KR101078836B1

KR101078836B1 - Radar system for supporting detection type of multiple radars

Info

Publication number: KR101078836B1
Application number: KR1020100016038A
Authority: KR
Inventors: 박성욱; 임윤택; 이지훈; 정용우; 이상익
Original assignee: 한국과학기술원
Priority date: 2010-02-23
Filing date: 2010-02-23
Publication date: 2011-11-02
Also published as: KR20110096676A

Abstract

The present invention relates to a radar system for detection, wherein the radar system of the present invention processes a baseband signal for each transmit and receive waveform used in a plurality of radar detection methods, and generates an intermediate frequency (IF) signal. A baseband module and an intermediate frequency signal generated by the baseband module are converted into a high frequency signal and transmitted, or a high frequency signal is received from the outside and converted into an intermediate frequency signal that can be processed by the baseband module to the baseband module. Contains an RF module to deliver. According to the present invention, since a plurality of radar detection methods can be implemented in one radar system, it is possible to compensate for the disadvantages while maintaining the advantages of each radar detection method.

Description

Radar system for supporting multiple radar detection methods {Radar system for supporting detection type of multiple radars}

The present invention relates to a radar system for detection, and more particularly, to a radar system capable of performing a multifunctional multi-purpose detection operation by integrating various radar detection methods.

The detection radar is widely used for commercial and military purposes and has a great demand both at home and abroad.However, the detection radar must be a highly specialized system that works by organically combining various kinds of technologies such as wireless, signal processing, and communication. The technology gap with foreign countries is a big field because it can play a role.

In general, the detection radar is mostly composed of the entire system rather than the part, and the operation timing of the detection radar must be properly functioned according to the operation mode such as transmission pulse period, reception signal digital conversion clock synchronization, and signal processing memory synchronization. Because of the normal operation of the system, complex and advanced design capabilities are required to ensure the consistent operation of the system.

In general, the radar detection method has a difference in recognition of detection information such as speed and distance depending on the characteristics of the transmitted and received waveform. Radar detection methods include a CW method, an FMCW method, and a chirp pulse method.

Figure 1 shows the detection distance of the CW method, FMCW method, chirp pulse method.

Referring to Figure 1, the features of each scheme will be described below.

First, the CW method can be used to detect motion at close range. In the forest or bush where infrared detection is not possible, it is easy to detect motion behind the wall, but it is impossible to detect distance with a single CW frequency.

Second, the FMCW method can be used to detect the distance and speed of a vehicle within a few km or a human eye, but it is impossible to detect two or more targets.

Third, the chirp pulse method can detect more than two objects, which can usually be used to detect aircraft within a few tens of kilometers. However, the chirp pulse method has a disadvantage that the speed and distance resolution may be inferior to the CW method and the FMCW method.

Conventionally, only a single detection method is applied to a single radar system. Therefore, in the radar system using only a single detection method, there are advantages and disadvantages of each detection method, so the application is limited, there are problems of high cost and long term development time due to research and development.

Disclosure of Invention The present invention has been made to solve the above problems, and an object thereof is to provide a multifunctional radar system capable of supporting a plurality of radar detection methods by sharing similar parts of a plurality of radar detection methods.

In addition, the present invention implements a low power consumption, lightweight system structure to improve portability and mobility than the conventional radar system, and the radar network to perform rapid deployment and multi-function monitoring in coastal and mountainous areas through the fluid layout Its purpose is to provide a radar system for building.

The radar system of the present invention for achieving the above object is a baseband module for processing the baseband signal for each transmit and receive waveform used in a plurality of radar detection methods, and generates an intermediate frequency (IF) signal; The RF module converts and transmits a high frequency signal using an intermediate frequency signal generated by the baseband module, or receives a high frequency signal from the outside and converts the signal into an intermediate frequency signal that can be processed by the baseband module and transmits the signal to the baseband module. It includes.

The baseband module may include a first central processing unit (CPU) that communicates with a PC graphical user interface (GUI) and transmits a control command signal, a clock generator for generating a clock signal, and a control command signal received from the first CPU. Field Programmable Gate Array (FPGA) for generating various waveforms using the clock signal generated by the clock generator, controlling the components of the baseband module, and a DAC for converting the digital signal from the FPGA into an analog signal ( Digital to Analog Converter), a first lowpass filter for filtering the signal from the DAC, a modulator for converting the signal from the first lowpass filter into an intermediate frequency band, a demodulator for demodulating the received intermediate frequency signal Analog to Digit for converting the received intermediate frequency signal or the signal from the demodulator to a digital signal al Converter), a DSP (Digital Signal Processor) module for performing a preprocessing process on the signal from the ADC, a calculation process, and a CPLD (Complex Programmable Logic Device) for performing timing control for signal processing of the DSP module. ) And a second CPU for transmitting a signal from the DSP module to the PC GUI.

The DSP module may include a first DSP for performing a preprocessing process on a signal from the ADC and a second DSP and a third DSP for distributing and processing a signal from the first DSP according to a calculation amount. .

The RF module may include a baseband amplifier (BB) for amplifying an intermediate frequency signal received from the baseband module and a first up / down signal for generating a first up / down signal using a signal from the BB amplifier. A first mixer, a first SAW filter for improving a band skirt characteristic of the first up / down signal, and a second up / down signal for generating a second up / down signal by using a signal from the first SAW filter 2 mixer, band pass filter (BPF) to remove harmonic components of the signal from the second mixer, drive / power amplifier to amplify the signal from the BPF, coupling the signal from the drive / power amplifier Coupler, isolator for transmitting the signal from the coupler, transmission antenna for transmitting the signal from the isolator to the outside, radio wave signal from outside A reception antenna for receiving a signal, a limiter for adjusting the strength of a signal received from the reception antenna, a low noise amplifier (LNA) for amplifying the signal from the limiter, and a signal for mixing the signal from the low noise amplifier A third mixer, a second SAW filter for improving a band skirt characteristic of a signal from the third mixer, a fourth mixer for mixing a signal from the second SAW filter, a band skirt of a signal from the fourth mixer A third SAW filter for improving output characteristics, a fifth mixer for mixing signals from the low noise amplifier, connecting the low noise amplifier and the third mixer, or connecting the low noise amplifier and the fifth mixer; A switch for switching, a second low pass filter for filtering the signal from the fifth mixer and the second low pass filter It may include an attenuator (Attenuator) for attenuating an output by the amplitude of the signal shown in.

The radar detection method may include a CW method, an FMCW method, and a chirp-pulse method.

When the radar detection scheme is set to the CW mode, the baseband module may activate the first CPU, the clock generator, the FPGA, the CPLD, the first DSP, and the second CPU.

When the radar detection method is set to the CW mode, the RF module includes the drive / power amplifier, the coupler, the isolator, the transmit antenna, the receive antenna, the limiter, the low noise amplifier, the switch, the first The mixer, the second low pass filter and the attenuator may be activated.

When the radar detection method is set to the FMCW mode, the baseband module, the first CPU, the clock generator, the FPGA, the DAC, the first low pass filter, the modulator, the ADC, the CPLD, The first DSP and the second CPU may be activated.

When the radar detection method is set to the FMCW mode, the RF module is the BB amplifier, the first mixer, the first SAW filter, the second mixer, the BPF, the drive / power amplifier, the coupler, The isolator, the transmit antenna, the receive antenna, the limiter, the low noise amplifier, the switch, the fifth mixer, the second low pass filter and the attenuator may be activated.

When the radar detection scheme is set to the chirp-pulse mode, the baseband module may include the first CPU, the clock generator, the FPGA, the DAC, the first lowpass filter, the modulator, the demodulator, and the The ADC, the CPLD, the first DSP, the second DSP, the third DSP and the second CPU may be activated.

When the radar detection method is set to the chirp-pulse mode, the RF module may include the BB amplifier, the first mixer, the first SAW filter, the second mixer, the BPF, the drive / power amplifier, and the The coupler, the isolator, the transmit antenna, the receive antenna, the limiter, the low noise amplifier, the switch, the third mixer, the second SAW filter, the fourth mixer and the third SAW filter may be activated.

According to the present invention, since a plurality of radar detection methods can be implemented in one radar system, it is possible to compensate for the disadvantages while maintaining the advantages of each radar detection method.

In addition, according to the present invention implements low power consumption, light weight than the conventional radar system has the effect of improving portability and mobility. Accordingly, the radar system of the present invention is expected to be usefully used in coastal and mountainous areas through a fluid arrangement.

1 shows a detection distance of the CW method, the FMCW method, and the chirp pulse method.
2 is a block diagram of a radar system according to an embodiment of the present invention.
3 is a block diagram of a baseband module according to an embodiment of the present invention.
4 is a block diagram of an RF module according to an embodiment of the present invention.
5 is a waveform diagram in an FMCW scheme according to an embodiment of the present invention.
6 and 7 are waveform diagrams in the chirp pulse method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used for the same reference numerals even though they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 is a block diagram of a radar system according to an embodiment of the present invention.

2, a radar system according to an embodiment of the present invention includes a baseband module 200 and an RF module 200.

The baseband module 100 processes baseband signals for each transmit and receive waveform used in a plurality of radar detection schemes, and generates an intermediate frequency (IF) signal.

The RF module 200 converts a high frequency signal using an intermediate frequency signal generated by the baseband module 100 and transmits the signal, or receives a high frequency signal from the outside and converts the signal into an intermediate frequency signal that can be processed by the baseband module. Transfer to the band module 100.

Now, detailed structures of the baseband module 100 and the RF module 200 will be described with reference to the drawings.

3 is a block diagram of a baseband module according to an embodiment of the present invention.

Referring to FIG. 3, the first CPU 103 communicates with a PC graphical user interface (GUI) 101 and transmits a control command signal to the FPGA 104.

The clock generator 102 serves to generate a clock signal.

The field programmable gate array (FPGA) 104 generates various waveforms using the control command signal received from the first CPU 103 and the clock signal generated by the clock generator 102, and configures the baseband module 100. Generate a control signal to control the element.

The Digital to Analog Converters (DACs) 105 and 106 serve to convert digital signals from the FPGA 104 into analog signals.

The first low pass filter 108, 109 filters the signals from the DACs 105, 106.

The modulator 110 converts the signal from the first low pass filter 108 and 109 into an intermediate frequency band and transmits an intermediate frequency signal If_tx.

The demodulator 111 demodulates the received intermediate frequency signal If_rx.

The ADCs 115 and 116 convert the received intermediate frequency signal If_rx or the signal from the demodulator into a digital signal.

The DSP modules 118, 119, and 120 perform preprocessing on the signals from the ADCs 115 and 116 and perform calculations.

In the present invention, the DSP module includes a first DSP 118 for performing a preprocessing process on signals from the ADCs 115 and 116 and a second signal for distributing and processing signals from the first DSP 118 according to a calculation amount. DSP 119 and third DSP 120 are included.

The CPLD 117 performs timing control for signal processing of the DSP modules 118, 119, and 120.

The second CPU 121 transfers signals from the DSP modules 118, 119, and 120 to the PC GUI 101.

4 is a block diagram of an RF module 200 according to an embodiment of the present invention.

Referring to FIG. 4, the BB amplifier 201 amplifies the intermediate frequency signal If_rx received from the baseband module 100.

The first mixer 202 serves to generate a first up / down signal using a signal from the BB amplifier 201.

The first SAW filter 203 serves to improve a band skirt characteristic of the first up / down signal.

The second mixer 204 generates a second up / down signal by using the signal from the first SAW filter 203.

The band pass filter (BPF) 205 removes harmonic components of the signal from the second mixer 204.

The drive / power amplifier 207 serves to amplify the signal from the BPF 205.

Coupler 208 serves to couple the signal from drive / power amplifier 207.

Isolator 209 serves to transmit the signal from coupler 208 to transmit antenna 210.

The transmit antenna 210 transmits a signal from the isolator 209 to the outside.

The receiving antenna 212 serves to receive radio signals from the outside.

The limiter 211 serves to adjust the strength of the signal received from the receiving antenna 212.

The low noise amplifier (LNA) 215 serves to amplify the signal from the limiter 211.

The third mixer 222 mixes signals from the low noise amplifier 215.

The second SAW filter 223 serves to improve the band skirt characteristic of the signal from the third mixer 222.

The fourth mixer 225 mixes the signal from the second SAW filter 223.

The third SAW filter 226 serves to output the intermediate frequency signal If_rx by improving the band skirt characteristic of the signal from the fourth mixer 225.

The fifth mixer 217 mixes signals from the low noise amplifier 215.

The switch 216 serves to connect the low noise amplifier 215 and the third mixer 222 or switch to connect the low noise amplifier 215 and the fifth mixer 217.

The second low pass filter 218 filters the signal from the fifth mixer 217.

The attenuator 221 attenuates the amplitude of the signal from the second low pass filter 218 and outputs the attenuated amplitude.

As described above, the radar system of the present invention comprises a baseband module 100 and an RF module 200. The internal configuration of the baseband module 100 is as shown in FIG. The internal structure of the 200 is as shown in FIG.

In the present invention, the radar detection method includes a CW method, an FMCW method, and a chirp-pulse method.

In the present invention, the radar system differs in blocks driven according to each radar detection method. For example, the radar system of the present invention has different blocks activated according to the CW method, the FMCW method, and the chirp pulse method. This will be described in detail below.

In the present invention, when the radar detection method is set to the CW method mode, the baseband module 100, the first CPU 103, clock generator 102, FPGA 104, CPLD 117, switch 114 The first DSP 118 and the second CPU 121 are activated.

In addition, when the radar detection system is set to the CW system mode, the RF module 200 includes the LO-CW 214, the switch 206, the drive / power amplifier 207, the coupler 208, and the isolator 209. , Transmit antenna 210, receive antenna 212, switch 213, limiter 211, low noise amplifier 215, switch 216, fifth mixer 217, second low pass filter 218 and The attenuator 221 is activated.

In the present invention, when the radar detection method is set to the FMCW mode, the baseband module 100, the first CPU 103, clock generator 102, FPGA 104, DAC 105, the first low pass The filter 108, the frequency synthesizer 107, the modulator 110, the switch 114, the ADC 115, the CPLD 117, the first DSP 118 and the second CPU 121 are activated.

In addition, when the radar detection method is set to the FMCW method mode, the RF module 200, the BB amplifier 201, LO-1 220, the first mixer 202, the first SAW filter 203, LO -2 (219), second mixer 204, BPF 205, drive / power amplifier 207, coupler 208, switch 213, isolator 209, transmit antenna 210, receive antenna ( 212, limiter 211, low noise amplifier 215, switch 216, fifth mixer 217, second low pass filter 218 and attenuator 221 are activated.

In the present invention, when the radar detection scheme is set to the chirp-pulse mode, the baseband module 100 may include a first CPU 103, a clock generator 102, an FPGA 104, a DAC 105, 106, First low pass filter 108, 109, frequency synthesizer 107, modulator 110, switch 114, demodulator 111, low pass filter 112, 113, ADC 116, CPLD 117 The first DSP 118, the second DSP 119, the third DSP 120, and the second CPU 121 are activated.

In addition, when the radar detection method is set to the chirp-pulse method mode, the RF module 200 includes the BB amplifier 201, the LO-1 220, the first mixer 202, and the first SAW filter 203. LO-2 219, second mixer 204, BPF 205, drive / power amplifier 207, coupler 208, switch 213, isolator 209, transmit antenna 210, receive Antenna 212, limiter 211, low noise amplifier 215, switch 216, third mixer 222, second SAW filter 223, amplifier 224, fourth mixer 225 and third SAW filter 226 is activated.

5 is a waveform diagram of an I (Inphase) channel in the FMCW method according to an embodiment of the present invention, Figure 6 is a waveform diagram of an I channel in the chirp pulse method according to an embodiment of the present invention, Figure 7 A waveform diagram of a quadrature phase (Q) channel in the chirp pulse method according to an embodiment of the present invention.

Each of the waveforms in FIGS. 5 to 7 is a waveform at a transmit (Tx) end / receive (Rx) end of the RF module 200 and is used to calculate speed and distance.

While the invention has been described using some preferred embodiments, these embodiments are illustrative and not restrictive. Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the invention and the scope of the rights set forth in the appended claims.

100 Baseband Module 200 RF Module
101 PC GUI 102 Clock Generator
103 First CPU 104 FPGA
105, 107 DAC 108, 109 First low pass filter
110 modulator 111 demodulator
115, 116 ADC 117 CPLD
118 1st DSP 119 2nd DSP
120 3rd DSP 121 2nd CPU
201 BB Amplifier 202 First Mixer
203 First SAW Filter 204 Second Mixer
205 BPF 207 Drive / Power Amplifiers
208 Coupler 209 Isolator
210 transmit antenna 211 limiter
212 receive antenna 215 low noise amplifier
216 Switch 217 Fifth Mixer
218 2nd low pass filter 221 attenuator
222 3rd Mixer 223 2nd SAW Filter
225 4th Mixer 226 3rd SAW Filter

Claims

A baseband module for processing a baseband signal for each transmit and receive waveform used in a plurality of radar detection schemes and for generating an intermediate frequency (IF) signal; And
The RF module converts and transmits a high frequency signal using an intermediate frequency signal generated by the baseband module, or receives a high frequency signal from the outside and converts the signal into an intermediate frequency signal that can be processed by the baseband module and transmits the signal to the baseband module. Radar system comprising a.

The method of claim 1,
The baseband module,
A first central processing unit (CPU) that communicates with a PC graphical user interface (GUI) and transmits a control command signal;
A clock generator for generating a clock signal;
A field programmable gate array (FPGA) for generating various waveforms by using the control command signal received from the first CPU and the clock signal generated by the clock generator, and controlling components of the baseband module;
A digital to analog converter (DAC) for converting a digital signal from the FPGA into an analog signal;
A first low pass filter for filtering the signal from the DAC;
A modulator for converting the signal from the first low pass filter into an intermediate frequency band;
A demodulator for demodulating the received intermediate frequency signal;
An analog to digital converter (ADC) for converting the received intermediate frequency signal or the signal from the demodulator into a digital signal;
A digital signal processor (DSP) module for performing a preprocessing process on a signal from the ADC and performing a calculation process;
A CPLD (Complex Programmable Logic Device) for performing timing control for signal processing of the DSP module; And
And a second CPU for transmitting a signal from the DSP module to the PC GUI.

The method of claim 2,
The DSP module,
A first DSP for performing a preprocessing process on the signal from the ADC; And
And a second DSP and a third DSP for distributing and processing the signal from the first DSP according to a calculation amount.

The method of claim 3,
The RF module,
A baseband amplifier for amplifying the intermediate frequency signal received from the baseband module;
A first mixer for generating a first up / down signal by using the signal from the BB amplifier;
A first SAW filter for improving a band skirt characteristic of the first up / down signal;
A second mixer for generating a second up / down signal using the signal from the first SAW filter;
A band pass filter (BPF) for removing harmonic components of the signal from the second mixer;
A drive / power amplifier for amplifying the signal from the BPF;
A coupler for coupling a signal from the drive / power amplifier;
An isolator for transmitting a signal from the coupler;
A transmission antenna for transmitting a signal from the isolator to the outside;
A reception antenna for receiving radio signals from the outside;
A limiter for adjusting the strength of a signal received from the receiving antenna;
A low noise amplifier (LNA) for amplifying the signal from the limiter;
A third mixer for mixing signals from the low noise amplifier;
A second SAW filter for improving a band skirt characteristic of the signal from the third mixer;
A fourth mixer for mixing the signal from the second SAW filter;
A third SAW filter for improving and outputting a band skirt characteristic of the signal from the fourth mixer;
A fifth mixer for mixing signals from the low noise amplifier;
A switch for connecting the low noise amplifier and the third mixer or switching the low noise amplifier and the fifth mixer;
A second low pass filter for filtering the signal from the fifth mixer; And
And an attenuator for attenuating and outputting an amplitude of the signal from the second low pass filter.

The method of claim 4, wherein
The radar detection method includes a CW method, an FMCW method, and a chirp-pulse method.

The method of claim 5,
When the radar detection method is set to the CW mode,
And the baseband module is configured to activate the first CPU, the clock generator, the FPGA, the CPLD, the first DSP, and the second CPU.

The method of claim 5,
When the radar detection method is set to the CW mode,
The RF module includes the drive / power amplifier, the coupler, the isolator, the transmit antenna, the receive antenna, the limiter, the low noise amplifier, the switch, the fifth mixer, the second low pass filter, and the attenuator. Radar system, characterized in that is activated.

The method of claim 5,
If the radar detection method is set to the FMCW mode,
The baseband module is configured to activate the first CPU, the clock generator, the FPGA, the DAC, the first low pass filter, the modulator, the ADC, the CPLD, the first DSP, and the second CPU. Radar system characterized by.

The method of claim 5,
If the radar detection method is set to the FMCW mode,
The RF module includes the BB amplifier, the first mixer, the first SAW filter, the second mixer, the BPF, the drive / power amplifier, the coupler, the isolator, the transmission antenna, the reception antenna, and the limiter. And the low noise amplifier, the switch, the fifth mixer, the second low pass filter and the attenuator are activated.

The method of claim 5,
When the radar detection method is set to the chirp-pulse method mode,
The baseband module may include the first CPU, the clock generator, the FPGA, the DAC, the first low pass filter, the modulator, the demodulator, the ADC, the CPLD, the first DSP, the second DSP, And the third DSP and the second CPU are activated.

The method of claim 5,
When the radar detection method is set to the chirp-pulse method mode,
The RF module includes the BB amplifier, the first mixer, the first SAW filter, the second mixer, the BPF, the drive / power amplifier, the coupler, the isolator, the transmission antenna, the reception antenna, and the limiter. And the low noise amplifier, the switch, the third mixer, the second SAW filter, the fourth mixer and the third SAW filter are activated.