KR101032300B1 - Radar receiving apparatus for correcting noise gain using digital variable attenuator and method thereof - Google Patents

Radar receiving apparatus for correcting noise gain using digital variable attenuator and method thereof Download PDF

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KR101032300B1
KR101032300B1 KR1020100120349A KR20100120349A KR101032300B1 KR 101032300 B1 KR101032300 B1 KR 101032300B1 KR 1020100120349 A KR1020100120349 A KR 1020100120349A KR 20100120349 A KR20100120349 A KR 20100120349A KR 101032300 B1 KR101032300 B1 KR 101032300B1
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amount
noise
signal
digital
received signal
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김태환
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삼성탈레스 주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/28—Details of pulse systems
    • G01S7/2813—Means providing a modification of the radiation pattern for cancelling noise, clutter or interfering signals, e.g. side lobe suppression, side lobe blanking, null-steering arrays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/35—Details of non-pulse systems
    • G01S7/352—Receivers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • G01S2007/356—

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

PURPOSE: A device and method for receiving a radar capable of correcting a noise gain by using a DVA(Digital Variable Attenuator) are provided to secure the dynamic area of the radar and secure the linearity of a signal process. CONSTITUTION: A DVA(110) receives fed back control signal for controlling the attenuation amount of a received signal and attenuates the received signal by using the fed back control signal. An ADC(Analog-to-Digital Converter)(120) converts the attenuated signal into a digital signal. A digital signal processor(130) calculates the noise amount of the received signal from the digital signal and generates a control signal for controlling the attenuation amount of the received signal by using the calculated noise amount.

Description

Radar receiver and method for correcting noise gain using DVA {RADAR RECEIVING APPARATUS FOR CORRECTING NOISE GAIN USING DIGITAL VARIABLE ATTENUATOR AND METHOD THEREOF}

The present invention relates to a radar receiving apparatus and method, and more particularly to a radar receiving apparatus and method for correcting the noise gain using the DVA.

In modern radar receivers, noise is an important factor in determining performance. In modern warfare, targets with very small radar cross section (RCS), such as stealth aircraft, must be detected / tracked in various clutter environments. In order to detect / track a target having a very small radar cross section, the dynamic range of the radar should be as wide as possible. In addition, linearity must be guaranteed in the signal processing in the dynamic region.

In general, the main configuration for determining the dynamic range of a radar is an analog-digital converter. The input dynamic range of the analog-to-digital converter may be defined as the ratio of the maximum input value of the analog-to-digital converter to the amount of noise input to the analog-to-digital converter, and the digital processing gain of the analog-to-digital converter to the input dynamic range. This is because gain plus gain becomes the dynamic range of the radar.

Looking at the dynamic range of the radar, it can be seen that the amount of noise input to the analog-to-digital converter is an important factor in determining the dynamic range of the radar. In order to ensure linearity in the dynamic range of the radar, the noise amount is always constant. It can be seen that it needs to be maintained.

However, many analog devices used in the analog-to-digital converter deteriorate due to environmental factors such as ambient temperature, place or time, and the amount of noise is changed, and linearity is reduced to reduce the dynamic range of the radar. This means that in modern warfare it is difficult to detect / track a target with a very small radar cross section, such as a stealth machine.

Therefore, in order to maintain linearity and thereby secure dynamic range, the amount of noise included in the analog signal input to the analog-to-digital converter needs to be kept constant at all times.

An object of the present invention is to provide a radar receiving apparatus for correcting the noise gain using the DVA.

Another object of the present invention is to provide a radar receiving method for correcting a noise gain using a DVA.

The radar receiving apparatus for correcting the noise gain using the DVA according to the above object of the present invention is a digital signal for receiving a control signal for adjusting the amount of attenuation of a received signal and attenuating the received signal using the feedback control signal. A digital variable attenuator (DVA), an analog-to-digital converter for converting the attenuated received signal into a digital signal, and the digital signal received from the converted digital signal. Calculate the amount of noise of the received signal from the signal, generate a control signal for adjusting the attenuation amount of the received signal to maintain a constant amount of noise of the received signal using the calculated amount of noise, and generates the generated control signal And a digital signal processor feeding back the digital variable attenuator. Here, when the digital signal processor determines that the calculated noise amount is greater than a predetermined reference noise amount, the digital signal processor generates a control signal for increasing the attenuation amount of the received signal by the corresponding amount, and the calculated noise amount is the reference job. If it is determined that the volume is less than the volume, it may be configured to generate a control signal to reduce the attenuation amount of the received signal by the corresponding amount. The digital signal processor may be configured to calculate an amount of noise of the received signal in a frequency domain. The digital signal processing unit calculates a control signal for adjusting the attenuation amount of the received signal according to the following equation,

Figure 112010078659820-pat00001
, remind
Figure 112010078659820-pat00002
Is the calculated amount of noise,
Figure 112010078659820-pat00003
Is the predetermined reference noise amount,
Figure 112010078659820-pat00004
Is a predetermined constant,
Figure 112010078659820-pat00005
Is the processing gain, and
Figure 112010078659820-pat00006
Is a noise mean value defined according to the following equation,
Figure 112010078659820-pat00007
, remind
Figure 112010078659820-pat00008
Is a predetermined constant,
Figure 112010078659820-pat00009
May be configured to be a processing gain.

The radar receiving method for correcting the noise gain by using the DVA according to the above object of the present invention, the analog-to-digital conversion unit receives the received signal attenuated by the digital variable attenuator and converts it into a digital signal, digital signal processing Additionally receiving the converted digital signal, calculating a noise amount of the received signal from the received digital signal, and using the calculated noise amount, the digital signal processor to maintain a constant noise level of the received signal. Generating a control signal for adjusting the attenuation amount of the received signal, feeding back the generated control signal to the digital variable attenuator by the digital signal processor, and using the control signal received by the digital variable attenuator Attenuates the received signal and exits the analog-to-digital converter It may be configured to include the step of. Here, in the digital signal processor generating the control signal for adjusting the attenuation amount of the received signal such that the amount of noise of the received signal is kept constant using the calculated amount of noise, the calculated amount of noise If it is determined that the amount of noise is greater than a reference noise, a control signal is generated to increase the amount of attenuation of the received signal by a corresponding amount. It can be configured to generate a control signal to be. Here, the digital signal processing unit receiving the converted digital signal, and calculating the amount of noise of the received signal from the received digital signal, may be configured to calculate the amount of noise of the received signal in the frequency domain .

According to the radar receiving apparatus and method for correcting the noise gain using the DVA as described above, by maintaining the noise amount of the input signal input to the analog-to-digital converter to ensure a constant linearity in the signal processing process, radar This has the effect of ensuring the maximum dynamic range of. Radar's dynamic range ensures that even radar cross-sections can be easily detected and tracked.

1 is a block diagram of a radar receiving apparatus for correcting a noise gain using a DVA according to an embodiment of the present invention.
2 is a detailed configuration diagram of a radar receiver for correcting a noise gain using a DVA according to an embodiment of the present invention.
3 is a flowchart of a radar receiving method for correcting a noise gain using a DVA according to an embodiment of the present invention.
4 is a graph illustrating simulation results of a radar receiver and a method for correcting a noise gain using a DVA according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

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

1 is a block diagram of a radar receiving apparatus for correcting a noise gain using a DVA according to an embodiment of the present invention.

Referring to FIG. 1, a radar receiving apparatus 100 (hereinafter, referred to as a “radar receiving apparatus”) for correcting a noise gain using a DVA according to an embodiment of the present invention may include a digital variable attenuation unit 110 and an analog. It may be configured to include a digital converter 120 and a digital signal processor 130.

The radar receiving apparatus 100 maintains a constant amount of noise of the analog input signal input to the analog-digital converter 110, thereby ensuring linearity in the signal processing of the digital signal processor 130, and Make the dynamic area as wide as possible. Accordingly, the radar receiving apparatus 100 may easily detect / track even a target having a small cross-sectional area of the radar. Hereinafter, the detailed structure is demonstrated.

The digital variable attenuator 110 is configured to receive a feedback of a control signal for adjusting an attenuation amount of the received signal and attenuate the received signal using the feedback control signal. The digital variable attenuator 110 is configured to attenuate the analog input signal. The digital variable attenuator 110 also attenuates the amount of noise included in the analog input signal according to the signal attenuation of the digital variable attenuator 110. The digital variable attenuator 110 receives the control signal from the digital signal processor 130, and attenuates the signal by adjusting the attenuation amount of the received signal according to the attenuated control signal.

In the general radar receiver, the digital variable attenuator 110 is not included, but in the present invention, the digital radar receiver is configured to be included in the front end of the analog-to-digital converter 120 in the general radar receiver. This is because the signal input to the analog-to-digital converter 120 has a lot of linearity distortion depending on the surrounding environment.

The analog-to-digital converter 120 (ADC) is configured to convert the received signal attenuated by the digital variable attenuator 110 into a digital signal. In the analog-to-digital converter 120, since the received signal whose noise amount is already constant is converted into a digital signal, linearity is guaranteed.

The digital signal processor 130 receives a digital signal converted by the analog-digital converter 120, calculates a noise amount of the received signal from the received digital signal, and calculates the calculated noise amount. Using to generate a control signal for adjusting the attenuation amount of the received signal so that the noise level of the received signal is kept constant. The control signal is fed back to the digital variable attenuation unit 110.

The digital signal processor 130 may be controlled such that the amount of noise included in the signal output from the analog-to-digital converter 120 is equal to the amount of noise of the previous received signal. The digital signal processor 130 controls the amount of signal attenuation of the digital variable attenuator 110 in order to maintain a constant level of noise.

When the digital signal processor 130 determines that the calculated noise amount is greater than the predetermined reference noise amount, the digital signal processor 130 generates a control signal for increasing the attenuation amount of the received signal by the corresponding amount, and determines that the calculated noise amount is smaller than the reference noise amount. The control signal is generated to reduce the attenuation of the received signal by the corresponding amount. That is, the digital signal processor 130 controls the amount of noise included in the received signal to be maintained regardless of the magnitude of the received signal. Thus, if the amount of noise is less than the reference, the attenuation of the signal is less or not. If the amount of noise is more than the reference, the signal is attenuated. In this case, the reference noise amount is preferably the amount of noise included in the previous received signal.

Meanwhile, the digital signal processor 130 may be configured to calculate the noise amount of the received signal in the frequency domain when calculating the noise amount. When calculating the amount of noise, the output signal of the analog-to-digital converter 120 can be immediately averaged without converting the frequency domain to obtain a noise amount, but spurious signals included in the output signal have a lot of errors in calculating the amount of noise. Will result. Therefore, to exclude the spurious signal, it is desirable to calculate the amount of noise in the frequency domain. Hereinafter, the noise amount calculation process will be described in more detail.

First, the noise may be expressed as Equation 1 below.

Figure 112010078659820-pat00010

From here,

Figure 112010078659820-pat00011
Is the noise included in the signal input to the analog-to-digital converter 120, and the unit is [V] as a root mean square (rms) value. And h is the quantization step,
Figure 112010078659820-pat00012
Is a constant.

The noise is changed according to heat or time, and the digital signal processor 130 performs a fast fourier transform to perform frequency conversion. At this time, the components x, i = 0,1,2, ..., N corresponding to the FFT coefficient, N are generated, and noise can be obtained by averaging the amplitude of these components as shown in Equation 2 below. have.

Figure 112010078659820-pat00013

As a result of calculating the amount of noise in the radar receiving apparatus 100 according to the present invention, in general, the noise generally represents a normal distribution, whereas in the present invention, the Rayleigh distribution is calculated in the digital signal processing. Indicates. The average value of Rayleigh distribution is shown in Table 1.

value Distribution sun Average value Input Noise of the Analog-to-Digital Converter Normal distribution 0 Output Noise of Digital Signal Processing Unit Rayleigh distribution

Figure 112010078659820-pat00014

Meanwhile, in Table 1

Figure 112010078659820-pat00015
Represents the processing gain, which is the processing gain
Figure 112010078659820-pat00016
May be expressed as Equation 3 below.

Figure 112010078659820-pat00017

From here,

Figure 112010078659820-pat00018
Is the digital filter loss,
Figure 112010078659820-pat00019
Is the digital filter bandwidth,
Figure 112010078659820-pat00020
Is the IF bandwidth filter,
Figure 112010078659820-pat00021
Is the number of samples input from the digital filter 121 to the digital signal processor 130,
Figure 112010078659820-pat00022
Is a scaling factor obtained by subtracting the number of resolution bits of the analog-to-digital converter 120 from the number of bits calculated by the digital signal processor 130. And
Figure 112010078659820-pat00023
Is the FFT coefficient. In this case, the digital filter 121 is configured to be included in the rear end of the analog-digital converter 120 and the front end of the digital signal processor 130.

Meanwhile, the average noise value calculated by the digital signal processor 130 using Equation 3 and Table 1

Figure 112010078659820-pat00024
May be expressed as Equation 4 below.

Figure 112010078659820-pat00025

The average amount of such noise

Figure 112010078659820-pat00026
May be adopted as a reference noise amount for correcting the amount of noise input to the analog-digital converter 120.

And the amount of noise and reference noise of the current input signal

Figure 112010078659820-pat00027
The ratio of may be expressed as Equation 5 below.

Figure 112010078659820-pat00028

Where the amount of noise and the reference noise of the current input signal

Figure 112010078659820-pat00029
Rain of
Figure 112010078659820-pat00030
The digital signal processor 130 may be included in a control signal for attenuation control of the digital variable attenuator 110. In other words,
Figure 112010078659820-pat00031
If is greater than 1, the amount of current noise is greater than the reference, increase the amount of signal attenuation,
Figure 112010078659820-pat00032
If is less than 1, the amount of current noise is less than the reference, and thus the amount of signal attenuation can be reduced.

Meanwhile, the specification of the characteristic value of the radar receiving apparatus 100 may be configured as shown in Table 2 below.

parameter value Receiver gain

Figure 112010078659820-pat00033
) 48 [dB] Ratio of ADC input noise to quantization interval (
Figure 112010078659820-pat00034
) 20 ADC resolution bit (
Figure 112010078659820-pat00035
) 16 bit DSP Calculation Bits (
Figure 112010078659820-pat00036
) 32 bit Digital filter bandwidth (
Figure 112010078659820-pat00037
) 2.6 [MHz] IF filter bandwidth (
Figure 112010078659820-pat00038
) 10 [MHz] Number of DSP input samples
Figure 112010078659820-pat00039
) 1024 Number of FFTs 1024

2 is a detailed configuration diagram of a radar receiver for correcting a noise gain using a DVA according to an embodiment of the present invention.

Referring to FIG. 2, the radar receiving apparatus 100 may include a low noise amplifier 101, a first mixer 102, an amplifier 104, an RF band filter 104, a second mixer 105, and a digital gain control unit 106. ), The digital variable attenuator 110, the IF band filter 111, the analog-to-digital converter 120, the digital filter 121, and the digital signal processor 130. Here, most of the configuration is the same as the existing configuration. However, the digital variable attenuator 110 is configured to attenuate the analog input signal according to the control of the digital signal processor 130. Accordingly, the digital variable attenuator 110 is located in front of the analog-digital converter 120. Will be constructed. In addition, the digital signal processor 130 may generate a feedback control signal according to the noise amount calculation, unlike the conventional method, and feed back the digital attenuation controller 110.

3 is a flowchart of a radar receiving method for correcting a noise gain using a DVA according to an embodiment of the present invention.

Hereinafter, the detailed structure is demonstrated. First, the analog-digital converter 120 receives a received signal attenuated by the digital variable attenuator 110 and converts the received signal into a digital signal (S110).

The digital signal processor 130 receives the digital signal converted by the analog-digital converter 120 and calculates an amount of noise of the received signal from the received digital signal (S120). At this time, the digital signal processor 130 is preferably configured to calculate the amount of noise of the received signal in the frequency domain. This is to prevent the noise calculation error caused by the spurious signal.

Next, the digital signal processor 130 generates a control signal for adjusting the attenuation amount of the received signal so that the noise amount of the received signal is kept constant using the noise amount calculated above (S130). Here, when the digital signal processor 130 determines that the calculated noise amount is greater than the predetermined reference noise amount, the digital signal processor 130 generates a control signal for increasing the attenuation amount of the received signal by the corresponding amount, and the calculated noise amount is smaller than the reference noise amount. If so, it may be configured to generate a control signal that reduces the amount of attenuation of the received signal by that amount. The reference noise amount may be an average noise amount as the noise amount of the previous signal.

Next, the digital signal processor 130 feeds back the previously generated control signal to the digital variable attenuator 110 (S140).

The digital variable attenuator 110 attenuates the received signal using the feedback control signal and outputs the received signal to the analog-digital converter 120 (S150). As a result, the input signal input to the analog-to-digital converter 120 maintains a constant noise level, thereby ensuring linearity in the digital signal processing process and ensuring a wide radar operating area.

4 is a graph illustrating simulation results of a radar receiver and a method for correcting a noise gain using a DVA according to an embodiment of the present invention.

Referring to FIG. 4, the reception gain of the radar receiver 100 and the signal attenuation amount of the digital variable attenuator 110 are illustrated. In FIG. 4, even when the amount of noise input to the analog-to-digital converter 120 changes as the reception gain is changed, it can be seen that the amount of noise input is kept constant in the present invention. That is, the dynamic area of the radar receiving apparatus 100 may be secured.

Although described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the claims below. Could be.

Claims (7)

A digital variable attenuator (DVA) receiving a control signal for adjusting an attenuation amount of a received signal and attenuating the received signal by using the feedback control signal;
An analog-to-digital converter (ADC) for converting the attenuated received signal into a digital signal;
Receiving the converted digital signal, calculating a noise amount of the received signal from the received digital signal, and adjusting the attenuation amount of the received signal to maintain a constant noise level of the received signal using the calculated noise amount And a digital signal processor (DSP) for generating a control signal and feeding back the generated control signal to the digital variable attenuator. The method of claim 1, wherein the digital signal processing unit,
If it is determined that the calculated noise amount is greater than a predetermined reference noise amount, a control signal is generated to increase the attenuation amount of the received signal by the corresponding amount,
And determining that the calculated noise amount is smaller than the reference noise amount, and generating a control signal to reduce the attenuation amount of the received signal by the corresponding amount. The method of claim 1, wherein the digital signal processing unit,
Radar receiving apparatus for correcting the noise gain by using the DVA, characterized in that for calculating the noise amount of the received signal in the frequency domain. The method of claim 2, wherein the digital signal processing unit,
A control signal for adjusting the attenuation amount of the received signal is calculated according to the following equation,
Figure 112011009517547-pat00040
,
remind
Figure 112011009517547-pat00041
Is the calculated amount of noise,
Figure 112011009517547-pat00042
Is the predetermined reference noise amount,
Figure 112011009517547-pat00043
Is a predetermined constant,
Figure 112011009517547-pat00044
Is the processing gain,
remind
Figure 112011009517547-pat00045
Is a noise mean value defined according to the following equation,
Figure 112011009517547-pat00046
,
remind
Figure 112011009517547-pat00047
Is a predetermined constant,
Figure 112011009517547-pat00048
Radar receiving apparatus for correcting the noise gain using the DVA, characterized in that the processing gain. Converting, by the analog-digital converter, the received signal attenuated by the digital variable attenuator to a digital signal;
Receiving, by the digital signal processor, the converted digital signal, and calculating an amount of noise of the received signal from the received digital signal;
Generating, by the digital signal processor, a control signal for adjusting an attenuation amount of the received signal such that the amount of noise of the received signal is kept constant using the calculated amount of noise;
Feeding back the generated control signal to the digital variable attenuator by the digital signal processor;
And a digital attenuator attenuates a received signal by using the feedback control signal and outputs the received signal to the analog-to-digital converter. The method of claim 5, wherein the digital signal processing unit generates a control signal for adjusting the attenuation amount of the received signal so that the amount of noise of the received signal is kept constant using the calculated amount of noise.
If it is determined that the calculated noise amount is greater than a predetermined reference noise amount, a control signal is generated to increase the attenuation amount of the received signal by the corresponding amount, and if it is determined that the calculated noise amount is smaller than the reference noise amount, the received signal Radar receiving method for correcting the noise gain by using a DVA, characterized in that for generating a control signal to reduce the amount of attenuation by a corresponding amount. The method of claim 5, wherein the digital signal processor receives the converted digital signal and calculates an amount of noise of the received signal from the received digital signal.
Radar reception method for correcting the noise gain by using the DVA, characterized in that for calculating the noise amount of the received signal in the frequency domain.
KR1020100120349A 2010-11-30 2010-11-30 Radar receiving apparatus for correcting noise gain using digital variable attenuator and method thereof KR101032300B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5507022A (en) * 1993-08-30 1996-04-09 Nec Corporation Electric field level detecting apparatus
KR0120726B1 (en) * 1994-12-23 1997-10-22 양승택 Noise figure balancing automatic measurement system of mobile communications receiver
JPH1041843A (en) * 1996-07-23 1998-02-13 Nec Corp Electric field detecting circuit
JP3028866B2 (en) 1991-07-23 2000-04-04 国際電気株式会社 Handset side tone control circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3028866B2 (en) 1991-07-23 2000-04-04 国際電気株式会社 Handset side tone control circuit
US5507022A (en) * 1993-08-30 1996-04-09 Nec Corporation Electric field level detecting apparatus
KR0120726B1 (en) * 1994-12-23 1997-10-22 양승택 Noise figure balancing automatic measurement system of mobile communications receiver
JPH1041843A (en) * 1996-07-23 1998-02-13 Nec Corp Electric field detecting circuit

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