WO2017183097A1 - レーダ装置 - Google Patents
レーダ装置 Download PDFInfo
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- WO2017183097A1 WO2017183097A1 PCT/JP2016/062327 JP2016062327W WO2017183097A1 WO 2017183097 A1 WO2017183097 A1 WO 2017183097A1 JP 2016062327 W JP2016062327 W JP 2016062327W WO 2017183097 A1 WO2017183097 A1 WO 2017183097A1
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- 230000005540 biological transmission Effects 0.000 claims abstract description 63
- 230000006835 compression Effects 0.000 claims abstract description 45
- 238000007906 compression Methods 0.000 claims abstract description 45
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- 230000015572 biosynthetic process Effects 0.000 claims abstract description 16
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 16
- 230000006870 function Effects 0.000 claims description 64
- 238000012545 processing Methods 0.000 claims description 54
- 238000001228 spectrum Methods 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 10
- 230000002194 synthesizing effect Effects 0.000 claims description 2
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- 238000007796 conventional method Methods 0.000 description 1
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Classifications
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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
- G01S13/343—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 using sawtooth modulation
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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
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
- G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
- G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
- G01S13/53—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi performing filtering on a single spectral line and associated with one or more range gates with a phase detector or a frequency mixer to extract the Doppler information, e.g. pulse Doppler radar
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
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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
- G01S13/26—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave
- G01S13/28—Systems for measuring distance only using transmission of interrupted, pulse modulated waves wherein the transmitted pulses use a frequency- or phase-modulated carrier wave with time compression of received pulses
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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
- G01S13/347—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 using more than one modulation frequency
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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
- G01S13/42—Simultaneous measurement of distance and other co-ordinates
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/904—SAR modes
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/292—Extracting wanted echo-signals
- G01S7/2923—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods
- G01S7/2927—Extracting wanted echo-signals based on data belonging to a number of consecutive radar periods by deriving and controlling a threshold value
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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
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
- G01S13/904—SAR modes
- G01S13/9047—Doppler beam sharpening mode
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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
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
- G01S7/288—Coherent receivers
- G01S7/2883—Coherent receivers using FFT processing
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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
- G01S7/352—Receivers
- G01S7/356—Receivers involving particularities of FFT processing
Definitions
- the present invention relates to a radar apparatus that identifies a target position from a delay time from when a radio wave is emitted until a target reflected wave is received and the arrival direction of the reflected radio wave.
- a transmitter generates a plurality of signals having different bands, transmits each signal from a transmission antenna, emits a radio wave, and receives a target reflected wave.
- a radar device that identifies the position of a target from the delay time until it arrives and the arrival direction of the reflected radio wave.
- the present invention has been made to solve such a problem, and an object of the present invention is to obtain a radar apparatus that can eliminate erroneous detection of a target due to an unnecessary peak.
- a radar apparatus includes a transmission unit that simultaneously transmits a plurality of radio waves having different bands from each antenna, a reception unit that receives a radio wave transmitted from the transmission unit and reflected by a target as a target reflected wave, and a reception unit Using the synthesis result of the synthesis processing unit and the synthesis processing unit that suppresses unnecessary peaks generated by the influence of leakage into other bands due to the Doppler frequency and the target reflected wave corresponding to each antenna received at And a detection processing unit for detecting a target.
- the radar apparatus synthesizes the target reflected wave by suppressing unnecessary peaks generated due to the influence of the Doppler frequency leaking into other bands. Thereby, the erroneous detection of the target resulting from an unnecessary peak can be eliminated.
- FIG. 1 is a configuration diagram of a radar apparatus according to the present embodiment.
- the radar apparatus according to the present embodiment includes transmitters 1- # 1 to 1- # M, transmission antennas 2- # 1 to 2- # M, and transmission side A / D converters 3- # 1 to 3- # M, receiving antennas 4- # 1 to 4- # L, receivers 5- # 1 to 5- # L, receiving side A / D converters 6- # 1 to 6- # L, pulse compression unit 7 -# 1-7- # L, transmission DBF (Digital Beam Forming) unit 8- # 1-8- # L, reception DBF unit 9, and target detection unit 10.
- transmitters 1- # 1 to 1- # M the radar apparatus according to the present embodiment includes transmitters 1- # 1 to 1- # M, transmission antennas 2- # 1 to 2- # M, and transmission side A / D converters 3- # 1 to 3- # M, receiving antennas 4- # 1 to 4- # L, receivers 5- # 1 to 5- # L, receiving side A / D converters 6- # 1 to 6- # L, pulse compression unit 7 -# 1-7- #
- Transmitters 1- # 1 to 1- # M are transmitters that generate signals subjected to linear FM modulation, and M (M ⁇ 2) are provided. Transmit antennas 2- # 1 to 2- # M are provided corresponding to transmitters 1- # 1 to 1- # M, and transmit signals generated by transmitters 1- # 1 to 1- # M, respectively. It is an antenna to do.
- the transmission side A / D converters 3- # 1 to 3- # M are A / D converters that convert a transmission signal, which is an analog signal, into a digital signal.
- the receiving antennas 4- # 1 to 4- # L are antennas for receiving radio waves transmitted from the transmitting antennas 2- # 1 to 2- # M and reflected to the target, and L (L ⁇ 2) antennas are received. Is provided.
- Receivers 5- # 1 to 5- # L are receivers that perform band limitation and phase detection on radio waves received by reception antennas 4- # 1 to 4- # L, respectively.
- Receiving side A / D converters 6- # 1 to 6- # L are A / D converters that convert the received signals, which are analog signals output from the receivers 5- # 1 to 5- # L, into digital signals. It is.
- the pulse compression units 7- # 1 to 7- # L are provided with the A / D conversion signals # 1 to #L from the reception side A / D converters 6- # 1 to 6- # L and the transmission side A / D conversion.
- This is a processing unit that performs pulse compression based on the reference signals # 1 to #M output from the devices 3- # 1 to 3- # M, which will be described later.
- the transmission DBF units 8- # 1 to 8- # L are processing units that form and combine transmission beams based on the signals compressed by the pulse compression units 7- # 1 to 7- # L.
- the unit 9 is a processing unit that combines the output signals of the transmission DBF units 8- # 1 to 8- # L with a reception beam.
- the target detection unit 10 is a processing unit that detects the direction and distance in which the target exists based on the output signal of the reception DBF unit 9. Further, a signal processing unit 11 is configured by the pulse compression units 7- # 1 to 7- # L to the target detection unit 10.
- the transmitters 1- # 1 to 1- # M, the transmission antennas 2- # 1 to 2- # M, and the transmission-side A / D converters 3- # 1 to 3- # M are connected to each other from each antenna.
- a transmitter is configured to transmit a plurality of radio waves having different values simultaneously.
- the receiving antennas 4- # 1 to 4- # L and the receivers 5- # 1 to 5- # L constitute a receiving unit that receives a radio wave transmitted from the transmitting unit and reflected to the target as a target reflected wave. ing.
- the receiving side A / D converters 6- # 1 to 6- # L, the pulse compression unit 7- # l, and the transmission DBF units 8- # 1 to 8- # L support each antenna received by the receiving unit.
- a synthesis processing unit is configured to synthesize the target reflected wave by suppressing unnecessary peaks generated due to the influence of leakage into other bands due to the Doppler frequency. Further, the reception DBF unit 9 and the target detection unit 10 constitute a detection processing unit that detects a target using the synthesis result of the synthesis processing unit.
- FIG. 2 is a block diagram showing the internal structure of the pulse compressor 7- # l (1 ⁇ l ⁇ L).
- the pulse compression unit 7- # l includes reception signal FET units 71- # 1 to 71- # M, reference signal FET units 72- # 1 to 72- # M, and multiplication circuits 73- # 1 to 73. -#M, complex window function multiplication circuits 74- # 1 to 74- # M, and IFFT units 75- # 1 to 75- # M.
- the reception signal FET units 71- # 1 to 71- # M perform FFT (Fast Fourier Transform) processing on the A / D conversion signal #l from the reception side A / D converter 6- # l.
- FFT Fast Fourier Transform
- the reference signal FET units 72- # 1 to 72- # M input the output signals of the transmission side A / D converters 3- # 1 to 3- # M as reference signals # 1 to #M, and the respective reference signals This is an arithmetic unit that performs FFT processing on # 1 to #M.
- the multiplication circuits 73- # 1 to 73- # M are complex conjugates of the output signals of the reference signal FET units 72- # 1 to 72- # M to the output signals of the reception signal FET units 71- # 1 to 71- # M. Is a multiplication circuit for multiplying.
- the complex window function multiplication circuits 74- # 1 to 74- # M form notches at positions of unnecessary peaks generated due to Doppler with respect to the output signals of the multiplication circuits 73- # 1 to 73- # M. It is a window function multiplication circuit which multiplies a window function.
- the IFFT units 75- # 1 to 75- # M are arithmetic units that perform IFFT (Inverse Fast Fourier Transform) processing on the output signals of the complex window function multiplying circuits 74- # 1 to 74- # M.
- FIG. 3 is a hardware configuration diagram of the signal processing unit 11 in which the signal processing unit 11 is configured as a signal processing board.
- the illustrated signal processing unit 11 is configured using, for example, an FPGA (Field-Programmable Gate Array) or the like, and includes a processor 111, a memory 112, and a display 113.
- the processor 111 performs pulse compression in the pulse compression unit 7- # 1, DBF processing in the transmission DBF units 8- # 1 to 8- # L, DBF processing in the reception DBF unit 9, and target detection processing in the target detection unit 10. It is.
- the memory 112 is a storage unit for storing a program for realizing the pulse compression unit 7-# 1 to the target detection unit 10 and for use as a work area of the signal processing unit 11.
- the display device 113 is a display device for displaying the processing result of the processor 111.
- the functions of the pulse compression unit 7- # 1 to the target detection unit 10 are realized by the processor 111 executing the program stored in the memory 112.
- FIG. 4 is a flowchart showing the operation of the radar apparatus according to the first embodiment.
- Pulsed transmission waves are transmitted by the transmitter 1- # m (1 ⁇ m ⁇ M) and the transmission antenna 2- # m (step ST1).
- the transmission wave is also transmitted to the transmission side A / D converter 3- # m, and the reference signal-# m is output (step ST2).
- FIG. 5 shows frequency modulation of radio waves generated by the transmitters 1- # 1 to 1- # M. Dividing the transmission band into M, transmitter 1- # m generates a transmission wave subjected to linear FM modulation using the mth band.
- a transmission wave is transmitted from the transmission antenna 2- # m. Further, a broken line 501 in FIG.
- an arrow 502 indicates the Doppler frequency.
- a plurality of uncorrelated radio waves are transmitted from the plurality of transmission antennas 2- # 1 to 2- # M, but the transmission bands of the respective transmitters 1- # 1 to 1- # M are slightly different.
- the radio waves that overlap, that is, have a small correlation with each other may be transmitted.
- the transmission wave is reflected by the target and received by reception antenna 4- # 1 to reception antenna 4- # L (step ST3).
- Radio waves received by the receiving antenna 4- # l (1 ⁇ l ⁇ L) are subjected to band limitation and phase detection by the receiver 5- # l, and then transmitted to the receiving A / D converter 6- # l Is done.
- the receiving side A / D converter 6- # l converts the output signal of the receiver 5- # l into a digital signal.
- An A / D conversion signal #l that is an output signal of the reception-side A / D converter 6- # l is transmitted to the reception signal FET units 71- # 1 to 71- # M of the pulse compression unit 7- # l.
- Reception signal FET units 71- # 1 to 71- # M perform an FFT process on the reception signal to generate a reception signal spectrum (step ST4). This received spectrum is assumed to be x1 , m, 1 , ..., xl, m, N.
- the reference signal #m (1 ⁇ m ⁇ M) is transmitted to the reference signal FET units 72- # 1 to 72- # M.
- the reference signal #m is subjected to FFT processing to generate a reference signal spectrum.
- this reference signal spectrum be ym , 1 , ..., ym , N.
- These received signal spectrums x l, m, 1 ,..., X l, m, N and reference signal spectrums ym , 1 ,..., Y m, N are transmitted to the multiplier circuits 73- # 1 to 73- # M. .
- the complex conjugate of the received signal spectrum and the reference signal spectrum is multiplied to generate compressed signal spectra z l, m, 1 ,..., Z l, m, N (steps). ST5).
- * represents a complex conjugate.
- the complex window function multiplier circuit 74- # 1 ⁇ 74- # M, the complex window function w m, 1 ... w m, the complex window function multiplied signal by multiplying the N to the compressed signal spectrum w m, 1zl, m , 1 ,... W m, Nzl, m, N are output (step ST6).
- the complex window function w m, 1 ... W m, N is calculated as an element of the vector w m calculated by the following equation (2).
- 1 represents a 1-row N-column vector with all elements being 1
- I represents a unit vector of N-rows and N-columns
- ⁇ (t) represents a weight obtained by increasing a time domain coefficient corresponding to the pulse width.
- FIG. 6 shows the relationship between the pulse width and the suppression region.
- the suppression region corresponds to a region where the side lobe increases due to cross-correlation. That is, when pulse compression is performed, as shown by a broken line 501 in FIG. 5, an unnecessary peak in which side lobes are increased due to cross-correlation occurs due to leakage due to the influence of the Doppler frequency 502 from an adjacent band. Therefore, a complex window function w m, 1 ...
- W m, N that forms a notch in this unnecessary peak region is created to suppress side lobes that have risen due to cross-correlation.
- the notch width and depth are controlled by the width of the suppression region shown in FIG. 6 and the parameter ⁇ in equation (2). Further, x ′ m, 1 ,..., X ′ m, N represents a received signal created in a pseudo manner.
- Complex window function multiplication signals w m, 1 zl, m, 1 ,... W m, Nzl, m, N output from the complex window function multiplication circuits 74- # 1 to 74- # M are IFFT units 75- # 1-75. -Is transmitted to #M.
- the complex window function multiplication signals w m, 1zl, m, 1 ,... W m, Nzl, m, N are subjected to IFFT processing, and the pulse compression signals ⁇ l, m, 1 ,..., ⁇ l, m, N are generated (step ST7).
- the number n of ⁇ l, m, n represents the range bin number in units of distance resolution determined from the transmission bandwidth B or the like.
- Pulse compression signals ⁇ l, m, 1 ,..., ⁇ l, m, N are transmitted to transmission DBF unit 8- # l.
- the transmission DBF unit 8- # l calculates the phase correction amounts ⁇ 1 ( ⁇ ) to ⁇ M ( ⁇ ) corresponding to the assumed radio wave arrival direction ⁇ and transmission antenna position, and combines the signal g by the following equation (3): l, n ( ⁇ ) is calculated (step ST8).
- Transmission DBF signal g l, n ( ⁇ ) from transmission DBF unit 8- # l is transmitted to reception DBF unit 9.
- the reception DBF unit 9 calculates phase correction amounts ⁇ 1 ( ⁇ ) to ⁇ L ( ⁇ ) corresponding to the radio wave arrival direction ⁇ and the reception antenna position, and combines the signal h n ( ⁇ ) by the following equation (4). Is calculated (step ST9).
- a reception DBF signal h n ( ⁇ ) from the reception DBF unit 9 is transmitted to the target detection unit 10.
- the target detection unit 10 compares the absolute value
- the use of the window function that forms a notch at a position corresponding to the pulse width away from the main lobe can suppress unnecessary peaks caused by Doppler, and erroneous detection of a target. Can be eliminated.
- a transmission unit that simultaneously transmits a plurality of radio waves having different bands from each antenna, and a radio wave that is transmitted from the transmission unit and reflected by the target is a target reflected wave.
- a receiving unit that receives the target reflected wave corresponding to each antenna received by the receiving unit, and a synthesis processing unit that combines and suppresses unnecessary peaks that occur due to the influence of leakage into other bands due to the Doppler frequency, Since the detection processing unit that detects the target using the synthesis result of the synthesis processing unit is provided, erroneous detection of the target due to an unnecessary peak can be eliminated.
- the transmission unit includes M (M ⁇ 2) transmitters that generate signals having waveforms subjected to linear frequency modulation in different bands, and M transmissions.
- the receiving unit limits the bandwidth to the radio waves received by the L (L ⁇ 2) reception antennas that receive the radio waves reflected by the target and the L reception antennas. Since it is configured to include L receivers that perform phase detection, it is possible to provide a receiver for eliminating erroneous detection of a target due to an unnecessary peak.
- the synthesis processing unit includes L reception-side A / D converters that convert the output signal of the reception unit into digital signals, and L reception-side A / D conversions.
- L pulse compression units that perform pulse compression by suppressing unnecessary peaks using the output signals of the transmitters and the output signals of the M transmission side A / D converters, and the mutual generated by the M transmitters Since it is composed of L transmission DBF units for synthesizing output signals of L pulse compression units related to signals in different bands, a synthesis processing unit for eliminating erroneous detection of a target due to an unnecessary peak Can be provided.
- the detection processing unit combines the output signals of the L transmission DBF units with the reception DBF unit, and the noise is the target signal with respect to the output signal of the reception DBF unit. Since it is composed of a target detection unit that detects a target using a threshold set based on a false alarm probability that is erroneously determined, a detection processing unit for eliminating erroneous detection of a target due to an unnecessary peak Can be provided.
- the L pulse compression units each perform M transform processing on the output signal of the receiving A / D converter to generate a received signal spectrum.
- FIG. FIG. 7 is a configuration diagram of the radar apparatus according to the second embodiment.
- the radar apparatus according to the second embodiment includes transmitters 1- # 1 to 1- # M, transmission antennas 2- # 1 to 2- # M, transmission side A / D converters 3- # 1 to 3- # M, Receiving antennas 4- # 1 to 4- # L, receivers 5- # 1 to 5- # L, receiving side A / D converters 6- # 1 to 6- # L, speed-compatible pulse compression unit 7a- # 1-7a- # L, transmission DBF unit 8- # 1-8- # L, reception DBF unit 9, and target detection unit 10.
- the speed corresponding pulse compression units 7a- # 1 to 7a- # L in the signal processing unit 11a is the same as the first embodiment shown in FIG. The description is omitted.
- the speed-corresponding pulse compressors 7a- # 1 to 7a- # L are pulse compressors that suppress unnecessary peaks corresponding to the speed range.
- FIG. 8 shows the speed-corresponding pulse compressors 7a- # l (1 ⁇ 1). The internal structure of l ⁇ L) is shown.
- the difference from the pulse compression unit 7- # l of the first embodiment is that a complex corresponding to a speed range is substituted for the complex window function multiplication circuits 74- # 1 to 74- # M of the first embodiment.
- the window function multiplication circuits 76- # 1 to 76- # M are provided. Since other configurations are the same as those in FIG. 2, the same reference numerals are given to corresponding portions, and the description thereof is omitted.
- the speed range corresponding complex window function multiplication circuits 76- # 1 to 76- # M calculate window functions for forming notches at unnecessary peak positions assuming a plurality of target speeds, and multiply the window functions by the multiplication circuit 73.
- This is a window function multiplication circuit that multiplies the output signals of # 1 to 73- # M.
- the signal processing unit 11a is composed of a speed-compatible signal processing board.
- the hardware configuration for realizing the speed-compatible pulse compression units 7a- # 1 to 7a- # L to the target detection unit 10 is shown in FIG. Since the configuration is the same as that of the processor 111, the memory 112, and the display 113, the description thereof is omitted here.
- a pulsed transmission wave is transmitted by the transmitter 1- # m (1 ⁇ m ⁇ M) and the transmission antenna 2- # m. Subsequent operations from the receiving antenna 4- # 1 on the receiving side to the multiplying circuits 73- # 1 to 73- # M in the speed corresponding pulse compression unit 7a- # l are the same as those in the first embodiment.
- Compressed signal spectrums z l, m, 1 ,..., Z l, m, N from the multiplier circuits 73- # 1 to 73- # M are the speed range corresponding complex window function multiplier circuits 76- # 1 to 76- # M.
- the speed window corresponding complex window function multiplication circuits 76- # 1 to 76- # M multiply the compressed signal spectrum by the complex window functions w m, 1 ... W m, N.
- the complex window function w m, 1 ... W m, N is calculated as an element of the vector w m calculated by the following equation (5).
- signals y ′ m, 1 ,..., Y ′ m, N represent the received signal spectral components of the transmission antenna- # m component of the target reflected wave affected by Doppler.
- k is a parameter corresponding to a plurality of target speeds.
- Received signal spectrum affected by Doppler y 'm, 1, ..., y' m, N is, for example transmitter 1- # a reference signal outputted from the m u m, 1, ..., u m, the N simulation signal u and Doppler shift by the following equation (6) 'm, k, 1, ..., u' m, k, is determined by FFT generates N.
- ⁇ is a transmission wavelength
- v k is a k-th target speed among a plurality of target speeds
- ⁇ t is an A / D conversion (transmission side A / D converters 3- # 1 to 3- # M and The sampling intervals of the receiving side A / D converters 6- # 1 to 6- # L) are shown.
- the window function used in ST6 of the flowchart of the first embodiment is replaced with the window function calculated by the equation (5).
- the window function for forming a notch at a position corresponding to the pulse width away from the main lobe is calculated assuming a plurality of target speeds, so that the target speed range in which the unwanted peak suppression effect can be expected can be expanded. .
- each of the L pulse compression units performs a Fourier transform process on the output signal of the reception A / D converter to generate a reception signal spectrum.
- IFFT Since to be composed of the suppression effect of unwanted peaks can be widened speed range of the target can be expected.
- FIG. 9 is a configuration diagram of the radar apparatus according to the third embodiment.
- the radar apparatus according to Embodiment 3 includes transmitters 1- # 1 to 1- # M, transmission antennas 2- # 1 to 2- # M, transmission side A / D converters 3- # 1 to 3- # M, Receiving antennas 4- # 1 to 4- # L, receivers 5- # 1 to 5- # L, receiving side A / D converters 6- # 1 to 6- # L, sidelobe corresponding pulse compression unit 7b- # 1-7b- # L, transmission DBF unit 8- # 1-8- # L, reception DBF unit 9, and target detection unit 10.
- the sidelobe-compatible pulse compressors 7b- # 1 to 7b- # L it is the same as that of the first embodiment shown in FIG. Omitted.
- the side lobe-compatible pulse compression units 7b- # 1 to 7b- # L are pulse compression units that suppress unnecessary peaks in correspondence with side lobes
- FIG. 10 shows the internal configuration.
- the difference from the pulse compression unit 7- # l of the first embodiment is that instead of the complex window function multiplication circuits 74- # 1 to 74- # M of the first embodiment, the sidelobe-compatible complex
- the window function multiplication circuits 77- # 1 to 77- # M are provided, and the other configurations are the same as those in FIG. 2, so the corresponding parts are denoted by the same reference numerals and the description thereof is omitted.
- the side lobe-compatible complex window function multiplication circuits 77- # 1 to 77- # M calculate a window function that forms a notch at the position of the unwanted peak including the side lobe level, and this window function is multiplied by the multiplication circuit 73- #.
- This is a window function multiplication circuit for multiplying output signals 1 to 73- # M.
- the signal processing unit 11b is composed of a sidelobe-compatible signal processing board, and the hardware configuration for realizing the sidelobe-compatible pulse compression units 7b- # 1 to 7b- # L to the target detection unit 10 is shown in FIG.
- a pulsed transmission wave is transmitted by the transmitter 1- # m (1 ⁇ m ⁇ M) and the transmission antenna 2- # m. Subsequent operations from the receiving antenna 4- # l on the receiving side to the multiplying circuits 73- # 1 to 73- # M in the sidelobe-compatible pulse compressor 7b- # l are the same as those in the first embodiment.
- Compressed signal spectrums z l, m, 1 ,..., Z l, m, N from the multiplier circuits 73- # 1 to 73- # M are sidelobe-compatible complex window function multiplier circuits 77- # 1 to 77- # M.
- the side lobe-compatible complex window function multiplying circuits 77- # 1 to 77- # M multiply the compressed signal spectrum by the complex window functions w m, 1 ... W m, N.
- the complex window function w m, 1 ... W m, N is calculated as an element of the vector w m calculated by the following equation (7).
- 1 is a 1-row N-column vector with all elements being 1
- I is a N-by-N unit vector
- ⁇ ′ (t) is a time domain coefficient corresponding to the pulse width
- side The lobe level also represents a weight that can be adjusted.
- FIG. 11 shows the relationship between the pulse width and the suppression region.
- the side lobe level, the notch width and the depth are controlled by the parameters ⁇ ′ 0 and ⁇ ′ 1 in FIG. 11, the width of the suppression region, the pass bandwidth, and the parameter ⁇ in Expression (7). Further, x ′ m, 1 ,..., X ′ m, N represents a received signal created in a pseudo manner.
- the window function used in ST6 of the flowchart of the first embodiment is replaced with the window function calculated by the equation (7). For this reason, by calculating a window function that forms a notch at a position corresponding to the pulse width away from the main lobe in correspondence with the side lobe level, both side lobe level reduction and unnecessary peak suppression can be expected.
- each of the L pulse compression units generates a received signal spectrum by performing a Fourier transform process on the output signal of the receiving A / D converter.
- M received signal FFT units, M reference signal FFT units for generating a reference signal spectrum by performing a Fourier transform process on the output signal of the transmitting A / D converter, and M received signal FFT units M multiplier circuits for generating a compressed signal spectrum from the output signal and the output signals of the M reference signal FFT units, and a window function for forming a notch at the position of the unnecessary peak including the side lobe level is calculated.
- the radar apparatus relates to a configuration that eliminates erroneous detection of a target due to occurrence of unnecessary peaks caused by Doppler, and is suitable for use in a MIMO (Multi-Input-Multi-Output) radar or the like. Yes.
- MIMO Multi-Input-Multi-Output
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Abstract
Description
実施の形態1.
図1は、本実施の形態によるレーダ装置の構成図である。
本実施の形態によるレーダ装置は、図示のように、送信機1-#1~1-#M、送信アンテナ2-#1~2-#M、送信側A/D変換器3-#1~3-#M、受信アンテナ4-#1~4-#L、受信機5-#1~5-#L、受信側A/D変換器6-#1~6-#L、パルス圧縮部7-#1~7-#L、送信DBF(Digital Beam Forming)部8-#1~8-#L、受信DBF部9、目標検出部10を備える。
受信信号FET部71-#1~71-#Mは、受信側A/D変換器6-#lからのA/D変換信号#lに対してFFT(Fast Fourier Transform:高速フーリエ変換)処理を施すフーリエ変換部である。参照信号FET部72-#1~72-#Mは、送信側A/D変換器3-#1~3-#Mの出力信号を参照信号#1~#Mとして入力し、それぞれの参照信号#1~#Mに対してFFT処理を施す演算部である。
このように構成された信号処理部11では、プロセッサ111がメモリ112に格納されたプログラムを実行することにより、パルス圧縮部7-#l~目標検出部10の機能を実現する。
図4は、実施の形態1のレーダ装置の動作を示すフローチャートである。
送信機1-#m(1≦m≦M)と送信アンテナ2-#mでパルス状の送信波が送信される(ステップST1)。また、送信波は送信側A/D変換器3-#mにも伝達され、参照信号-#mが出力される(ステップST2)。図5は送信機1-#1~1-#Mで生成される電波の周波数変調を表している。送信帯域をM個に分割して送信機1-#mでは、m番目の帯域を用いてリニアFM変調の施された送信波を生成する。送信アンテナ2-#mから送信波が送信される。また、図5中の破線501はドップラ周波数の影響のある受信信号を示し、矢印502はドップラ周波数を示している。なお、ここで複数の送信アンテナ2-#1~2-#Mからは互いに無相関の複数の電波が送信されるが、それぞれの送信機1-#1~1-#Mの送信帯域が若干重複する、すなわち、互いに相関の小さい電波を送信するものであってもよい。
送信波は目標に反射して受信アンテナ4-#1~受信アンテナ4-#Lで受信される(ステップST3)。受信アンテナ4-#l(1≦l≦L)で受信された電波は受信機5-#lで帯域制限と位相検波が施された後、受信側A/D変換器6-#lに伝達される。受信側A/D変換器6-#lでは受信機5-#l出力信号をデジタル信号に変換する。
これら受信信号スペクトルxl,m,1,…,xl,m,Nと参照信号スペクトルym,1,…,ym,Nが乗算回路73-#1~73-#Mに伝達される。乗算回路73-#1~73-#Mでは、受信信号スペクトルと参照信号スペクトルの複素共役が乗算され、圧縮信号スペクトルzl,m,1,…,zl,m,Nを生成する(ステップST5)。次式(1)で*は複素共役を表している。
ここで、複素窓関数wm,1…wm,Nは次式(2)で算出されるベクトルwmの要素として算出される。式(2)で1は全ての要素が1の1行N列のベクトル、IはN行N列の単位ベクトル、ζ(t)はパルス幅相当の時間領域の係数を大きくした重みを表している。図6に、パルス幅と抑圧領域との関係を示す。抑圧領域が、相互相関によりサイドローブが上昇する領域に対応している。すなわち、パルス圧縮した場合、図5の破線501に示すように、隣接する帯域からのドップラ周波数502の影響による漏れ込みで、相互相関によりサイドローブが上昇した不要ピークが発生する。そこで、この不要ピークの領域にノッチを形成する複素窓関数wm,1…wm,Nを作成して、相互相関により上昇したサイドローブを抑圧する。ノッチ幅や深さは、図6に示す抑圧領域の幅や式(2)のパラメータρにより制御する。また、x’m,1,…,x’m,Nは疑似的に作成した受信信号を表している。
図7は実施の形態2のレーダ装置の構成図である。
実施の形態2のレーダ装置は、送信機1-#1~1-#M、送信アンテナ2-#1~2-#M、送信側A/D変換器3-#1~3-#M、受信アンテナ4-#1~4-#L、受信機5-#1~5-#L、受信側A/D変換器6-#1~6-#L、速度対応型パルス圧縮部7a-#1~7a-#L、送信DBF部8-#1~8-#L、受信DBF部9、目標検出部10を備える。ここで、信号処理部11aにおける速度対応型パルス圧縮部7a-#1~7a-#L以外は、図1に示した実施の形態1と同様であるため、対応する部分に同一符号を付してその説明を省略する。
図8において、実施の形態1のパルス圧縮部7-#lとの相違点は、実施の形態1の複素窓関数乗算回路74-#1~74-#Mに代えて、速度範囲対応型複素窓関数乗算回路76-#1~76-#Mを設けた点である。他の構成は図2と同様であるため、対応する部分に同一符号を付してその説明を省略する。
また、信号処理部11aは速度対応型信号処理ボードで構成されるが、速度対応型パルス圧縮部7a-#1~7a-#L~目標検出部10を実現するハードウェア構成は図3に示したプロセッサ111、メモリ112及び表示器113からなる構成と同様であるため、ここでの説明は省略する。
送信機1-#m(1≦m≦M)と送信アンテナ2-#mでパルス状の送信波が送信される。以降の受信側の受信アンテナ4-#lから速度対応型パルス圧縮部7a-#lにおける乗算回路73-#1~73-#Mまでの動作は実施の形態1と同様である。乗算回路73-#1~73-#Mからの圧縮信号スペクトルzl,m,1,…,zl,m,Nが速度範囲対応型複素窓関数乗算回路76-#1~76-#Mに伝達されると、速度範囲対応型複素窓関数乗算回路76-#1~76-#Mでは、複素窓関数wm,1…wm,Nを圧縮信号スペクトルに乗算する。複素窓関数wm,1…wm,Nは次式(5)で算出されるベクトルwmの要素として算出される。式(5)で信号y’m,1,…,y’m,Nはドップラの影響を受けた目標反射波の送信アンテナ-#m成分の受信信号スペクトル成分を表している。また、式(5)において、kが複数の目標速度に対応したパラメータである。
図9は実施の形態3のレーダ装置の構成図である。
実施の形態3のレーダ装置は、送信機1-#1~1-#M、送信アンテナ2-#1~2-#M、送信側A/D変換器3-#1~3-#M、受信アンテナ4-#1~4-#L、受信機5-#1~5-#L、受信側A/D変換器6-#1~6-#L、サイドローブ対応型パルス圧縮部7b-#1~7b-#L、送信DBF部8-#1~8-#L、受信DBF部9、目標検出部10を備える。ここで、サイドローブ対応型パルス圧縮部7b-#1~7b-#L以外は、図1に示した実施の形態1と同様であるため、対応する部分に同一符号を付してその説明を省略する。
図10において、実施の形態1のパルス圧縮部7-#lとの相違点は、実施の形態1の複素窓関数乗算回路74-#1~74-#Mに代えて、サイドローブ対応型複素窓関数乗算回路77-#1~77-#Mを設けた点であり、他の構成は図2と同様であるため、対応する部分に同一符号を付してその説明を省略する。
サイドローブ対応型複素窓関数乗算回路77-#1~77-#Mは、不要ピークの位置にノッチを形成する窓関数をサイドローブレベルを含めて算出し、この窓関数を乗算回路73-#1~73-#Mの出力信号に対して乗算する窓関数乗算回路である。
また、信号処理部11bはサイドローブ対応型信号処理ボードで構成されるが、サイドローブ対応型パルス圧縮部7b-#1~7b-#L~目標検出部10を実現するハードウェア構成は図3に示したプロセッサ111、メモリ112及び表示器113からなる構成と同様であるため、ここでの説明は省略する。
送信機1-#m(1≦m≦M)と送信アンテナ2-#mでパルス状の送信波が送信される。以降の受信側の受信アンテナ4-#lからサイドローブ対応型パルス圧縮部7b-#lにおける乗算回路73-#1~73-#Mまでの動作は実施の形態1と同様である。乗算回路73-#1~73-#Mからの圧縮信号スペクトルzl,m,1,…,zl,m,Nがサイドローブ対応型複素窓関数乗算回路77-#1~77-#Mに伝達されると、サイドローブ対応型複素窓関数乗算回路77-#1~77-#Mは、複素窓関数wm,1…wm,Nを圧縮信号スペクトルに乗算する。複素窓関数wm,1…wm,Nは次式(7)で算出されるベクトルwmの要素として算出される。式(7)で1は全ての要素が1の1行N列のベクトル、IはN行N列の単位ベクトル、ζ’(t)はパルス幅相当の時間領域の係数を大きくし、さらにサイドローブレベルも調節できる重みを表している。図11に、パルス幅と抑圧領域との関係を示す。サイドローブレベルとノッチ幅と深さは図11のパラメータζ’0とζ’1、抑圧領域の幅、通過帯域幅、式(7)のパラメータρにより制御する。また、x’m,1,…,x’m,Nは疑似的に作成した受信信号を表している。
Claims (8)
- 各アンテナから互いに帯域が異なる複数の電波を同時に送信する送信部と、
前記送信部から送信されて目標に反射した電波を目標反射波として受信する受信部と、
前記受信部で受信した前記各アンテナに対応した目標反射波を、ドップラ周波数による他の帯域への漏れこみの影響で発生する不要ピークを抑圧して合成する合成処理部と、
前記合成処理部の合成結果を用いて目標を検出する検出処理部とを備えたことを特徴とするレーダ装置。 - 前記送信部は、
互いに異なる帯域でリニア周波数変調の施された波形の信号を生成するM(M≧2)個の送信機と、
前記M個の送信機で生成された信号を電波として送信するM本の送信アンテナと、
前記M個の送信機で生成されたアナログ信号をデジタル信号に変換するM個の送信側A/D変換器とから構成されることを特徴とする請求項1記載のレーダ装置。 - 前記受信部は、
目標に反射した電波を受信するL(L≧2)本の受信アンテナと、
前記L本の受信アンテナで受信した電波に帯域制限及び位相検波を施すL個の受信機とから構成されることを特徴とする請求項1記載のレーダ装置。 - 前記合成処理部は、
前記受信部の出力信号をデジタル信号に変換するL個の受信側A/D変換器と、
前記L個の受信側A/D変換器の出力信号と前記M個の送信側A/D変換器の出力信号とを用いて前記不要ピークを抑圧してパルス圧縮を行うL個のパルス圧縮部と、
前記M個の送信機で生成された互いに異なる帯域の信号に関する前記L個のパルス圧縮部の出力信号を合成するL個の送信DBF部とから構成されることを特徴とする請求項2記載のレーダ装置。 - 前記検出処理部は、
前記L個の送信DBF部の出力信号を合成する受信DBF部と、
前記受信DBF部の出力信号に対して、雑音を目標信号と誤って判定する誤警報確率を基に設定したスレッショルドを用いて目標を検出する目標検出部とから構成されることを特徴とする請求項4記載のレーダ装置。 - 前記L個のパルス圧縮部は、それぞれ、
前記受信側A/D変換器の出力信号にフーリエ変換処理を施して受信信号スペクトルを生成するM個の受信信号FFT部と、
前記送信側A/D変換器の出力信号にフーリエ変換処理を施して参照信号スペクトルを生成するM個の参照信号FFT部と、
前記M個の受信信号FFT部の出力信号と前記M個の参照信号FFT部の出力信号から圧縮信号スペクトルを生成するM個の乗算回路と、
前記不要ピークの位置にノッチを形成する窓関数を前記M個の乗算回路の出力信号に乗算するM個の複素窓関数乗算回路と、
前記M個の複素窓関数乗算回路の出力信号に逆フーリエ変換処理を施すM個のIFFT部とから構成されることを特徴とする請求項4記載のレーダ装置。 - 前記L個のパルス圧縮部は、それぞれ、
前記受信側A/D変換器の出力信号にフーリエ変換処理を施して受信信号スペクトルを生成するM個の受信信号FFT部と、
前記送信側A/D変換器の出力信号にフーリエ変換処理を施して参照信号スペクトルを生成するM個の参照信号FFT部と、
前記M個の受信信号FFT部の出力信号と前記M個の参照信号FFT部の出力信号から圧縮信号スペクトルを生成するM個の乗算回路と、
前記不要ピークの位置にノッチを形成する窓関数を複数の目標速度を想定して算出し、当該窓関数を前記M個の乗算回路の出力信号に乗算するM個の速度範囲考慮型複素窓関数乗算回路と、
前記M個の速度範囲考慮型複素窓関数乗算回路の出力信号に逆フーリエ変換処理を施すM個のIFFT部とから構成されることを特徴とする請求項4記載のレーダ装置。 - 前記L個のパルス圧縮部は、それぞれ、
前記受信側A/D変換器の出力信号にフーリエ変換処理を施して受信信号スペクトルを生成するM個の受信信号FFT部と、
前記送信側A/D変換器の出力信号にフーリエ変換処理を施して参照信号スペクトルを生成するM個の参照信号FFT部と、
前記M個の受信信号FFT部の出力信号と前記M個の参照信号FFT部の出力信号から圧縮信号スペクトルを生成するM個の乗算回路と、
前記不要ピークの位置にノッチを形成する窓関数をサイドローブレベルを含めて算出し、当該窓関数を前記M個の乗算回路の出力信号に対して乗算するM個のサイドローブ考慮型複素窓関数乗算回路と、
前記M個のサイドローブ考慮型複素窓関数乗算回路の出力信号に逆フーリエ変換処理を施すM個のIFFT部とから構成されることを特徴とする請求項4記載のレーダ装置。
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