Abstract: A detection device detects a target based on a reception signal obtained from a reflection signal of a transmission signal. The detection device includes a Doppler frequency component generator that acquires a Doppler frequency component that indicates the amplitude level of a reception signal, for at least one Doppler frequency, based on the reception signal, a region identifier that identifies a first region and a second region that is outside the first region, based on the value of the amplitude level and the increase rate in the amplitude level, a second-Doppler frequency component suppressor that suppresses the Doppler frequency component of an unnecessary signal, out of the Doppler frequency component corresponding to the second region, and a combiner that combines the Doppler frequency component corresponding to the first region outputted from the region identifier, and the output of the second Doppler frequency component suppressor.

Abstract: Error that occurs when an absolute velocity of a target object is measured by using an antenna installed on a ship body that rocks and drifts in a complex manner since it floats on the sea is reduced. An antenna is installed on a ship body and transceives electromagnetic waves. A roll angle and a pitch angle of the ship body are detected by using an inclination sensor. An antenna velocity calculator calculates an antenna velocity of the antenna by using the detected roll and pitch angles of the ship body. An antenna velocity compensator compensates the antenna velocity of the antenna for a relative velocity between the ship body and a target object, the antenna velocity calculated by the antenna velocity calculator, the relative velocity obtained based on reflection waves received by the antenna.

Abstract: A signal processing device is provided. The device includes an echo signal input unit for receiving echo signals resulted from transmission signals reflected on an object. The transmission signals are transmitted from a transmission source at transmission timings at predetermined time intervals, at least one of the transmission timings shifted from the other timings in time. The device includes a complex reception signal generator for generating complex reception signals, a phase calculator for calculating a phase change amount of the complex reception signals with respect to a reference phase, a phase corrector for phase-correcting the complex reception signals and outputting the corrected signals, and a Doppler processor for performing Doppler processing on the corrected signals and outputting the Doppler-processed signals as Doppler echo signals of the object.

Abstract: A detection device detects a target based on a reception signal obtained from a reflection signal of a transmission signal. The detection device includes a Doppler frequency component generator that acquires a Doppler frequency component that indicates the amplitude level of a reception signal, for at least one Doppler frequency, based on the reception signal, a region identifier that identifies a first region and a second region that is outside the first region, based on the value of the amplitude level and the increase rate in the amplitude level, a second-Doppler frequency component suppressor that suppresses the Doppler frequency component of an unnecessary signal, out of the Doppler frequency component corresponding to the second region, and a combiner that combines the Doppler frequency component corresponding to the first region outputted from the region identifier, and the output of the second Doppler frequency component suppressor.

Abstract: Error that occurs when an absolute velocity of a target object is measured by using an antenna installed on a ship body that rocks and drifts in a complex manner since it floats on the sea is reduced. An antenna is installed on a ship body and transceives electromagnetic waves. A roll angle and a pitch angle of the ship body are detected by using an inclination sensor. An antenna velocity calculator calculates an antenna velocity of the antenna by using the detected roll and pitch angles of the ship body. An antenna velocity compensator compensates the antenna velocity of the antenna for a relative velocity between the ship body and a target object, the antenna velocity calculated by the antenna velocity calculator, the relative velocity obtained based on reflection waves received by the antenna.

Abstract: A signal selecting device is provided. The signal selecting device includes a transceiver for repeatedly transceiving electromagnetic waves, a target candidate detecting module for detecting a plurality of objects based on echo signals received by the transceiver, a phase change amount calculating module for calculating a phase change amount between two echo signals from two positions of which distances from the transceiver are substantially the same but azimuths from the transceiver are different, and an object selecting module for selecting a predetermined object among the plurality of objects detected by the target candidate detecting module in a first scan based on a phase change amount of the object, the predetermined object being the same object as an object selected by the object selecting module in a second scan that is performed before the first scan.

Abstract: A signal processing device is provided. The device includes an echo signal input unit for receiving echo signals resulted from transmission signals reflected on an object. The transmission signals are transmitted from a transmission source at transmission timings at predetermined time intervals, at least one of the transmission timings shifted from the other timings in time. The device includes a complex reception signal generator for generating complex reception signals, a phase calculator for calculating a phase change amount of the complex reception signals with respect to a reference phase, a phase corrector for phase-correcting the complex reception signals and outputting the corrected signals, and a Doppler processor for performing Doppler processing on the corrected signals and outputting the Doppler-processed signals as Doppler echo signals of the object.

Abstract: A radar apparatus having an integral ARPA function transmits at least two kinds of pulse signals, each of which has different pulselength, according to a specific transmission pattern and receives echoes of the transmitted pulse signal. The radar apparatus includes an echo data generator for generating display echo data for each range scale selected for on-screen presentation by using an echo signal obtained with each transmission pulselength, an ARPA processor for generating a single set of motion-related information on each tracked target to be superimposed on the display echo data by using echo signals obtained with the different pulselengths, a display output synthesizer for superimposing the motion-related information on each tracked target generated by the ARPA processor on the display echo data, and a display unit for displaying a superimposed picture produced by the display output synthesizer.

Abstract: A radar apparatus in which an interpolated sweep between adjacent real sweeps is formed irrespective of an interval between the real sweeps, and image data corresponding to one cycle of sweeping can be certainly updated. A sweep azimuth generator (12) generates and outputs an azimuth of sweep interpolated between a current and previous real sweep azimuth based on the current and previous real sweep azimuths, to a draw address generator (7). A sweep data generator (11) performs linear interpolation based on solitariness removed data of current real sweep data read from a sweep memory (4), and the previous solitariness removed real sweep data stored therein to generate and output interpolated sweep data to an image memory (8). The image memory (8) stores the solitariness removed real sweep data or the interpolated sweep data based on the real and interpolated sweep azimuths from the draw address generator (7), and outputs them to a display (9).

Abstract: A radar apparatus transmits a pulse signal including pulses having at least two different pulselengths in a specific transmit pulse pattern and receives a returning echo signal through a single antenna. A tuning voltage setting timing generator generates a timing of setting a tuning voltage according to a combination of transmission pulselengths and a tuning processor performs tuning operation in a manner suited to a current transmission pulselength based on the tuning voltage setting timing. The radar apparatus may include a tuning voltage alteration decider for deciding whether or not to alter the tuning voltage based on a combination of alternate pulselengths before altering the pulselength of the pulse signal generated by a transmitter and the tuning processor alters the tuning voltage based on the result of decision made by the tuning voltage alteration decider.

Abstract: A radar apparatus where the rate of writing detected image data into an image memory does not decrease, irrespective of an enlarged amount of the detected image data. When an azimuth direction enlargement section of a W data generator receives detected image data of a sweep, it outputs the data to an image memory, and delays the data, depending on a cycle of an azimuth direction shift timing signal. When detected image data of a next sweep is drawn into a pixel adjacent in a sweep moving direction to a pixel into which previous detected image data has been drawn and is located at the same distance in a sweep distance direction, the delayed data is compared with new data, and the greater data is drawn into the new pixel. When the delayed data is greater, this detected image data is enlarged in the azimuth direction.

Abstract: A radar apparatus is provided in which an interpolated sweep between adjacent real sweeps is formed irrespective of an interval between the real sweeps, and image data corresponding to one cycle of sweeping can be certainly updated. A sweep azimuth generator 12 generates and outputs an azimuth of an interpolated sweep interpolated between a current real sweep azimuth and the previous real sweep azimuth based on the current real sweep azimuth and the previous real sweep azimuth, to a draw address generator 7. A sweep data generator 11 performs a linear interpolation process based on solitariness removed data of current real sweep data read from a sweep memory 4, and the previous solitariness removed real sweep data stored therein to generate and output interpolated sweep data between these real sweeps to an image memory 8.

Abstract: There is configured a radar or similar device that outputs received data that is currently being received and scan correlated image data in parallel with each other. Scan correlated image data and display image data resulting from received data from a display video memory 13 are input into a transitional data generator 11, and the transitional data generator 11 generates transitional data that represents an intermediate value and gradually changes from the received data into the scan correlated image data, using these signals, and inputs the transitional data into a selector 12. The received data, a FIRST or a LAST signal, and the transitional data are input into the selector 12, and the selector 12 outputs the received data if FIRST=1, and outputs the transitional data if FIRST=0, to the display video memory 13. This image data is fed back to the transitional data generator 11, and therefore it gradually changes from the received data into the scan correlated image data.

Abstract: A radar apparatus having an integral ARPA function transmits at least two kinds of pulse signals, each of which has different pulselength, according to a specific transmission pattern and receives echoes of the transmitted pulse signal. The radar apparatus includes an echo data generator for generating display echo data for each range scale selected for on-screen presentation by using an echo signal obtained with each transmission pulselength, an ARPA processor for generating a single set of motion-related information on each tracked target to be superimposed on the display echo data by using echo signals obtained with the different pulselengths, a display output synthesizer for superimposing the motion-related information on each tracked target generated by the ARPA processor on the display echo data, and a display unit for displaying a superimposed picture produced by the display output synthesizer.

Abstract: A radar apparatus transmits a pulse signal including pulses having at least two different pulselengths in a specific transmit pulse pattern and receives a returning echo signal through a single antenna. A tuning voltage setting timing generator generates a timing of setting a tuning voltage according to a combination of transmission pulselengths and a tuning processor performs tuning operation in a manner suited to a current transmission pulselength based on the tuning voltage setting timing. The radar apparatus may include a tuning voltage alteration decider for deciding whether or not to alter the tuning voltage based on a combination of alternate pulselengths before altering the pulselength of the pulse signal generated by a transmitter and the tuning processor alters the tuning voltage based on the result of decision made by the tuning voltage alteration decider.

Abstract: A radar apparatus or like is provided in which a rate at which detected image data is written into an image memory is prevented from decreasing, irrespective of an enlarged amount of the detected image data. When an azimuth direction enlargement section 90a of a W data generator 9 receives detected image data of a certain sweep, the azimuth direction enlargement section 90a outputs the detected image data to an image memory 10, and delays the detected image data, depending on a cycle of an azimuth direction shift timing signal. Next, when detected image data of a next sweep is drawn into a pixel adjacent in an azimuth direction (sweep moving direction) to a pixel into which previous detected image data has been drawn and is located at the same distance in a sweep distance direction, the delayed detected image data is compared with new detected image data, and the greater data is drawn into the new pixel.

Abstract: A radar apparatus is provided which correctly combines and displays detected data obtained from a plurality of radar antennas. Detected data obtained from a radar antenna 11 is subjected to a correlation process in a correlator 91A. Detected data obtained from a radar antenna 21 is subjected to a correlation process in a correlator 91B. A mask image which designates the same address as that of the correlated data from the radar antenna 21 is set by a mask area generator 32 and is written into a mask image memory 62. For the correlated data from the correlators 91A and 91B, addresses corresponding to installed positions of the radar antennas 11 and 21 are set. For a process image memory 902B of the correlator 91B and the mask image memory 62, a common address is set. Correlated data input in accordance with mask data is stored in a display image memory 61 in accordance with an address set in a display screen and is also output to a display device 10.

Abstract: There is configured a radar or similar device that outputs received data that is currently being received and scan correlated image data in parallel with each other. Scan correlated image data and display image data resulting from received data from a display video memory 13 are input into a transitional data generator 11, and the transitional data generator 11 generates transitional data that represents an intermediate value and gradually changes from the received data into the scan correlated image data, using these signals, and inputs the transitional data into a selector 12. The received data, a FIRST or a LAST signal, and the transitional data are input into the selector 12, and the selector 12 outputs the received data if FIRST=1, and outputs the transitional data if FIRST=0, to the display video memory 13. This image data is fed back to the transitional data generator 11, and therefore it gradually changes from the received data into the scan correlated image data.