JP5509940B2 - Radio wave detector and radar number determination method used therefor - Google Patents

Description

  The present invention relates to a radio wave detection device and a radar determination method used therefor, and more particularly, to a radio wave detection device using a PRI (Pulse Repetition Interval) filter.

  The radio wave detection device related to the present invention is configured as shown in FIG. In FIG. 7, the radio wave detection apparatus related to the present invention includes an antenna 31, a receiver 32, a pulse data extraction circuit 33, a PRI filter circuit 34, a specification calculation circuit 35, a target data update circuit 36, It consists of a target data management table 37 and a target display circuit 38.

  The antenna 31 receives broadband radio waves. The receiver 32 performs signal conversion (frequency down-conversion, signal amplification) on the radio wave received by the antenna 31 so that the subsequent circuit operates optimally. The PRI filter circuit 34 separates the mixed pulse data for each PRI.

  The specification calculation circuit 35 creates “target data” having information on frequency, direction, received power, pulse width, and PRI. The “target data” may include other specifications in addition to these specifications, but here, only basic specifications will be omitted.

  The target data update circuit 36 refers to the target data management table 37, and if the specifications of the calculated "target data" are the same as the "target data" in the target data management table 37, the "target data" The “data” are integrated, and the “target data” originally registered in the target data management table 37 is rewritten to “integrated“ target data ”.

  The target display circuit 38 displays the target data recorded in the target data management table 37 for the operator in the azimuth direction. As for the PRI filter as described above, there is a technique described in Patent Document 1 below.

JP 2000-258521 A

  However, the radio wave detection apparatus related to the present invention does not extract the TOA (Time Of Arrival: time of arrival of the pulse) and the TOA of the latest time from the pulse data after the PRI filter, and the pulse data. However, there is a problem that the temporal information is lost and the temporal overlap of the continuous reception intervals of the target data cannot be analyzed.

  Further, in the radio wave detection device related to the present invention, there is no time overlap information, so that there is a problem that the operator has to manually determine whether the target data is a single radar or a plurality of radars.

That is, in the radio wave detection device related to the present invention, when target data is separated by the PRI filter, the targets such as radars that operate by switching the PRI are determined to be different targets for each PRI and are determined to be the same target. I can't.

  Accordingly, an object of the present invention is to solve the above problems and determine whether a target in the same direction is a radio wave emitted from a single radar or a radio wave emitted from a plurality of radars. It is an object of the present invention to provide a radio wave detection device capable of performing the same and a radar number determination method used therefor.

The radio wave detection apparatus according to the present invention separates radar waves using a PRI (Pulse Repetition Interval) filter, creates target data having frequency, azimuth, received power, pulse width, and PRI information, and a target data management table A radio wave detection device for recording,
An addition means for extracting the TOA of the earliest time and the latest TOA of the TOA (Time Of Arrival) after the PRI filter and adding it to the target data;
Target data to which the earliest time TOA and the latest time TOA are added by the adding means is recorded in the target data management table.

The radar number determination method according to the present invention separates radar waves using a PRI (Pulse Repetition Interval) filter, creates target data having frequency, azimuth, received power, pulse width, and PRI information and manages target data. A method for determining the number of radars used in a radio wave detector that records on a table,
The radio wave detection device performs an addition process of extracting the TOA at the earliest time and the TOA at the latest time from the TOA (Time Of Arrival) after the PRI filter and adding the extracted TOA to the target data. The target data to which the earliest TOA and the latest TOA are added in the process is recorded in the target data management table.

  The present invention is configured and operated as described above to determine whether the target in the same direction is a radio wave emitted from a single radar or a radio wave emitted from a plurality of radars. The effect that it can be obtained.

It is a block diagram which shows the structural example of the radio wave detection apparatus by the 1st Embodiment of this invention. It is a figure which shows the concept of the radar number determination method by the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the radio wave detector by the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the radio wave detector by the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the radio wave detector by the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the radio wave detection apparatus by the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the radio wave detection apparatus relevant to this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. First, an outline of a radio wave detection device according to the present invention will be described. The radio wave detector according to the present invention extracts a continuous reception section by extracting the earliest time TOA (Time Of Arrival: pulse reception time) and the latest time TOA, and stores this information in the target data management table. It is possible to provide a mechanism for automatically determining whether it is a single radar or a plurality of radars by recording and determining the overlap of continuous reception sections of target data with the same-direction TOA comparison circuit. It is characterized by that.

  In the radar wave separation method using a PRI (Pulse Repetition Interval) filter of a radio wave detection device, when a plurality of targets are detected from the same direction, the plurality of targets are changed by one radar. Therefore, whether the radio wave detection device side detects multiple targets, or since there are actually multiple radars, the radio wave detection device side detects whether multiple targets are detected automatically. It can be presented in

  FIG. 1 is a block diagram showing a configuration example of a radio wave detection device according to a first embodiment of the present invention, and FIG. 2 is a diagram showing a concept of a radar number determination method according to the first embodiment of the present invention. . FIG. 2A shows an example of a pulse train, and FIG. 2B shows the concept of the radar number determination method according to the first embodiment of the present invention.

  In FIG. 1, the radio wave detector according to the first embodiment of the present invention includes an antenna 11, a receiver 12, a pulse data extraction circuit 13, a PRI filter circuit 14, a specification calculation circuit 15, and TOA information. The circuit includes an additional circuit 16, a target data update circuit 17, a target data management table 18, a same-direction TOA comparison circuit 19, and a target display circuit 20.

  The antenna 11 receives a broadband radio wave. The receiver 12 performs signal conversion (frequency down-conversion, signal amplification) on the radio wave received by the antenna 11 so that the subsequent circuit operates optimally.

  The pulse data extraction circuit 13 extracts the specifications (frequency, azimuth, received power, pulse width, TOA) of the pulse signal from the pulse signal that is a high-frequency signal converted by the receiver 12.

  The PRI filter circuit 14 separates the mixed pulse data for each PRI. The specification calculation circuit 15 creates “target data” having information on frequency, direction, received power, pulse width, and PRI. In the processing described in the above background art, if the PRI is different, it is managed as a different target even if the other specifications are the same.

  The TOA information addition circuit 16 extracts the continuous reception section of the pulse train used to create the “target data” in the specification calculation circuit 15. The extraction of the continuous reception section is specifically, the TOA at the earliest time and the TOA at the latest time are extracted from the TOAs of the continuous pulse train, and added as additional information of “target data”.

  The target data update circuit 17 refers to the target data management table 18, and if the specifications of the calculated “target data” are the same as the “target data” in the target data management table 18, the “target data” is displayed. The “data” are integrated, and the “target data” originally registered in the target data management table 18 is rewritten to the integrated “target data”. The TOA with the earliest time and the TOA with the latest time are added without being overwritten.

  The target display circuit 20 displays the target data recorded in the target data management table 18 separately for the operator in the azimuth direction.

  The same azimuth TOA comparison circuit 19 determines that the target data having the same information other than the PRI on the target data management table 18 is emitted from different targets when the pulse train continuous reception sections overlap. . This is because a plurality of different PRI pulse trains with the same frequency are not emitted from the same radar at the same time.

  If there are no overlaps for N or more consecutive sections, it is determined that they are fired from the same target. Specifically, it is determined whether there is an overlap of continuous reception sections by comparing the TOA having the earliest time and the TOA having the latest time among the target data (see FIG. 2).

  The same azimuth TOA comparison circuit 19 adds a determination result as to whether the target data is emitted from the same radar or a plurality of radars as specifications of the target data. The target display circuit 20 also displays whether these targets are one target or a plurality of targets.

  As described above, in the present embodiment, the TOA with the earliest time and the TOA with the latest time among the TOAs are recorded / accumulated in the target data management table 18 for each target. These can be compared and analyzed. In the present embodiment, by comparing and analyzing these, it is possible to determine whether the target data in the same direction is emitted from one radar or a plurality of radars.

  In the present embodiment, the TOA history is compared between target data in the same direction to determine whether the radar is one radar or two radars (plural radars).

  3-5 is a figure for demonstrating operation | movement of the radio wave detection apparatus by the 1st Embodiment of this invention. The radar number determination method according to the embodiment of the present invention will be described with reference to FIGS.

  The antenna 11 receives a broadband radio wave. The receiver 12 performs signal conversion (frequency down-conversion, signal amplification) on the radio wave received by the antenna 11 so that the subsequent circuit operates optimally. The pulse data extraction circuit 13 extracts the specifications (frequency, azimuth, received power, pulse width, TOA) of the pulse signal from the pulse signal that is a high-frequency signal converted by the receiver 12.

  The PRI filter circuit 14 separates, for each PRI, a pulse signal in which a plurality of PRI signals are mixed. The specification calculation circuit 15 creates “target data” having information on frequency, direction, received power, pulse width, and PRI.

  In the processing described in the above background art, if the PRI is different, it is managed as a different target even if the other specifications are the same. The “target data” may include other specifications in addition to these specifications, but here, only basic specifications will be omitted.

  The TOA information addition circuit 16 extracts the continuous reception section of the pulse train used to create the “target data” in the specification calculation circuit 15. The extraction of the continuous reception section is specifically, the TOA at the earliest time and the TOA at the latest time are extracted from the TOAs of the continuous pulse train, and added as additional information of “target data”.

  The target data update circuit 17 refers to the target data management table 18, and if the specifications of the calculated “target data” are the same as the “target data” in the target data management table 18, the “target data” is displayed. The “data” are integrated, and the “target data” originally registered in the target data management table 18 is rewritten to the integrated “target data”. The TOA with the earliest time and the TOA with the latest time are added without being overwritten.

  The target display circuit 20 displays the target data recorded in the target data management table 18 separately for the operator in the azimuth direction.

  The same azimuth TOA comparison circuit 19 determines that the target data having the same information other than the PRI on the target data management table 18 is emitted from different targets when the pulse train continuous reception sections overlap. . This is because the same radar does not emit multiple types of pulse trains of different PRIs at the same time.

  The same azimuth TOA comparison circuit 19 determines that it has been fired from the same target when there is no overlap for N or more consecutive sections. Specifically, it is determined whether there is an overlap between consecutive reception sections by comparing the earliest time TOA and the latest time TOA among the target data.

  The same azimuth TOA comparison circuit 19 adds a determination result as to whether the target data is emitted from the same radar or a plurality of radars as specifications of the target data. The target display circuit 20 also displays whether these targets are one target or a plurality of targets.

  As described above, in the present embodiment, the TOA with the earliest time and the TOA with the latest time among the TOAs are recorded / accumulated in the target data management table 18 for each target. These can be compared and analyzed. In the present embodiment, by comparing and analyzing these, it is possible to determine whether the target data in the same direction is emitted from one radar or a plurality of radars.

  Next, operations of the specification calculation circuit 15, the TOA information addition circuit 16, the target data update circuit 17, and the target data management table 18 shown in FIG. 1 will be described with reference to FIG. The operation of the same-direction TOA comparison circuit 19 will be described with reference to FIG.

  FIG. 3 shows detailed operations of the specification calculation circuit 15, the TOA information addition circuit 16, the target data update circuit 17, and the target data management table 18 shown in FIG. In FIG. 3, the specifications (frequency, azimuth) are calculated by the specification calculation circuit 15 from the pulse data output from the PRI filter circuit 14.

  Normally, the specification calculation circuit 15 calculates only these specifications, but the TOA information addition circuit 16 also calculates the TOA at the earliest time and the TOA at the latest time, and adds these to the target data. Output to the target data update circuit 17.

  The target data update circuit 17 compares and integrates the same specifications in the target data management table 18 with the calculated target data. As a method of integrating each item, simple average, weighted average, simple overwriting, and the like can be considered, but since they are not directly related to the present invention, the details thereof will be omitted.

  The TOA with the earliest time and the TOA with the earliest time are not integrated because they are times, and are added as information. The newly created target data is output to the target data management table 18 and information in the target data management table 18 is overwritten.

  The same azimuth TOA comparison circuit 19 compares the earliest TOA and the earliest TOA of the same azimuth data in the target data management table 18 to determine the overlap of the pulse data.

  FIG. 4 shows an overlapping pattern of pulse data. When the overlapping pattern of pattern 1 shown in FIG. 4 occurs even once, it is determined that the target data are not pulse trains emitted from one radar but emitted from two different radars. be able to. This is because two pulses are not simultaneously emitted from one radar.

  The reason is that if a pulse train of different PRIs at the same frequency is fired simultaneously from one radar (= overlapping continuous pulses), the radar receives the reflected wave and performs the radar processing. Since the frequencies are the same, the signals are received with interference and cannot be processed correctly.

  From this, it is determined that a single radar does not emit overlapping pulse continuous sections, and conversely, if the pulse continuous sections overlap, it is determined that the pulse trains are not emitted from one radar. can do.

  The overlap pattern of pattern 2 shown in FIG. 4 is that the TOA with the latest time of one target data and the TOA with the earliest time of another target data are the same [(1) of pattern 2], or one target The difference between the TOA with the latest time of the data and the TOA with the earliest time of the other target data is the pattern [(2) of pattern 2] that matches the PRI of either of the target data being compared. In the case of a pattern, it may be determined that the two target data being compared are synchronized, and it is determined that the target is emitted from one radar that has switched the PRI.

  Depending on the reception situation due to the influence of the radio wave environment etc., not all pulses may be received. If all pulses are not received, it may occur that the conditions do not match in the TOA comparison, but if the number of matches is N or more, it is determined as one target data. It prevents misjudgment that it is the same target and gives flexibility to the reception situation. N is determined as a system parameter for each system.

  The overlap pattern of the pattern 3 shown in FIG. 4 shows that the difference between the TOA having the latest time of one target data and the TOA having the earliest time of the other target data is larger than which of the PRIs of the target data being compared. Is also a small or large pattern.

  If not synchronized, the pattern 1 is the same after the passage of time. For this reason, the determination is suspended, and after a certain amount of time has passed, if pattern 1 is obtained, it is determined that the pulses are not emitted from one radar but emitted from two different radars. If it does not become like pattern 1 even after the elapse of time, it is determined that it is synchronized like pattern 2 because it does not overlap.

  As described above, in the present embodiment, the overlapping pattern is determined, and it is determined whether the target data whose specifications other than the PRI match represent a single radar or two radars. be able to. In this embodiment, this information is added to the target data.

  The comparison is performed on two target data. When there are multiple target data in the same direction, comparison is made brute force. Thereby, as shown in FIG. 5, even when three or more PRIs are switched, it can be determined that the radar is a single radar. For example, as shown in FIG. 5, when there are three, it is determined that the pattern 3 is determined after the pattern 3 is determined, and it is determined that these three pulses are emitted from a single radar.

  The same azimuth TOA comparison circuit 19 operates every time the target data management table 18 is updated, and the determination content changes as time elapses. However, when the overlapping pattern of pattern 1 is detected even once, those target data are not emitted from one radar, and the determination content is not changed. In addition, the comparison between the same orientations is performed only on the updated target data, thereby reducing the calculation load.

  Although the operation of the embodiment has been described in detail above, the antenna 11, the receiver 12, the pulse data extraction circuit 13, the PRI filter circuit 14, and the target display circuit 20 shown in FIG. 1 are well known in the art. Since it is not directly related to the present invention, a detailed description of its operation is omitted.

  As described above, in this embodiment, the TOA at the earliest time is compared with the TOA at the earliest time, and the overlap of the continuous reception sections between the target data is determined. It is possible to determine whether the radio wave is emitted from a radar or the radio wave emitted from two radars (a plurality of radars).

  In this embodiment, the TOA at the earliest time is compared with the TOA at the earliest time, and the overlap of the continuous reception sections between the target data is automatically determined. While the target data is analyzed to determine the number of radars, the number of radars can be automatically determined.

  Furthermore, in this embodiment, even if there are a plurality of comparisons of target data in the same direction, the comparison is performed on all target data two by two, and the determination result is updated every time. Since it is possible to determine whether the azimuth target is a radio wave emitted from a single radar or from two radars, whether the actual target is a single radar or multiple Can be determined.

  Furthermore, in the present embodiment, the TOA at the earliest time is compared with the TOA at the earliest time, and the overlap of the continuous reception sections between the target data is determined. It is possible to determine with high accuracy whether it is a radio wave emitted from or from two radars.

  FIG. 6 is a block diagram showing a configuration example of a radio wave detection device according to the second exemplary embodiment of the present invention. In FIG. 6, the basic configuration of the second embodiment of the present invention is the same as that of the radio wave detection apparatus according to the first embodiment of the present invention shown in FIG. The processing up to the original calculation circuit 15 is further devised.

  That is, in FIG. 6, in the radio wave detector according to the second embodiment of the present invention, a distributor 21 is provided after the antenna 11, and receivers 12a to 12n, pulse data extraction circuits 13a to 13n, and PRI filter circuit 14a. To 14n, specification calculation circuits 15a to 15n, and TOA information addition circuits 16a to 16n have a plurality of configurations.

  As described above, in the present embodiment, the circuits from the receivers 12a to 12n to the specification calculation circuits 15a to 15n are configured to have a plurality of configurations, in addition to the effects of the first embodiment of the present invention described above. Thus, the effect of increasing the band that can be received instantaneously and increasing the processing speed can be obtained.

11 Antenna 12, 12a to 12n Receiver 13, 13a to 13n Pulse data extraction circuit 14, 14a to 14n PRI filter circuit 15, 15a to 15n Specification calculation circuit 16, 16a to 16n TOA information addition circuit
17 Target data update circuit
18 Target data management table
19 TOA comparison circuit with same direction
20 Target display circuit
21 Distributor

Claims (6)

A radio wave detector that separates radar waves using a PRI (Pulse Repetition Interval) filter, creates target data having frequency, azimuth, received power, pulse width, and PRI information and records them in a target data management table. And
An adding means for extracting the TOA of the earliest time and the TOA of the latest time of the TOA (Time Of Arrival) after the PRI filter, and adding to the target data;
Recording the target data to which the TOA of the earliest time and the TOA of the latest time are added by the adding means in the target data management table ;
1. A radio wave detection apparatus comprising: comparing means for comparing the TOA at the earliest time and the TOA at the latest time of target data in the same direction to determine the overlap of continuous reception sections between the target data . It said comparing means, radiolocation apparatus according to claim 1, wherein performing the temporal overlap judgment consecutive reception interval of the target data with each other every time the target data management table is updated. A distributor is provided after the antenna that receives the radar wave,
And PRI filter for separation of the dispensed radar waves each with the distributor, and creation means for creating the target data, according to claim 1 or claim, characterized in that the said additional means is a plurality respectively arranged 2. The radio wave detection device according to 2. Used for a radio wave detection device that separates radar waves using a PRI (Pulse Repetition Interval) filter, creates target data having frequency, azimuth, received power, pulse width, and PRI information and records them in a target data management table A radar number determination method,
The radio wave detection device performs an addition process of extracting the TOA at the earliest time and the TOA at the latest time from the TOA (Time Of Arrival) after the PRI filter and adding the extracted TOA to the target data. The target data to which the TOA of the earliest time and the TOA of the latest time are added in the process is recorded in the target data management table ,
The radio wave detection device performs comparison processing for comparing the TOA at the earliest time and the TOA at the latest time of target data in the same direction to determine an overlap between continuous reception sections of the target data. Radar number judgment method. 5. The radar according to claim 4 , wherein the radio wave detection device performs a temporal overlap determination of continuous reception intervals between the target data every time the target data management table is updated in the comparison process. Number judgment method. In the radio wave detector, a distributor is provided at the rear stage of the antenna that receives the radar wave,
A plurality of PRI filters that separate each radar wave distributed by the distributor, a creation unit that creates the target data, and a plurality of addition units that perform the addition process are provided in the radio wave detection device. The radar number determination method according to claim 4 or 5, wherein:

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