WO2014045927A1 - Radar à compression d'impulsion - Google Patents

Radar à compression d'impulsion Download PDF

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Publication number
WO2014045927A1
WO2014045927A1 PCT/JP2013/074308 JP2013074308W WO2014045927A1 WO 2014045927 A1 WO2014045927 A1 WO 2014045927A1 JP 2013074308 W JP2013074308 W JP 2013074308W WO 2014045927 A1 WO2014045927 A1 WO 2014045927A1
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WO
WIPO (PCT)
Prior art keywords
signal
transmission signal
transmission
unit
correction data
Prior art date
Application number
PCT/JP2013/074308
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English (en)
Japanese (ja)
Inventor
泰暢 淺田
昭典 清水
英公 後藤
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古野電気株式会社
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Filing date
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Publication of WO2014045927A1 publication Critical patent/WO2014045927A1/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
    • 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
    • G01S7/282—Transmitters
    • 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
    • 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 a pulse compression radar that performs predistortion processing.
  • a pulse compression radar that transmits a pulse having a predetermined width and performs a process of compressing the pulse width at the time of reception.
  • a signal amplified by an amplifying unit may be transmitted.
  • an amplifying unit power amplifier or the like
  • nonlinear distortion may occur.
  • a predistortion process is known.
  • correction data is obtained based on this distortion, and the transmission signal before amplification is corrected in advance so that the transmission signal has an ideal waveform after amplification by the amplification unit.
  • Patent Documents 1 to 3 disclose a transmission apparatus that performs this kind of predistortion processing.
  • Patent Document 1 discloses a configuration in which coefficients for calculating correction data are changed stepwise in order to quickly converge the correction data.
  • Patent Document 2 discloses a configuration in which an initial value of correction data is set in order to quickly converge the correction data.
  • Patent Document 3 discloses a configuration for calculating effective correction data based on acquired distortion.
  • the radar apparatus may switch and transmit a plurality of types of transmission signals as necessary. For example, a configuration using a transmission signal with a short pulse width for a short distance and a transmission signal with a long pulse width for a long distance, or a configuration for changing a transmission frequency to prevent interference between radar devices is known. Yes.
  • Patent Documents 1 to 3 are based on the premise that predistortion processing is performed in a configuration in which one type of transmission signal is transmitted. Therefore, the above-mentioned problems cannot be solved from these patent documents.
  • Patent Document 2 does not describe a circuit for predistortion or a circuit similar thereto. That is, Patent Document 2 does not provide a solution or suggestion for the above problem.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pulse compression radar capable of transmitting a plurality of types of transmission signals, in which distortion is appropriately removed even immediately after switching of transmission signals. It is to provide a configuration capable of transmitting a signal.
  • a pulse compression radar having the following configuration. That is, the pulse compression radar includes an ideal transmission signal output unit, a transmission signal amplification unit, an antenna, a signal feedback circuit, a correction data calculation unit, a correction data output unit, and a transmission signal correction unit.
  • the ideal transmission signal output unit outputs a transmission signal (transmission signal having an ideal waveform) before distortion occurs.
  • the transmission signal amplification unit amplifies and outputs an input transmission signal.
  • the antenna transmits a transmission signal output from the transmission signal amplification unit to the outside and receives a reflection signal of the transmission signal as a reception signal.
  • the signal feedback circuit feeds back the transmission signal output from the transmission signal amplifier as a feedback signal.
  • the correction data calculation unit obtains correction data for canceling distortion caused by amplification based on the feedback signal and the transmission signal output by the ideal transmission signal output unit.
  • the correction data output unit stores the correction data for a plurality of types of transmission signals, and outputs the correction data corresponding to the transmission signals transmitted by the antenna from the correction data.
  • the transmission signal correction unit corrects correction of the transmission signal output by the ideal transmission signal output unit based on the correction data selected by the correction data output unit.
  • the pulse compression radar can store a plurality of types of correction data, for example, when the transmission signal to be transmitted is switched, the correction data when the transmission signal was previously transmitted can be used. Therefore, since it is not necessary to obtain the correction data again, it is possible to transmit a transmission signal with less distortion immediately after switching the transmission signal.
  • the above-described pulse compression radar preferably has the following configuration. That is, the pulse compression radar includes a signal processing unit that obtains information on a target based on a reception signal received by the antenna. At least a part of the circuit that transmits the reception signal received by the antenna to the signal processing unit and the circuit that transmits the feedback signal to the correction data calculation unit are common to each other.
  • the two circuits can be shared, so that the circuit configuration can be simplified and the cost can be reduced by reducing the number of devices (mixers, etc.) that perform signal conversion and the like. Can be made.
  • the pulse compression radar includes a transmission signal output unit that stores a plurality of types of transmission signals corrected by the transmission signal correction unit and outputs a transmission signal selected from these transmission signals to the transmission signal amplification unit. Is preferred.
  • the corrected transmission signal can be transmitted without correcting the transmission signal using the correction data. Therefore, a transmission signal without distortion can be transmitted more quickly.
  • the ideal transmission signal output unit preferably stores a plurality of types of transmission signals before distortion occurs.
  • the antenna transmits a plurality of types of transmission signals while switching.
  • the pulse compression radar preferably includes a feedback signal storage unit that stores the feedback signal and continues to store the stored feedback signal until the correction data calculation unit obtains the correction data. .
  • the feedback signal storage unit continues to store the current feedback signal. Can continue to.
  • the correction data calculation unit compares the transmission signal output from the ideal transmission signal output unit with the feedback signal, and determines the correction data based on the comparison result. It is preferable to determine whether or not to recalculate.
  • the correction data is newly calculated and updated, and when the distortion of the transmission signal is small, control such as using the previously obtained correction data can be performed. . Therefore, the load on the correction data calculation unit can be reduced.
  • FIG. 1 is a block diagram of a radar apparatus according to an embodiment of the present invention.
  • the block diagram which shows the detailed structure of a correction coefficient output part and a transmission signal output part.
  • the graph which shows that the distortion of the transmission signal was eliminated by the predistortion process.
  • FIG. 1 is a block diagram of the radar apparatus 1.
  • the radar apparatus 1 of this embodiment is a type of pulse compression radar mounted on a ship, and transmits a transmission signal to the outside and analyzes the reflection signal (reception signal) to thereby detect the position and speed of a target. Can be detected.
  • the radar apparatus 1 alternately transmits a transmission signal having a short pulse width (short pulse signal) and a transmission signal having a long pulse width (long pulse signal).
  • a long pulse signal can clearly detect a distant target by compressing the pulse width at the time of reception.
  • the long pulse signal cannot detect a short-range target because the reflected signal reaches the radar device 1 while the signal is being transmitted. Therefore, the radar apparatus 1 transmits a short pulse signal in order to detect the target at a short distance.
  • the radar apparatus 1 is configured to perform the above-described predistortion processing for these two types of transmission signals.
  • a detailed configuration of the radar apparatus 1 will be described.
  • the radar apparatus 1 stores a transmission signal subjected to predistortion processing (detailed processing method will be described later) in the transmission signal output unit 13. And if the trigger pulse (transmission trigger) which determines the transmission timing of a transmission signal is produced
  • the DAC 14 converts the transmission signal output from the transmission signal output unit 13 from a digital signal to an analog signal, and outputs the converted transmission signal to the mixer 15.
  • the mixer 15 mixes this transmission signal with a local oscillator signal (local signal) output from the local oscillator 12. Thereby, the frequency of the transmission signal can be raised to the transmission frequency.
  • the mixer 15 outputs the transmission signal whose frequency is increased to the power amplifier 16.
  • the power amplifier 16 amplifies this transmission signal and transmits it from the antenna 10 to the outside via the circulator 11. Note that, when the transmission signal is amplified by the power amplifier 16, nonlinear distortion may occur in the transmission signal. However, in the present embodiment, since the transmission signal corrected in consideration of this distortion (predistortion processing is performed) is input to the power amplifier 16, radio waves without nonlinear distortion (less) are transmitted as the transmission signal. Sent.
  • the transmission signal output from the power amplifier 16 is also output to the switch 23 via the signal feedback circuit 42.
  • the transmission signal (feedback signal) output to the switch 23 is used for performing predistortion processing.
  • the antenna 10 is configured to transmit a transmission signal as described above, and to receive a reflected signal that has been reflected back from the target (echo source) as a reception signal.
  • the antenna 10 is configured to repeatedly transmit and receive radio waves while rotating in a horizontal plane at a predetermined rotation speed. With the above configuration, the horizontal plane can be scanned over 360 ° with the ship as the center, and the state of surrounding targets can be acquired.
  • the circulator 11 appropriately switches the signal path so that the high-energy transmission signal from the power amplifier 16 is not input to the reception-side circuit and the reception signal is appropriately input to the reception-side circuit. Can do.
  • the received signal passes through the circulator 11 and then passes through a limiter 21, an LNA (Low Noise Amplifier) 22, a switch 23, a mixer 24, and an ADC 25. Then, a radar image is generated by the radar image generation unit (signal processing unit) 26, and this radar image is displayed on the display unit 27.
  • the path through which the received signal passes may be referred to as a receiving circuit 41.
  • each device will be described.
  • the limiter 21 prevents a signal with an excessive signal level from flowing into the subsequent device. For example, the limiter 21 suppresses a signal having a signal level of a predetermined level or higher.
  • the LNA 22 performs processing for amplifying the signal level of the received signal. By passing through the LNA 22, the signal level of the weak received signal can be amplified to such an extent that subsequent processing can be performed.
  • the switch 23 receives the reception signal output from the LNA 22 and the feedback signal output from the power amplifier 16. The switch 23 outputs one of these signals to the mixer 24 at the subsequent stage.
  • the switching timing of the switch 23 depends on the transmission timing of the transmission signal of the radar apparatus 1 as shown in FIG. That is, the radar apparatus 1 switches between a transmission period for transmitting a transmission signal and a reception period for receiving a reflected signal at a predetermined timing, and does not perform transmission and reception in parallel.
  • the switch 23 outputs a feedback signal to the mixer 24 when the radar apparatus 1 is in the transmission period.
  • the switch 23 outputs a reception signal to the mixer 24 when the radar apparatus 1 is in the reception period.
  • the mixer 24 can reduce the frequency of the feedback signal or the reception signal by mixing the feedback signal or the reception signal and the local signal of the local oscillator 12.
  • the mixer 24 outputs a feedback signal or a reception signal whose frequency is lowered to the ADC 25.
  • the ADC 25 converts the feedback signal or the reception signal from an analog signal to a digital signal.
  • the ADC 25 outputs a feedback signal to the feedback signal storage unit 31 and outputs a reception signal to the radar image generation unit 26.
  • the radar image generation unit 26 performs pulse compression processing on the reception signal input from the ADC 25 in consideration of a transmission signal and the like, and creates a radar image based on the signal after the pulse compression processing. Specifically, the radar image generation unit 26 obtains the distance to the target based on the time difference between the timing at which the antenna 10 transmits the transmission signal and the timing at which the reflected signal is received. In addition, the radar image generation unit 26 acquires the direction of the target based on the rotation phase (direction) of the antenna 10. As described above, the radar image generation unit 26 generates a radar image.
  • the display unit 27 includes a liquid crystal display or the like, and can display a radar image created by the radar image generation unit 26.
  • the radar apparatus 1 includes a feedback signal storage unit 31, a signal adjustment unit 32, an ideal transmission signal output unit 33, a correction coefficient calculation unit (correction data calculation unit) 34, and a correction coefficient as a configuration for performing predistortion processing.
  • An output unit (correction data output unit) 35, a transmission signal correction unit 36, and a signal adjustment unit 37 are provided.
  • the feedback signal output from the switch 23 is input to the feedback signal storage unit 31 as described above.
  • the feedback signal is input to the feedback signal storage unit 31 every time the transmission signal is transmitted, the feedback signal is not updated while the correction coefficient calculation unit 34 and the like are performing the predistortion process.
  • the correction process using the feedback signal in use is continuously performed. be able to.
  • the signal adjustment unit 32 adjusts the feedback signal in order to appropriately perform the predistortion processing by the correction coefficient calculation unit 34 and the like.
  • the signal adjustment unit 32 performs, for example, processing for adjusting amplitude and phase in order to perform comparison.
  • the feedback signal after the signal adjustment by the signal adjustment unit 32 is output to the correction coefficient calculation unit 34.
  • the ideal transmission signal output unit 33 includes ideal transmission signal storage units 33a and 33b and an ideal transmission signal selection unit 33c.
  • the ideal transmission signal storage unit 33a stores a transmission signal (ideal waveform signal, ideal signal, reference signal) before distortion occurs for the short pulse signal.
  • the ideal transmission signal storage unit 33b stores an ideal signal of a long pulse signal.
  • the ideal transmission signal selection unit 33 c selects one of the two ideal signals and outputs the selected one to the correction coefficient calculation unit 34.
  • the ideal coefficient and the feedback signal after signal adjustment are input to the correction coefficient calculation unit 34.
  • the correction coefficient calculation unit 34 calculates a correction coefficient necessary for the predistortion process based on both signals.
  • the correction coefficient is a coefficient that quantitatively indicates the difference between the feedback signal and the ideal signal.
  • the correction coefficient calculation unit 34 calculates the correction coefficient h (n) by performing the calculation of the following equation (1).
  • x is an ideal signal
  • y is a feedback signal
  • ⁇ is a step size.
  • the step size is a coefficient that determines responsiveness (following performance).
  • the current correction coefficient h (n) is obtained based on the correction coefficient h (n ⁇ 1) obtained immediately before. That is, the correction coefficient calculation unit 34 updates the correction coefficient every moment in consideration of the past situation and the current situation.
  • step size how much the past situation is taken into consideration is determined by ⁇ (step size). If the step size is large, the current situation is emphasized, so that the difference between the ideal signal and the feedback signal can be corrected quickly, but the correction coefficient may diverge. On the other hand, if the step size is small, the correction coefficient is unlikely to diverge, but the difference between the ideal signal and the feedback signal cannot be corrected quickly.
  • the step size is determined in consideration of the above.
  • the correction coefficient output unit 35 stores correction coefficients for a plurality of types of signals. Specifically, as shown in FIG. 2A, the correction coefficient output unit 35 includes correction coefficient storage units 35a and 35b, and a correction coefficient selection unit 35c.
  • the correction coefficient storage unit 35a stores a correction coefficient for the short pulse signal. Therefore, when the feedback signal is a short pulse signal, the correction coefficient calculation unit 34 calculates a new correction coefficient using the correction coefficient stored in the correction coefficient storage unit 35a. Then, the correction coefficient calculation unit 34 stores (updates) the newly obtained correction coefficient in the correction coefficient storage unit 35a.
  • the correction coefficient storage unit 35b stores a correction coefficient for the long pulse signal. Therefore, as described above, the correction coefficient calculation unit 34 calculates a new correction coefficient using the correction coefficient stored in the correction coefficient storage unit 35b and the feedback signal (long pulse signal), and stores the correction coefficient in the correction coefficient storage unit 35b.
  • the correction coefficient selection unit 35 c reads the correction coefficient stored in one of the correction coefficient storage units 35 a and 35 b and outputs the correction coefficient to the transmission signal correction unit 36. For example, when the antenna 10 transmits a short pulse signal, the correction coefficient stored in the correction coefficient storage unit 35 a is read and output to the transmission signal correction unit 36.
  • the transmission signal correction unit 36 uses this correction coefficient to generate a transmission signal by adding a predetermined distortion to an ideal signal of a short pulse signal (a signal stored in the ideal transmission signal storage unit 33a) in advance.
  • the transmission signal generated by the transmission signal correction unit 36 is output to the signal adjustment unit 37.
  • the signal adjustment unit 37 adjusts the rate of the transmission signal and adjusts the amplitude in accordance with the DAC 14 at the subsequent stage.
  • the transmission signal adjusted by the signal adjustment unit 37 is output to the transmission signal output unit 13.
  • the transmission signal output unit 13 includes transmission signal storage units 13a and 13b and a transmission signal selection unit 13c.
  • the short pulse signal is stored in the transmission signal storage unit 13a.
  • the long pulse signal is stored in the transmission signal storage unit 13b.
  • the transmission signal selection unit 13c selects the short pulse signal or the long pulse signal according to the timing indicated by the transmission trigger as described above, and outputs it to the DAC 14. This transmission signal is amplified by the power amplifier 16 and then transmitted to the outside.
  • the transmission signal input to the power amplifier 16 is predistorted by the transmission signal correction unit 36 (distorted in advance). Therefore, when distortion is generated by the power amplifier 16, the distortions cancel each other, and the waveform of the transmission signal approximates an ideal signal.
  • Radar apparatus 1 performs predistortion processing as described above. Further, when a feedback signal is newly input, the correction coefficient calculation unit 34 and the like recalculates the correction coefficient based on the feedback signal. The transmission signal correction unit 36 corrects the transmission signal with the new correction coefficient. In this way, by repeating the predistortion process, distortion included in the transmission signal can be removed with higher accuracy.
  • the radar apparatus 1 of the present embodiment can simultaneously store both the correction coefficient for the short pulse signal and the correction coefficient for the long pulse signal. Therefore, since the correction coefficient can be continuously updated in parallel for both transmission signals, even if the transmission signal is switched every transmission, distortion of the transmission signal can be removed.
  • FIG. 4 schematically shows data indicating that the distortion of the transmission signal has been eliminated by the predistortion process.
  • FIG. 4A is a diagram comparing a signal obtained by pulse compression of a transmission signal that has not been subjected to predistortion processing, and a signal obtained by pulse compression of an ideal signal.
  • FIG. 4B is a diagram comparing a signal obtained by pulse-compressing a transmission signal that has been subjected to a predistortion process a sufficient number of times and a signal obtained by pulse-compressing an ideal signal.
  • the directivity is deteriorated due to the influence of distortion.
  • such deterioration is hardly found in the signal obtained by pulse-compressing the transmission signal in FIG. That is, the distortion of the transmission signal can be removed by the processing of this embodiment.
  • a mixer and a DAC for a radar image generation circuit are required in addition to a mixer and a DAC for a predistortion circuit.
  • a predistortion circuit and a radar image creation circuit are partially shared. Therefore, the mixer 15 and the DAC 14 can be shared by both circuits. Therefore, since the number of mixers and DACs can be reduced, the cost can be reduced.
  • the local oscillation signal of the local oscillator 12 needs to be transmitted to the three devices, so that the circuit configuration may be complicated.
  • control for reducing the load of calculation performed by the correction coefficient calculation unit 34 will be described. Since the calculation for calculating the correction coefficient is relatively heavy, the control can be performed as described below so that the correction coefficient is calculated only when necessary. This will be specifically described below.
  • the correction coefficient calculation unit 34 compares the ideal signal and the feedback signal before determining the correction coefficient, and determines whether or not both signals are approximate. If the correction coefficient calculation unit 34 determines that both signals are approximate, the correction coefficient is not calculated assuming that the distortion of the transmission signal has been sufficiently removed. In this case, the transmission signal correction unit 36 performs predistortion processing using the correction coefficient obtained previously.
  • the correction coefficient calculation unit 34 calculates the correction coefficient assuming that the distortion of the transmission signal is not sufficiently removed. In this case, the transmission signal correction unit 36 performs predistortion processing using the newly obtained correction coefficient.
  • the load on the correction coefficient calculation unit 34 can be reduced.
  • the signal comparison is not necessarily performed every time the feedback signal is input. For example, when both signals are approximated, the signals may be compared every predetermined number of times.
  • the radar apparatus 1 includes the ideal transmission signal output unit 33, the power amplifier 16, the antenna 10, the signal feedback circuit 42, the correction coefficient calculation unit 34, and the correction coefficient output unit. 35 and a transmission signal correction unit 36.
  • the ideal transmission signal output unit 33 outputs a transmission signal before distortion occurs.
  • the power amplifier 16 amplifies and outputs the input transmission signal.
  • the antenna 10 transmits the transmission signal output from the power amplifier 16 to the outside and receives a reflection signal of the transmission signal as a reception signal.
  • the signal feedback circuit 42 feeds back the transmission signal output from the power amplifier 16 as a feedback signal.
  • the correction coefficient calculation unit 34 Based on the feedback signal and the transmission signal output from the ideal transmission signal output unit 33, the correction coefficient calculation unit 34 obtains a correction coefficient for canceling distortion caused by amplification.
  • the correction coefficient output unit 35 stores correction coefficients for a plurality of types of transmission signals, and outputs correction coefficients corresponding to the transmission signals transmitted by the antenna from the correction coefficients.
  • the transmission signal correction unit 36 corrects the transmission signal input to the power amplifier 16 based on the correction coefficient selected by the correction coefficient output unit 35.
  • the radar apparatus 1 can store a plurality of types of correction coefficients, for example, when the transmission signal to be transmitted is switched, the correction coefficient when the transmission signal was previously transmitted can be used. Accordingly, since it is not necessary to obtain the correction coefficient again, it is possible to transmit a transmission signal with less distortion immediately after switching the transmission signal.
  • the transmission signals with different pulse widths shown in the above embodiment are mentioned. However, if different correction coefficients are required, they correspond to different transmission signals. For example, transmission signals having different transmission frequency changes (chirps) correspond to different types of transmission signals.
  • the radar apparatus is not limited to a configuration that transmits two types of transmission signals, and may be configured to transmit three or more types of transmission signals, for example. In this case, it is preferable that at least the number of correction coefficient storage units corresponding to the type of transmission signal is provided.
  • the signal amplifying unit is not limited to the power amplifier 16, and any device can be used as long as there is a possibility of distortion in the transmission signal.
  • the correction data calculation unit may be configured to calculate correction data necessary for performing the predistortion process, and calculates correction data by a method other than Equation (1). Also good. Further, the correction data calculation unit does not necessarily have to calculate the “coefficient”, and may be any configuration that calculates some data necessary for correction.
  • the storage target of the correction coefficient output unit 35 is not limited to the correction coefficient in the same manner.
  • the signal processing unit may be configured to obtain information on the target, and may be configured to obtain only the position of the target without generating the radar image.
  • the configuration shown in the block diagram of FIG. 1 is an example. If the configuration of the present invention is provided, addition, deletion, change of position, and the like of devices can be appropriately performed. For example, a configuration in which a high-pass filter is provided after the ADC 25 may be used. Further, a device that relays transmission / reception of correction coefficients may be provided between the correction coefficient calculation unit 34 and the correction coefficient storage units 35a and 35b. Similarly, a device that relays transmission of transmission signals may be provided between the signal adjustment unit 37 and the transmission signal storage units 13a and 13b.
  • the present invention is not limited to a marine radar device, but can be applied to a radar device mounted on another moving body such as an aircraft. Further, the present invention can be applied to a radar device for monitoring a route other than a use mounted on a moving body.

Abstract

[Problème] L'objet de la présente invention est de fournir un radar à compression d'impulsion capable de transmettre plusieurs types de signaux de transmission, à l'aide duquel il est possible de transmettre des signaux de transmission dans lequel les distorsions sont éliminées de manière appropriée, même lorsque les signaux de transmission viennent d'être commutés. [Solution] Un dispositif radar (radar à compression d'impulsion) calcule un coefficient de correction sur la base d'un signal de transmission avant que les distorsions ne se produisent et d'un signal de transmission (signal de retour) produit par un amplificateur de puissance. Ledit dispositif radar est doté d'une unité de sortie de coefficient de correction (35) qui stocke les coefficients de correction de multiples types de signaux de transmission et qui fournit un coefficient de correction correspondant au signal de transmission transmis par une antenne. Le coefficient de correction fourni par l'unité de sortie de coefficient de correction (35) est transmis à une unité de correction de signal de transmission (36). L'unité de correction de signal de transmission (36) corrige le signal de transmission fourni par une unité de sortie de signal de transmission idéal (33) en utilisant le coefficient de correction susmentionné, compte tenu des distorsions qui se produisent au cours de l'amplification par l'amplificateur de puissance.
PCT/JP2013/074308 2012-09-19 2013-09-10 Radar à compression d'impulsion WO2014045927A1 (fr)

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JP2012-206031 2012-09-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10001548B2 (en) 2015-01-23 2018-06-19 Navico Holding As Amplitude envelope correction

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62159073A (ja) * 1986-01-07 1987-07-15 Nec Corp レ−ダの送信装置
JPS6426178A (en) * 1987-07-22 1989-01-27 Toshiba Corp Transmitter-receiver
JP2006343131A (ja) * 2005-06-07 2006-12-21 Toshiba Corp レーダ装置
JP2008175552A (ja) * 2007-01-16 2008-07-31 Japan Radio Co Ltd 圧縮係数生成器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62159073A (ja) * 1986-01-07 1987-07-15 Nec Corp レ−ダの送信装置
JPS6426178A (en) * 1987-07-22 1989-01-27 Toshiba Corp Transmitter-receiver
JP2006343131A (ja) * 2005-06-07 2006-12-21 Toshiba Corp レーダ装置
JP2008175552A (ja) * 2007-01-16 2008-07-31 Japan Radio Co Ltd 圧縮係数生成器

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10001548B2 (en) 2015-01-23 2018-06-19 Navico Holding As Amplitude envelope correction
US10054670B2 (en) 2015-01-23 2018-08-21 Navico Holding As Adaptive frequency correction for pulse compression radar
US10215842B2 (en) 2015-01-23 2019-02-26 Navico Holding As Frequency correction for pulse compression radar

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