JP2008096337A - Interfering signal removal method - Google Patents
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この発明はパルス圧縮法を用いるレーダ装置における妨害信号を除去するための妨害信号除去方法に関するものである。
The present invention relates to an interference signal removal method for removing an interference signal in a radar apparatus using a pulse compression method.
従来は妨害波をキャンセルする装置として、探知目標方向に主ビームを有するアンテナパターンからなる主アンテナと、その主アンテナの主ビーム方向から電波を受信することなく、主ビーム以外の方向から電波を受信するアンテナパターンからなる補助アンテナとを備えたものがあった。この装置の動作としては、主アンテナにより探知目標からの目標信号に妨害装置からの妨害電波が重畳されて受信されるが、補助アンテナにより別途妨害電波を受信し、主アンテナにより受信された電波（目標信号＋妨害電波）から補助アンテナにより受信された電波（妨害電波）を除くことにより、その妨害電波の影響を除去するものである。 Conventionally, as a device for canceling interference waves, a main antenna consisting of an antenna pattern having a main beam in the detection target direction, and receiving radio waves from directions other than the main beam without receiving radio waves from the main beam direction of the main antenna Some have an auxiliary antenna made of an antenna pattern. The operation of this device is that the main antenna receives the target signal from the target to be detected by superimposing the jamming signal from the jamming device, but the auxiliary antenna receives the jamming signal separately and receives the radio signal received by the main antenna ( By removing the radio wave (interfering radio wave) received by the auxiliary antenna from the target signal + interfering radio wave), the influence of the interfering radio wave is removed.
また、従来の別の手法として、注目する受信データ（注目データ）と、その前後にある複数の受信データ（参照データ）の振幅比較によって妨害データを除去する手法も考案されていた。この手法について図１に示す。 Further, as another conventional method, a method has been devised in which interference data is removed by comparing amplitudes of received data (attention data) of interest and a plurality of received data (reference data) before and after the received data. This technique is shown in FIG.
図１は注目データ１０１（掃引ｎ）と参照データ４個の場合の例である。図中の掃引ｎ−２から掃引ｎ＋２は、それぞれ連続したパルス送信タイミングに対応して受信された信号の、ある同一レンジの信号であり、パルス検波された振幅データである。これら５個のデータはソート回路１０３に入力され、小さい順もしくは大きな順に並べ替えられる。 FIG. 1 shows an example in the case of attention data 101 (sweep n) and four pieces of reference data. In the figure, sweep n-2 to sweep n + 2 are signals in a certain same range of signals received corresponding to successive pulse transmission timings, and are amplitude data subjected to pulse detection. These five pieces of data are input to the sort circuit 103, and are rearranged in ascending or descending order.
並べ替えられたデータはデータセレクタ１０５に入力される。データセレクタではあらかじめ決めた、小さい方から３番目、といった規定番目のデータを選択し出力する。 The rearranged data is input to the data selector 105. The data selector selects and outputs a predetermined number of data, such as a predetermined third number from the smallest.
対象とするレーダ装置Ａと、そのレーダ装置が送信する信号の周波数と同一な周波数を使用する他のレーダ装置Ｂがあった場合、Ａの送信信号が山や建物などの物標において反射して再びＡに戻ってくる信号よりも、Ａに進入するＢの信号の方が充分に大きな振幅を持つため、データセレクタにおいて最も振幅が大きいと判断したデータ以外の、上記のような３番目などのデータを使用すれば、つまり妨害波とみなされる掃引については置き換えを施すことにより、妨害信号の影響を受けることは無くなる。 When there is a target radar device A and another radar device B that uses the same frequency as the signal transmitted by the radar device, the transmission signal of A is reflected on a target such as a mountain or a building. Since the B signal entering A has a sufficiently larger amplitude than the signal returning to A again, the third or the like as described above other than the data determined to have the largest amplitude in the data selector If data is used, that is, a sweep that is regarded as a disturbing wave is replaced, it is not affected by the disturbing signal.
また、下記特許文献１のような、受信データをフーリエ変換し、不連続にフーリエ係数が増大している箇所を除去することによる妨害信号除去装置も提案されている。
しかるにこういった従来手法ではパルス圧縮レーダ装置では使用することはできない。なぜならば、パルス圧縮処理においては信号の位相にも情報が含まれており重要な役割を果たしているのであるが、前述のような掃引データの入れ替えを行うと位相情報が不連続になってしまうからである。 However, such a conventional method cannot be used in a pulse compression radar apparatus. This is because in the pulse compression process, information is also included in the phase of the signal and plays an important role. However, if the sweep data is replaced as described above, the phase information becomes discontinuous. It is.
本発明はパルス圧縮レーダ装置においても位相情報の不連続無く、妨害信号を除去する手段を提供するものである。
The present invention provides means for removing an interference signal without discontinuity in phase information even in a pulse compression radar apparatus.
本発明にかかる妨害信号除去方式は、
パルス圧縮法を用いたレーダ装置において、パルス圧縮直前における受信データ列における注目データと、該注目データの前後に連なる１個以上の参照データからなる合計ｎ１個のデータを用い、該ｎ１個のデータを振幅によりソートする第一並べ替え手段と、並べ替えた結果のｍ１番目のデータに常数ｐ１を乗じた積を閾値ｑ１とする第一閾値算出手段と、該閾値ｑ１と前記注目データの振幅を比較する第一振幅比較手段と、比較した結果として注目データの振幅が大きかった場合に注目データに妨害波が存在すると判定する第一妨害波有無判定手段と、妨害波が存在する場合に注目データをゼロに置き換える処理を行い又妨害波が存在しない場合には注目データに手を加えない第一妨害信号除去手段と、パルス圧縮直後における注目データと、該注目データの前後に連なる１個以上の参照データからなる合計ｎ２個のデータを用い、該ｎ２個のデータを振幅によりソートする第二並べ替え手段と、並べ替えた結果のｍ２番目のデータに常数ｐ２を乗じた積を閾値ｑ２とする第二閾値算出手段と、該閾値ｑ２と前記注目データの振幅を比較する第二振幅比較手段と、比較した結果として注目データの振幅が大きかった場合に注目データに二次的妨害波が存在すると判定する第二妨害波有無判定手段と、二次的妨害波が存在する場合に注目データをゼロに置き換える処理を行い又二次的妨害波が存在しない場合には注目データに手を加えない第二妨害信号除去手段とからなる妨害信号除去方式であるとする。
The interference signal elimination method according to the present invention is:
In a radar apparatus using the pulse compression method, a total of n1 data including attention data in a received data string immediately before pulse compression and one or more reference data connected before and after the attention data are used, and the n1 data First sorting means for sorting the values according to amplitude, first threshold value calculating means for setting the product of the m1th data of the sorted result by a constant p1 as a threshold value q1, and the threshold value q1 and the amplitude of the data of interest First amplitude comparison means for comparison, first interference wave presence / absence determination means for determining that there is an interference wave in the attention data when the amplitude of the attention data is large as a result of comparison, and attention data when the interference wave is present The first disturbing signal removing means that does not change the attention data when the interference wave is not present, and the attention data immediately after the pulse compression. Using a total of n2 data composed of one or more reference data connected before and after the data of interest, and a second rearranging means for sorting the n2 data according to amplitude, and the m2nd of the rearranged result As a result of comparison, the second threshold value calculation means that uses a product obtained by multiplying the data by the constant p2 as a threshold value q2, and the second amplitude comparison means that compares the threshold value q2 with the amplitude of the attention data, the amplitude of the attention data is large. Second interference signal presence / absence determining means for determining that there is a secondary interference wave in the target data, and processing for replacing the target data with zero when the secondary interference signal is present, It is assumed that the interference signal removal method includes second interference signal removal means that does not modify the data of interest when it does not exist.
さらに前記第一妨害信号除去装置は常数ｐ１を随時変更できる第一常数設定手段を有し、該ｐ１の修正により第一妨害波有無判定手段の結果を調整でき、特にｐ１を設定可能な最大値に修正することにより、第一妨害波除去手段の動作を停止させることも可能である事を特徴とする妨害信号除去方式であるとする。 Further, the first interference signal removing device has a first constant setting means capable of changing the constant p1 at any time, and the result of the first interference wave presence / absence determination means can be adjusted by correcting the p1, and in particular, a maximum value that can set p1 It is assumed that the interference signal removing method is characterized in that the operation of the first interference wave removing means can be stopped by modifying the above.
さらに前記第二妨害信号除去装置は常数ｐ２を随時変更できる第二常数設定手段を有し、該ｐ２の修正により第二妨害波有無判定手段の結果を調整でき、特にｐ２を設定可能な最大値に修正することにより、第二妨害波除去手段の動作を停止させることも可能である事を特徴とする妨害信号除去方式であるとする。
Further, the second interference signal removing device has a second constant setting means that can change the constant p2 at any time, and the result of the second interference wave presence / absence determination means can be adjusted by correcting the p2, especially the maximum value that can set p2. It is assumed that the interference signal removing method is characterized in that the operation of the second interference wave removing means can be stopped by modifying the above.
本発明により、パルス圧縮レーダにおいても、特別なアナログ回路等を設置することなく妨害信号を除去することが可能となる。つまり、妨害信号の除去後も位相信号が残っているため、妨害信号を除去した後においても位相情報を用いた信号処理を実行することが可能となる。
According to the present invention, even in a pulse compression radar, it is possible to remove an interference signal without installing a special analog circuit or the like. That is, since the phase signal remains even after the interference signal is removed, signal processing using the phase information can be executed even after the interference signal is removed.
本発明の最良の実施形態を図を参照しながら説明する。本発明はパルス圧縮レーダのための妨害信号除去方式であり、従来の方法とは異なり、位相情報をもった信号を取り扱う。具体的には、受信された信号は直交検波され、互いに９０度位相が異なるＩ信号とＱ信号に分離される。これらの信号は、Ｉ信号を実部、Ｑ信号を虚部とする複素信号の形で取り扱われる。本発明では、そのようにして得られた複素信号を用いて妨害信号を除去する。 The best embodiment of the present invention will be described with reference to the drawings. The present invention is an interference signal removal method for pulse compression radar, and handles a signal having phase information, unlike a conventional method. Specifically, the received signal is quadrature-detected and separated into an I signal and a Q signal that are 90 degrees out of phase with each other. These signals are handled in the form of complex signals in which the I signal is a real part and the Q signal is an imaginary part. In the present invention, the interference signal is removed using the complex signal thus obtained.
本発明による妨害波除去手段は図２に示すような２度の妨害信号除去手段を使用する２段構成になっており、妨害信号除去１において圧縮前の信号から妨害信号を除去し、この除去の影響によりパルス圧縮２０７において生成される二次的妨害信号を妨害信号除去２において除去するというものである。 The interference wave removing means according to the present invention has a two-stage configuration using two interference signal removing means as shown in FIG. 2. In the interference signal removal 1, the interference signal is removed from the signal before compression, and this removal is performed. The secondary interference signal generated in the pulse compression 207 due to the influence of the interference is removed in the interference signal removal 2.
ここで、妨害信号除去２への入力データにおいて、妨害信号除去１における注目データ１と参照データのタイミングと同様に、パルス圧縮２０７の最新の出力を注目データとする場合のみならず、メモリに格納された圧縮済みデータの中に注目データを設定する場合もあり、その方が有効であるため、図において注目データ２を圧縮済みデータの中に設定している。出力データ２１５は注目データ２に対する妨害除去結果の出力である。 Here, in the input data to the interference signal removal 2, not only when the latest output of the pulse compression 207 is the attention data, but also in the memory, as in the timing of the attention data 1 and the reference data in the interference signal removal 1. In some cases, attention data is set in the compressed data that has been compressed, and this is more effective, so attention data 2 is set in the compressed data in the figure. The output data 215 is an output of the interference removal result for the attention data 2.
また、妨害信号除去１と妨害信号除去２における妨害信号の除去の度合いを係数２０５及び２１１によって制御することが可能である。係数によっては妨害信号除去１もしくは妨害信号除去２の動作を無効化することが可能である。 Further, the degree of interference signal removal in the interference signal removal 1 and the interference signal removal 2 can be controlled by the coefficients 205 and 211. Depending on the coefficient, the operation of interference signal removal 1 or interference signal removal 2 can be invalidated.
妨害信号除去１または妨害信号除去２の具体的な内部構成を図３に示す。なお、妨害信号除去１と妨害信号除去２は同様の構成によって実現されている。図において矢尻が２重になっている信号は複素信号を表す。 A specific internal configuration of the interference signal removal 1 or the interference signal removal 2 is shown in FIG. The interference signal removal 1 and the interference signal removal 2 are realized by the same configuration. In the figure, a signal with double arrowheads represents a complex signal.
本発明では妨害信号除去に入力される各掃引データは、直交検波された複素信号である。図３では図１と同様に、掃引ｎが注目データであり、他の掃引は参照データである。入力された掃引データは、絶対値演算回路３０１によって絶対値が計算される。ここで絶対値とは、複素信号の実部の二乗と虚部の二乗の和の平方根である。 In the present invention, each sweep data input for interference signal removal is a complex signal subjected to quadrature detection. In FIG. 3, as in FIG. 1, sweep n is the data of interest, and the other sweeps are reference data. The absolute value of the input sweep data is calculated by the absolute value calculation circuit 301. Here, the absolute value is the square root of the sum of the square of the real part and the square of the imaginary part of the complex signal.
計算された絶対値はソート回路３０３によって小さい順あるいは大きい順に並べ替えられ、データセレクタ３０５によって任意に決められた規定番目のデータが取り出される。ここで、図のような参照データ及び注目データの絶対値をソート回路３０３に入力する方法のみならず、該振幅をそのまま入力する実施形態であってもかまわない。 The calculated absolute values are rearranged in ascending or descending order by the sort circuit 303, and the prescribed number of data arbitrarily determined by the data selector 305 is taken out. Here, not only the method of inputting the absolute values of the reference data and the data of interest as shown in the figure to the sort circuit 303, but also an embodiment in which the amplitude is input as it is.
データセレクタ３０５が取り出したデータは、あらかじめ、もしくは随時設定する係数３０７を乗算し、その積を妨害判定の閾値とする。ここで係数３０７は妨害信号除去の度合いを制御するための値であり、大きな値を設定すると妨害信号除去の度合いが弱くなり、係数を小さくすると妨害信号除去が過剰にはたらく。 The data extracted by the data selector 305 is multiplied by a coefficient 307 set in advance or at any time, and the product is used as a threshold value for disturbance determination. Here, the coefficient 307 is a value for controlling the degree of interference signal removal. When a large value is set, the degree of interference signal removal is weakened, and when the coefficient is reduced, interference signal removal is excessive.
特に「無限大」を意味する設定、つまり、扱うことができる最大値などを設定すれば、妨害信号除去の動作をしない場合と同様の結果を得ることが出来、事実上、妨害信号除去を無効化できる。 In particular, if you set a setting that means “infinity”, that is, a maximum value that can be handled, you can obtain the same result as when you do not remove the interference signal, and effectively disable the interference signal removal. Can be
妨害波の有り無しといった判定は、注目データの絶対値と上記のように算出された閾値の比較結果によって判定部３０９でなされる。判定部３０９は、注目データの絶対値ａが閾値Ｔよりも大きい場合には「妨害有り」と判定をし、注目データを複素数のゼロに置き換える。また、注目データの絶対値ａが閾値Ｔよりも小さい場合にはデータをゼロに置き換えることはせず、そのままの形で出力する。この方式ではデータの置き換えをした場所の位相情報は変わってしまうが、妨害が存在しない場所においては位相情報は保持されているので、パルス圧縮をしても問題はない。 The determination of whether or not there is an interference wave is made by the determination unit 309 based on the comparison result between the absolute value of the data of interest and the threshold value calculated as described above. When the absolute value a of the attention data is larger than the threshold value T, the determination unit 309 determines that “there is interference” and replaces the attention data with a complex number of zero. If the absolute value a of the data of interest is smaller than the threshold value T, the data is not replaced with zero and is output as it is. In this method, the phase information at the place where the data is replaced is changed, but the phase information is held at a place where there is no interference, so there is no problem even if pulse compression is performed.
ところが、前記のように妨害波が有ると判定を下し、注目データをゼロに置き換えるという処理をした場合、不都合が発生する場合がある。つまり、レーダーに映るべき物標信号に妨害信号が重畳している場合に、このようなデータ置き換えを施すと、パルス圧縮した際に他の信号にもデータ置き換えの影響が拡がることがある。これを二次的妨害信号と呼ぶ。 However, when it is determined that there is an interfering wave as described above and processing is performed to replace the data of interest with zero, inconvenience may occur. In other words, when the interference signal is superimposed on the target signal to be displayed on the radar, if such data replacement is performed, the influence of the data replacement may be spread to other signals when pulse compression is performed. This is called a secondary interference signal.
パルス圧縮による二次的妨害信号の生成について、図４を参照して説明する。図４は物標信号と妨害信号が独立に存在している場合の例である。物標信号は基準信号との相関演算を施され、パルス圧縮により同図のように圧縮されるが、妨害信号は当該レーダ装置の基準信号と相関が無いため、圧縮されることは無く、圧縮前の物標信号の幅まで引き伸ばされてしまう。 Generation of a secondary interference signal by pulse compression will be described with reference to FIG. FIG. 4 shows an example in which the target signal and the interference signal exist independently. The target signal is subjected to correlation calculation with the reference signal and compressed by pulse compression as shown in the figure, but the interference signal is not compressed because it has no correlation with the reference signal of the radar device, and compression is performed. It will be stretched to the width of the previous target signal.
次に、物標信号に妨害信号が重畳した場合について、図５を参照して説明する。前記のように、妨害波があると判定された注目データは強制的にゼロに置き換えることになるため、図５に示すように物標信号と妨害波が重なっている場合に物標信号を欠損させることになる。図４に基づいて考えると、正常な物標信号は正確にパルス圧縮されるが、データ欠損箇所については基準信号との相関が取れずに、送信パルス幅にまで引き伸ばされた信号となってしまう。これを二次的妨害信号とよぶ。このことにより、物標信号と妨害波が重なっている信号について妨害波除去処理を行うと、図５のように、圧縮パルスに二次的妨害信号が重畳した結果となる。 Next, a case where an interference signal is superimposed on a target signal will be described with reference to FIG. As described above, the target data determined to have an interfering wave is forcibly replaced with zero, so that the target signal is lost when the target signal and the interfering wave overlap as shown in FIG. I will let you. Considering based on FIG. 4, a normal target signal is accurately pulse-compressed, but the data missing portion cannot be correlated with the reference signal and becomes a signal stretched to the transmission pulse width. . This is called a secondary interference signal. As a result, when the interference wave removal process is performed on the signal in which the target signal and the interference wave overlap, as shown in FIG. 5, the secondary interference signal is superimposed on the compressed pulse.
前記二次的妨害信号も、既に述べた妨害信号除去の方法を用いて、同様に除去することができる。従って、図２に示すように、妨害除去手段をパルス圧縮の前後に計２個挿入することによって、物標信号のデータ欠損による二次的妨害信号をも除去することが可能となる。ただし妨害信号除去２０３と２１３は全く同じ構成である必要はなく、例えば参照データの数が異なっていてもかまわない。 The secondary interference signal can be similarly removed using the interference signal elimination method described above. Therefore, as shown in FIG. 2, by inserting a total of two interference removal means before and after the pulse compression, it is possible to remove secondary interference signals due to data loss of the target signal. However, the interference signal removals 203 and 213 need not have exactly the same configuration, and for example, the number of reference data may be different.
次に、妨害信号除去の度合いを決める係数２０５、２１１を用いて、妨害信号除去１あるいは妨害信号除去２のどちらか一方、または両方を無効にする方法も可能である。というのも、通常の使用においては、第１段目の妨害信号除去をせずとも、妨害信号除去２のみだけで充分に妨害信号除去が可能である場合も多いからである。 Next, a method of invalidating one or both of the interference signal removal 1 and the interference signal removal 2 using the coefficients 205 and 211 that determine the degree of the interference signal removal is also possible. This is because, in normal use, it is often possible to remove the interference signal sufficiently only by the interference signal removal 2 without removing the interference signal in the first stage.
妨害信号除去１が有用である場合について図６を参照して説明する。妨害信号除去１が必要なのは、主に、周囲に妨害信号源が多く存在する場合である。例えば船舶レーダの場合であれば、多くの船舶が停留する主要な港付近においては妨害信号除去１が必要である。図６はこのように、妨害信号源が多い場合の受信信号をあらわしている。 A case where the interference signal removal 1 is useful will be described with reference to FIG. The jamming signal removal 1 is necessary mainly when there are many jamming signal sources around. For example, in the case of ship radar, the interference signal removal 1 is necessary in the vicinity of a main port where many ships stop. FIG. 6 shows the received signal when there are many interference signal sources.
図６において、妨害信号は６０１のようにレンジ方向に短いインパルス状のパターンで観測されているとする。この信号をパルス圧縮すると、６０３のようにレーダの送信パルス幅程度まで妨害信号が引き伸ばされ、点在していた妨害信号が複数の掃引データについて、同一レンジで連続して観測されるようになる。本発明では、注目データの前後の掃引データを参照して妨害信号の判定を行うため、６０１のように妨害信号が連続してあらわれる場合には、妨害信号の有無の判定が困難になる。従って、妨害信号が多い場合には、６０３のように妨害信号が引き伸ばされる前に妨害信号除去を行った方がより効果的である。つまり、この場合は妨害信号除去１を動作させておいた方が良い。 In FIG. 6, it is assumed that the interfering signal is observed as an impulse pattern that is short in the range direction as indicated by 601. When this signal is pulse-compressed, the interference signal is extended to about the transmission pulse width of the radar as indicated by 603, and the scattered interference signal is continuously observed in the same range for a plurality of sweep data. . In the present invention, since the interference signal is determined with reference to the sweep data before and after the data of interest, it is difficult to determine the presence or absence of the interference signal when the interference signal appears continuously as in 601. Therefore, when there are many jamming signals, it is more effective to perform jamming signal removal before the jamming signal is stretched as in 603. That is, in this case, it is better to operate the interference signal removal 1.
次に図７及び図８を参照して、別の実施形態を説明する。図７はパルス圧縮した複素信号をさらに掃引間で複素加算つまり積分することによって、信号対雑音比を改善する手法の位相制御が可能なレーダ装置に、本発明の妨害信号除去１及び妨害信号除去２を適用した例である。７０１において積分処理を施すことから、パルス圧縮後にあっては、全てが注目データであり、かつ、参照データであることになる。 Next, another embodiment will be described with reference to FIGS. FIG. 7 shows a radar apparatus capable of phase control of a technique for improving the signal-to-noise ratio by performing complex addition, that is, integrating, a pulse-compressed complex signal between sweeps. 2 is applied. Since integration processing is performed in 701, after pulse compression, all data is attention data and reference data.
図８は図７における妨害信号除去２の内部の構成である。読み出した掃引データ８個全てが注目データであり、かつ、参照データである。８個のデータの絶対値を計算し、ソート後、データセレクタで選択した値に係数を乗じて閾値を得るのは前述と同様であるが、この例では、読み出したデータ全てが注目データであるので、閾値判定をすべてのデータに対して実行し、結果としての複素数を出力する。図中において、Ｔ、ａ、ｘ、ｙはａ＜Ｔならば複素信号ｙ＝ｘを出力し、それ以外においてはｙ＝０を出力する。 FIG. 8 shows the internal configuration of the interference signal removal 2 in FIG. All eight pieces of read sweep data are notable data and reference data. The absolute values of the eight data are calculated, and after sorting, the threshold value is obtained by multiplying the value selected by the data selector by the coefficient, as in the previous example. In this example, all the read data is the data of interest. Therefore, threshold determination is executed for all data, and the resulting complex number is output. In the figure, T, a, x, and y output a complex signal y = x if a <T, and y = 0 otherwise.
本発明の前述した内容について、フローチャートを図９に示す。
A flowchart of the above-described contents of the present invention is shown in FIG.
１０１…注目データ、 １０３…ソート回路、 １０５…データセレクタ、
２０１…注目データ１、 ２０３…妨害信号除去１、 ２０５…係数１、
２０７…パルス圧縮装置、 ２０９…圧縮済み参照データ、
２１１…係数２、 ２１２…注目データ２、
２１３…妨害信号除去２、 ２１５…出力データ、
３０１…絶対値演算器、 ３０３…ソート回路、 ３０５…データセレクタ、
３０７…係数、 ３０９…妨害信号有無判定装置、
６０１…パルス圧縮前、 ６０３…パルス圧縮後、
７０１…複素加算器
101 ... attention data, 103 ... sort circuit, 105 ... data selector,
201: attention data 1, 203 ... interference signal removal 1, 205 ... coefficient 1,
207 ... pulse compression device, 209 ... compressed reference data,
211: coefficient 2, 212: attention data 2,
213 ... Interference signal removal 2, 215 ... Output data,
301: Absolute value calculator, 303 ... Sort circuit, 305 ... Data selector,
307 ... coefficient, 309 ... interference signal presence / absence determination device,
601 ... before pulse compression, 603 ... after pulse compression,
701: Complex adder
Claims (3)
パルス圧縮直前における受信データ列における注目データと、該注目データの前後に連なる１個以上の参照データからなる合計ｎ１個のデータを用い、
該ｎ１個のデータを振幅によりソートする第一並べ替え手段と、
並べ替えた結果のｍ１番目のデータに常数ｐ１を乗じた積を閾値ｑ１とする第一閾値算出手段と、
該閾値ｑ１と前記注目データの振幅を比較する第一振幅比較手段と、
比較した結果として注目データの振幅が大きかった場合に注目データに妨害波が存在すると判定する第一妨害波有無判定手段と、
妨害波が存在する場合に注目データをゼロに置き換える処理を行い又妨害波が存在しない場合には注目データに手を加えない第一妨害信号除去手段と、
パルス圧縮直後における注目データと、該注目データの前後に連なる１個以上の参照データからなる合計ｎ２個のデータを用い、
該ｎ２個のデータを振幅によりソートする第二並べ替え手段と、
並べ替えた結果のｍ２番目のデータに常数ｐ２を乗じた積を閾値ｑ２とする第二閾値算出手段と、
該閾値ｑ２と前記注目データの振幅を比較する第二振幅比較手段と、
比較した結果として注目データの振幅が大きかった場合に注目データに二次的妨害波が存在すると判定する第二妨害波有無判定手段と、
二次的妨害波が存在する場合に注目データをゼロに置き換える処理を行い又二次的妨害波が存在しない場合には注目データに手を加えない第二妨害信号除去手段と、
からなる妨害信号除去方式。
In radar equipment using the pulse compression method,
Using a total of n1 data composed of attention data in the received data string immediately before pulse compression and one or more reference data connected before and after the attention data,
First rearranging means for sorting the n1 data by amplitude;
A first threshold value calculation means for setting a threshold value q1 to a product obtained by multiplying the m1th data of the rearranged result by a constant p1;
First amplitude comparison means for comparing the threshold value q1 and the amplitude of the data of interest;
As a result of comparison, when the amplitude of the data of interest is large, first interference wave presence / absence determining means for determining that there is an interference wave in the data of interest;
A first disturbing signal removing means for performing processing to replace the attention data with zero when the interference wave is present, and not modifying the attention data when the interference wave is not present;
Using a total of n2 data consisting of attention data immediately after pulse compression and one or more reference data connected before and after the attention data,
A second rearranging means for sorting the n2 data by amplitude;
A second threshold value calculation means for setting a threshold value q2 to a product obtained by multiplying the m2nd data of the rearranged result by a constant p2;
Second amplitude comparison means for comparing the threshold value q2 with the amplitude of the data of interest;
As a result of comparison, when the amplitude of the data of interest is large, second interference wave presence / absence determining means for determining that the secondary interference wave exists in the data of interest;
A second jamming signal removing means for performing processing to replace the data of interest with zero when there is a secondary jamming wave, and not handling the data of interest when there is no secondary jamming wave;
Interference signal elimination method consisting of
The first interfering signal removing device has a first constant setting means capable of changing the constant p1 at any time, and the result of the first interfering wave presence / absence determining means can be adjusted by correcting the p1, and in particular, p1 can be set to a maximum value. The interference signal removal system according to claim 1, wherein the operation of the first interference wave removal means can be stopped by modification.
The second interference signal removing device has a second constant setting means that can change the constant p2 at any time, and can adjust the result of the second interference wave presence / absence determination means by correcting the p2, and in particular, p2 can be set to a maximum value that can be set. The interference signal removal method according to claim 1, wherein the operation of the second interference wave removal means can be stopped by modification.
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