KR101568239B1 - Apparatus and method for processing signal for millimeter wave seeker - Google Patents
Apparatus and method for processing signal for millimeter wave seeker Download PDFInfo
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- KR101568239B1 KR101568239B1 KR1020150127696A KR20150127696A KR101568239B1 KR 101568239 B1 KR101568239 B1 KR 101568239B1 KR 1020150127696 A KR1020150127696 A KR 1020150127696A KR 20150127696 A KR20150127696 A KR 20150127696A KR 101568239 B1 KR101568239 B1 KR 101568239B1
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
- G01S13/10—Systems for measuring distance only using transmission of interrupted, pulse modulated waves
- G01S13/22—Systems for measuring distance only using transmission of interrupted, pulse modulated waves using irregular pulse repetition frequency
- G01S13/227—Systems for measuring distance only using transmission of interrupted, pulse modulated waves using irregular pulse repetition frequency with repetitive trains of uniform pulse sequences, each sequence having a different pulse repetition frequency
Abstract
Description
The present invention relates to a signal processing apparatus and method for a millimeter wave searcher, and more particularly, to a millimeter wave searcher for generating a digital range signal for distance measurement in a millimeter wave searcher, To a signal processing apparatus and method for a millimeter-wave searcher.
A searcher such as a radar is a device that obtains information about the position of an object by determining the azimuth and distance of the target object using the reflection and scattering characteristics of the radio wave. That is, the radar sends the radio wave to the target, receives the reflected wave of the radio wave energy, and measures the position of the target by the roundtrip time and the directivity characteristic of the antenna using the directivity and the fixed property of the radio wave.
Conventional searchers use the Ku band with a frequency of 12 to 14 GHz or the Ka band with a frequency of 27 to 40 GHz to operate a searcher. However, navigation systems for guided weapons are required to be smaller in size and capable of high resolution target identification. For such high resolution, it is required to develop a searcher for the W band (75 to 110 GHz), which is a high frequency band. The W-band signal is a millimeter wave having a wavelength of 3 to 5 mm, which is very short in wavelength, which is advantageous for high resolution.
A receiver of a searcher using a conventional W-band signal receives a receive signal, which is an analog signal, and combines it with a local signal generated by a local oscillator to down-convert the signal into a signal having a frequency of several tens MHz. The receiver of the searcher then filters and amplifies the down-converted received signal. Then, the receiver of the searcher converts the filtered and amplified received signal into a digital signal and transmits the digital signal to the signal processor to analyze the digital signal to detect the target.
1 is a block diagram of a receiver of a conventional searcher using a W-band signal.
Referring to FIG. 1, in a conventional searcher, a receiver includes a very
The
The intermediate frequency receiver 20 receives the down-converted received signal as a signal of the intermediate frequency band and combines it with a second local signal generated by a second local oscillator (IF local oscillator) to generate a baseband frequency Into a received signal. The intermediate frequency receiver 20 transmits the converted baseband received signal to an AD converter (ADC), and the AD converter (ADC) converts the baseband received signal into a digital signal and transmits the digital signal to the
The
The receiver of the W-band searcher uses the range signal to avoid the distance measurement of the target and the radar eclipse phenomenon. A receiver generates a range signal using a signal of a specific channel in an intermediate frequency receiver. The receiver of the searcher generates the range signal using the analog signal of the specific channel received by the intermediate frequency receiver and the specific timing signal provided by the signal processor. Here, the specific timing signal means a signal synchronized with a gate signal necessary for operating the searcher.
These explorers are subject to a lot of spatial restrictions in order to apply them to various operating environments. Particularly, when the analog intermediate frequency receiver is replaced with a digital intermediate frequency (IF) receiver or the signal channel processed by the intermediate frequency receiver increases, the size of the searcher also increases proportionally.
Here, a separate space is required for modulating the signal and transmitting the modulated signal to the signal processor. For this reason, it is difficult to limit the spatial limit and the miniaturization of the intermediate frequency receiver 20.
On the other hand, the conventional searcher is disadvantageous in that it is vulnerable to noise and spur until the analog signal is modulated by the receiver and then transmitted to the signal processor. In addition, the conventional seeker requires a separate receiving module for generating the range signal when designing a digital intermediate frequency (IF) receiver that replaces the intermediate frequency receiver.
The embodiments of the present invention generate a digital range signal for distance measurement and avoidance of eclipse in a searcher in consideration of a delay time generated in the process of converting an analog-digital signal, and use the generated digital range signal A signal processing apparatus and method for a millimeter-wave searcher capable of detecting a distance from a target and continuously tracking the target without missing the target.
According to a first aspect of the present invention, there is provided an antenna apparatus comprising: an analog-to-digital converter for converting an analog received signal received through at least one reception antenna into a digital signal; A first signal processing unit for moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal; Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, A second signal processing unit for shifting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And a detection processing unit for calculating a distance to the target using the generated complex number signal and the generated digital range signal and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse phenomenon A signal processing apparatus for a searcher may be provided.
Wherein the first signal processor comprises: a first down-converter for shifting the converted digital signal to a first digital signal of a predetermined intermediate frequency band; And a first digital signal processor for generating a complex signal by changing the moved first digital signal from a time domain to a frequency domain.
Wherein the second signal processing unit comprises: a timing signal generator for generating a timing signal delayed by a delay time generated when the analog reception signal is changed to a digital signal in the analog-digital converter; A modulator for modulating the converted digital signal according to the generated timing signal; A second down converter for shifting the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And a second digital signal processor for converting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal.
The timing signal generator may generate a timing signal at a time point that is a center of a received signal in a reception interval for tracking the target, by delaying the delay signal by a delay time generated when an analog signal is changed to a digital signal.
The timing signal generator may generate a timing signal based on a pulse repetition frequency (PRF) for operating a millimeter wave searcher.
The second digital signal processor may convert the fixed-point data of the moved second digital signal into a predetermined bit of floating-point data to generate a digital range signal.
According to a second aspect of the present invention, there is provided a method of converting an analog received signal received through at least one reception antenna into a digital signal; Moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal; Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, To a second digital signal of a predetermined intermediate frequency band, and changing the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And controlling a pulse repetition frequency (PRF) for avoiding radar eclipse by calculating a distance to the target using the generated complex number signal and the generated digital range signal A signal processing method for a searcher can be provided.
Wherein the generating the complex number signal comprises: moving the transformed digital signal to a digital signal of a predetermined intermediate frequency band; And generating a complex signal by changing the moved first digital signal from a time domain to a frequency domain.
Generating the digital range signal includes generating a timing signal delayed by a delay time generated when the analog receive signal is changed to a digital signal in the analog-digital converter; Modulating the converted digital signal according to the generated timing signal; Moving the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And changing the moved second digital signal from the time domain to the frequency domain to generate a digital range signal.
The step of generating the timing signal may generate a timing signal at a time point that is delayed by a delay time occurring when the analog signal is changed to a digital signal, but is a center of the received signal in a reception interval for tracking the target.
The step of generating the timing signal may generate a timing signal based on a pulse repetition frequency (PRF) operating the millimeter wave searcher.
The step of generating the digital range signal may convert the fixed-point data of the moved second digital signal into a predetermined-bit floating-point data to generate a digital range signal.
The embodiments of the present invention generate a digital range signal for distance measurement and avoidance of radar eclipse in a millimeter-wave searcher in consideration of a delay time generated in the process of converting an analog-digital signal and output the generated digital range signal It is possible to detect the distance to the target and to keep track of the target without missing.
Embodiments of the present invention can generate a digital range signal and detect a distance to a target from an intermediate frequency receiver using a conventional analog signal, thereby being robust against signal noise and spur.
Embodiments of the present disclosure can contribute to further miniaturization of the searcher by implementing a searcher without spatial constraints due to the channel increase of the intermediate frequency receiver.
1 is a block diagram of a receiver of a conventional searcher using a W-band signal.
2 is a block diagram of a signal processing apparatus for a millimeter wave searcher according to an embodiment of the present invention.
3 is an explanatory diagram of a timing signal according to an embodiment of the present invention.
4 is a flowchart of a signal processing method for a millimeter wave searcher 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 describing the embodiments, descriptions of techniques which are well known in the technical field to which this specification belongs and which are not directly related to this specification are not described. This is for the sake of clarity without omitting the unnecessary explanation and without giving the gist of the present invention.
For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.
2 is a block diagram of a signal processing apparatus for a millimeter wave searcher according to an embodiment of the present invention.
2, the
The specific configuration and operation of each component of the millimeter wave seeker
An analog-to-digital converter (ADC) 210 converts an analog received signal received through at least one reception antenna into a digital signal through analog-to-digital conversion. The analog-to-
The first
The second
Thereafter, the
Meanwhile, the first and
The
The first
A first down-converter (DDC) 221 moves the digital signal converted by the analog-to-digital converter (ADC) 210 to a first digital signal of a predetermined intermediate frequency band. The
The first
The
The
That is, the
The
Then, the
The second
3 is an explanatory diagram of a timing signal according to an embodiment of the present invention.
The timing signal generation process according to the conventional and one embodiment of the present specification is shown in FIGS. 3A and 3B, respectively.
The timing signal used in the conventional intermediate frequency (IF) receiver is generated as shown in Fig. 3 (a). A conventional timing signal is generated in correspondence with a reception section in which a transmission signal transmitted in a transmission section is reflected on a target object and received. At this time, a timing signal is generated every time the center of the reception signal of the reception section becomes the center.
However, the
Meanwhile, the timing generator according to the embodiment of the present invention generates a timing signal as shown in FIG. 3 (b). That is, the timing generation unit generates a timing signal by reflecting the delay time? T generated when converting the analog signal into the digital signal, and transmits the generated timing signal to the
Subsequently, the
4 is a flowchart of a signal processing method for a millimeter wave searcher according to an embodiment of the present invention.
The analog-to-
The first
Subsequently, the
Meanwhile, the second
The
Subsequently, the
The
On the other hand, the
It will be understood by those skilled in the art that the present specification may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present specification is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present specification Should be interpreted.
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, It is not intended to limit the scope of the specification. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.
200: signal processing device
210: analog-to-digital conversion section
220: first signal processor
221: First down converter
222: a first digital signal processor
230: second signal processor
231:
232: second down converter
233: Second digital signal processor
234: Timing signal generator
240:
Claims (12)
A first signal processing unit for moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal;
Wherein the analog-to-digital conversion unit generates a timing signal in consideration of a delay time generated when an analog received signal is changed to a digital signal, modulates the converted digital signal according to the generated timing signal, A second signal processing unit for shifting the shifted second digital signal from a time domain to a frequency domain to generate a digital range signal; And
A detection processing unit for calculating a distance to the target using the generated complex number signal and the generated digital range signal and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse,
And a signal processing unit for searching the signal processing apparatus.
The first signal processor
A first down-converter for shifting the converted digital signal into a first digital signal of a predetermined intermediate frequency band; And
A first digital signal processor for generating a complex signal by changing the shifted first digital signal from a time domain to a frequency domain,
And a signal processing unit for searching the signal processing apparatus.
The second signal processor
A timing signal generator for generating a timing signal delayed by a delay time generated when the analog reception signal is changed to a digital signal in the analog-digital converter;
A modulator for modulating the converted digital signal according to the generated timing signal;
A second down converter for shifting the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And
A second digital signal processor for generating a digital range signal by changing the shifted second digital signal from a time domain to a frequency domain,
And a signal processing unit for searching the signal processing apparatus.
The timing signal generator
And generates a timing signal at a time point that is delayed by a delay time generated when an analog signal is changed to a digital signal but is a center of a received signal in a reception interval for tracking the target.
The timing signal generator
A signal processor for a seeker that generates a timing signal based on a pulse repetition frequency (PRF) operating a millimeter wave searcher.
The second digital signal processor
And converting the fixed-point data of the moved second digital signal into floating-point data of predetermined bits to generate a digital range signal.
Moving the converted digital signal to a first digital signal of a predetermined intermediate frequency band and changing the shifted first digital signal from a time domain to a frequency domain to generate a complex signal;
Generating a timing signal in consideration of a delay time generated when the analog receive signal is changed to a digital signal, modulating the converted digital signal according to the generated timing signal, and outputting the modulated digital signal to a predetermined intermediate frequency band Shifting the shifted second digital signal from the time domain to the frequency domain to generate a digital range signal; And
Calculating a distance to the target using the generated complex number signal and the generated digital range signal, and controlling a pulse repetition frequency (PRF) for avoiding radar eclipse
And a signal processing method for a searcher.
The step of generating the complex number signal
Moving the converted digital signal to a digital signal of a predetermined intermediate frequency band; And
Generating a complex signal by changing the shifted first digital signal from a time domain to a frequency domain;
And a signal processing method for a searcher.
The step of generating the digital range signal
Generating a timing signal delayed by a delay time generated when the analog received signal is changed to a digital signal;
Modulating the converted digital signal according to the generated timing signal;
Moving the modulated digital signal to a second digital signal of a predetermined intermediate frequency band; And
Generating a digital range signal by changing the shifted second digital signal from a time domain to a frequency domain
And a signal processing method for a searcher.
The step of generating the timing signal
Generating a timing signal at a time point that is delayed by a delay time occurring when an analog signal is changed to a digital signal but is a center of a received signal in a reception interval for tracking the target.
The step of generating the timing signal
A signal processing method for a seeker that generates a timing signal based on a pulse repetition frequency (PRF) operating a millimeter wave searcher.
The step of generating the digital range signal
And converting the fixed-point data of the moved second digital signal into floating-point data of predetermined bits to generate a digital range signal.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101754235B1 (en) | 2016-10-27 | 2017-07-05 | 엘아이지넥스원 주식회사 | Self-test method of millimeter-wave seeker |
| KR101754236B1 (en) | 2016-10-27 | 2017-07-05 | 엘아이지넥스원 주식회사 | Millimeter-wave seeker |
| KR101839046B1 (en) * | 2017-10-11 | 2018-03-15 | 엘아이지넥스원 주식회사 | Apparatus and method for obtaining SAR image can miniaturize |
| KR101889005B1 (en) * | 2017-08-22 | 2018-08-16 | 엘아이지넥스원 주식회사 | Signal Processing Apparatus for Millimeter Wave Seeker using Fast Fourier Transform and Method thereof |
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| US20060049981A1 (en) | 2002-05-16 | 2006-03-09 | Kristian Merkel | Method and apparatus for processing high time-bandwidth signals using a material with inhomogeneously broadened absorption spectrum |
| KR100947215B1 (en) | 2008-02-12 | 2010-03-11 | 포항공과대학교 산학협력단 | Rf signal transceiver in radar system and method thereof |
| KR101043647B1 (en) | 2010-08-27 | 2011-06-22 | 엘아이지넥스원 주식회사 | Data converting device and data converting method |
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| US20060049981A1 (en) | 2002-05-16 | 2006-03-09 | Kristian Merkel | Method and apparatus for processing high time-bandwidth signals using a material with inhomogeneously broadened absorption spectrum |
| KR100947215B1 (en) | 2008-02-12 | 2010-03-11 | 포항공과대학교 산학협력단 | Rf signal transceiver in radar system and method thereof |
| KR101043647B1 (en) | 2010-08-27 | 2011-06-22 | 엘아이지넥스원 주식회사 | Data converting device and data converting method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101754235B1 (en) | 2016-10-27 | 2017-07-05 | 엘아이지넥스원 주식회사 | Self-test method of millimeter-wave seeker |
| KR101754236B1 (en) | 2016-10-27 | 2017-07-05 | 엘아이지넥스원 주식회사 | Millimeter-wave seeker |
| KR101889005B1 (en) * | 2017-08-22 | 2018-08-16 | 엘아이지넥스원 주식회사 | Signal Processing Apparatus for Millimeter Wave Seeker using Fast Fourier Transform and Method thereof |
| KR101839046B1 (en) * | 2017-10-11 | 2018-03-15 | 엘아이지넥스원 주식회사 | Apparatus and method for obtaining SAR image can miniaturize |
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