JP2021032774A - Radar device and method for determining interference - Google Patents

Radar device and method for determining interference Download PDF

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JP2021032774A
JP2021032774A JP2019154729A JP2019154729A JP2021032774A JP 2021032774 A JP2021032774 A JP 2021032774A JP 2019154729 A JP2019154729 A JP 2019154729A JP 2019154729 A JP2019154729 A JP 2019154729A JP 2021032774 A JP2021032774 A JP 2021032774A
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information
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朝海 青木
Tomomi Aoki
朝海 青木
宏一郎 五味
Koichiro Gomi
宏一郎 五味
恵一 山口
Keiichi Yamaguchi
恵一 山口
将一 和田
Masakazu Wada
将一 和田
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Toshiba Corp
Toshiba Infrastructure Systems and Solutions Corp
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Abstract

To accurately determine whether there was an interference at the time of reception.SOLUTION: A radar device receives a reception pulse signal, where a transmission pulse signal transmitted to a predetermined observation range is reflected. The radar device includes a processing unit for calculating polarization information on the relation between polarizations in the reception pulse signal and the difference of the polarization information in the reception pulse signal and determining whether there is an interference on the reception pulse signal on the basis of the difference of the polarization information.SELECTED DRAWING: Figure 1

Description

本発明の実施形態は、レーダ装置及び干渉判定方法に関する。 Embodiments of the present invention relate to radar devices and interference determination methods.

レーダ装置では、観測エリア内に山やビルなどの遮蔽物があると、その後方に不感地帯が発生することに加えて、データ精度が低下しやすいという問題がある。このため、観測範囲の狭い複数台のレーダ装置で漏れなく観測を行うことが望ましい。その一方で、複数台のレーダ装置を配置すると、他のレーダサイト等からの信号が干渉信号となり、データ精度が低下するという問題が生じる。 In the radar device, if there is a shield such as a mountain or a building in the observation area, there is a problem that a dead zone is generated behind the shield and the data accuracy is likely to decrease. Therefore, it is desirable to perform observations without omission with a plurality of radar devices having a narrow observation range. On the other hand, if a plurality of radar devices are arranged, signals from other radar sites or the like become interference signals, which causes a problem that data accuracy is lowered.

データ精度を向上させる一方策として、干渉信号と雨粒からの所望の反射信号との信号レベルの差異に着目して、閾値を適切に設定することで、干渉信号を除去することが考えられるが、干渉信号と所望の反射信号との信号レベル差に大きな差異がない場合には、干渉信号を除去することができず、データ精度が低下してしまう。 As a measure to improve the data accuracy, it is conceivable to remove the interference signal by paying attention to the difference in signal level between the interference signal and the desired reflected signal from the raindrop and setting the threshold value appropriately. If there is no large difference in the signal level difference between the interference signal and the desired reflected signal, the interference signal cannot be removed and the data accuracy is lowered.

特開２０１１−５９０２４号公報Japanese Unexamined Patent Publication No. 2011-59024

本実施形態は、受信時に干渉を受けたか否かを精度よく判定できるレーダ装置及び干渉判定方法を提供するものである。 The present embodiment provides a radar device and an interference determination method capable of accurately determining whether or not interference has been received at the time of reception.

本実施形態によれば、所定の観測範囲に向けて送信された送信パルス信号が反射された受信パルス信号を受信するレーダ装置であって、
前記受信パルス信号における偏波間の関係を示す偏波間情報、および前記受信パルス信号における前記偏波間情報の差分を算出し、
前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定する、処理部を備える、レーダ装置が提供される。 According to the present embodiment, it is a radar device that receives a received pulse signal that is a reflection of a transmitted pulse signal transmitted toward a predetermined observation range.
The difference between the interpolar information indicating the relationship between the polarizations in the received pulse signal and the interpolar information in the received pulse signal is calculated.
Provided is a radar device including a processing unit that determines whether or not the received pulse signal has been interfered with based on the difference in the information between polarizations.

第１の実施形態によるレーダ装置内の主要部分の構成を示すブロック図。The block diagram which shows the structure of the main part in the radar apparatus by 1st Embodiment. 偏波間情報として偏波間位相差を用いる例を示す図。The figure which shows the example which uses the phase difference between polarizations as the information between polarizations. 図１のレーダ装置の処理動作の一例を示すフローチャート。The flowchart which shows an example of the processing operation of the radar apparatus of FIG. 図１の干渉判定部の後段側に干渉除去部と雨量推定部を追加した一変形例によるレーダ装置のブロック図。A block diagram of a radar device according to a modified example in which an interference removing unit and a rainfall estimation unit are added to the rear side of the interference determination unit in FIG. 受信系統及び送信系統を備えたレーダ装置のブロック図。A block diagram of a radar device including a receiving system and a transmitting system. 第２の実施形態によるレーダ装置の概略構成を示すブロック図。The block diagram which shows the schematic structure of the radar apparatus by 2nd Embodiment. 図６のレーダ装置の処理動作の一例を示すフローチャート。The flowchart which shows an example of the processing operation of the radar apparatus of FIG. 第２の実施形態の一変形例によるレーダ装置の概略構成を示すブロック図。The block diagram which shows the schematic structure of the radar apparatus by one modification of 2nd Embodiment. 図８のレーダ装置の処理動作の一例を示すフローチャート。The flowchart which shows an example of the processing operation of the radar apparatus of FIG. 第３の実施形態によるレーダ装置の概略構成を示すブロック図。The block diagram which shows the schematic structure of the radar apparatus according to 3rd Embodiment. 図１０のレーダ装置の処理動作を模式的に示す図。The figure which shows typically the processing operation of the radar apparatus of FIG. 図１０のレーダ装置の処理動作の一例を示すフローチャート。The flowchart which shows an example of the processing operation of the radar apparatus of FIG. 図１０の構成に干渉判定に関する処理部を追加したブロック図。FIG. 5 is a block diagram in which a processing unit related to interference determination is added to the configuration of FIG. 第４の実施形態によるレーダ装置の概略構成を示すブロック図。The block diagram which shows the schematic structure of the radar apparatus by 4th Embodiment.

以下、図面を参照して、レーダ装置及び干渉判定方法の実施形態について説明する。以下では、レーダ装置及び干渉判定方法の主要な構成部分を中心に説明するが、レーダ装置には、図示又は説明されていない構成部分や機能が存在しうる。 Hereinafter, embodiments of the radar device and the interference determination method will be described with reference to the drawings. In the following, the main components of the radar device and the interference determination method will be mainly described, but the radar device may have components and functions not shown or described.

（第１の実施形態）
図１は第１の実施形態によるレーダ装置１内の主要部分の構成を示すブロック図である。図１のレーダ装置１は、必須の構成部分として、偏波間情報差算出部２と干渉判定部３とを備えている。 (First Embodiment)
FIG. 1 is a block diagram showing a configuration of a main part in the radar device 1 according to the first embodiment. The radar device 1 of FIG. 1 includes an information difference calculation unit 2 between polarizations and an interference determination unit 3 as essential components.

図１のレーダ装置１は、所定の観測範囲に向けて複数の時刻に送信された複数の送信パルス信号に応じて観測範囲から反射された複数の受信パルス信号を受信するものである。図１のレーダ装置１は、例えば気象を予測するために用いられ、観測範囲は、例えばレーダ装置１を中心とする環状の領域である。なお、レーダ装置１の用途は任意であり、観測範囲のサイズも任意である。 The radar device 1 of FIG. 1 receives a plurality of received pulse signals reflected from the observation range in response to a plurality of transmission pulse signals transmitted at a plurality of times toward a predetermined observation range. The radar device 1 of FIG. 1 is used, for example, for predicting the weather, and the observation range is, for example, an annular region centered on the radar device 1. The use of the radar device 1 is arbitrary, and the size of the observation range is also arbitrary.

偏波間情報差算出部２は、受信パルス信号における偏波間の関係を示す偏波間情報、および受信パルス信号における前記偏波間情報の差分を算出する。より具体的には、偏波間情報差算出部２は、複数の受信パルス信号の受信間隔（ＰＲＩ：Pulse Repetition Interval）での受信パルス信号の偏波間情報の差分を算出する。偏波間情報は、例えば偏波間情報算出部４で算出される情報である。偏波間情報算出部４は、アンテナ５の受信信号に基づいて、偏波間情報を算出する。 The interpolar information difference calculation unit 2 calculates the difference between the interpolar information indicating the relationship between the polarizations in the received pulse signal and the interpolar information in the received pulse signal. More specifically, the interpolar information difference calculation unit 2 calculates the difference in the interpolar information of the received pulse signals at the reception interval (PRI: Pulse Repetition Interval) of the plurality of received pulse signals. The interpolar information is, for example, information calculated by the interpolar information calculation unit 4. The interpolar information calculation unit 4 calculates the interpolar information based on the received signal of the antenna 5.

図１のレーダ装置１は、アンテナ５でのＩＱ検波部６を備えている。ＩＱ検波部６は、アンテナ５の受信信号に対してＩＱ（直交）検波処理を行う。より具体的には、ＩＱ検波部６は、アンテナ５の受信信号である水平偏波信号と垂直偏波信号の各偏波信号に対してＩＱ検波処理を行う。 The radar device 1 of FIG. 1 includes an IQ detection unit 6 at the antenna 5. The IQ detection unit 6 performs IQ (orthogonal) detection processing on the received signal of the antenna 5. More specifically, the IQ detection unit 6 performs IQ detection processing on each polarized signal of the horizontally polarized signal and the vertically polarized signal, which are the received signals of the antenna 5.

上述した偏波間情報算出部４は、ＩＱ検波部６でＩＱ検波された水平偏波信号と垂直偏波信号から偏波間情報を算出する。偏波間情報は、例えば以下の式（１）で表される偏波間位相差φdp、式（２）で表されるレーダ反射因子差Ｚdr、式（３）で表される偏波間相関係数ρhv、及び式（４）で表される偏波間位相差変化率Ｋdpの少なくとも一つを有する。
φdp＝φh−φv …（１）
Ｚdr＝Ｚh−Ｚv …（２）
ρhv＝Ｅ[Ｓh×Ｓv*］／[sqrt(zh×zv)] …（３）
Ｋdp＝［φdp(ｒ2)−φdp(ｒ1)]／[２×(ｒ2−ｒ1)] …（４） The interpolarization information calculation unit 4 described above calculates interpolarization information from the horizontally polarized signal and the vertically polarized signal IQ detected by the IQ detection unit 6. The interpolar information includes, for example, the interpolar phase difference φdp represented by the following equation (1), the radar reflection factor difference Zdr represented by the equation (2), and the interpolar correlation coefficient ρhv represented by the equation (3). , And at least one of the interpolar phase difference change rates Kdp represented by the equation (4).
φdp ＝ φh−φv… (1)
Zdr = Zh-Zv ... (2)
ρhv = E [Sh × Sv *] / [sqrt (zh × zv)]… (3)
Kdp = [φdp (r2) −φdp (r1)] / [2 × (r2-r1)]… (4)

式（１）の偏波間位相差φdpは、水平偏波信号の位相φhと垂直偏波信号φvの位相差である。式（２）のレーダ反射因子差Ｚdrは、水平偏波信号の強度のデシベル値Ｚhと垂直偏波信号の強度のデシベル値Ｚvの差である。式（３）の偏波間相関係数ρhvとは、水平偏波信号Ｓhと垂直偏波信号Ｓvとの相関である。式（３）のＥ[ ］は時間平均、「*」は複素共役、sqrt[ ］は平方根を表す。zhは水平偏波信号の平均電力、zvは垂直偏波信号の平均電力である。式（４）の偏波間位相差変化率Ｋdpは、伝送経路上の二点間（ｒ1，ｒ2）を往復する間に生じる偏波間位相差の単位距離当たりの差である。 The phase difference φdp between polarizations in the equation (1) is the phase difference between the phase φh of the horizontally polarized signal and the vertically polarized signal φv. The radar reflection factor difference Zdr of the equation (2) is the difference between the decibel value Zh of the intensity of the horizontally polarized signal and the decibel value Zv of the intensity of the vertically polarized signal. The interpolarization correlation coefficient ρhv in the equation (3) is the correlation between the horizontally polarized wave signal Sh and the vertically polarized wave signal Sv. In equation (3), E [] represents the time average, “*” represents the complex conjugate, and sqrt [] represents the square root. zh is the average power of the horizontally polarized signal and zv is the average power of the vertically polarized signal. The rate of change in phase difference between polarizations Kdp in the equation (4) is the difference per unit distance of the phase difference between polarizations that occurs while reciprocating between two points (r1, r2) on the transmission path.

偏波間情報は、微弱な干渉信号との識別性能に優れており、干渉信号が発生したとしても、偏波間情報は変化し難い。 The interpolar information has excellent discrimination performance from a weak interference signal, and even if an interference signal is generated, the interpolar information is unlikely to change.

偏波間情報差算出部２は、観測範囲内の着目位置の偏波間情報のヒット間の差分を算出する。ここで、ヒット間の差分とは、受信パルス信号の受信間隔における受信パルス信号の偏波間情報の差分である。 The interpolar information difference calculation unit 2 calculates the difference between the hits of the interpolar information at the position of interest within the observation range. Here, the difference between hits is the difference in the information between the polarizations of the received pulse signal at the reception interval of the received pulse signal.

干渉判定部３は、偏波間情報差算出部２で算出された偏波間情報の差分に基づいて、複数の受信パルス信号が干渉を受けたか否かを判定し、判定結果を示す信号処理データを出力する。すなわち、干渉判定部３は、第１時刻に受信された受信パルス信号および第１時刻の直前の受信となる第２時刻に受信された受信パルス信号における偏波間情報の差分が第１閾値よりも大きい第１条件を満たした場合には、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定し、第１条件を満たさない場合は干渉を受けていないと判定する。より具体的には、干渉判定部３は、着目している時刻（第１時刻）に受信された受信パルス信号の偏波間情報と、第１時刻の直前の第２時刻に受信された受信パルス信号の偏波間情報との差分（偏波間情報差１）が第１閾値より大きい第１条件と、第２時刻に受信された受信パルス信号の偏波間情報と、第２時刻の直前の第３時刻に受信された受信パルス信号の偏波間情報との差分（偏波間情報差２）が第２閾値未満である第２条件とを満たすか否かを判定する。すなわち、干渉判定部３は、第２時刻に受信された受信パルス信号および第２時刻の直前の受信となる第３時刻に受信された受信パルス信号における偏波間情報の差分が第２閾値未満である第２条件および第１条件を満たした場合には、受信パルス信号は干渉を受けたと判定し、第１条件及び第２条件の少なくとも一方を満たさない場合には、受信パルス信号は干渉を受けていないと判定する。上述した第１条件と第２条件は、以下の式（５）と式（６）の両方を満たすことを意味する。
偏波間情報差１＞第１閾値 …（５）
偏波間情報差２＜第２閾値 …（６） The interference determination unit 3 determines whether or not a plurality of received pulse signals have been interfered with each other based on the difference in the interpolarity information calculated by the interpolar information difference calculation unit 2, and generates signal processing data indicating the determination result. Output. That is, in the interference determination unit 3, the difference between the polarization-to-polarization information between the reception pulse signal received at the first time and the reception pulse signal received at the second time, which is the reception immediately before the first time, is larger than the first threshold value. When the large first condition is satisfied, it is determined whether or not the received pulse signal is interfered based on the difference in the interpolarization information, and when the first condition is not satisfied, it is determined that the received pulse signal is not interfered. More specifically, the interference determination unit 3 includes the interpolarization information of the received pulse signal received at the time of interest (first time) and the received pulse received at the second time immediately before the first time. The first condition in which the difference between the signal polarization information (interpolar information difference 1) is larger than the first threshold value, the polarization information of the received pulse signal received at the second time, and the third immediately before the second time. It is determined whether or not the difference (interpolarity information difference 2) of the received pulse signal received at the time from the polarization-to-polarization information satisfies the second condition that is less than the second threshold value. That is, in the interference determination unit 3, the difference between the polarization-to-polarization information between the reception pulse signal received at the second time and the reception pulse signal received at the third time, which is the reception immediately before the second time, is less than the second threshold value. When a certain second condition and the first condition are satisfied, it is determined that the received pulse signal has been interfered, and when at least one of the first condition and the second condition is not satisfied, the received pulse signal is interfered. Judge that it is not. The first condition and the second condition described above mean that both the following equations (5) and (6) are satisfied.
Information difference between polarizations 1> 1st threshold value ... (5)
Information difference between polarizations 2 <Second threshold value ... (6)

干渉判定部３は、式（５）の第１条件と式（６）の第２条件をともに満たす場合に、受信パルス信号は干渉を受けたと判定する。また、干渉判定部３は、第１条件と第２条件の少なくとも一方を満たさない場合には、受信パルス信号は干渉を受けていないと判定する。 The interference determination unit 3 determines that the received pulse signal has been interfered with when both the first condition of the equation (5) and the second condition of the equation (6) are satisfied. Further, the interference determination unit 3 determines that the received pulse signal is not interfered when at least one of the first condition and the second condition is not satisfied.

図１のレーダ装置１における、ＩＱ検波部６、偏波間情報算出部４、偏波間情報差算出部２、及び干渉判定部３の各処理は、後述する信号処理部（処理部とも呼ぶことがある）によって行うことができる。 Each process of the IQ detection unit 6, the interpolar information calculation unit 4, the interpolar information difference calculation unit 2, and the interference determination unit 3 in the radar device 1 of FIG. 1 may be referred to as a signal processing unit (also referred to as a processing unit) described later. Can be done by).

図２は偏波間情報として偏波間位相差を用いる例を示す図である。図２の横軸は干渉混信が起きる範囲内のヒット番号、縦軸は偏波間位相差[deg]である。ヒット番号とは、受信パルス信号の識別番号である。図２では、雨粒で反射された降水エコー信号（所望信号とも呼ぶ）の平均Ｓ／Ｎを２０ｄＢ、干渉信号の平均Ｓ／Ｎを２６ｄＢとした場合の受信パルス信号の偏波間位相差を図示している。図２では、降水エコー信号の偏波間位相差の基準値（真値）を０[deg]、干渉信号の偏波間位相差の基準値すなわち真値を１８０[deg]としている。 FIG. 2 is a diagram showing an example in which the phase difference between polarizations is used as the information between polarizations. The horizontal axis of FIG. 2 is the hit number within the range where interference interference occurs, and the vertical axis is the phase difference between polarizations [deg]. The hit number is an identification number of the received pulse signal. FIG. 2 illustrates the phase difference between polarizations of the received pulse signal when the average S / N of the precipitation echo signal (also called a desired signal) reflected by raindrops is 20 dB and the average S / N of the interference signal is 26 dB. ing. In FIG. 2, the reference value (true value) of the phase difference between the polarizations of the precipitation echo signal is 0 [deg], and the reference value, that is, the true value of the phase difference between the polarizations of the interference signal is 180 [deg].

図２によれば、干渉信号の受信時以外の偏波間位相差の平均値は−０．７９[deg]、所望信号の真値に対する変動は５０[deg]以下であることがわかる。また、干渉信号の受信時の偏波間位相差の平均値は１１９[deg]、所望信号の真値に対する変動値は９０[deg]以上である。よって、干渉の有無により、偏波間位相差の平均値に１２０[deg]もの差異が生じている。 According to FIG. 2, it can be seen that the average value of the phase difference between polarizations other than when the interference signal is received is −0.79 [deg], and the fluctuation of the desired signal with respect to the true value is 50 [deg] or less. Further, the average value of the phase difference between polarizations at the time of receiving the interference signal is 119 [deg], and the fluctuation value with respect to the true value of the desired signal is 90 [deg] or more. Therefore, there is a difference of 120 [deg] in the average value of the phase difference between polarizations depending on the presence or absence of interference.

図２の結果から、所望信号と干渉信号との電力差が６ｄＢと小さくても、干渉の有無で偏波間情報に有意な差が発生することがわかる。よって、偏波間情報の値を検出することで、干渉信号の有無を見逃すおそれを軽減できる。このように、受信パルス信号が微弱な干渉を受けた場合でも、受信パルス信号の偏波間情報を算出すると、偏波間情報は大きく変化する。したがって、偏波間情報の変化により、受信パルス信号が干渉を受けたか否かを精度よく判定できる。 From the results of FIG. 2, it can be seen that even if the power difference between the desired signal and the interference signal is as small as 6 dB, a significant difference occurs in the information between polarizations depending on the presence or absence of interference. Therefore, by detecting the value of the interpolarization information, it is possible to reduce the possibility of overlooking the presence or absence of the interference signal. In this way, even when the received pulse signal receives weak interference, the interpolar information changes greatly when the interpolar information of the received pulse signal is calculated. Therefore, it is possible to accurately determine whether or not the received pulse signal has been interfered with by the change in the information between the polarizations.

図３は図１のレーダ装置１の処理動作の一例を示すフローチャートである。このフローチャートは、所定の観測範囲からの受信パルス信号を受信している間、継続して実行される。 FIG. 3 is a flowchart showing an example of the processing operation of the radar device 1 of FIG. This flowchart is continuously executed while receiving a received pulse signal from a predetermined observation range.

まず、ＩＱ検波部６は、アンテナ５の受信信号をＩＱ検波して水平偏波信号と垂直偏波信号を出力し、偏波間情報算出部４は、ＩＱ検波された水平偏波信号と垂直偏波信号に基づいて、偏波間情報を算出する（ステップＳ１）。偏波間情報とは、上述したように、偏波間位相差、レーダ反射因子差、偏波間相関係数、及び偏波間位相差変化率の少なくとも一つを含む。 First, the IQ detection unit 6 IQ-detects the received signal of the antenna 5 and outputs a horizontally polarized signal and a vertically polarized signal, and the interpolarization information calculation unit 4 IQ-detected horizontally polarized signal and vertical bias. The interpolarization information is calculated based on the wave signal (step S1). As described above, the interpolar information includes at least one of the interpolar phase difference, the radar reflection factor difference, the interpolar correlation coefficient, and the interpolar phase difference change rate.

次に、偏波間情報差算出部２は、偏波間情報のヒット間の差分を算出する（ステップＳ２）。より詳細には、偏波間情報差算出部２は、受信パルス信号の受信間隔の間に変化する偏波間情報の差分を算出する。 Next, the interpolar information difference calculation unit 2 calculates the difference between the hits of the interpolar information (step S2). More specifically, the interpolar information difference calculation unit 2 calculates the difference in interpolar information that changes during the reception interval of the received pulse signal.

次に、干渉判定部３は、上述した式（５）と式（６）の両方の条件を満たすか否かを判定する（ステップＳ３）。干渉判定部３は、式（５）と式（６）の両方の条件を満たす場合には、干渉ありと判定し（ステップＳ４）、少なくともいずれか一つの条件を満たさない場合には、干渉なしと判定する（ステップＳ５）。 Next, the interference determination unit 3 determines whether or not both the above-mentioned equations (5) and (6) are satisfied (step S3). The interference determination unit 3 determines that there is interference when both the conditions of the equation (5) and the equation (6) are satisfied (step S4), and when at least one of the conditions is not satisfied, there is no interference. (Step S5).

図４は図１の干渉判定部３の後段側に干渉除去部７と雨量推定部８を追加した一変形例によるレーダ装置１のブロック図である。図４のレーダ装置１は、雨量を推定する用途に使用される気象レーダ装置の例を示している。 FIG. 4 is a block diagram of a radar device 1 according to a modified example in which an interference removing unit 7 and a rainfall estimation unit 8 are added to the rear side of the interference determining unit 3 of FIG. Radar device 1 in FIG. 4 shows an example of a weather radar device used for estimating rainfall.

干渉除去部７は、干渉判定部３にて干渉を受けていると判定された受信パルス信号を除去し、干渉を受けていないと判定された受信パルス信号をそのまま出力する。雨量推定部８は、干渉除去部７から出力された受信パルス信号に基づいて雨量を推定する。 The interference removing unit 7 removes the received pulse signal determined by the interference determining unit 3 to be interfered, and outputs the received pulse signal determined not to be interfered as it is. The rainfall estimation unit 8 estimates the rainfall based on the received pulse signal output from the interference removal unit 7.

図１及び図４のレーダ装置１は、受信系統のブロック構成しか図示していないが、送信系統のブロック構成を追加することができる。図５は受信系統及び送信系統を備えたレーダ装置１のブロック図である。図５のレーダ装置１は、アンテナ５と、送受切替部１１と、電力増幅部１２と、低雑音増幅部１３と、周波数変換部１４と、信号処理部１５と、送信制御部１６と、データ変換部１７と、データ表示部１８と、データ蓄積部１９とを備えている。 Although the radar device 1 of FIGS. 1 and 4 shows only the block configuration of the receiving system, the block configuration of the transmitting system can be added. FIG. 5 is a block diagram of a radar device 1 including a receiving system and a transmitting system. The radar device 1 of FIG. 5 includes an antenna 5, a transmission / reception switching unit 11, a power amplification unit 12, a low noise amplification unit 13, a frequency conversion unit 14, a signal processing unit 15, a transmission control unit 16, and data. A conversion unit 17, a data display unit 18, and a data storage unit 19 are provided.

送信制御部１６は、パルス幅、チャープ幅、テーパ率等の所要の制御を施した送信デジタル信号を生成する。信号処理部１５は、送信デジタル信号をアナログ送信信号に変換する。周波数変換部１４は、信号処理部１５が変換したアナログ送信信号の周波数をアップコンバートする。電力増幅部１２は、アップコンバートされたアナログ送信信号を増幅する。電力増幅部１２で増幅されたアナログ送信信号は、送受切替部１１を介して、アンテナ５から送信される。送受切替部１１は、電力増幅部１２で増幅された送信信号をアンテナ５に送るか、アンテナ５の受信信号を低雑音増幅部１３に送るかを切り替える。 The transmission control unit 16 generates a transmission digital signal with necessary controls such as a pulse width, a chirp width, and a taper ratio. The signal processing unit 15 converts the transmission digital signal into an analog transmission signal. The frequency conversion unit 14 up-converts the frequency of the analog transmission signal converted by the signal processing unit 15. The power amplification unit 12 amplifies the up-converted analog transmission signal. The analog transmission signal amplified by the power amplification unit 12 is transmitted from the antenna 5 via the transmission / reception switching unit 11. The transmission / reception switching unit 11 switches between sending the transmission signal amplified by the power amplification unit 12 to the antenna 5 and sending the reception signal of the antenna 5 to the low noise amplification unit 13.

アンテナ５は、所定の観測範囲内に複数の送信パルス信号を送ることを想定している。アンテナ５は回転可能であり、アンテナ５の回転方向に応じて、送信パルス信号の送信方向及び受信パルス信号の受信方向が変化する。アンテナ５が静止している状態では、同一の観測範囲に送信パルス信号が複数回送信される。アンテナ５が回転している状態では、アンテナ５の回転速度に応じて、送信パルス信号が送信される観測範囲が変化する。図５のレーダ装置１を気象レーダの用途に用いる場合、観測対象は、所定の観測範囲内に存在する降雨粒子である。アンテナ５から送信された送信パルス信号は、降雨粒子で反射されて、その受信パルス信号がレーダ装置１で受信される。 The antenna 5 is supposed to send a plurality of transmission pulse signals within a predetermined observation range. The antenna 5 is rotatable, and the transmission direction of the transmission pulse signal and the reception direction of the reception pulse signal change according to the rotation direction of the antenna 5. When the antenna 5 is stationary, the transmission pulse signal is transmitted a plurality of times in the same observation range. In the state where the antenna 5 is rotating, the observation range in which the transmission pulse signal is transmitted changes according to the rotation speed of the antenna 5. When the radar device 1 of FIG. 5 is used for a weather radar, the observation target is a rainfall particle existing within a predetermined observation range. The transmission pulse signal transmitted from the antenna 5 is reflected by the rainfall particles, and the reception pulse signal is received by the radar device 1.

図５のレーダ装置１内の受信系統における低雑音増幅部１３は、アンテナ５の微弱な受信信号レベルを増幅する。周波数変換部１４は、低雑音増幅部１３で増幅された受信信号の周波数を低くするダウンコンバートを行う。 The low noise amplification unit 13 in the reception system in the radar device 1 of FIG. 5 amplifies the weak reception signal level of the antenna 5. The frequency conversion unit 14 performs down-conversion to lower the frequency of the received signal amplified by the low noise amplification unit 13.

信号処理部１５は、ダウンコンバートされた受信信号に対する各種の信号処理を行う。より具体的には、信号処理部１５は、ダウンコンバートされた受信信号に対して、アナログデジタル変換、ＩＱ検波、偏波間情報算出、干渉検出、干渉除去、受信電力算出、ドップラ速度算出等の各種の信号処理を行う。上述した図１及び図４に図示した各ブロックの処理は、信号処理部１５で行われる。信号処理部１５は、信号処理プロセッサなどのハードウェアで構成されていてもよいし、信号処理部１５の少なくとも一部の処理をＣＰＵ（Central Processing Unit）がソフトウェア処理として実行してもよい。
より具体的には、信号処理部１５は、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定する。また、信号処理部１５は、第１時刻に受信された受信パルス信号および第１時刻の直前の受信となる第２時刻に受信された受信パルス信号における偏波間情報の差分が第１閾値よりも大きい第１条件を満たした場合には、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定し、第１条件を満たさない場合は干渉を受けていないと判定することができる。また、信号処理部１５は、第２時刻に受信された受信パルス信号および第２時刻の直前の受信となる第３時刻に受信された受信パルス信号における偏波間情報の差分が第２閾値未満である第２条件および第１条件を満たした場合には、受信パルス信号は干渉を受けたと判定し、第１条件及び第２条件の少なくとも一方を満たさない場合には、受信パルス信号は干渉を受けていないと判定することができる。 The signal processing unit 15 performs various signal processing on the down-converted received signal. More specifically, the signal processing unit 15 has various types such as analog-to-digital conversion, IQ detection, interpolarization information calculation, interference detection, interference removal, reception power calculation, and Doppler speed calculation for the down-converted received signal. Signal processing is performed. The processing of each block shown in FIGS. 1 and 4 described above is performed by the signal processing unit 15. The signal processing unit 15 may be configured by hardware such as a signal processing processor, or at least a part of the processing of the signal processing unit 15 may be executed by the CPU (Central Processing Unit) as software processing.
More specifically, the signal processing unit 15 determines whether or not the received pulse signal has been interfered with based on the difference in the information between the polarizations. Further, in the signal processing unit 15, the difference between the polarization-to-polarization information between the received pulse signal received at the first time and the received pulse signal received at the second time, which is the reception immediately before the first time, is larger than the first threshold value. When the large first condition is satisfied, it is determined whether or not the received pulse signal is interfered based on the difference in the interpolarization information, and when the first condition is not satisfied, it is determined that the received pulse signal is not interfered. Can be done. Further, in the signal processing unit 15, the difference between the polarization-to-polarization information between the received pulse signal received at the second time and the received pulse signal received at the third time, which is the reception immediately before the second time, is less than the second threshold value. When a certain second condition and the first condition are satisfied, it is determined that the received pulse signal has been interfered, and when at least one of the first condition and the second condition is not satisfied, the received pulse signal is interfered. It can be determined that it is not.

データ変換部１７は、信号処理部１５が処理したデータの変換処理を行い、その結果をデータ表示部１８及びデータ蓄積部１９に送る。データ表示部１８は、信号処理部１５が処理してデータ変換部１７が変換したデータを表示する。データ蓄積部１９は、信号処理部１５が処理してデータ変換部１７が変換したデータを記録媒体に蓄積する。データ蓄積部１９は、レーダ装置１の内部に限られず、レーダ装置１の外部に接続されるものでもよいし、インターネットなどを通じたクラウドなどでもよい。また、データ変換部１７は、変換処理したデータをデータ表示部１８やデータ蓄積部１９に送る他、レーダ装置１の内部または外部に電子機器に出力するようにしてもよい。この電子機器は、例えば変換処理したデータを表示する機器であってもよいし、分析、解析する機器であってもよい。なお、データ変換部１７がデータ表示部１８やデータ蓄積部１９に送ることも、出力に含まれる。 The data conversion unit 17 converts the data processed by the signal processing unit 15 and sends the result to the data display unit 18 and the data storage unit 19. The data display unit 18 displays the data processed by the signal processing unit 15 and converted by the data conversion unit 17. The data storage unit 19 stores the data processed by the signal processing unit 15 and converted by the data conversion unit 17 in the recording medium. The data storage unit 19 is not limited to the inside of the radar device 1, and may be connected to the outside of the radar device 1, or may be a cloud or the like via the Internet or the like. In addition to sending the converted data to the data display unit 18 and the data storage unit 19, the data conversion unit 17 may output the converted data to an electronic device inside or outside the radar device 1. This electronic device may be, for example, a device that displays the converted data, or a device that analyzes and analyzes the data. The output also includes the data conversion unit 17 sending to the data display unit 18 and the data storage unit 19.

このように、第１の実施形態では、微弱干渉の影響に敏感な偏波間情報に基づいて、複数の受信パルス信号が干渉を受けたか否かを判定するため、干渉を受けたか否かを高精度に判定できる。 As described above, in the first embodiment, in order to determine whether or not a plurality of received pulse signals have been interfered with based on the interpolar information sensitive to the influence of weak interference, it is highly determined whether or not the received pulse signals have been interfered. It can be judged with accuracy.

（第２の実施形態）
偏波間情報のみでは、雑音を干渉と誤検出するおそれがある。すなわち、一般に雑音の偏波間情報は、受信パルス信号を受信するたびにランダムに変動するため、雑音があると、受信パルス信号同士の偏波間情報の差分は増大しやすくなり、偏波間情報の差分のみでは雑音と干渉を区別するのが困難である。雑音を干渉と誤判定した場合、レーダ装置１内の干渉判定部３の後段側に雑音と干渉を識別して除去するブロックを設ける必要があり、レーダ装置１の構成が複雑になることに加えて、干渉を識別して除去するブロックを設けたとしても、精度よく干渉を除去できる保証はない。 (Second embodiment)
Noise may be erroneously detected as interference only with the interpolar information. That is, in general, the inter-polarity information of noise fluctuates randomly each time a received pulse signal is received. Therefore, if there is noise, the difference in inter-polarization information between received pulse signals tends to increase, and the difference in interpolar information It is difficult to distinguish between noise and interference by itself. When noise is erroneously determined as interference, it is necessary to provide a block for identifying and removing noise and interference on the rear side of the interference determination unit 3 in the radar device 1, which complicates the configuration of the radar device 1. Therefore, even if a block for identifying and removing the interference is provided, there is no guarantee that the interference can be removed accurately.

図６は第２の実施形態によるレーダ装置１の概略構成を示すブロック図である。図６のレーダ装置１は、図１の構成部分に加えて、信号レベル算出部２１と、信号対雑音レベル差算出部２２と、第１雑音判定部２３と、を備えている。 FIG. 6 is a block diagram showing a schematic configuration of the radar device 1 according to the second embodiment. The radar device 1 of FIG. 6 includes a signal level calculation unit 21, a signal-to-noise level difference calculation unit 22, and a first noise determination unit 23, in addition to the components of FIG.

信号レベル算出部２１は、複数の受信パルス信号の電力を表す信号レベルを算出する。より詳細には、信号レベル算出部２１は、ＩＱ検波部６でＩＱ検波処理を行った水平偏波信号及び垂直偏波信号の信号レベルをそれぞれ算出する。信号レベル算出部２１で算出された信号レベルは、信号対雑音レベル差算出部２２に入力される。 The signal level calculation unit 21 calculates a signal level representing the power of a plurality of received pulse signals. More specifically, the signal level calculation unit 21 calculates the signal levels of the horizontally polarized signal and the vertically polarized signal that have been subjected to IQ detection processing by the IQ detection unit 6. The signal level calculated by the signal level calculation unit 21 is input to the signal-to-noise level difference calculation unit 22.

信号対雑音レベル差算出部２２は、水平偏波信号及び垂直偏波信号の信号レベルと、雑音の電力を示す雑音レベルとのレベル差を算出する。より詳細には、信号対雑音レベル差算出部２２は、水平偏波信号の信号レベルＰhと雑音レベルＮhとのレベル差Ｐh／Ｎhを算出するとともに、垂直偏波信号の信号レベルＰvと雑音レベルＮvとのレベル差Ｐv／Ｎvを算出する。信号対雑音レベル差算出部２２で算出されたレベル差は、第１雑音判定部２３に入力される。 The signal-to-noise level difference calculation unit 22 calculates the level difference between the signal levels of the horizontally polarized signal and the vertically polarized signal and the noise level indicating the power of noise. More specifically, the signal-to-noise level difference calculation unit 22 calculates the level difference Ph / Nh between the signal level Ph and the noise level Nh of the horizontally polarized signal, and the signal level Pv and the noise level of the vertically polarized signal. Calculate the level difference Pv / Nv from Nv. The level difference calculated by the signal-to-noise level difference calculation unit 22 is input to the first noise determination unit 23.

第１雑音判定部２３は、信号対雑音レベル差算出部２２で算出されたレベル差に基づいて雑音の影響を判定する。より具体的には、第１雑音判定部２３は、レベル差が所定の閾値以下か否かを判定する。信号対雑音レベル差算出部２２が水平偏波信号と垂直偏波信号に分けてレベル差を算出した場合、第１雑音判定部２３は、両方のレベル差がそれぞれ対応する閾値以下か否かを判定する。 The first noise determination unit 23 determines the influence of noise based on the level difference calculated by the signal-to-noise level difference calculation unit 22. More specifically, the first noise determination unit 23 determines whether or not the level difference is equal to or less than a predetermined threshold value. When the signal-to-noise level difference calculation unit 22 calculates the level difference separately for the horizontally polarized signal and the vertically polarized signal, the first noise determination unit 23 determines whether or not both level differences are equal to or less than the corresponding threshold values. judge.

干渉判定部３は、第１雑音判定部２３の判定結果に基づいて、複数の受信パルス信号が干渉を受けていないか否かを判定する。より具体的には、干渉判定部３は、第１雑音判定部２３にてレベル差が第３閾値未満と判定されると、干渉なしと判定し、第１雑音判定部２３にてレベル差が第３閾値以上と判定されると、偏波間情報の差分に基づいて複数の受信パルス信号が干渉を受けたか否かを判定する。 The interference determination unit 3 determines whether or not a plurality of received pulse signals are interfered with each other based on the determination result of the first noise determination unit 23. More specifically, when the first noise determination unit 23 determines that the level difference is less than the third threshold value, the interference determination unit 3 determines that there is no interference, and the first noise determination unit 23 determines that the level difference is less than the third threshold value. If it is determined that the threshold value is equal to or greater than the third threshold value, it is determined whether or not a plurality of received pulse signals have been interfered with each other based on the difference in the information between polarizations.

図７は図６のレーダ装置１の処理動作の一例を示すフローチャートである。まず、信号レベル算出部２１は、ＩＱ検波部６でＩＱ検波された水平偏波信号及び垂直偏波信号の信号レベルを算出する（ステップＳ１１）。信号レベル算出部２１が算出する信号レベルは、電力レベルでもよいし、振幅レベルでもよい。信号レベルは、信号強度を類推できる値であれば、その他の物理量でもよい。 FIG. 7 is a flowchart showing an example of the processing operation of the radar device 1 of FIG. First, the signal level calculation unit 21 calculates the signal levels of the horizontally polarized signal and the vertically polarized signal IQ detected by the IQ detection unit 6 (step S11). The signal level calculated by the signal level calculation unit 21 may be a power level or an amplitude level. The signal level may be another physical quantity as long as the signal strength can be inferred.

次に、信号対雑音レベル差算出部２２は、複数の受信パルス信号の各受信間隔での信号レベルと雑音レベルとのレベル差（信号対雑音レベル差）を算出する（ステップＳ１２）。雑音レベルは、事前に測定した各偏波信号の平均的な雑音レベルを用いてもよいし、無音区間データから運用中に計算した値でもよい。より詳細には、このステップＳ１２では、上述したように、各受信パルス信号の水平偏波信号の信号レベルＰhと雑音レベルＮhとのレベル差Ｐh／Ｎhと、垂直偏波信号の信号レベルＰvと雑音レベルＮvとのレベル差Ｐv／Ｎvとを算出する。 Next, the signal-to-noise level difference calculation unit 22 calculates the level difference (signal-to-noise level difference) between the signal level and the noise level at each reception interval of the plurality of received pulse signals (step S12). The noise level may be the average noise level of each polarized signal measured in advance, or may be a value calculated during operation from the silent section data. More specifically, in this step S12, as described above, the level difference Ph / Nh between the signal level Ph and the noise level Nh of the horizontally polarized signal of each received pulse signal and the signal level Pv of the vertically polarized signal The level difference Pv / Nv from the noise level Nv is calculated.

次に、第１雑音判定部２３は、ステップＳ１２で算出された信号対雑音レベル差が第３閾値未満か否かを判定する（ステップＳ１３）。より詳細には、第１雑音判定部２３は、レベル差Ｐh／Ｎhが水平偏波信号用の第３閾値未満で、かつレベル差Ｐv／Ｎvが水平偏波信号用の第３閾値未満か否かを判定する。 Next, the first noise determination unit 23 determines whether or not the signal-to-noise level difference calculated in step S12 is less than the third threshold value (step S13). More specifically, the first noise determination unit 23 determines whether the level difference Ph / Nh is less than the third threshold value for the horizontally polarized signal and the level difference Pv / Nv is less than the third threshold value for the horizontally polarized signal. Is determined.

干渉判定部３は、ステップＳ１３の判定結果がＹＥＳであれば、雑音の可能性が高いことから、干渉なしと判定する（ステップＳ１４）。より詳細には、干渉判定部３は、レベル差Ｐh／Ｎhが第３閾値未満で、かつレベル差Ｐv／Ｎvが第３閾値未満の場合に、干渉なしと判定する。 If the determination result in step S13 is YES, the interference determination unit 3 determines that there is no interference because there is a high possibility of noise (step S14). More specifically, the interference determination unit 3 determines that there is no interference when the level difference Ph / Nh is less than the third threshold value and the level difference Pv / Nv is less than the third threshold value.

ステップＳ１３の判定結果がＮＯの場合は、図３のステップＳ２〜Ｓ６と同様の処理が行われる（ステップＳ１５〜Ｓ１８、Ｓ１４）。すなわち、各受信パルス信号の各偏波信号の信号レベルと雑音レベルとのレベル差が第３閾値以上であれば、受信パルス信号の水平偏波信号と垂直偏波信号の偏波間情報の大小によって、干渉があるか否かを判定する。 If the determination result in step S13 is NO, the same processing as in steps S2 to S6 of FIG. 3 is performed (steps S15 to S18, S14). That is, if the level difference between the signal level and the noise level of each polarized signal of each received pulse signal is equal to or higher than the third threshold value, it depends on the magnitude of the information between the polarized waves of the horizontally polarized signal and the vertically polarized signal of the received pulse signal. , Determine if there is interference.

このように、図７の処理では、各受信パルス信号の各偏波信号の信号レベルと雑音レベルとのレベル差が第３閾値未満であれば、干渉なしと判定するため、雑音信号を誤って干渉信号と判断するおそれを低減できる。 As described above, in the process of FIG. 7, if the level difference between the signal level and the noise level of each polarization signal of each received pulse signal is less than the third threshold value, it is determined that there is no interference, so that the noise signal is erroneously used. The risk of determining it as an interference signal can be reduced.

図６及び図７では、雑音レベルを何らかの手段で検出した後に、信号レベルと雑音レベルとのレベル差を算出する例を示したが、雑音レベル自体を検出せずに、信号レベルの一時的な変動により雑音レベルを推定することも考えられる。 In FIGS. 6 and 7, an example of calculating the level difference between the signal level and the noise level after detecting the noise level by some means is shown, but the noise level itself is not detected and the signal level is temporary. It is also possible to estimate the noise level from fluctuations.

図８は第２の実施形態の一変形例によるレーダ装置１の概略構成を示すブロック図である。図８のレーダ装置１は、図６の信号対雑音レベル差算出部２２の代わりに信号レベル差算出部２４を備え、第１雑音判定部２３の代わりに第２雑音判定部２５を備えている。 FIG. 8 is a block diagram showing a schematic configuration of the radar device 1 according to a modification of the second embodiment. The radar device 1 of FIG. 8 includes a signal level difference calculation unit 24 instead of the signal-to-noise level difference calculation unit 22 of FIG. 6, and a second noise determination unit 25 instead of the first noise determination unit 23. ..

信号レベル差算出部２４は、異なる時刻での信号レベルのレベル差を算出する。より詳細には、信号レベル差算出部２４は、着目している第１時刻に受信された受信パルス信号の偏波信号の信号レベルと、第１時刻の直前の第２時刻に受信された受信パルス信号の偏波信号の信号レベルとの差分１と、第２時刻に受信された受信パルス信号の偏波信号の信号レベルと、第２時刻の直前の第３時刻に受信された受信パルス信号の偏波信号の信号レベルとの差分２とを算出する。偏波信号が水平偏波信号と垂直偏波信号とを含んでいる場合には、水平偏波信号と垂直偏波信号のそれぞれについて、差分１と差分２を算出する。 The signal level difference calculation unit 24 calculates the level difference of the signal level at different times. More specifically, the signal level difference calculation unit 24 determines the signal level of the polarization signal of the received pulse signal received at the first time of interest and the reception received at the second time immediately before the first time. Difference 1 from the signal level of the polarization signal of the pulse signal, the signal level of the polarization signal of the reception pulse signal received at the second time, and the reception pulse signal received at the third time immediately before the second time. The difference 2 from the signal level of the polarization signal of is calculated. When the polarized signal includes a horizontally polarized signal and a vertically polarized signal, the difference 1 and the difference 2 are calculated for each of the horizontally polarized signal and the vertically polarized signal.

第２雑音判定部２５は、信号レベル差算出部２４で算出されたレベル差に基づいて、雑音の影響を判定する。より詳細には、第２雑音判定部２５は、着目している第１時刻に受信された受信パルス信号の信号レベルと、第１時刻の直前の第２時刻に受信された受信パルス信号の信号レベルとの差分（信号レベル差１）が第４閾値より大きい第３条件と、第２時刻に受信された受信パルス信号の信号レベルと、第２時刻の直前の第３時刻に受信された受信パルス信号の信号レベルとの差分（信号レベル差２）が第５閾値未満である第４条件とを満たすか否かを判定する。これらの第３条件と第４条件は、以下の式（７）と式（８）で表される。
信号レベル差１＞第４閾値 …（７）
信号レベル差２＜第５閾値 …（８） The second noise determination unit 25 determines the influence of noise based on the level difference calculated by the signal level difference calculation unit 24. More specifically, the second noise determination unit 25 determines the signal level of the received pulse signal received at the first time of interest and the signal of the received pulse signal received at the second time immediately before the first time. The third condition in which the difference from the level (signal level difference 1) is larger than the fourth threshold, the signal level of the received pulse signal received at the second time, and the reception received at the third time immediately before the second time. It is determined whether or not the difference (signal level difference 2) from the signal level of the pulse signal satisfies the fourth condition that is less than the fifth threshold value. These third and fourth conditions are represented by the following equations (7) and (8).
Signal level difference 1> 4th threshold ... (7)
Signal level difference 2 <fifth threshold value ... (8)

第２雑音判定部２５は、式（７）の第３条件と式（８）の第４条件とをともに満たす場合に、干渉の可能性があると判断する。第２雑音判定部２５は、第３条件と第４条件の少なくとも一方を満たさない場合には、受信パルス信号は干渉を受けていないと判定する。 The second noise determination unit 25 determines that there is a possibility of interference when both the third condition of the equation (7) and the fourth condition of the equation (8) are satisfied. The second noise determination unit 25 determines that the received pulse signal is not interfered with when at least one of the third condition and the fourth condition is not satisfied.

第４閾値と第５閾値は、干渉と雑音とを区別するために必要最小限の値に設定しておくことで、雑音や降水エコーを誤って干渉信号として誤検出する可能性を減らせる。 By setting the fourth threshold value and the fifth threshold value to the minimum necessary values for distinguishing between interference and noise, the possibility of erroneously detecting noise or precipitation echo as an interference signal can be reduced.

図９は図８のレーダ装置１の処理動作の一例を示すフローチャートである。まず、信号レベル算出部２１は、ＩＱ検波部６でＩＱ検波された水平偏波信号と垂直偏波信号の信号レベルを算出する（ステップＳ２１）。次に、信号レベル差算出部２４は、着目している時刻（第１時刻）での受信信号パルスの信号レベルと、その直前の第２時刻での受信パルス信号の信号レベルとの差分（信号レベル差１）を算出する。同様に、信号レベル差算出部２４は、第２時刻での受信信号パルスの信号レベルと、その直前の第３時刻での受信パルス信号の信号レベルとの差分（信号レベル差２）を算出する（ステップＳ２２）。 FIG. 9 is a flowchart showing an example of the processing operation of the radar device 1 of FIG. First, the signal level calculation unit 21 calculates the signal levels of the horizontally polarized signal and the vertically polarized signal IQ detected by the IQ detection unit 6 (step S21). Next, the signal level difference calculation unit 24 determines the difference (signal) between the signal level of the received signal pulse at the time of interest (first time) and the signal level of the received pulse signal at the second time immediately before that (signal). Calculate the level difference 1). Similarly, the signal level difference calculation unit 24 calculates the difference (signal level difference 2) between the signal level of the received signal pulse at the second time and the signal level of the received pulse signal at the third time immediately before that. (Step S22).

次に、雑音判定部は、式（７）の第３条件と式（８）の第４条件を両方とも満たすか否かを判定する（ステップＳ２３）。ステップＳ２３の条件の少なくとも一つを満たさない場合、干渉なしと判定する（ステップＳ２４）。 Next, the noise determination unit determines whether or not both the third condition of the equation (7) and the fourth condition of the equation (8) are satisfied (step S23). If at least one of the conditions in step S23 is not satisfied, it is determined that there is no interference (step S24).

なお、より詳細には、上述したステップＳ２２では、受信パルス信号の水平偏波信号と垂直偏波信号のそれぞれについての信号レベル差１と信号レベル差２を算出し、各偏波信号ごとに式（７）の第３条件と式（８）の第４条件を満たすか否かを判定し、いずれか一つの条件でも見たなさい場合は、干渉なしと判定する。 More specifically, in step S22 described above, the signal level difference 1 and the signal level difference 2 for each of the horizontally polarized signal and the vertically polarized signal of the received pulse signal are calculated, and an equation is used for each polarized signal. It is determined whether or not the third condition of (7) and the fourth condition of the formula (8) are satisfied, and if any one of the conditions is observed, it is determined that there is no interference.

ステップＳ２３のすべての条件を満たす場合、図３のステップＳ２〜Ｓ６と同様の処理を行う（ステップＳ２５〜Ｓ２８、Ｓ２３）。 When all the conditions of step S23 are satisfied, the same processing as in steps S2 to S6 of FIG. 3 is performed (steps S25 to S28, S23).

上述した図６及び図８のレーダ装置１の処理は、図５のレーダ装置１内の信号処理部１５で行ってもよい。この場合、図６及び図８のレーダ装置１の処理を、図５の信号処理部１５がハードウェアで実施してもよいし、少なくとも一部の処理をソフトウェアで実施してもよい。また、図６及び図８のレーダ装置１内の干渉判定部３の後段側に、図４の干渉除去部７と雨量推定部８を設けてもよい。 The processing of the radar device 1 of FIGS. 6 and 8 described above may be performed by the signal processing unit 15 in the radar device 1 of FIG. In this case, the processing of the radar device 1 of FIGS. 6 and 8 may be performed by the signal processing unit 15 of FIG. 5 by hardware, or at least a part of the processing may be performed by software. Further, the interference removing unit 7 and the rainfall estimation unit 8 of FIG. 4 may be provided on the rear side of the interference determining unit 3 in the radar device 1 of FIGS. 6 and 8.

より具体的には、信号処理部１５は、アンテナで受信された受信パルス信号の電力を示す信号レベルを算出し、信号レベルおよび雑音の電力を示す雑音レベルとのレベル差を算出し、レベル差にさらに基づいて、受信パルス信号が干渉を受けていないか否かを判定する。また、信号処理部１５は、レベル差が第３閾値未満である場合、干渉を受けていないと判定し、レベル差が第３閾値以上である場合、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定することができる。また、信号処理部１５は、アンテナで受信された受信パルス信号の電力を示す信号レベルを算出し、異なる時刻における信号レベルのレベル差を算出し、レベル差に基づいて雑音の影響を判定し、判定した雑音の影響にさらに基づいて、受信パルス信号が干渉を受けていないか否かを判定することができる。また、信号処理部１５は、第１時刻に受信された受信パルス信号の信号レベルおよび第１時刻の直前の受信となる第２時刻に受信された受信パルス信号の信号レベルとのレベル差が第４閾値より大きい第３条件と、第２時刻に受信された受信パルス信号の信号レベルおよび第２時刻の直前の受信となる第３時刻に受信された受信パルス信号の信号レベルとのレベル差が第５閾値未満である第４条件と、を満たした場合には、受信パルス信号は偏波間情報の差分に基づいて干渉を受けたか否かを判定し、第３条件及び第４条件の少なくとも一方を満たさない場合には、受信パルス信号干渉を受けていないと判定することができる。 More specifically, the signal processing unit 15 calculates the signal level indicating the power of the received pulse signal received by the antenna, calculates the level difference between the signal level and the noise level indicating the power of noise, and calculates the level difference. Further, it is determined whether or not the received pulse signal is interfered with. Further, the signal processing unit 15 determines that interference is not received when the level difference is less than the third threshold value, and when the level difference is greater than or equal to the third threshold value, the received pulse signal is based on the difference in the interpolarization information. Can be determined whether or not has been interfered with. Further, the signal processing unit 15 calculates a signal level indicating the power of the received pulse signal received by the antenna, calculates the level difference of the signal level at different times, determines the influence of noise based on the level difference, and determines the influence of noise. Based on the influence of the determined noise, it can be determined whether or not the received pulse signal is not interfered with. Further, the signal processing unit 15 has a level difference between the signal level of the received pulse signal received at the first time and the signal level of the received pulse signal received at the second time, which is the reception immediately before the first time. The level difference between the third condition larger than the four thresholds and the signal level of the received pulse signal received at the second time and the signal level of the received pulse signal received at the third time, which is the reception immediately before the second time. When the fourth condition, which is less than the fifth threshold value, is satisfied, it is determined whether or not the received pulse signal has been interfered with based on the difference in the information between the polarizations, and at least one of the third condition and the fourth condition is satisfied. If the above conditions are not satisfied, it can be determined that the received pulse signal is not interfered with.

このように、第２の実施形態では、信号対雑音レベル差算出部２２又は信号レベル差算出部２４を設けて、雑音と判断できる場合には干渉なしと判断するようにしたため、雑音信号を干渉信号と誤って判断するおそれを低減できる。 As described above, in the second embodiment, the signal-to-noise level difference calculation unit 22 or the signal level difference calculation unit 24 is provided so that if it can be determined to be noise, it is determined that there is no interference, so that the noise signal interferes. It is possible to reduce the risk of erroneously determining the signal as a signal.

（第３の実施形態）
第１及び第２の実施形態では、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定しているが、場合によっては、本来検出するべき所望信号と干渉信号の偏波間情報が同等になる場合がある。この場合、偏波間情報の差分が小さくなり、干渉信号の検出精度が低下してしまう。そこで、第３の実施形態では、所望信号と干渉信号の偏波間情報の差分に有意な差を生じさせるような送信パルス信号を送信することで、確実に干渉を検出するものである。 (Third Embodiment)
In the first and second embodiments, it is determined whether or not the received pulse signal is interfered based on the difference in the information between the polarizations, but in some cases, the bias between the desired signal and the interference signal that should be originally detected is determined. The wave information may be equivalent. In this case, the difference in the information between the polarizations becomes small, and the detection accuracy of the interference signal decreases. Therefore, in the third embodiment, interference is reliably detected by transmitting a transmission pulse signal that causes a significant difference in the difference between the polarization information of the desired signal and the interference signal.

図１０は第３の実施形態によるレーダ装置１の概略構成を示すブロック図、図１１は図１０のレーダ装置１の処理動作を模式的に示す図である。 FIG. 10 is a block diagram showing a schematic configuration of the radar device 1 according to the third embodiment, and FIG. 11 is a diagram schematically showing a processing operation of the radar device 1 of FIG.

図１１に示すように、図１０のレーダ装置１が少なくとも２台設けられており、２台とも同一の観測範囲に送信パルス信号を送信している。このとき、一方のレーダ装置１が他方のレーダ装置１に干渉信号を与える与干渉レーダ装置１ａであり、他方のレーダ装置１が与干渉レーダ装置１ａからの干渉信号を受ける被干渉レーダ装置１ｂである。 As shown in FIG. 11, at least two radar devices 1 of FIG. 10 are provided, and both of them transmit a transmission pulse signal to the same observation range. At this time, one radar device 1 is an interfering radar device 1a that gives an interference signal to the other radar device 1, and the other radar device 1 is an interfering radar device 1b that receives an interference signal from the interfering radar device 1a. is there.

本実施形態では、被干渉レーダ装置１ｂが偏波間情報を算出する際に、被干渉レーダ装置１ｂが本来受信するべき受信パルス信号（所望信号）と与干渉レーダ装置１ａからの送信パルス信号（干渉信号）とを確実に識別できるように、所望信号と干渉信号の偏波間情報（例えば偏波間位相差）の差を大きくするものである。 In the present embodiment, when the interfered radar device 1b calculates the interpolarization information, the received pulse signal (desired signal) that the interfered radar device 1b should originally receive and the transmitted pulse signal (interference) from the interfered radar device 1a. The difference between the polarization-to-polarization information (for example, the polarization-to-polarization phase difference) between the desired signal and the interference signal is increased so that the signal can be reliably identified.

図１０のレーダ装置１は、送受切替部１１と、ＩＱ検波部６と、偏波間状態復元部３１と、観測偏波間情報算出部３２と、偏波制御情報算出部３３と、送信偏波制御部３４とを備えている。図１１の与干渉レーダ装置１ａと被干渉レーダ装置１ｂのいずれも、図１０のレーダ装置１と同様の構成を備えている。 The radar device 1 of FIG. 10 includes a transmission / reception switching unit 11, an IQ detection unit 6, an interpolarization state restoration unit 31, an observation polarization information calculation unit 32, a polarization control information calculation unit 33, and transmission polarization control. It is provided with a unit 34. Both the interfering radar device 1a and the interfering radar device 1b of FIG. 11 have the same configuration as the radar device 1 of FIG.

観測偏波間情報算出部３２は、所定の観測範囲から反射された受信パルス信号の水平偏波信号と垂直偏波信号に基づいて、偏波間の関係を示す偏波間情報を算出する。 The observed polarization-to-polarization information calculation unit 32 calculates the polarization-to-polarization information indicating the relationship between the polarizations based on the horizontal polarization signal and the vertical polarization signal of the received pulse signal reflected from the predetermined observation range.

偏波制御情報算出部３３は、観測偏波間情報算出部３２で算出された偏波間情報に基づいて、送信パルス信号の偏波間情報を制御する制御情報を算出する。より具体的には、偏波制御情報算出部３３は、所望信号と干渉信号との偏波間位相差の差分を大きくするための制御情報を算出する。 The polarization control information calculation unit 33 calculates the control information for controlling the polarization information of the transmission pulse signal based on the polarization information calculated by the observation polarization information calculation unit 32. More specifically, the polarization control information calculation unit 33 calculates the control information for increasing the difference in the phase difference between the polarizations of the desired signal and the interference signal.

送信偏波制御部３４は、制御情報に基づいて送信パルス信号の偏波間情報を制御する。より具体的には、送信偏波制御部３４は、偏波制御情報算出部３３で算出された振幅制御情報又は位相制御情報を、送信パルス信号の水平偏波信号及び垂直偏波信号の少なくとも一方に乗じることにより、偏波間情報を制御する。 The transmission polarization control unit 34 controls the interpolarization information of the transmission pulse signal based on the control information. More specifically, the transmission polarization control unit 34 uses the amplitude control information or the phase control information calculated by the polarization control information calculation unit 33 at least one of the horizontally polarized signal and the vertically polarized signal of the transmitted pulse signal. The interpolarization information is controlled by multiplying by.

偏波制御情報算出部３３は、送信パルス信号の水平偏波信号及び垂直偏波信号の偏波間情報が、複数の受信パルス信号の水平偏波信号及び垂直偏波信号の偏波間情報と所定値以上異なるように、振幅制御情報又は位相制御情報を含む制御情報を算出する。 In the polarization control information calculation unit 33, the horizontal polarization signal of the transmission pulse signal and the polarization-to-polarization information of the vertical polarization signal are predetermined values with the polarization-to-polarization information of the horizontal polarization signal and the vertical polarization signal of the plurality of received pulse signals. As described above, the control information including the amplitude control information or the phase control information is calculated.

偏波間状態復元部３１は、制御情報に基づいて、送信パルス信号の偏波状態を復元する。より詳細には、偏波間状態復元部３１は、制御情報に基づいて、送信パルス信号の水平偏波信号及び垂直偏波信号の偏波状態を復元する。すなわち、偏波間状態復元部３１は、送信パルス信号を生成する際に考慮した偏波間情報に基づいて、元の偏波間状態を復元する。観測偏波間情報算出部３２は、偏波間状態復元部３１で復元された偏波間状態に基づいて、偏波間情報を算出する。 The interpolarization state restoration unit 31 restores the polarization state of the transmission pulse signal based on the control information. More specifically, the interpolarization state restoration unit 31 restores the polarization states of the horizontally polarized signal and the vertically polarized signal of the transmission pulse signal based on the control information. That is, the interpolar state restoration unit 31 restores the original interpolar state based on the interpolar information considered when generating the transmission pulse signal. The observed interpolar information calculation unit 32 calculates the interpolar information based on the interpolar state restored by the interpolar state restoration unit 31.

図１２は図１０のレーダ装置１の処理動作の一例を示すフローチャートである。以下では、偏波間位相差を制御する例に従い説明を行う。まず、偏波制御情報算出部３３は、以下の式（９）にて、送信パルス信号に対する制御情報（偏波間位相差情報）φcont,nを算出する（ステップＳ３１）。また、送信パルス信号の送信回数を示す変数ｎを１だけインクリメントする。
φcont,n＝φdp,n＋φA …（９） FIG. 12 is a flowchart showing an example of the processing operation of the radar device 1 of FIG. Hereinafter, description will be given according to an example of controlling the phase difference between polarizations. First, the polarization control information calculation unit 33 calculates control information (phase difference information between polarizations) φcont, n for the transmission pulse signal by the following equation (9) (step S31). In addition, the variable n indicating the number of transmissions of the transmission pulse signal is incremented by 1.
φcont, n ＝ φdp, n ＋ φA… (9)

式（９）において、φdp,nはｎ回目の観測で得られた所望信号の偏波間位相差であり、初回は事前に設定した初期値φ0である。φAは、所望信号と干渉信号の偏波間位相差を大きくするための値である。φAは、事前に設定してもよいし、運用中に所望信号の状態に応じて設定してもよい。 In the equation (9), φdp and n are the phase differences between the polarizations of the desired signal obtained in the nth observation, and the first time is the preset initial value φ0. φA is a value for increasing the phase difference between the polarizations of the desired signal and the interference signal. φA may be set in advance or may be set according to the state of the desired signal during operation.

次に、送信偏波制御部３４は、式（９）で算出した制御情報φcont,nに基づいて、送信パルス信号の水平偏波信号Ｓtx,h,nと垂直偏波信号Ｓtx,v,nの位相差を以下の式（１０）と式（１１）で制御する（ステップＳ３２）。
Ｓtx,h,n＝Ｓtx,h0 …（１０）
Ｓtx,v,n＝Ｓtx,v0×exp(1j×φcont,n) …（１１） Next, the transmission polarization control unit 34 sets the horizontal polarization signals Stx, h, n and the vertical polarization signals Stx, v, n of the transmission pulse signal based on the control information φcont, n calculated by the equation (9). The phase difference of is controlled by the following equations (10) and (11) (step S32).
Stx, h, n = Stx, h0… (10)
Stx, v, n = Stx, v0 × exp (1j × φcont, n)… (11)

Ｓtx,h,nとＳtx,v,nは、送信信号の水平偏波と垂直偏波の種信号である。1jは虚数単位である。式（１０）と式（１１）により、送信パルス信号の偏波間位相差がφcont,nとなるように制御することができる。 Stx, h, n and Stx, v, n are the seed signals of horizontally polarized waves and vertically polarized waves of the transmitted signal. 1j is an imaginary unit. According to the equations (10) and (11), the phase difference between the polarizations of the transmission pulse signal can be controlled to be φcont, n.

次に、与干渉レーダ装置１ａと被干渉レーダ装置１ｂは、送受切替部１１を介して送信偏波信号をアンテナ５から送信する（ステップＳ３３）。 Next, the interfering radar device 1a and the interfering radar device 1b transmit a transmission polarization signal from the antenna 5 via the transmission / reception switching unit 11 (step S33).

その後、被干渉レーダ装置１ｂは、アンテナ５にて受信パルス信号を受信し、ＩＱ検波部６にてＩＱ検波処理を行って、ＩＱ検波された水平偏波信号Ｓrx,h,nと垂直偏波信号Ｓrx,v,nを受信する（ステップＳ３４）。 After that, the interfering radar device 1b receives the received pulse signal at the antenna 5, performs IQ detection processing at the IQ detection unit 6, and performs IQ detection processing with the IQ-detected horizontally polarized signals Srx, h, n and vertically polarized waves. The signals Srx, v, n are received (step S34).

次に、偏波間状態復元部３１は、以下の式（１２）と式（１３）にて、送信時に制御した位相差を復元し、復元後の偏波信号Ｓrx',h,nとＳrx',v,nを生成する（ステップＳ３５）。
Ｓrx',h,n＝Ｓrx,h,n …（１２）
Ｓrx',v,n＝Ｓrx,v,n×exp(-1j×φcont,n) …（１３） Next, the interpolarization state restoration unit 31 restores the phase difference controlled at the time of transmission by the following equations (12) and (13), and the restored polarization signals Srx', h, n and Srx' , V, n are generated (step S35).
Srx', h, n = Srx, h, n ... (12)
Srx', v, n = Srx, v, n × exp (-1j × φcont, n)… (13)

上述した例では、式（１０）〜式（１３）からわかるように、偏波間位相差を大きくする処理は垂直偏波信号に対してのみ行っており、水平偏波信号の偏波間位相差はそのままである。ただし、水平偏波信号の偏波間位相差を大きくする処理を行ってもよい。また、水平偏波信号と垂直偏波信号の両方とも偏波間位相差を大きくする処理を行ってもよい。 In the above example, as can be seen from the equations (10) to (13), the process of increasing the phase difference between the polarized waves is performed only on the vertically polarized signal, and the phase difference between the polarized waves of the horizontally polarized signal is calculated. As it is. However, processing may be performed to increase the phase difference between the polarized waves of the horizontally polarized signal. Further, both the horizontally polarized signal and the vertically polarized signal may be processed to increase the phase difference between the polarized waves.

次に、式（１２）と式（１３）で生成された偏波信号Ｓrx',h,nとＳrx',v,nに基づいて、受信パルス信号の偏波間情報φdp,nを算出する（ステップＳ３６）。 Next, the interpolarization information φdp, n of the received pulse signal is calculated based on the polarization signals Srx', h, n and Srx', v, n generated by the equations (12) and (13) ( Step S36).

上述したステップＳ３１〜Ｓ３６の処理は、複数回繰り返される。なお、ステップＳ３１〜Ｓ３３の送信パルス信号の偏波間位相差制御は、必ずしも受信パルス信号を受信するたびに行う必要は無い。例えば、観測偏波間情報の差分の受信間隔毎の変動が小さい場合は、ステップＳ３１の制御情報を更新しなくてもよい。また、所定の期間ごと（例えば数時間ごと）に制御情報を更新してもよい。 The processes of steps S31 to S36 described above are repeated a plurality of times. The phase difference control between the polarizations of the transmission pulse signals in steps S31 to S33 does not necessarily have to be performed each time the reception pulse signal is received. For example, when the variation of the difference between the observed polarization information for each reception interval is small, it is not necessary to update the control information in step S31. Further, the control information may be updated every predetermined period (for example, every several hours).

上述した図１０のレーダ装置１は、干渉判定に関する処理ブロックを備えていないが、干渉判定に関する処理ブロックを追加してもよい。この場合、例えば図１３のような構成になる。図１３のレーダ装置１は、図１０の構成に加えて、偏波間情報差算出部２と、干渉判定部３とを備えている。偏波間情報差算出部２は、観測偏波間情報算出部３２で算出された観測偏波間情報に基づいて、偏波間情報差を算出する。 The radar device 1 of FIG. 10 described above does not include a processing block related to interference determination, but a processing block related to interference determination may be added. In this case, for example, the configuration is as shown in FIG. The radar device 1 of FIG. 13 includes an information difference calculation unit 2 between polarizations and an interference determination unit 3 in addition to the configuration of FIG. The interpolar information difference calculation unit 2 calculates the interpolar information difference based on the observed interpolar information calculated by the observed interpolar information calculation unit 32.

また、図１３の構成に加えて、図６の信号レベル算出部２１と信号対雑音レベル差算出部２２を追加してもよいし、あるいは８の信号レベル算出部２１と信号レベル差算出部２４を追加してもよい。さらに、図１０や図１３のレーダ装置１の処理は、図５のレーダ装置１内の信号処理部１５で行ってもよい。この場合、図１０や図１３のレーダ装置１の処理を、図５の信号処理部１５がハードウェアで実施してもよいし、少なくとも一部の処理をソフトウェアで実施してもよい。また、図１０や図１３のレーダ装置１内の干渉判定部３の後段側に、図４の干渉除去部７と雨量推定部８を設けてもよい。 Further, in addition to the configuration of FIG. 13, the signal level calculation unit 21 and the signal-to-noise level difference calculation unit 22 of FIG. 6 may be added, or the signal level calculation unit 21 and the signal level difference calculation unit 24 of 8 may be added. May be added. Further, the processing of the radar device 1 of FIGS. 10 and 13 may be performed by the signal processing unit 15 in the radar device 1 of FIG. In this case, the processing of the radar device 1 of FIGS. 10 and 13 may be performed by the signal processing unit 15 of FIG. 5 by hardware, or at least a part of the processing may be performed by software. Further, the interference removing unit 7 and the rainfall estimation unit 8 of FIG. 4 may be provided on the rear side of the interference determining unit 3 in the radar device 1 of FIGS. 10 and 13.

より具体的には、信号処理部１５は、受信パルス信号における偏波間の関係を示す偏波間情報を算出し、受信パルス信号の偏波間情報に基づいて、送信パルス信号における偏波間の関係を示す偏波間情報を制御する制御情報を算出し、制御情報に基づいて、送信パルス信号の偏波間情報を制御し、制御情報に基づいて、送信パルス信号の偏波状態を復元し、偏波状態が復元された送信パルス信号の偏波間情報を算出する。また、信号処理部１５は、送信パルス信号の水平偏波信号及び垂直偏波信号の偏波間情報を制御するための制御情報を算出し、制御情報に基づいて、送信パルス信号の水平偏波信号及び垂直偏波信号の偏波間情報を制御し、制御情報に基づいて、送信パルス信号の水平偏波信号及び垂直偏波信号の偏波状態を復元することができる。制御情報は、振幅および位相の少なくとも一方を制御する情報であり、信号処理部１５は、制御情報を、送信パルス信号の水平偏波信号及び垂直偏波信号に乗じることにより、送信パルス信号の偏波間情報を制御することができる。また、信号処理部１５は、送信パルス信号の水平偏波信号及び垂直偏波信号の偏波間情報が、受信パルス信号の水平偏波信号及び垂直偏波信号の偏波間情報と所定値以上異なるように、制御情報を算出することができる。また、信号処理部１５は、複数の受信パルス信号における偏波間情報の差分を算出し、受信パルス信号における偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定することができる。また、信号処理部１５は、処理部で算出された送信パルス信号の偏波間情報に基づいて、アンテナから送信される送信予定パルス信号の送信予定偏波間情報を制御し、切替器は、送信予定偏波間情報が制御された送信予定パルス信号をアンテナに送出することができる。 More specifically, the signal processing unit 15 calculates the interpolar information indicating the relationship between the polarizations in the received pulse signal, and shows the relationship between the polarizations in the transmission pulse signal based on the interpolar information of the received pulse signal. The control information that controls the interpolarization information is calculated, the interpolarization information of the transmission pulse signal is controlled based on the control information, the polarization state of the transmission pulse signal is restored based on the control information, and the polarization state is changed. Calculate the interpolarization information of the restored transmission pulse signal. Further, the signal processing unit 15 calculates control information for controlling the horizontally polarized signal of the transmitted pulse signal and the interpolarized information of the vertically polarized signal, and based on the control information, the horizontally polarized signal of the transmitted pulse signal. And the information between the polarizations of the vertically polarized signal can be controlled, and the polarization state of the horizontally polarized signal and the vertically polarized signal of the transmission pulse signal can be restored based on the control information. The control information is information that controls at least one of the amplitude and the phase, and the signal processing unit 15 multiplies the control information by the horizontally polarized signal and the vertically polarized signal of the transmitted pulse signal, thereby biasing the transmitted pulse signal. The wave information can be controlled. Further, the signal processing unit 15 makes the interpolarization information of the horizontally polarized signal and the vertically polarized signal of the transmission pulse signal different from the interpolarized information of the horizontally polarized signal and the vertically polarized signal of the received pulse signal by a predetermined value or more. In addition, control information can be calculated. Further, the signal processing unit 15 calculates the difference in the interpolarity information in the plurality of received pulse signals, and determines whether or not the received pulse signal has been interfered with based on the difference in the interpolarity information in the received pulse signal. it can. Further, the signal processing unit 15 controls the transmission scheduled polarization-to-polarization information of the transmission scheduled pulse signal transmitted from the antenna based on the polarization-to-polarization information of the transmission pulse signal calculated by the processing unit, and the switch is scheduled to transmit. A scheduled transmission pulse signal with controlled interpolar information can be sent to the antenna.

このように、第３の実施形態では、干渉レーダ装置１から送信される送信パルス信号を干渉信号として受信する被干渉レーダ装置１ｂが受信処理を行う際に、所望信号と干渉信号の偏波間位相差に有意な差が生じるように、干渉レーダ装置１から送信される送信パルス信号の垂直偏波の振幅値を制御する。これにより、被干渉レーダ装置１ｂでは所望信号と干渉信号とを明確に区別でき、干渉信号を誤って所望信号と見なすおそれを軽減できる。 As described above, in the third embodiment, when the interfered radar device 1b that receives the transmission pulse signal transmitted from the interference radar device 1 as an interference signal performs reception processing, the polarization interval between the desired signal and the interference signal The amplitude value of the vertically polarized light of the transmission pulse signal transmitted from the interference radar device 1 is controlled so that a significant difference occurs in the phase difference. As a result, the interfered radar device 1b can clearly distinguish the desired signal from the interfered signal, and can reduce the possibility that the interfered signal is mistakenly regarded as the desired signal.

（第４の実施形態）
観測範囲内に存在する粒子形状によって、受信パルス信号の信号レベルが変化し、偏波間情報の差分にも影響を与え、所望信号を干渉信号と誤ってみなすおそれがある。より具体的には、所望信号が雹のような固体粒子の場合、所望信号の偏波間情報の差分がより大きくなる可能性があり、所望信号を干渉信号と誤って判断するおそれがある。そこで、第４の実施形態では、粒子が固体か否かを判定することにより、観測範囲内の液体粒子で反射された受信パルス信号が受信された場合のみ、偏波間情報の差分を用いた干渉検出処理を行うものである。 (Fourth Embodiment)
Depending on the shape of the particles existing in the observation range, the signal level of the received pulse signal changes, which affects the difference in information between polarizations, and there is a risk that the desired signal is mistakenly regarded as an interference signal. More specifically, when the desired signal is a solid particle such as hail, the difference in the information between the polarizations of the desired signal may be larger, and the desired signal may be erroneously determined as an interference signal. Therefore, in the fourth embodiment, by determining whether or not the particles are solid, interference using the difference in information between polarizations is used only when the received pulse signal reflected by the liquid particles within the observation range is received. It performs detection processing.

図１４は第４の実施形態によるレーダ装置１の概略構成を示すブロック図である。図１４のレーダ装置１は、ＩＱ検波部６と、粒子判定部３５と、偏波間情報差利用決定部３６と、偏波間情報算出部４と、偏波間情報差算出部２と、干渉判定部３とを備えている。 FIG. 14 is a block diagram showing a schematic configuration of the radar device 1 according to the fourth embodiment. The radar device 1 of FIG. 14 includes an IQ detection unit 6, a particle determination unit 35, an interpolar information difference utilization determination unit 36, an interpolar information calculation unit 4, an interpolar information difference calculation unit 2, and an interference determination unit. It has 3 and.

ＩＱ検波部６は、受信パルス信号の水平偏波信号と垂直偏波信号に対してＩＱ検波処理を行い、ＩＱ検波後の水平偏波信号と垂直偏波信号に基づいて、所望信号のレーダ反射因子、ドップラ速度、偏波間情報等の所望信号の情報を推定する。 The IQ detection unit 6 performs IQ detection processing on the horizontally polarized signal and the vertically polarized signal of the received pulse signal, and radar reflection of the desired signal based on the horizontally polarized signal and the vertically polarized signal after IQ detection. Estimate desired signal information such as factors, Doppler velocity, and interpolarization information.

粒子判定部３５は、推定された所望信号に基づいて、粒子が固体か液体かの粒子判定を行う。粒子判定の手法は、レーダ反射因子やレーダ反射因子差を用いたファジーロジック・アルゴリズムなどを用いる。より具体的に説明すると、レーダ反射因子やレーダ反射因子差と粒子の状態を関係づけるメンバシップ関数を生成し、それぞれのメンバシップ関数の和集合に基づいて粒子形状を判定する。 The particle determination unit 35 determines whether the particles are solid or liquid based on the estimated desired signal. As a particle determination method, a fuzzy logic algorithm using a radar reflection factor or a radar reflection factor difference is used. More specifically, a membership function that associates the radar reflection factor or the radar reflection factor difference with the state of the particle is generated, and the particle shape is determined based on the union of the respective membership functions.

偏波間情報差利用決定部３６は、粒子判定を行った結果、雨水と判定された場合のみ、偏波間情報差を利用することを決定する。偏波間情報差利用決定部３６で、偏波間情報差の利用が決定されると、偏波間情報算出部４にて偏波間情報が算出され、続いて偏波間情報差算出部２にて偏波間情報の差分が算出され、算出された差分に基づいて干渉判定部３にて干渉を受けているか否かの判定処理が行われる。干渉判定部３は、粒子判定部３５にて液体と判定されると、偏波間情報の差分に基づいて複数の受信パルス信号が干渉を受けたか否かを判定し、粒子判定部３５にて固体と判定されると、偏波間情報の差分に基づく干渉判定を停止する。 The interpolar information difference utilization determination unit 36 determines to use the interpolar information difference only when it is determined that it is rainwater as a result of particle determination. When the interpolar information difference utilization determination unit 36 determines the use of the interpolar information difference, the interpolar information calculation unit 4 calculates the interpolar information, and then the interpolar information difference calculation unit 2 calculates the interpolar information. The difference in information is calculated, and based on the calculated difference, the interference determination unit 3 performs determination processing as to whether or not interference is received. When the particle determination unit 35 determines that the liquid is liquid, the interference determination unit 3 determines whether or not a plurality of received pulse signals have been interfered with each other based on the difference in the information between polarizations, and the particle determination unit 35 determines whether or not the plurality of received pulse signals have been interfered with. If it is determined, the interference determination based on the difference in the information between the polarizations is stopped.

上述した図１４のレーダ装置１の処理は、図５のレーダ装置１内の信号処理部１５で行ってもよい。この場合、図１４のレーダ装置１の処理を、図５の信号処理部１５がハードウェアで実施してもよいし、少なくとも一部の処理をソフトウェアで実施してもよい。また、図１４のレーダ装置１内の干渉判定部３の後段側に、図４の干渉除去部７と雨量推定部８を設けてもよい。 The processing of the radar device 1 of FIG. 14 described above may be performed by the signal processing unit 15 in the radar device 1 of FIG. In this case, the processing of the radar device 1 of FIG. 14 may be performed by the signal processing unit 15 of FIG. 5 by hardware, or at least a part of the processing may be performed by software. Further, the interference removing unit 7 and the rainfall estimation unit 8 of FIG. 4 may be provided on the rear side of the interference determining unit 3 in the radar device 1 of FIG.

より具体的には、信号処理部１５は、観測対象の粒子が液体であるか固体であるかを判定し、液体と判定した場合、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定し、固体と判定した場合、偏波間情報の差分に基づいて受信パルス信号が干渉を受けたか否かを判定しない。 More specifically, the signal processing unit 15 determines whether the particle to be observed is a liquid or a solid, and when it is determined to be a liquid, the received pulse signal is interfered with based on the difference in the information between polarizations. When it is determined whether or not the signal is solid, it is not determined whether or not the received pulse signal has been interfered with based on the difference in the information between the polarizations.

このように、第４の実施形態では、受信パルス信号をＩＱ検波した後に粒子判定を行い、粒子が液体であると判定された場合のみ、偏波間情報の差分に基づく干渉判定を行うため、干渉判定の精度を向上できる。 As described above, in the fourth embodiment, the particle determination is performed after IQ detection of the received pulse signal, and the interference determination is performed based on the difference in the interpolar information only when the particle is determined to be liquid. The accuracy of judgment can be improved.

上述した実施形態で説明したレーダ装置１の少なくとも一部は、ハードウェアで構成してもよいし、ソフトウェアで構成してもよい。ソフトウェアで構成する場合には、レーダ装置１の少なくとも一部の機能を実現するプログラムをフレキシブルディスクやＣＤ−ＲＯＭ等の記録媒体に収納し、コンピュータに読み込ませて実行させてもよい。記録媒体は、磁気ディスクや光ディスク等の着脱可能なものに限定されず、ハードディスク装置やメモリなどの固定型の記録媒体でもよい。 At least a part of the radar device 1 described in the above-described embodiment may be configured by hardware or software. When configured by software, a program that realizes at least a part of the functions of the radar device 1 may be stored in a recording medium such as a flexible disk or a CD-ROM, read by a computer, and executed. The recording medium is not limited to a removable one such as a magnetic disk or an optical disk, and may be a fixed recording medium such as a hard disk device or a memory.

また、レーダ装置１の少なくとも一部の機能を実現するプログラムを、インターネット等の通信回線（無線通信も含む）を介して頒布してもよい。さらに、同プログラムを暗号化したり、変調をかけたり、圧縮した状態で、インターネット等の有線回線や無線回線を介して、あるいは記録媒体に収納して頒布してもよい。 Further, a program that realizes at least a part of the functions of the radar device 1 may be distributed via a communication line (including wireless communication) such as the Internet. Further, the program may be encrypted, modulated, compressed, and distributed via a wired line or wireless line such as the Internet, or stored in a recording medium.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

１ レーダ装置、２ 偏波間情報差算出部、３ 干渉判定部、４ 偏波間情報算出部、５ アンテナ、６ ＩＱ検波部、７ 干渉除去部、８ 雨量推定部、１１ 送受切替部、１２ 電力増幅部、１３ 低雑音増幅部、１４ 周波数変換部、１５ 信号処理部、１６ 送信制御部、１７ データ変換部、１８ データ表示部、１９ データ蓄積部、２１ 信号レベル算出部、２２ 信号対雑音レベル差算出部、２３ 第１雑音判定部、２４ 信号レベル差算出部、２５ 第２雑音判定部、３１ 偏波間状態復元部、３２ 観測偏波間情報算出部、３３ 偏波制御情報算出部、３４ 送信偏波制御部、粒子判定部、３６ 偏波間情報差利用決定部 1 Radar device, 2 Interpolar information difference calculation unit, 3 Interference judgment unit, 4 Interpolar information calculation unit, 5 Antenna, 6 IQ detection unit, 7 Interference removal unit, 8 Rainfall estimation unit, 11 Transmission / reception switching unit, 12 Power amplification Unit, 13 Low noise amplification unit, 14 Frequency conversion unit, 15 Signal processing unit, 16 Transmission control unit, 17 Data conversion unit, 18 Data display unit, 19 Data storage unit, 21 Signal level calculation unit, 22 Signal vs. noise level difference Calculation unit, 23 1st noise determination unit, 24 signal level difference calculation unit, 25 2nd noise determination unit, 31 interpolarization state restoration unit, 32 observed interpolarization information calculation unit, 33 polarization control information calculation unit, 34 transmission bias Wave control unit, particle determination unit, 36 information difference utilization determination unit between polarizations

Claims (18)

所定の観測範囲に向けて送信された送信パルス信号が反射された受信パルス信号を受信するレーダ装置であって、
前記受信パルス信号における偏波間の関係を示す偏波間情報、および複数の前記受信パルス信号における前記偏波間情報の差分を算出し、
前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定する、処理部を備える、レーダ装置。 A radar device that receives a received pulse signal that is a reflection of a transmitted pulse signal transmitted toward a predetermined observation range.
The difference between the polarization-to-polarization information indicating the relationship between the polarizations in the received pulse signal and the polarization-to-polarization information in the plurality of received pulse signals is calculated.
A radar device including a processing unit that determines whether or not the received pulse signal has been interfered with based on the difference in information between polarizations. 前記処理部は、第１時刻に受信された前記受信パルス信号および前記第１時刻の直前の受信となる第２時刻に受信された前記受信パルス信号における前記偏波間情報の差分が第１閾値よりも大きい第１条件を満たした場合には、前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定し、前記第１条件を満たさない場合は干渉を受けていないと判定する、請求項１に記載のレーダ装置。 In the processing unit, the difference between the polarization-to-polarization information between the received pulse signal received at the first time and the received pulse signal received at the second time, which is the reception immediately before the first time, is greater than the first threshold value. When the first condition is satisfied, it is determined whether or not the received pulse signal is interfered based on the difference between the polarization information, and when the first condition is not satisfied, the received pulse signal is not interfered. The radar device according to claim 1, wherein the radar device is determined to be. 前記処理部は、前記第２時刻に受信された前記受信パルス信号および前記第２時刻の直前の受信となる第３時刻に受信された前記受信パルス信号における前記偏波間情報の差分が第２閾値未満である第２条件および前記第１条件を満たした場合には、前記受信パルス信号は干渉を受けたと判定し、前記第１条件及び前記第２条件の少なくとも一方を満たさない場合には、前記受信パルス信号は干渉を受けていないと判定する、請求項２に記載のレーダ装置。 In the processing unit, the difference between the inter-polarization information in the received pulse signal received at the second time and the received pulse signal received at the third time, which is the reception immediately before the second time, is the second threshold value. If the second condition and the first condition are less than, it is determined that the received pulse signal has been interfered, and if at least one of the first condition and the second condition is not satisfied, the received pulse signal is determined to have been interfered. The radar device according to claim 2, wherein the received pulse signal is determined not to be interfered with. 前記処理部は、前記受信パルス信号の電力を示す信号レベルを算出し、
前記信号レベルおよび雑音の電力を示す雑音レベルとのレベル差を算出し、
前記レベル差にさらに基づいて、前記受信パルス信号が干渉を受けたか否かを判定する、請求項１乃至３のいずれか一項に記載のレーダ装置。 The processing unit calculates a signal level indicating the power of the received pulse signal, and calculates the signal level.
The level difference between the signal level and the noise level indicating the power of the noise is calculated.
The radar device according to any one of claims 1 to 3, further determining whether or not the received pulse signal has been interfered with based on the level difference. 前記処理部は、前記レベル差が第３閾値未満である場合、干渉を受けていないと判定し、前記レベル差が前記第３閾値以上である場合、前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定する、請求項４に記載のレーダ装置。 When the level difference is less than the third threshold value, the processing unit determines that interference is not received, and when the level difference is equal to or more than the third threshold value, the reception unit is based on the difference in the interpolarization information. The radar device according to claim 4, wherein it determines whether or not the pulse signal has been interfered with. 前記処理部は、前記受信パルス信号の電力を示す信号レベルを算出し、
異なる時刻における前記信号レベルのレベル差を算出し、
前記レベル差に基づいて雑音の影響を判定し、
判定した前記雑音の影響にさらに基づいて、前記受信パルス信号が干渉を受けたか否かを判定する、請求項１乃至３のいずれか一項に記載のレーダ装置。 The processing unit calculates a signal level indicating the power of the received pulse signal, and calculates the signal level.
Calculate the level difference of the signal level at different times and
The influence of noise is determined based on the level difference, and the effect is determined.
The radar device according to any one of claims 1 to 3, further determining whether or not the received pulse signal has been interfered with based on the determined influence of the noise. 前記処理部は、第１時刻に受信された前記受信パルス信号の前記信号レベルおよび前記第１時刻の直前の受信となる第２時刻に受信された前記受信パルス信号の前記信号レベルとのレベル差が第４閾値より大きい第３条件と、前記第２時刻に受信された前記受信パルス信号の信号レベルおよび前記第２時刻の直前の受信となる第３時刻に受信された前記受信パルス信号の前記信号レベルとのレベル差が第５閾値未満である第４条件と、を満たした場合には、前記受信パルス信号の前記偏波間情報の差分に基づいて干渉を受けたか否かを判定し、前記第３条件及び前記第４条件の少なくとも一方を満たさない場合には、前記受信パルス信号が干渉を受けていないと判定する、請求項６に記載のレーダ装置。 The processing unit has a level difference between the signal level of the received pulse signal received at the first time and the signal level of the received pulse signal received at the second time which is the reception immediately before the first time. The third condition that is larger than the fourth threshold, the signal level of the received pulse signal received at the second time, and the received pulse signal received at the third time that is received immediately before the second time. When the fourth condition that the level difference from the signal level is less than the fifth threshold is satisfied, it is determined whether or not interference has been received based on the difference in the interpolar information of the received pulse signal, and the above-mentioned The radar device according to claim 6, wherein if at least one of the third condition and the fourth condition is not satisfied, it is determined that the received pulse signal is not interfered with. 前記受信パルス信号が干渉を受けているか否かを判定された結果を示す情報を出力する出力部をさらに備える、請求項１乃至７のいずれか一項に記載のレーダ装置。 The radar device according to any one of claims 1 to 7, further comprising an output unit that outputs information indicating a result of determining whether or not the received pulse signal is receiving interference. 所定の観測範囲に向けて送信パルス信号を送信し、前記送信パルス信号が前記観測範囲で反射された受信パルス信号を受信するレーダ装置であって、
前記受信パルス信号を受信する受信部と、
前記送信パルス信号の送信および前記受信パルス信号の受信を切り替える切替器と、
前記受信パルス信号に基づいて、前記受信パルス信号に対応する前記送信パルス信号を復元し、
復元された前記送信パルス信号に基づいて、前記受信パルス信号における偏波間の関係を示す偏波間情報を算出し、
前記受信パルス信号の偏波間情報に基づいて、前記送信パルス信号における偏波間の関係を示す偏波間情報を制御する制御情報を算出する、処理部と、
を備える、レーダ装置。 A radar device that transmits a transmission pulse signal toward a predetermined observation range and receives the reception pulse signal reflected by the transmission pulse signal in the observation range.
A receiving unit that receives the received pulse signal and
A switch that switches between transmission of the transmission pulse signal and reception of the reception pulse signal, and
Based on the received pulse signal, the transmitted pulse signal corresponding to the received pulse signal is restored.
Based on the restored transmission pulse signal, the interpolar information indicating the relationship between the polarizations in the received pulse signal is calculated.
Based on the interpolarization information of the received pulse signal, the processing unit and the processing unit that calculate the control information for controlling the interpolarization information indicating the relationship between the polarizations in the transmission pulse signal.
A radar device. 前記処理部は、前記送信パルス信号における水平偏波信号及び垂直偏波信号を復元し、
前記送信パルス信号における水平偏波信号及び垂直偏波信号に基づいて、前記受信パルス信号における水平偏波信号及び垂直偏波信号の偏波間情報を算出し、
前記受信パルス信号における水平偏波信号及び垂直偏波信号の偏波間情報に基づいて、前記送信パルス信号における水平偏波信号及び垂直偏波信号の偏波間情報を制御する前記制御情報を算出する、
請求項９に記載のレーダ装置。 The processing unit restores the horizontally polarized signal and the vertically polarized signal in the transmitted pulse signal, and restores the horizontally polarized signal and the vertically polarized signal.
Based on the horizontally polarized signal and the vertically polarized signal in the transmitted pulse signal, the interpolarization information of the horizontally polarized signal and the vertically polarized signal in the received pulse signal is calculated.
Based on the interpolarization information of the horizontally polarized signal and the vertically polarized signal in the received pulse signal, the control information for controlling the interpolarized information of the horizontally polarized signal and the vertically polarized signal in the transmitted pulse signal is calculated.
The radar device according to claim 9. 前記制御情報は、前記送信パルス信号における水平偏波信号及び垂直偏波信号の、振幅および位相の少なくとも一方を制御する情報であり、
前記処理部は、前記制御情報を前記送信パルス信号における水平偏波信号及び垂直偏波信号に乗じることにより、前記送信パルス信号の前記偏波間情報を制御する、請求項１０に記載のレーダ装置。 The control information is information that controls at least one of the amplitude and the phase of the horizontally polarized signal and the vertically polarized signal in the transmitted pulse signal.
The radar device according to claim 10, wherein the processing unit controls the interpolarization information of the transmission pulse signal by multiplying the horizontally polarized signal and the vertically polarized signal of the transmission pulse signal. 前記処理部は、前記送信パルス信号における前記水平偏波信号及び前記垂直偏波信号の前記偏波間情報が、前記受信パルス信号における水平偏波信号及び垂直偏波信号の前記偏波間情報と所定値以上異なるように、前記制御情報を算出する、請求項１０又は１１に記載のレーダ装置。 In the processing unit, the interpolarization information of the horizontally polarized signal and the vertically polarized signal in the transmitted pulse signal is a predetermined value with the interpolarized information of the horizontally polarized signal and the vertically polarized signal in the received pulse signal. The radar device according to claim 10 or 11, which calculates the control information so as described above. 前記処理部は、複数の前記受信パルス信号における前記偏波間情報の差分を算出し、
前記受信パルス信号における前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定する、請求項９乃至１２のいずれか一項に記載のレーダ装置。 The processing unit calculates the difference in the information between the polarizations in the plurality of received pulse signals, and calculates the difference between the polarization information.
The radar device according to any one of claims 9 to 12, wherein it is determined whether or not the received pulse signal has been interfered with based on the difference in the information between polarizations in the received pulse signal. 前記処理部は、前記制御情報に基づいて、前記送信パルス信号を制御し、
前記切替器は、制御された前記送信パルス信号をアンテナに送出する、請求項９乃至１３のいずれか一項に記載のレーダ装置。 The processing unit controls the transmission pulse signal based on the control information.
The radar device according to any one of claims 9 to 13, wherein the switch transmits the controlled transmission pulse signal to the antenna. 前記受信パルス信号が干渉を受けているか否かを判定された結果を示す情報を出力する出力部をさらに備える、請求項９乃至１４のいずれか一項に記載のレーダ装置。 The radar device according to any one of claims 9 to 14, further comprising an output unit that outputs information indicating a result of determining whether or not the received pulse signal is receiving interference. 前記処理部は、観測対象の粒子が液体であるか固体であるかを判定し、
液体と判定した場合、前記受信パルス信号の前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定し、固体と判定した場合、前記受信パルス信号の前記偏波間情報の差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定しない、請求項１乃至８、及び１３のいずれか一項に記載のレーダ装置。 The processing unit determines whether the particles to be observed are liquid or solid, and determines whether the particles to be observed are liquid or solid.
When it is determined to be liquid, it is determined whether or not the received pulse signal has been interfered based on the difference in the interpolar information of the received pulse signal, and when it is determined to be solid, the interpolar information of the received pulse signal is determined. The radar device according to any one of claims 1 to 8 and 13, wherein it is not determined whether or not the received pulse signal has been interfered with based on the difference between the two. 前記受信パルス信号は、水平偏波信号及び垂直偏波信号を含んでおり、
前記受信パルス信号の前記偏波間情報は、水平偏波信号及び垂直偏波信号についての偏波間位相差、レーダ反射因子、偏波間位相係数、又は偏波間位相差変化率の少なくとも一つを含む情報である、請求項１乃至１６のいずれか一項に記載のレーダ装置。 The received pulse signal includes a horizontally polarized signal and a vertically polarized signal.
The interpolarization information of the received pulse signal includes at least one of the interpolarization phase difference, the radar reflection factor, the interpolarization phase coefficient, or the interpolarization phase difference change rate for the horizontally polarized signal and the vertically polarized signal. The radar device according to any one of claims 1 to 16. 所定の観測範囲に向けて送信された送信パルス信号が反射された受信パルス信号を受信するレーダ装置における干渉判定方法であって、
前記受信パルス信号における偏波間の関係を示す偏波間情報、および前記受信パルス信号における前記偏波間情報の差分を算出し、
前記差分に基づいて前記受信パルス信号が干渉を受けたか否かを判定する、干渉判定方法。 It is an interference determination method in a radar device that receives a received pulse signal that is a reflection of a transmitted pulse signal transmitted toward a predetermined observation range.
The difference between the interpolar information indicating the relationship between the polarizations in the received pulse signal and the interpolar information in the received pulse signal is calculated.
An interference determination method for determining whether or not the received pulse signal has been interfered with based on the difference.
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