WO2021214960A1 - Dispositif de génération de signal, procédé de génération de signal et programme de génération de signal - Google Patents

Dispositif de génération de signal, procédé de génération de signal et programme de génération de signal Download PDF

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Publication number
WO2021214960A1
WO2021214960A1 PCT/JP2020/017602 JP2020017602W WO2021214960A1 WO 2021214960 A1 WO2021214960 A1 WO 2021214960A1 JP 2020017602 W JP2020017602 W JP 2020017602W WO 2021214960 A1 WO2021214960 A1 WO 2021214960A1
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frequency
time response
pulse
signal generation
linear
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PCT/JP2020/017602
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English (en)
Japanese (ja)
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智也 山岡
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三菱電機株式会社
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Priority to PCT/JP2020/017602 priority Critical patent/WO2021214960A1/fr
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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

Definitions

  • the present disclosure relates to a signal generator, a signal generation method, and a signal generation program that generate a non-linear chirped pulse.
  • a radar device that uses a chirped pulse as a radar signal. If the side lobe of the chirped pulse can be reduced, the target detection performance in the radar device can be improved.
  • a chirped pulse with reduced side lobes there is a non-linear chirped pulse in which the frequency power distribution is biased.
  • the non-linear chirped pulse needs to be sampled at equal time intervals in practical use. In order to generate a nonlinear chirped pulse sampled at equal time intervals, it is necessary to determine the time response of the phase in the nonlinear chirped pulse.
  • Non-Patent Document 1 discloses a method of approximating the time response of a phase in a nonlinear chirped pulse by a polynomial having a Taylor weight.
  • Non-Patent Document 1 since the time response of the phase in the nonlinear charp pulse is approximated by a polynomial, an error is included in the time response of the phase. There is a problem that the signal waveform of the nonlinear chirped pulse is deteriorated due to the inclusion of an error in the time response of the phase.
  • the present disclosure has been made to solve the above-mentioned problems, and is a signal generator and a signal capable of preventing deterioration of the signal waveform of a non-linear chap pulse due to an error in the time response of the phase.
  • the purpose is to obtain a generation method and a signal generation program.
  • the signal generator includes a time response calculation unit and a time response calculation unit that calculate the time response of the frequency in the non-linear chirp pulse by using the power characteristic of the frequency in the non-linear chirp pulse having a bias in the power distribution of the frequency. Using the time response of the frequency calculated by To prepare.
  • FIG. 5 is a hardware configuration diagram of a computer when the signal generator 1 is realized by software, firmware, or the like. It is a flowchart which shows the signal generation method which is the processing procedure of the signal generation apparatus 1 which concerns on Embodiment 1.
  • FIG. It is explanatory drawing which shows the time frequency characteristic of the radar signal s (m) generated by the signal generation unit 13. It is explanatory drawing which shows the electric power characteristic on the frequency in the radar signal s (m) generated by the signal generation unit 13.
  • FIGS. 8A and 8B are explanatory diagram showing an example of a window function W (f (m)) having a single peak shape.
  • FIGS. 9A and 9B is an explanatory diagram showing an example of a window function W (f (m)) having a compound peak shape.
  • FIG. It is a hardware block diagram which shows the hardware of the signal generation apparatus 1 which concerns on Embodiment 2.
  • FIG. It is explanatory drawing which shows an example of the function R (f). It is explanatory drawing which shows the time ⁇ T n required for the frequency transition, and the frequency change amount ⁇ F n.
  • FIG. 1 is a configuration diagram showing a radar system including the signal generation device 1 according to the first embodiment.
  • FIG. 2 is a hardware configuration diagram showing the hardware of the signal generation device 1 according to the first embodiment.
  • the radar system includes a signal generation device 1, a storage unit 2, a radar signal processing unit 3, a radar unit 4, and a display unit 5.
  • the signal generation device 1 generates a non-linear chirped pulse and outputs the non-linear chirped pulse as a radar signal to the storage unit 2.
  • the storage unit 2 is realized by, for example, a storage processing circuit.
  • the storage unit 2 stores each of the window function, the radar signal generated by the signal generation device 1, and the display data generated by the radar signal processing unit 3.
  • the storage processing circuit includes, for example, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Flexible Memory), an EEPROM (Electrically Flexible Memory), or the like.
  • a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD (Digital Versaille Disc) is applicable.
  • the radar signal processing unit 3 outputs the radar signal stored in the storage unit 2 to the radar unit 4, and acquires the received signal output from the radar unit 4.
  • the radar signal processing unit 3 uses each of the radar signal and the received signal to perform target detection processing, synthetic aperture radar image generation processing, and the like.
  • the radar signal processing unit 3 generates display data for displaying the target detection processing result or display data for displaying the synthetic aperture radar image, and outputs the generated display data to the storage unit 2.
  • the radar unit 4 radiates radio waves related to the radar signal output from the radar signal processing unit 3 into space, and receives the radio waves reflected by the target.
  • the radar unit 4 outputs a radio wave reception signal to the radar signal processing unit 3.
  • the display unit 5 includes, for example, a liquid crystal display.
  • the display unit 5 displays the target detection processing result or the synthetic aperture radar image on the liquid crystal display according to the display data stored in the storage unit 2.
  • the signal generation device 1 includes an initial value setting unit 11, a time response calculation unit 12, and a signal generation unit 13.
  • the initial value setting unit 11 is realized by, for example, the initial value setting circuit 31 shown in FIG.
  • the internal memory of the initial value setting unit 11 stores each of the frequency bandwidth B of the non-linear charp pulse, the pulse time width T of the non-linear charp pulse, and the oversampling rate ⁇ as design specifications.
  • the initial value setting unit 11 sets the sampling interval Dt of the nonlinear chirped pulse from the frequency bandwidth B and the oversampling rate ⁇ .
  • the initial value setting unit 11 sets a provisional chirp rate ⁇ 0 from the frequency bandwidth B and the pulse time width T.
  • the initial value setting unit 11 outputs each of the sampling interval Dt and the provisional chirp rate ⁇ 0 to the time response calculation unit 12.
  • the internal memory of the initial value setting unit 11 stores each of the frequency bandwidth B, the pulse time width T, and the oversampling rate ⁇ .
  • each of the frequency bandwidth B, the pulse time width T, and the oversampling rate ⁇ may be given from the outside of the signal generation device 1.
  • the time response calculation unit 12 is realized by, for example, the time response calculation circuit 32 shown in FIG.
  • the time response calculation unit 12 calculates the frequency f (m) at the sampling time m ⁇ Dt as the time response of the frequency in the nonlinear charp pulse by using the power characteristic of the frequency in the nonlinear charp pulse.
  • m is an integer within the range of M 0 ⁇ m ⁇ M 1.
  • M 0 and M 1 is an integer. That is, the time response calculation unit 12 acquires each of the sampling interval Dt output from the initial value setting unit 11 and the provisional charp rate ⁇ 0 , and is stored by the window function holding unit 21 of the storage unit 2. W (f (m)) is acquired.
  • the window function W (f (m)) shows the power characteristic of the frequency f (m) in the nonlinear chirped pulse in which the power distribution of the frequency is biased. Then, the time response calculation unit 12 uses each of the provisional chirp rate ⁇ 0 and the window function W (f (m)) to determine the amount of change Df (m) of the frequency changing during the sampling interval Dt. calculate. Then, the time response calculation unit 12 calculates the frequency f (m) at the sampling time m ⁇ Dt as the time response of the frequency in the non-linear chap pulse from the frequency change amount Df (m). The time response calculation unit 12 outputs each of the frequency f (m) and the sampling interval Dt at the sampling time m ⁇ Dt to the signal generation unit 13.
  • the signal generation unit 13 is realized by, for example, the signal generation circuit 33 shown in FIG.
  • the signal generation unit 13 calculates the time response p (m) of the phase in the nonlinear charp pulse by using the time response of the frequency calculated by the time response calculation unit 12 and the sampling interval Dt of the nonlinear charp pulse.
  • the phase time response p (m) is calculated for each sampling time m ⁇ Dt.
  • the signal generation unit 13 generates a non-linear chirped pulse having a phase time response p (m) as a radar signal s (m).
  • the signal generation unit 13 outputs the generated nonlinear chirped pulse as a radar signal s (m) to the radar signal holding unit 22 of the storage unit 2.
  • the storage unit 2 includes a window function holding unit 21, a radar signal holding unit 22, and a display data holding unit 23.
  • the window function holding unit 21 stores the window function W (f).
  • the radar signal holding unit 22 stores the radar signal s (m) generated by the signal generating unit 13.
  • the display data holding unit 23 stores the display data generated by the radar signal processing unit 3.
  • each of the initial value setting unit 11, the time response calculation unit 12, and the signal generation unit 13, which are the components of the signal generation device 1, is realized by dedicated hardware as shown in FIG. doing. That is, it is assumed that the signal generation device 1 is realized by the initial value setting circuit 31, the time response calculation circuit 32, and the signal generation circuit 33.
  • Each of the initial value setting circuit 31, the time response calculation circuit 32, and the signal generation circuit 33 includes, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), and an FPGA (FPGA). Field-Programmable Gate Array) or a combination of these is applicable.
  • the components of the signal generator 1 are not limited to those realized by dedicated hardware, but the signal generator 1 is realized by software, firmware, or a combination of software and firmware. It is also good.
  • the software or firmware is stored as a program in the memory of the computer.
  • a computer means hardware that executes a program, and corresponds to, for example, a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, or a DSP (Digital Signal Processor). do.
  • FIG. 3 is a hardware configuration diagram of a computer when the signal generation device 1 is realized by software, firmware, or the like.
  • a program for causing a computer to execute each processing procedure in the initial value setting unit 11, the time response calculation unit 12, and the signal generation unit 13 is stored in the memory 41. Will be done.
  • the processor 42 of the computer executes the program stored in the memory 41.
  • FIG. 2 shows an example in which each of the components of the signal generation device 1 is realized by dedicated hardware
  • FIG. 3 shows an example in which the signal generation device 1 is realized by software, firmware, or the like. ..
  • this is only an example, and some components in the signal generation device 1 may be realized by dedicated hardware, and the remaining components may be realized by software, firmware, or the like.
  • FIG. 4 is a flowchart showing a signal generation method which is a processing procedure of the signal generation device 1 according to the first embodiment.
  • the initial value setting unit 11 sets the sampling interval Dt of the nonlinear chirped pulse from the frequency bandwidth B of the nonlinear chirped pulse and the oversampling rate ⁇ (step of FIG. 4). ST1). As shown in the following equation (2), the initial value setting unit 11 sets a provisional chirp rate ⁇ 0 from the frequency bandwidth B of the nonlinear chirp pulse and the pulse time width T of the nonlinear chirp pulse (FIG. Step 4 ST1). The initial value setting unit 11 outputs each of the sampling interval Dt and the provisional chirp rate ⁇ 0 to the time response calculation unit 12.
  • the time response calculation unit 12 acquires each of the sampling interval Dt output from the initial value setting unit 11 and the provisional charp rate ⁇ 0 , and the window function W (f (m)) stored by the window function holding unit 21. ) To get.
  • the window function W (f (m)) shows the power characteristic of the frequency f (m) in the nonlinear chirped pulse in which the power distribution of the frequency is biased.
  • the signal generator 1 shown in FIG. 1 is premised on an equivalent low frequency system in which the center frequency of the frequency f (m) is 0 [Hz].
  • the band of the frequency f (m) is ⁇ B / 2 ⁇ f (m) ⁇ B / 2.
  • the time response calculation unit 12 changes during the sampling interval Dt using each of the provisional chirp rate ⁇ 0 and the window function W (f (m)).
  • the amount of change in frequency Df (m) is calculated (step ST2 in FIG. 4).
  • Wave is the average value of the window function W (f (m)) in the band of ⁇ B / 2 ⁇ f (m) ⁇ B / 2.
  • the time response calculation unit 12 calculates the frequency f (m) at the sampling time m ⁇ Dt as the time response of the frequency in the nonlinear chap pulse from the frequency change amount Df (m) (step ST3 in FIG. 4).
  • the time response calculation unit 12 outputs each of the frequency f (m) and the sampling interval Dt at the sampling time m ⁇ Dt to the signal generation unit 13.
  • the calculation process of the frequency f (m) by the time response calculation unit 12 will be specifically described.
  • the time response calculation unit 12 calculates the frequency f (0). Since the signal generator 1 shown in FIG. 1 is premised on the fact that the center frequency of the frequency f (m) is an equivalent low frequency system of 0 [Hz], the frequency f (0) is expressed by the following equation (4). As shown in, it is 0.
  • the time response calculation unit 12 calculates all frequencies greater than 0 and B / 2 or less as frequencies f (m) in the positive frequency domain. That is, the time response calculation unit 12 repeatedly calculates the frequency f (m) at the sampling time m ⁇ Dt, as shown in the following equation (5).
  • the frequency f (m) at the sampling time m ⁇ Dt, as shown in the following equation (5).
  • f (m + 1) exceeds the B / 2
  • f (m + 1) does not exceed B / 2 do.
  • the time response calculation unit 12 calculates all frequencies smaller than 0 and greater than or equal to ⁇ B / 2 as the frequency f (m) in the negative frequency region. That is, the time response calculation unit 12 repeatedly calculates the frequency f (m) at the sampling time m ⁇ Dt, as shown in the following equation (7).
  • f (m-1) is less than ⁇ B / 2
  • f (m-1) is ⁇ B / 2. It shall not be less than.
  • the time response calculation unit 12 outputs each of the frequency f (m) and the sampling interval Dt at the sampling time m ⁇ Dt calculated repeatedly to the signal generation unit 13.
  • the frequency f (m) at the sampling time m ⁇ Dt repeatedly calculated by the time response calculation unit 12 is a frequency of a plurality of times different by the sampling interval Dt. Therefore, the frequency f (m) at the sampling time m ⁇ Dt repeatedly calculated by the time response calculation unit 12 is the window function W (f (m)) even though the sampling is performed at equal time intervals. It correlates with the amount of change Df (m) weighted by the reciprocal.
  • the time response calculation unit 12 calculates the frequency f (m) in the positive frequency domain by the equation (5), and the frequency f (m) in the negative frequency domain is calculated by the equation (7). ) Is calculated.
  • W (f (m)) W ( ⁇ f (m)
  • the frequency f (m) in the positive frequency domain Is calculated by the equation (5), and then the frequency f (m) in the negative frequency region may be given as shown in the following equation (9).
  • the f ( ⁇ m) on the right side of the equation (9) is obtained by replacing m at the frequency f (m) in the positive frequency domain with ⁇ m.
  • the signal generation unit 13 acquires the frequency f (m) and the sampling interval Dt at the sampling time m ⁇ Dt output from the time response calculation unit 12.
  • the signal generation unit 13 calculates the time response p (m) of the phase in the non-linear chap pulse by using the frequency f (m) at the sampling time m ⁇ Dt and the sampling interval Dt (step ST4 in FIG. 4).
  • the phase time response p (m) is a plurality of time phases that differ by the sampling interval Dt.
  • the process of calculating the phase time response p (m) by the signal generation unit 13 will be specifically described.
  • the signal generation unit 13 assumes that m changes by 1 in the range of M 0 + 1 ⁇ m ⁇ M 1, and as shown in the following equations (12) and (13), the amount of phase change.
  • D p (m) and the phase time response p (m) is calculated.
  • the signal generation unit 13 assumes that m changes by 1 in the range of M 0 ⁇ m ⁇ M 1, and as shown in the following equation (14), the phase of the radar signal s (m) is changed.
  • a non-linear chirped pulse having a time response p (m) is generated (step ST5 in FIG. 4).
  • the signal generation unit 13 outputs the generated nonlinear chirped pulse as a radar signal s (m) to the radar signal holding unit 22 of the storage unit 2.
  • FIG. 5 is an explanatory diagram showing the time-frequency characteristics of the radar signal s (m) generated by the signal generation unit 13.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • the thick line shows the time-frequency characteristics of the radar signal s (m) when the Hamming window is used as the window function W (f (m)).
  • the thin line shows the time-frequency characteristics of the linear chirp.
  • FIG. 6 is an explanatory diagram showing the power characteristics on the frequency of the radar signal s (m) generated by the signal generation unit 13.
  • the horizontal axis represents the frequency and the vertical axis represents the normalized amplitude after pulse compression. The normalized amplitude is equivalent to the normalized power before pulse compression.
  • the thick line shows the power characteristic on the frequency in the radar signal s (m) shown by the thick line in FIG.
  • the thin line is the Hamming window.
  • the radar signal s (m) when the Hamming window is used as the window function W (f (m)) obtains a signal component similar to that of the humming window on the frequency.
  • FIG. 7 is an explanatory diagram showing a radar signal s (m)'after pulse compression.
  • the horizontal axis represents the range and the vertical axis represents the normalized power.
  • the thick line indicates the radar signal s (m)'which is the signal after pulse compression of the radar signal s (m) shown by the thick line in FIG. 5, and the thin line is the signal after pulse compression of the linear chirp provided with the Hamming window. Is shown.
  • the radar signal s (m)'after pulse compression has substantially the same characteristics as the signal after pulse compression of a linear chirp provided with a Hamming window. That is, the radar signal s (m)'after pulse compression has a sidelobe reduction effect similar to the signal after pulse compression of the linear chirp provided with the Hamming window.
  • the shape of the power distribution on the frequency in the radar signal s (m) generated by the signal generation unit 13 has the same shape as the window function W (f (m)). Therefore, if the shape indicated by the window function W (f (m)) is, for example, a single peak type as shown in FIG. 8A or FIG. 8B, the shape of the power distribution on the frequency in the radar signal s (m) is , Becomes a single peak type. If the shape indicated by the window function W (f (m)) is, for example, a double peak type as shown in FIG. 9A or FIG. 9B, the shape of the power distribution on the frequency in the radar signal s (m) is double. It becomes a peak type.
  • FIGS. 9A and 9B is an explanatory diagram showing an example of a window function W (f (m)) having a single peak shape.
  • FIGS. 9A and 9B is an explanatory diagram showing an example of a window function W (f (m)) having a compound peak shape.
  • the time response calculation unit 12 and the time response calculation unit 12 that calculate the time response of the frequency in the non-linear charp pulse by using the power characteristic of the frequency in the non-linear chirp pulse having a bias in the power distribution of the frequency.
  • the signal generation unit 13 that calculates the time response of the phase in the non-linear charp pulse and generates the non-linear chap pulse having the time response of the phase.
  • the signal generation device 1 is configured to include the above. Therefore, the signal generation device 1 can prevent deterioration of the signal waveform of the nonlinear chirped pulse due to the inclusion of an error in the time response of the phase.
  • the time response calculation unit 14 calculates the rate of change of the frequency using the power characteristic of the frequency in the non-linear chirp pulse, and calculates the time response of the frequency in the non-linear chirp pulse from the rate of change of the frequency.
  • the generation device 1 will be illustrated.
  • FIG. 10 is a configuration diagram showing a radar system including the signal generation device 1 according to the second embodiment.
  • the same reference numerals as those in FIG. 1 indicate the same or corresponding parts, and thus the description thereof will be omitted.
  • FIG. 11 is a hardware configuration diagram showing the hardware of the signal generation device 1 according to the second embodiment. In FIG. 11, the same reference numerals as those in FIG. 2 indicate the same or corresponding parts, and thus the description thereof will be omitted.
  • the storage unit 2 includes a power characteristic holding unit 24, a radar signal holding unit 22, and a display data holding unit 23.
  • the power characteristic holding unit 24 holds a function R (f) indicating the power corresponding to each frequency in the nonlinear chirped pulse as the power characteristic of the frequency in the nonlinear chirped pulse.
  • the time response calculation unit 14 is realized by, for example, the time response calculation circuit 34 shown in FIG.
  • the time response calculation unit 14 acquires each of the pulse time width T and the sampling interval Dt in the nonlinear chirped pulse output from the initial value setting unit 11.
  • the time response calculation unit 14 acquires the function R (f) stored by the power characteristic holding unit 24.
  • the time response calculation unit 14 uses the power characteristic of the frequency indicated by the function R (f), and uses the frequency change rate ⁇ F n / ⁇ T n (n is a natural number satisfying 1 ⁇ n ⁇ N: N is 3 or more. Calculate the natural number).
  • the time response calculation unit 14 calculates the time response f (t) of the frequency in the nonlinear chirped pulse from the rate of change ⁇ F n / ⁇ T n of the frequency.
  • the time response calculation unit 14 outputs the time response f (t) of the frequency to the signal generation unit 13.
  • each of the initial value setting unit 11, the time response calculation unit 14, and the signal generation unit 13, which are the components of the signal generation device 1, is realized by dedicated hardware as shown in FIG. doing. That is, it is assumed that the signal generation device 1 is realized by the initial value setting circuit 31, the time response calculation circuit 34, and the signal generation circuit 33.
  • Each of the initial value setting circuit 31, the time response calculation circuit 34, and the signal generation circuit 33 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof. The thing is applicable.
  • the components of the signal generator 1 are not limited to those realized by dedicated hardware, but the signal generator 1 is realized by software, firmware, or a combination of software and firmware. It is also good.
  • FIG. 3 shows a program for causing a computer to execute each processing procedure in the initial value setting unit 11, the time response calculation unit 14, and the signal generation unit 13. It is stored in the memory 41. Then, the processor 42 shown in FIG. 3 executes the program stored in the memory 41.
  • FIG. 11 shows an example in which each of the components of the signal generation device 1 is realized by dedicated hardware
  • FIG. 3 shows an example in which the signal generation device 1 is realized by software, firmware, or the like. ..
  • this is only an example, and some components in the signal generation device 1 may be realized by dedicated hardware, and the remaining components may be realized by software, firmware, or the like.
  • the initial value setting unit 11 sets the sampling interval Dt of the nonlinear chirped pulse from the frequency bandwidth B of the nonlinear chirped pulse and the oversampling rate ⁇ .
  • the initial value setting unit 11 outputs each of the pulse time width T and the sampling interval Dt in the nonlinear chirped pulse to the time response calculation unit 14.
  • the time response calculation unit 14 acquires each of the pulse time width T and the sampling interval Dt in the nonlinear chirped pulse output from the initial value setting unit 11.
  • the time response calculation unit 14 acquires the function R (f) stored by the power characteristic holding unit 24.
  • FIG. 12 is an explanatory diagram showing an example of the function R (f).
  • the horizontal axis represents frequency and the vertical axis represents electric power.
  • the function R (f) shown in FIG. 12 shows each power in N frequency domains.
  • R (f 1 ) P 1 (F 0 ⁇ f 1 ⁇ F 1 )
  • R (f 2 ) P 2 (F 1 ⁇ f 2 ⁇ F 2 ) :
  • R (f N ) P N (F N-1 ⁇ f N ⁇ F N )
  • the time response calculation unit 14 calculates the amount of change ⁇ F n between the frequency F n and the frequency F n-1 .
  • n 1, 2, ..., N.
  • ⁇ F N F N ⁇ F N-1
  • the function R (f) represents the electric power corresponding to each frequency in a rectangular shape.
  • the time response calculation unit 14 calculates the frequency change rate ⁇ F n / ⁇ T n , assuming that the time required for the frequency transition is ⁇ T n (see FIG. 13) in the N frequency domains.
  • the following c is an arbitrary constant.
  • ⁇ F N / ⁇ T N c / P N
  • FIG. 13 is an explanatory diagram showing the time ⁇ T n required for the frequency transition and the frequency change amount ⁇ F n.
  • the horizontal axis represents time and the vertical axis represents frequency.
  • each of the time required for the transition frequency is ⁇ T 1 ⁇ ⁇ T N
  • the total time of ⁇ T 1 ⁇ ⁇ T N is the pulse time width T of the nonlinear chirp pulse.
  • the time response calculation unit 14 calculates the time response f (t) of the frequency in the nonlinear chirped pulse from the char plate ⁇ n having the frequency change rate ⁇ F n / ⁇ T n. ..
  • the time response calculation unit 14 outputs each of the frequency time response f (t) and the sampling interval Dt to the signal generation unit 13.
  • the signal generation unit 13 acquires each of the time response f (t) of the frequency output from the time response calculation unit 14 and the sampling interval Dt. As shown in the following equation (20), the signal generation unit 13 calculates the phase change amount D p (g) using each of the frequency time response f (t) and the sampling interval Dt.
  • the signal generation unit 13 adds the phase change amount D p (g) to the initial value p (0) of the phase time response shown in the following equation (21) to obtain the phase time response p (g). Is calculated.
  • the signal generation unit 13 generates a non-linear chirped pulse having a phase time response p (g) as the radar signal s (m).
  • the signal generation unit 13 outputs the generated nonlinear chirped pulse as a radar signal s (m) to the radar signal holding unit 22 of the storage unit 2.
  • the time response calculation unit 14 calculates the rate of change of the frequency using the power characteristic of the frequency in the non-linear chirp pulse, and calculates the time response of the frequency in the non-linear chirp pulse from the rate of change of the frequency.
  • the signal generation device 1 shown in FIG. 10 was configured. Therefore, the signal generation device 1 shown in FIG. 10 can prevent deterioration of the signal waveform of the nonlinear chirped pulse due to the inclusion of an error in the time response of the phase, similarly to the signal generation device 1 shown in FIG. ..
  • the present disclosure is suitable for a signal generator, a signal generation method, and a signal generation program that generate a non-linear chirped pulse.

Abstract

L'invention concerne un dispositif de génération de signal (1) comprenant : une unité de calcul de réponse temporelle (12) destinée à utiliser des caractéristiques de puissance d'une fréquence d'une impulsion de fluctuation de longueur d'onde non linéaire avec une distribution de puissance d'asymétrie de fréquence pour calculer une réponse temporelle de la fréquence de l'impulsion de fluctuation de longueur d'onde non linéaire ; et une unité de génération de signal (13) destinée à utiliser la réponse temporelle de la fréquence calculée par l'unité de calcul de réponse temporelle (12) et une période d'échantillonnage de l'impulsion de fluctuation de longueur d'onde non linéaire pour calculer une réponse temporelle d'une phase de l'impulsion de fluctuation de longueur d'onde non linéaire et pour générer une impulsion de fluctuation de longueur d'onde non linéaire ayant la réponse temporelle de la phase.
PCT/JP2020/017602 2020-04-24 2020-04-24 Dispositif de génération de signal, procédé de génération de signal et programme de génération de signal WO2021214960A1 (fr)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2004077775A1 (fr) * 2003-02-25 2004-09-10 Yokohama Tlo Company, Ltd. Procede pour produire des formes d'impulsion
US7880672B1 (en) * 2007-09-17 2011-02-01 Sandia Corporation Generating nonlinear FM chirp radar signals by multiple integrations
JP2011038948A (ja) * 2009-08-14 2011-02-24 Tokyo Keiki Inc パルス圧縮における送信波形生成方法、送信波形生成プログラム及び送信波形生成方法によって製造されたパルス圧縮装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004077775A1 (fr) * 2003-02-25 2004-09-10 Yokohama Tlo Company, Ltd. Procede pour produire des formes d'impulsion
US7880672B1 (en) * 2007-09-17 2011-02-01 Sandia Corporation Generating nonlinear FM chirp radar signals by multiple integrations
JP2011038948A (ja) * 2009-08-14 2011-02-24 Tokyo Keiki Inc パルス圧縮における送信波形生成方法、送信波形生成プログラム及び送信波形生成方法によって製造されたパルス圧縮装置

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