 123 and an analog-to-digital converter 124.

First, the second amplifier 121 amplifies the response signal received through the reception antenna ANT1 by a predetermined magnitude.

The frequency mixer 122 receives the transmission signal at the LO port and generates a bit signal of the intermediate frequency band based on the response signal amplified by the second amplifier 121. The bit signal generated by the frequency mixer 122 is passed through a filter, for example, a low pass filter (LPF) to filter low frequency bit signals.

The analog-to-digital converter 124 converts the filtered bit signal into a digital signal.

The signal processing unit 13 detects the frequency of the bit signal from the digital signal by the analog-to-digital converter 124 by applying Fast Fourier Transform (FFT) And the distance between the target and the vehicle, the speed and angle of the vehicle can be obtained.

Particularly, the signal processor 13 uses the chirp signal generated by transmitting and receiving the chirp signal and the chirp signal generated by the conventional FMCW method when acquiring the distance from the target by using one of the chirp signals already generated in the previous cycle It is possible to shorten the processing time compared to the time spent in processing each of the two kinds of chirp signals in the radar.

A signal processing method of a radar having such a configuration will now be described with reference to FIGS. 3 and 4. FIG.

 FIG. 3 is a flowchart illustrating an operation of a radar signal processing method according to an embodiment of the present invention. FIG. 4 is a diagram illustrating signals transmitted and received by a radar device according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the signal processing unit 13 provides a transmission signal including an upchain signal and a down-chirp signal to the transmission unit 11 (S101). At this time, the transmission signal corresponds to b1 in Fig. 4 as the first transmission signal. The transmission signal of the first period is determined as a transmission signal of two types of up-chirp signal and down-chirp signal, and from the next cycle, either the up-chirp signal or the down-chirp signal is determined as the transmission signal. And the determined transmission signal may be provided to the transmission unit 11 after a predetermined time has elapsed. If a signal processing time is required intentionally or for system stabilization, for example, there may be a time delay between the transmission signal, i.e., each chirp signal, or after one triangular waveform period.

Next, the signal processing unit 13 receives the response signal to the transmission signal through the receiving unit 12 (S103).

Next, the signal processing unit 13 applies the bit signal generated by the received response signal delayed by the distance between the transmitted transmission signal and the target to the FFT speaker number to acquire the distance between the vehicle and the target, the speed and angle of the vehicle (S105).

Next, in order to determine a transmission signal of the next cycle, the signal processing unit 13 determines whether one of the chirp signals generated in the previous cycle is an upchip signal or a downchain signal (S107).

If it is determined in step S107 that one of the chirp signals generated in the immediately preceding cycle is an upchip signal, the signal processor 13 outputs the down chirp signal opposite to the upchip signal as a transmission signal of the next cycle (S109).

If it is determined in step S107 that one of the chirp signals generated in the immediately preceding cycle is a down chirp signal, the signal processing unit 13 outputs the up chirp signal, which is opposite to the down chirp signal, (S110).

The signal processing unit 13 uses the chirp signal generated by transmitting / receiving a chirp signal of either the upchip signal or the down-chirp signal and the superimposed chirp signal generated in the immediately preceding cycle, The distance, the speed and the angle of the vehicle (S111).

The signal processing unit 13 determines whether the start of the vehicle is finished (S113).

If it is determined in step S113 that the vehicle has not been started, the process moves to step S107 to determine whether one of the chirp signals of the previous cycle is an upchip signal or a downchap signal. And performs the above-described S109 or S110 according to the determination result.

The signal processing method of the radar will be further described with reference to FIG.

(b1) receives the first transmission signal s1 and receives the response signal s2 responsive to the target, and obtains the information between the vehicle and the target in the first period by the chirp signals generated in the first period have. This is the same as (a1) shown in FIG. 1 of the related art, but it is different from the next cycle to be transmitted thereafter.

That is, (b2) corresponds to the next period, and since the chirp signal of the first period adjacent to the next period is the down-chirp signal, the transmission signal of the next period is determined as the up-chirp signal. Information between the vehicle and the target is obtained by using the chirp signal generated by transmitting and receiving the determined upchip signal and the chirp signal generated from the down-chirp signal of the chirp signals in the first period.

Likewise, in (b3), since the chirp signal of (b2) adjacent to (b3) is the upchip signal, the down chirp signal is determined as the transmission signal in the period (b3). Information between the vehicle and the target can be obtained by using the chirp signal generated by transmitting and receiving the determined down-chirp signal and the chirp signal generated from the up-chirp signal among the chirp signals in the period (b2).

Thus, by using the chirp signal generated in the previous cycle as the chirp signal of the up-chirp signal or the down-chirp signal as the transmission signal, the information between the vehicle and the target can be acquired quickly, It is possible to provide reliable information as the amount of acquired information increases.

The invention being thus described, it will be obvious that the same way may be varied in many ways. Such modifications are intended to be within the spirit and scope of the invention as defined by the appended claims.

10: Radar 11: Transmitter
12: Receiver 13: Signal processor
131: Decision Unit 132:

Claims (8)

A distance between the vehicle and the target and information on the vehicle based on the transmission signal and the reaction signal of one cycle; And a signal processing unit for acquiring a signal,
The signal processing unit
A chirp signal generated by transmitting and receiving the determined chirp signal, and a chirp signal generated in the immediately preceding cycle and a chirp signal generated in the previous cycle, And obtains the distance between the vehicle and the target in the next cycle, the information of the vehicle, using one of the chirp signals. The method according to claim 1,
The signal processing unit
A judging unit for judging whether the chirp signal of the previous cycle is an upchip signal or a down chirp signal; And
And a chirp signal generator for generating a chirp signal that is opposite to a determination result of the determination unit. The method of claim 2,
Wherein the transmission signal of one cycle consists of an upchip signal and a down-chirp signal,
Wherein the transmission signal of one period comprises a chirped signal generated by transmitting and receiving a chirp signal generated by the generator, and a superimposed chirp signal generated from the chirp signals generated in the immediately preceding cycle. The method according to claim 1,
The signal processing unit
And provides the transmission signal to the transmission unit after a predetermined time has elapsed. A distance between the vehicle and the target and information on the vehicle based on the transmission signal and the reaction signal of one cycle; A signal processing method of a radar including a signal processing unit
Determining that the signal processing unit is to transmit a transmission signal of a next cycle to either one of an up chirp signal and a down chirp signal; And
Wherein the signal processing unit uses the chirp signal generated by transmitting and receiving the determined chirp signal and the overlapping chirp signal generated in the immediately preceding cycle to calculate a distance between the vehicle and the target in the next cycle, And obtaining information on the radar signal. The method of claim 5,
The step of determining
Determining whether the chirp signal of the immediately preceding period is an upchip signal or a down chirp signal; And
And generating a chirp signal that is opposite to a determination result of the signal processing unit in the determining step. The method of claim 6,
Wherein the transmission signal of one cycle consists of an upchip signal and a down-chirp signal,
Wherein the transmission signal of one period comprises a chirp signal generated by transmitting and receiving a chirp signal generated by the generating step and one superimposed chirp signal generated in the immediately preceding cycle. Signal processing method. The method of claim 5,
After said determining step,
And providing the chirp signal to the transmitter after the predetermined time has elapsed from the signal processing unit.
KR1020100058726A 2010-06-21 2010-06-21 Radar and method for processing signal of the radar KR101419733B1 (en)

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KR101598344B1 (en) * 2012-02-29 2016-02-29 한화탈레스 주식회사 Fmcw radar system usign adaptive scheduler
KR102077106B1 (en) * 2012-09-04 2020-02-13 현대모비스 주식회사 Method for Processing Radar Signal Auto Adjustable of Voltage Offset
KR102037035B1 (en) * 2012-10-15 2019-10-28 현대모비스 주식회사 Radar Apparatus Having Voltage Saturation Preventing Function of Base Band Signal and Method Therefore
KR101968874B1 (en) * 2018-09-21 2019-04-12 부산대학교 산학협력단 Lora communication system and method with improved data rate
WO2021038628A1 (en) * 2019-08-23 2021-03-04 日本電信電話株式会社 Radar device and distance measuring method

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JP2005083867A (en) * 2003-09-08 2005-03-31 Mitsubishi Electric Corp Target-pursuing system
KR20070089789A (en) * 2005-01-19 2007-09-03 스미스 그룹 피엘씨 Radar apparatus
JP2008020432A (en) * 2006-06-12 2008-01-31 Mitsubishi Electric Corp Radar system
JP2008537590A (en) * 2005-02-23 2008-09-18 オーソトロン カンパニーリミテッド CHANNEL ESTIMATION METHOD AND CHANNEL ESTIMATION DEVICE FOR ELECTROMAGNETIC MULTIPATH CHARACTERISTICS BETWEEN TRANSMITTER / RECEIVER USING CHIRP SIGNAL

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Publication number Priority date Publication date Assignee Title
JP2005083867A (en) * 2003-09-08 2005-03-31 Mitsubishi Electric Corp Target-pursuing system
KR20070089789A (en) * 2005-01-19 2007-09-03 스미스 그룹 피엘씨 Radar apparatus
JP2008537590A (en) * 2005-02-23 2008-09-18 オーソトロン カンパニーリミテッド CHANNEL ESTIMATION METHOD AND CHANNEL ESTIMATION DEVICE FOR ELECTROMAGNETIC MULTIPATH CHARACTERISTICS BETWEEN TRANSMITTER / RECEIVER USING CHIRP SIGNAL
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