WO2015072426A1 - レーダー装置 - Google Patents
レーダー装置 Download PDFInfo
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- WO2015072426A1 WO2015072426A1 PCT/JP2014/079723 JP2014079723W WO2015072426A1 WO 2015072426 A1 WO2015072426 A1 WO 2015072426A1 JP 2014079723 W JP2014079723 W JP 2014079723W WO 2015072426 A1 WO2015072426 A1 WO 2015072426A1
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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
- G01S7/35—Details of non-pulse systems
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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
- G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
- G01S13/34—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated using transmission of continuous, frequency-modulated waves while heterodyning the received signal, or a signal derived therefrom, with a locally-generated signal related to the contemporaneously transmitted signal
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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
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4008—Means for monitoring or calibrating of parts of a radar system of transmitters
Definitions
- the present invention relates to an FMCW radar device.
- An FMCW radar device is a device that transmits a radio wave to a measurement target (measurement object) while sweeping a predetermined frequency within a predetermined sweep time, and measures a distance to the measurement object. is there.
- the FMCW radar device has the property that the radio wave speed affects the accuracy of measurement in its measurement principle.
- the speed of radio waves is affected by the relative permittivity of the propagation space. This is because when the relative permittivity is different, the speed of the radio wave in the radio wave propagation space is different. Therefore, in order to improve the measurement accuracy, the relative dielectric constant in the radio wave propagation space up to the object to be measured may be accurately measured in advance. Since the relative permittivity varies depending on the components and temperature in the radio wave propagation space, the relative permittivity may be measured in advance every time the distance to the object to be measured is measured. However, measuring the relative permittivity for each measurement decreases the measurement efficiency.
- an FMCW type liquid level measurement system that can perform measurement within a tolerance of measurement error within a variation range of a relative dielectric constant predicted in advance (see, for example, Patent Document 1).
- a voltage-controlled oscillator (hereinafter referred to as “VCO”) is used for the transmission system of the FMCW radar device.
- the VCO outputs a signal having a frequency corresponding to the input voltage value (control voltage value).
- the correlation between the input voltage value (control voltage value) and the frequency of the output signal (oscillation frequency) in the VCO is constant even when the environment changes. However, the above correlation may fluctuate due to the influence of the temperature environment in which the VCO is operated.
- the FMCW radar system measures the distance based on the frequency of the transmitted wave and the frequency of the reflected wave from the object to be measured, it is extremely important to maintain the transmitted frequency with high accuracy. Therefore, if the correlation (FV characteristic) between the oscillation frequency and the control voltage value in the VCO is disturbed, it causes a decrease in measurement accuracy.
- the radar device As a method of maintaining the FV characteristics of the VCO constant, the radar device is operated under a plurality of temperature environments, and the input voltage (control voltage) to the VCO is changed in time series while the oscillation frequency of the VCO is changed.
- a method of actually measuring and acquiring data indicating frequency vs. control voltage (frequency vs. voltage data) is known. In this method, measurement results obtained in advance in a plurality of temperature environments are converted into data. This data (frequency vs. control voltage data) is referred to as FV data.
- FV data frequency vs. control voltage data
- the optimum FV characteristics are used as appropriate in a plurality of temperature environments where the radar device may be operated. Such actual measurement work increases the number of work steps at the time of manufacturing, leading to an increase in manufacturing cost.
- the above correlation in the VCO may change over time.
- the linearity of the FV characteristics in the temperature environment may be disturbed during operation. Even in such a situation, it is desirable that the FV characteristics can be calibrated on the spot.
- the present invention provides a radar device that can automatically calibrate the FV characteristics of a VCO due to changes in temperature environment and changes over time from a plurality of viewpoints, and can maintain measurement accuracy continuously. For the purpose.
- the present invention relates to a radar device, a voltage controlled oscillator that outputs a signal at an oscillation frequency corresponding to an input voltage value, and a storage unit that stores the oscillation frequency and voltage data indicating the voltage value.
- a control unit that sequentially reads the voltage data from the storage unit, a digital-analog converter that converts the read voltage data into the voltage value and inputs the voltage value to the voltage controlled oscillator, and the voltage controlled oscillator
- a first data processing unit that calibrates the correlation between the voltage value and the oscillation frequency
- a second data processing unit that calibrates the correlation between input and output in the digital-analog converter
- V ⁇ a voltage data group generation unit that generates T data.
- the present invention it is possible to correct the linearity of the VCO due to a change in temperature environment or a secular change from a plurality of viewpoints and maintain a state in which high-precision measurement can be performed automatically and continuously.
- a radar apparatus 1 includes a CPU 11 that is a control unit, a digital-analog converter (hereinafter referred to as “DAC 12”), a VCO 13 that is a voltage-controlled oscillator, and a coupling circuit.
- DAC 12 digital-analog converter
- VCO 13 that is a voltage-controlled oscillator
- HYB 14 antenna 16, mixer 17, AGC 18, reception ADC 19, and correlation calibration unit 20.
- the CPU 11 is a processor that controls the operation of the radar device 1. A predetermined processing operation in the radar apparatus 1 is performed by a program module executed in the CPU 11. These program modules will be described later.
- VT data and FV data are stored in the memory 90 which is a storage unit included in the CPU 11.
- VT data is data for causing the VCO 13 to output a signal related to a sweep frequency having a predetermined frequency range.
- the VT data includes data relating to a control voltage for causing the VCO 13 to oscillate at a predetermined frequency.
- the FV data is data used to generate data related to the control voltage included in the VT data, and is data having a two-dimensional array structure that associates the control voltage and the oscillation frequency. Details of the VT data and the FV data will be described later.
- the radar apparatus 1 has two operation modes of “measurement mode” and “calibration mode”, and can operate by switching these plurality of operation modes at an appropriate timing.
- the CPU 11 reads out VT data stored in advance in the memory 90 based on a predetermined time control.
- This VT data is voltage data (Vd) based on the VT characteristic of the sweep frequency in the FMCW system.
- This voltage data (Vd) is read out based on predetermined operation timing control, is input to the DAC 12, and is converted into an analog voltage value Va (control voltage).
- this control voltage is input to the VCO 13, the VCO 13 oscillates and outputs a signal at a frequency corresponding to the voltage value Va.
- the voltage data (Vd) stored in the memory 90 is configured such that the control voltage input to the VCO 13 changes based on the VT characteristics as described above. Therefore, a continuous wave whose frequency changes without interruption along the time series is output from the VCO 13 at a frequency corresponding to this VT characteristic. This continuous wave is converted into a radio wave via the antenna 16 and transmitted toward the object to be measured. The radio wave reflected by the object to be measured is received via the antenna 16. Then, the distance to the object to be measured is measured by calculating the difference between the frequency of the transmitted wave and the frequency of the received wave. Details of the operation mode changing process for switching between the measurement mode and the calibration mode and the measurement process of the radar device 1 in the measurement mode will be described later.
- the correlation calibration unit 20 executes processing for generating FV data of the VCO 13. Further, processing for generating VT data is executed using the FV data generated by the correlation calibration unit 20. These processes further include a plurality of processes. First, in the process of generating FV data, a process of acquiring control voltage data (Vd) obtained by converting a control voltage value for causing the VCO 13 to oscillate at a predetermined frequency is executed. Further, after the control voltage data (Vd) is converted to the analog voltage (Va) through the DAC 12, it is output again as voltage data (Vd '), and a process of comparing Vd and Vd' is executed.
- Vd control voltage data
- a process of adjusting Vd so that Vd ′ becomes equal to Vd and calibrating the data for FV data using the adjusted Vd is executed.
- the process of generating the VT data the process of generating the frequency vs. control voltage data required for the sweep frequency is executed using the calibrated FV data. Further, processing for generating VT data is executed based on the generated frequency versus control voltage data.
- the correlation between the control voltage and the oscillation frequency in the VCO 13 is disturbed due to a change with time, it can be automatically calibrated to the correct correlation. That is, the correlation between the input and output of the VCO is maintained in a constant state. It also calibrates the correlation between input and output at the DAC 12. In the measurement mode, the measurement process is executed using the voltage data that has been calibrated in the calibration mode.
- the calibration mode in the radar apparatus 1 will be described in detail.
- the radar device 1 in the calibration mode includes a CPU 11, a DAC 12, a VCO 13, a control voltage adjustment unit 21, an ADC 22, a first update unit 23, a second update unit 24, and voltage data.
- the group generator 25, the first switch 26, and the second switch 27 operate mainly.
- the control voltage adjustment unit 21 executes a process for adjusting a control voltage for causing the VCO 13 to oscillate at a predetermined frequency.
- the control voltage adjusting unit 21 is notified of data indicating one oscillation frequency included in the FV data read from the memory 90.
- the control voltage adjustment unit 21 outputs a voltage value Va based on the notified frequency to the VCO 13.
- the VCO 13 oscillates at the predetermined frequency.
- the control voltage adjustment unit 21 adjusts the voltage value Va output to the VCO 13 so that the frequency oscillated by the VCO 13 is equal to the frequency notified from the CPU 11.
- the ADC 22 is an analog-digital converter, which converts the voltage value Va output from the control voltage adjustment unit 21 into voltage data Vd that is digital data and outputs the voltage data Vd.
- the ADC 22 converts the voltage value Va output from the DAC 12 into voltage data Vd and outputs the voltage data Vd.
- the first update unit 23, the second update unit 24, and the voltage data group generation unit 25 are program modules executed by the CPU 11.
- the first updating unit 23 is a first data processing unit, and uses the voltage data Vd satisfying a specific condition among the voltage data Vd output from the ADC 22 to obtain the voltage data Vd included in the FV data. Execute the update process.
- the second update unit 24 is a second data processing unit, and executes a process of adjusting and updating the updated voltage data Vd using a loop circuit configured by the DAC 12 and the ADC 22.
- the voltage data group generation unit 25 generates VT data from the FV data after the update process in the second update unit 24 is completed for all the voltage data Vd included in the FV data. Execute the process.
- the first switch 26 is a switch for switching the operation mode of the radar device 1.
- the first switch 26 is a switch for switching the connection of the input source to the VCO 13.
- the output of the DAC 12 is adjusted to the input of the VCO 13
- the control voltage is adjusted to the input of the VCO 13.
- the output of the unit 21 is switched to connect.
- the second switch 27 is a switch for switching the input source of the ADC 22.
- the output of the DAC 12 is connected to the input of the ADC 22, and when the processing in the first updating unit 23 is executed, the output of the control voltage adjusting unit 21 is connected to the input of the ADC 22. Switch to
- F-V data as shown in FIG. 3 (a) is constituted by a combination of the oscillation frequency F n, and the voltage data Vd n according to the value of the control voltage for oscillating at an oscillation frequency F n the VCO13 in VCO13
- the FV data is two-dimensional array data.
- n is 1 to 100, for example.
- the VT data is data generated based on voltage data (Vd 1 to Vd 100 ) included in the FV data.
- V-T data is one-dimensional array data composed of voltage data Vd m for oscillating the VCO13 sweep timing of predefined.
- the VT data is sequentially read and input to the VCO 13 by the time control of the CPU 11 in the measurement mode.
- m is, for example, 1 to 1024.
- the calibration mode process is started when a condition for switching the operation mode to the calibration mode is satisfied.
- the mode switching process by the CPU 11 is executed (S21). The “conditions for switching the operation mode” will be described later.
- the mode switching process (S21) is a process in which the CPU 11 switches the first switch 26.
- the mode switching process (S21) the first switch 26 is switched, and the output of the control voltage adjusting unit 21 is connected to the input of the VCO 13.
- the control voltage adjustment unit 21 outputs the voltage Va 1 to the VCO 13 so that the VCO 13 oscillates at the notified oscillation frequency F 1 (S23).
- the VCO 13 oscillates at a frequency corresponding to the voltage Va 1, and a signal of this frequency is looped back to the control voltage adjustment unit 21.
- the control voltage adjustment unit 21 adjusts the voltage Va 1 for the VCO 13 so that the frequency f of the output signal of the VCO 13 becomes the oscillation frequency F 1 .
- the control voltage adjusting unit 21 notifies the lock signal to the CPU 11 (S24).
- the CPU 11 switches the second switch 27 to connect the output of the control voltage adjustment unit 21 to the input of the ADC 22.
- the VCO13 oscillation process (S23)
- the voltage Va 1 the control voltage adjusting unit 21 outputs is input to ADC 22.
- the ADC 22 outputs voltage data Vd 1 corresponding to the input voltage Va 1 .
- the first updating unit 23 uses the voltage data Vd 1 when the lock signal is notified to update the voltage data Vd 1 included in the F-V data (S25).
- the second update process (S26) is executed.
- the CPU 11 switches the second switch 27 to connect the output of the DAC 12 to the input of the ADC 22. Further, the voltage data Vd 1 updated previously is input to the DAC 12. The voltage value Va 1 converted into an analog signal in the DAC 12 is input to the ADC 22 via the second switch 27, and digital conversion (reconversion) is performed again.
- the second updating unit 24 compares the voltage data Vd '1 after reconverted voltage data Vd 1, so that the voltage data Vd 1 and voltage data Vd' 1 becomes equal , adjusting the voltage data Vd 1. Repeat this adjustment process, by using the voltage data Vd 1 at the time when the voltage data Vd 1 and voltage data Vd '1 becomes equal, it updates the voltage data Vd 1 of F-V data (overwritten) to.
- the radar apparatus 1 keeps the correlation between the control voltage and the oscillation frequency in the VCO 13 constant, and keeps the correlation between the input and output in the DAC 12 constant.
- the linearity of the VT characteristic which may be lost due to fluctuations in temperature environment or changes with time, is accurately calibrated, and a state in which high-accuracy measurement can be performed can be automatically maintained.
- the calibration determination process (S1) is a process for determining whether or not a condition for switching to the calibration mode is satisfied.
- S2 a calibration process is executed (S2).
- the calibration process (S2) is the process already described with reference to FIG.
- the condition determined in the calibration determination process (S1) is, for example, whether or not the elapsed time from the time when the previously executed calibration process (S2) is finished reaches a predetermined time, or the radar device Whether or not the temperature variation measured by the temperature measurement mechanism included in 1 has exceeded a predetermined fluctuation range.
- the radar device 1 If the above determination criteria are not satisfied in the calibration determination process (S1) (No in S1), the radar device 1 operates in the measurement mode (S3).
- the processing operation of the radar apparatus 1 in the measurement mode will be described with reference to FIG.
- the CPU 11 switches the first switch 26 so that the output of the DAC 12 is connected to the input of the VCO 13.
- the FMCW (Frequency Modulated Continuous Wave) method employed by the radar apparatus 1 is subjected to a predetermined frequency while sweeping a predetermined frequency at a predetermined time (this time is referred to as a sweep time T).
- radio waves are transmitted toward the measurement object.
- the frequency of this transmission wave is called the sweep frequency F.
- t be the round-trip time until the transmitted radio wave is reflected and received by the measurement target.
- the sweep frequency F is swept by “F ⁇ t / T” until the round-trip time t elapses. That is, the frequency of the transmission wave at the time when the reflected wave is received changes by “F ⁇ t / T” from the frequency of the reflected wave. Therefore, the frequency of the mixed signal (hereinafter referred to as “beat signal”) obtained by mixing the reflected wave and the transmission wave at the time when the reflected wave is received (hereinafter referred to as “beat frequency F B ”) is the transmission wave. Is determined by the difference between the frequency (transmission frequency F T ) and the reflected wave frequency (reception frequency F R ).
- the measurement mode of the radar device 1 executed based on the above measurement principle is as follows. First, the measurement program stored in the CPU 11 sequentially reads out the VT data stored in the memory 90 at a predetermined timing in the time control.
- the read VT data is converted into an analog signal by the DAC 12.
- This analog signal becomes a control voltage input to the VCO 13.
- the VCO 13 Based on the control voltage, the VCO 13 outputs a signal having a predetermined frequency. Since the control voltage is continuously input to the VCO 13 along the time series, the oscillation frequency in the VCO 13 changes continuously. The frequency of this transmission wave is the sweep frequency F.
- This signal is converted into a transmission wave by the antenna 16 via the HYB 14 and transmitted to the device under test.
- the radio wave reflected by the measurement target is received by the antenna 16. This received wave is converted into a received signal and guided to the receiving system via the HYB 14.
- the reception signal and the oscillation signal at the time when the reception signal is received are mixed in the mixer 17.
- a beat signal having a frequency difference between the reception frequency and the transmission frequency is generated.
- the beat signal is controlled to an appropriate amplitude value by the AGC 18 and then converted to a digital signal by the receiving ADC 19 and input to the CPU 11 as an amplitude value.
- the CPU 11 executes processing for taking in the amplitude value of the beat signal from the reading of the VT data during the sweep time T. Filtering processing is performed on the beat signal amplitude value group which is time axis data captured during the sweep time T to remove unnecessary noise components, and then FFT (Fast Fourier Transform) processing is performed. These series of processing, the beat frequency F B is extracted.
- the radar device 1 that measures the distance by the FMCW method cannot accurately measure unless the voltage (control voltage) applied to the VCO 13 changes at a constant rate along the time series.
- the operation is automatically switched to the calibration mode when a predetermined condition is satisfied, and the correlation between the control voltage and the oscillation frequency in the VCO 13 is maintained constant. It is possible to perform a plurality of calibration processes that are necessary to do this. Thereby, the measurement process with high accuracy can be automatically maintained.
- the control voltage adjustment unit 21 includes a frequency divider 211, a reference oscillator 212, a phase comparator 213, and an LPF 214 that is a low-pass filter.
- the LPF 214 performs a filtering process on the output from the phase comparator 213 and outputs a voltage Va 1 that is a control voltage for the VCO 13. This voltage Va 1 is also input to the ADC 22.
- the oscillation frequency f based on the voltage Va 1 is looped back to the frequency divider 211, and the looped back frequency is frequency-divided and input to the phase comparator 213.
- the control voltage adjusting unit 21 notifies the CPU 11 of a lock signal (LOCK signal).
- control voltage adjustment unit 21 includes a frequency divider 211, a reference oscillator 212, a count comparator 215, and a control voltage generation unit 216.
- the counting comparator 215 counts the waveform input from the frequency divider 211 based on the clock supplied from the reference oscillator 212, and determines whether or not the coefficient value is larger than a specified value (reference coefficient value).
- the determination process is executed. In the determination result of this determination process, when the count value is larger than the specified value, the control voltage generator 216 is controlled to decrease the voltage Va 1 . On the other hand, when the count value is determined to be smaller than the specified value, increasing the voltage Va 1 by controlling the control voltage generator 216.
- the control voltage adjustment unit 21 notifies the CPU 11 of a lock signal.
- the radar apparatus 1 can automatically calibrate even if the VT characteristic of the voltage controlled oscillator used in the FMCW system is disturbed by a temporal factor or by an environmental factor. it can. Thereby, it is possible to automatically maintain a state in which a highly accurate measurement process can be performed. In addition, since it is not necessary to convert a large number of VT characteristics into data at the time of manufacturing, manufacturing cost can be reduced. Also, the maintenance cost can be reduced by automatically calibrating the VT characteristic during operation.
Abstract
Description
以下、本発明に係るレーダー装置の実施形態について、図面を参照しながら説明する。図1に示すように、本実施形態に係るレーダー装置1は、制御部であるCPU11と、デジタル-アナログ変換器(以下「DAC12」とする。)と、電圧制御発振器であるVCO13と、結合回路であるHYB14と、アンテナ16と、Mixer17と、AGC18と、受信用ADC19と、相関較正部20と、を有している。
次に、レーダー装置1における較正モードについて詳細に説明する。図2では、レーダー装置1が有する構成のうち、較正モードで動作するときに主に用いられる構成のみを示している。図2に示すように、較正モードのレーダー装置1は、CPU11と、DAC12と、VCO13と、制御電圧調整部21と、ADC22と、第1更新部23と、第2更新部24と、電圧データ群生成部25と、第1スイッチ26と、第2スイッチ27が、主に動作する。
次に、レーダー装置1の較正モードにおける動作について図4のフローチャートを用いて説明する。較正モードの処理は、動作モードを較正モードに切り替える条件が成立したときに開始される。まず、CPU11によるモード切替処理が実行される(S21)。なお、「動作モードを切り替える条件」については、後述する。
次に、レーダー装置1における動作モード切替処理等について説明する。図5に示すように、レーダー装置1の動作が開始されると、較正判定処理が実行される(S1)。較正判定処理(S1)は、較正モードへの切り替え条件が成立しているか否かを判定する処理である。条件が成立しているとき(S1のYes)、較正処理が実行される(S2)。較正処理(S2)は、図4を用いてすでに説明した処理である。
ここで、測定モードにおけるレーダー装置1の処理動作について図1を用いて説明する。測定モードでは、CPU11が第1スイッチ26を切り替えて、VCO13の入力にDAC12の出力が接続される状態にする。レーダー装置1が採用するFMCW(Frequency Modulated Continuous Wave)方式は、図6に示すように、予め決められた時間(この時間を掃引時間Tという。)において、予め決められた周波数を掃引しながら被測定物に向けて電波を送信する方式である。この送信波の周波数は、掃引周波数Fと呼ばれる。
次に、制御電圧調整部21の詳細な構造の例について説明する。図8に示すように制御電圧調整部21は、分周器211と、基準発振器212と、位相比較器213と、ローパスフィルタであるLPF214と、を有してなる。
次に、制御電圧調整部21の詳細な構造の別の例について説明する。図9に示すように制御電圧調整部21は、分周器211と、基準発振器212と、計数比較器215と、制御電圧生成部216と、を有してなる。
11 CPU
12 DAC
13 VCO
21 制御電圧調製部
22 ADC
23 第1更新部
24 第2更新部
25 電圧データ群生成部
26 第1スイッチ
27 第2スイッチ
Claims (5)
- 入力される電圧値に応じた発振周波数において信号を出力する電圧制御発振器と、
前記発振周波数と前記電圧値を示す電圧データとを記憶する記憶部と、
前記記憶部から前記電圧データを順次読み出す制御部と、
読み出された前記電圧データを前記電圧値に変換して前記電圧制御発振器に入力するデジタル-アナログ変換器と、
前記電圧制御発振器における前記電圧値と前記発振周波数との相関を較正する第1データ処理部と、
前記デジタル-アナログ変換器における入力と出力の相関を較正する第2データ処理部と、
較正された電圧データ群からV-Tデータを生成する電圧データ群生成部と、
を有することを特徴とするレーダー装置。 - 前記第1データ処理部は、
前記電圧データが示す電圧値を入力したときの前記電圧制御発振器における発振周波数が、当該電圧データに係る発振周波数と同等になるように電圧値を調整して出力する制御電圧調整部と、
前記調整された電圧値をデジタルデータに変換して出力するアナログ-デジタル変換器と、
前記アナログ-デジタル変換器から出力されるデジタルデータを用いて前記電圧データを更新する第1更新部と、
を有し、
前記第2データ処理部は、
前記デジタル-アナログ変換器において更新された前記電圧データを、アナログ信号に変換した後に前記アナログ-デジタル変換器において再変換をして得たデータを用いて更新する第2更新部を有し、
前記電圧データ群生成部は、
前記更新された電圧データから前記電圧制御発振器への入力に用いる電圧データを生成する第1生成部と、
前記生成された電圧データに基づいて電圧データ群を生成する第2生成部と、
を有する、
請求項1記載のレーダー装置。 - 前記電圧制御発振器の入力を、前記デジタル-アナログ変換器の出力または前記第1データ処理部の出力のいずれかに切り替える第1スイッチと、
前記アナログ-デジタル変換器の入力を、前記デジタル-アナログ変換器の出力または前記第1データ処理部の出力のいずれかに替える第2スイッチと、
を有する、
請求項2記載のレーダー装置。 - 前記第1データ処理部と前記第2データ処理部は、前記制御部における動作タイミング制御が制御される、
請求項1乃至3のいずれかに記載のレーダー装置。 - 前記制御電圧調整部は、前記電圧制御発振器と、位相比較器と、分周器と、基準発振器と、を有し、
前記電圧制御発振器の発振周波数が前記電圧データに係る発振周波数と同等になったときにロック信号を前記制御部に通知する、
請求項2乃至4のいずれかに記載のレーダー装置。
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JPS6396582A (ja) * | 1986-10-14 | 1988-04-27 | Mitsubishi Electric Corp | マイクロ波レベル計 |
JPH0755924A (ja) * | 1993-08-11 | 1995-03-03 | Daikin Ind Ltd | Fmcwレーダの送信波生成方法およびfmcwレーダ |
JPH09119977A (ja) * | 1995-08-25 | 1997-05-06 | Krohne Messtech Gmbh & Co Kg | 液体の充填レベル測定方法 |
JP2007298317A (ja) * | 2006-04-28 | 2007-11-15 | Fujitsu Ltd | 周波数変調回路及びfm−cwレーダ装置並びに通信統合レーダ装置 |
JP4605157B2 (ja) * | 2004-02-25 | 2011-01-05 | 三菱電機株式会社 | 波形生成方法、レーダ装置及びレーダ装置用発振装置 |
WO2012031684A1 (de) * | 2010-08-22 | 2012-03-15 | Krohne Messtechnik Gmbh | Schaltungsanordnung zur erzeugung von eine breitbandige frequenzrampe bildenden hochfrequenten ausgangssignalen |
JP2013217854A (ja) * | 2012-04-11 | 2013-10-24 | Mitsubishi Electric Corp | 周波数変調発振源およびレーダ装置 |
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JPS6396582A (ja) * | 1986-10-14 | 1988-04-27 | Mitsubishi Electric Corp | マイクロ波レベル計 |
JPH0755924A (ja) * | 1993-08-11 | 1995-03-03 | Daikin Ind Ltd | Fmcwレーダの送信波生成方法およびfmcwレーダ |
JPH09119977A (ja) * | 1995-08-25 | 1997-05-06 | Krohne Messtech Gmbh & Co Kg | 液体の充填レベル測定方法 |
JP4605157B2 (ja) * | 2004-02-25 | 2011-01-05 | 三菱電機株式会社 | 波形生成方法、レーダ装置及びレーダ装置用発振装置 |
JP2007298317A (ja) * | 2006-04-28 | 2007-11-15 | Fujitsu Ltd | 周波数変調回路及びfm−cwレーダ装置並びに通信統合レーダ装置 |
WO2012031684A1 (de) * | 2010-08-22 | 2012-03-15 | Krohne Messtechnik Gmbh | Schaltungsanordnung zur erzeugung von eine breitbandige frequenzrampe bildenden hochfrequenten ausgangssignalen |
JP2013217854A (ja) * | 2012-04-11 | 2013-10-24 | Mitsubishi Electric Corp | 周波数変調発振源およびレーダ装置 |
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