JPH02226087A - Transmitter/receiver - Google Patents
Transmitter/receiverInfo
- Publication number
- JPH02226087A JPH02226087A JP4618189A JP4618189A JPH02226087A JP H02226087 A JPH02226087 A JP H02226087A JP 4618189 A JP4618189 A JP 4618189A JP 4618189 A JP4618189 A JP 4618189A JP H02226087 A JPH02226087 A JP H02226087A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- transmitter
- output
- pulse
- interrogation signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 238000000411 transmission spectrum Methods 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
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Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ＤＭＥ （Ｄｉｓｔ！ｎｃｅ Ｍｅｉｓｕｒ
ｆｎｇ Ｅｑｕｉ−ｐｍｃｎｔ）として知られている距
離測定装置の地上装置（トランスポンダ）における送受
信装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to DME (Dist!nce Meisur
It concerns a transmitting and receiving device in a ground device (transponder) of a distance measuring device known as fng equi-pmcnt.
（従来の技術）
周知のように、ＤＭＥは、航空援助施設として運用され
ているもので、機上装置たるインタロゲータと地上装置
たるトランスポンダとから構成され、航空機にそのＤＭ
Ｅ地上局からの距離情報を提供するシステムである。こ
のＤＭＥシステムでの距離測定方式は、例えば刊行物［
航空電子装置（岡田實絹、日刊工業新聞社発行）Ｊ等に
詳記されているが、概路次の通りである。即ち、トラン
スポンダはインタロゲータからの質問信号に対し応答信
号を返送するようになっており、インタロゲータは質問
信号を発してから応答信号を受信するまでの時間から距
離を求めるようになっている。(Prior Art) As is well known, the DME is operated as an air support facility, and is composed of an interrogator as an on-board device and a transponder as a ground device, and is used to transmit its DM to an aircraft.
This is a system that provides distance information from the E ground station. The distance measurement method in this DME system is described, for example, in the publication [
It is described in detail in Avionics Equipment (by Minoru Okada, published by Nikkan Kogyo Shimbun) J, etc., but the outline is as follows. That is, the transponder is designed to return a response signal to the interrogation signal from the interrogator, and the interrogator calculates the distance from the time from when it issues the interrogation signal to when it receives the response signal.
そして、周知のように、ＤＭＥシステムの仕様はＩＣＡ
Ｏ（国際民間航空機ｉ）で定められるが、所定のパルス
間隔を有する対パルスからなる質問信号と応答信号のパ
ルス波形仕様は第３図に示す通りであって、所定の送信
スペクトルを維持するためにガウシャン波形が採用され
、所定の覆域（２００海里）を確保するために質問信号
および応答信号は数に胃以上の所定電力で送信するよう
に定められている。なお、対パルスのパルス間’ｆｉｎ
ｔ ｒはチャネルによって異なる値となっている。And, as is well known, the specifications of the DME system are ICA
O (International Civil Aircraft i), the pulse waveform specifications of the interrogation signal and response signal, which consist of paired pulses with a predetermined pulse interval, are as shown in Figure 3, and in order to maintain the predetermined transmission spectrum. A Gaussian waveform is adopted, and in order to secure a predetermined coverage area (200 nautical miles), it is determined that the interrogation signal and response signal are transmitted with a predetermined power that is more than enough power. In addition, 'fin' between the pulses of the paired pulses
tr has a different value depending on the channel.
（発明が解決しようとする課題）
ところで、航空機は空港領域では航空路よりも高い精度
の距離情報を必要とする。ところが、高精度化を図るた
めにパルスの立ち上りを鋭くすると、信号のスペクトラ
ムが広がるので、所定の送信スペクトラムを維持するた
めには、その分送信出力を低減せざるを得す、その結果
覆域が狭くなり、航空路用としての覆域（２００海里）
を確保できなくなる。(Problem to be Solved by the Invention) Incidentally, aircraft require more accurate distance information in the airport area than in the air route. However, if the rise of the pulse is made sharper in order to achieve higher precision, the signal spectrum will widen, so in order to maintain the specified transmission spectrum, the transmission output must be reduced by that amount, resulting in a reduction in coverage. becomes narrower, and the area covered for air routes (200 nautical miles)
It becomes impossible to secure
そこで、航空援助施設として用いられている従来のＤＭ
Ｅは、広い覆域を必要とする航空路用と覆域は狭いが高
精度測距を目的とする空港領域用とで構成するようにし
ている。その結果、相互干渉を避けるために遠距離測定
用のチャネルと近距離の高精度測定用のチャネルとを各
別に設ける必要があり、周波数の有効利用が図れない、
また、同種装置が別体として存在するので、システム構
成が複雑化し、またコストアップの要因となる、等の問
題がある。Therefore, the conventional DM used as an air support facility
E is configured to have two types: one for air routes, which requires a wide coverage area, and one for airport areas, which has a narrow coverage area but is intended for high-precision ranging. As a result, in order to avoid mutual interference, it is necessary to provide separate channels for long-distance measurement and short-distance high-precision measurement, making it impossible to use frequencies effectively.
Further, since the same type of devices exist separately, there are problems such as the system configuration becomes complicated and the cost increases.
なお、高精度測距を目的とするＤＭＥでは、第４図に示
す通り、立ち上り時間が１μｓの急峻なパルスを使用し
、航空路におけるよりも１０倍以上の高精度を得ている
。ここに、対パルスのパルス間隔ｔ２はチャネルによっ
て異なり、また航空路用ＤＭＨのものとも異なる。As shown in FIG. 4, DME aimed at high-precision distance measurement uses steep pulses with a rise time of 1 μs, achieving accuracy more than 10 times higher than in air routes. Here, the pulse interval t2 of the paired pulses differs depending on the channel, and also differs from that of the airway DMH.
本発明は、このような従来の問題に鑑みなされたもので
、その目的は、１台の装置で広い覆域の確保を可能にす
るとともに、空港領域において高精度の測距を可能にす
る送受信装置を提供することにある。The present invention was developed in view of these conventional problems, and its purpose is to enable a wide coverage area with a single device, and to transmit and receive signals that enable high-precision distance measurement in airport areas. The goal is to provide equipment.
（課題を解決するための手段）
前記目的を達成するために、本発明の送受信装置は次の
如き構成を有する。(Means for Solving the Problems) In order to achieve the above object, a transmitting/receiving device of the present invention has the following configuration.
即ち、本発明の送受信装置は、パルス間隔およびパルス
立ち上り時間が異なる２つの対パルスのいずれか一方の
質問信号を測距目的に応じて選択送信するインタロゲー
タからの質問信号を受信しその質問信号に対応した応答
信号を送信するトランスポンダにおける送受信装置であ
って； この送受信装置は、受信した質問信号のパルス
間隔を示す解読信号を出力する受信機と； パルス間隔
およびパルス立ち上り時間が異なる２つの対パルスのい
ずれか一方を前記解読信号の内容に応じて形成出力する
変調器と； 前記変調器の出力信号を所定レベルに増幅
等して無線送信すべき応答信号を形成出力する第１の送
信機と； 入力信号である前記第１の送信機の出力信号
を、前記解読信号の内容がパルス立ち上り時間の短い方
のパルスｒｓｍであるとき第１の出力端へ送出し、パル
ス立ち上り時間の長い方のパルス間隔であるとき第２の
出力端へ送出する第１の切換器と； 前記第２の出力端
へ送出された信号を所定レベルに増幅等して無線送信す
べき応答信号を形成出力する第２の送信機と； 前記解
読信号の内容がパルス立ち上り時間の短い方のパルス間
隔であるときは前記第１の出力端へ送出された信号を無
線送信させ、パルス立ち上り時間の長い方のパルス間隔
であるときは前記第２の送信機の出力信号を無線送信さ
せる第２の切換器と： を備えていることを特徴とする
ものである。That is, the transmitting/receiving device of the present invention receives an interrogation signal from an interrogator that selectively transmits an interrogation signal of one of two paired pulses with different pulse intervals and pulse rise times depending on the purpose of distance measurement, and transmits an interrogation signal to the interrogation signal. A transmitting/receiving device in a transponder for transmitting a corresponding response signal; the transmitting/receiving device comprising: a receiver for outputting a decoding signal indicating the pulse interval of a received interrogation signal; and two paired pulses having different pulse intervals and pulse rise times. a modulator that forms and outputs one of the following depending on the content of the decoded signal; a first transmitter that amplifies the output signal of the modulator to a predetermined level and forms and outputs a response signal to be wirelessly transmitted; ; Sending the output signal of the first transmitter, which is an input signal, to the first output terminal when the content of the decoding signal is a pulse rsm with a shorter pulse rise time; a first switch that sends the signal to the second output terminal when the signal is at the pulse interval; a second switch that amplifies the signal sent to the second output terminal to a predetermined level and forms and outputs a response signal to be wirelessly transmitted. a second transmitter; when the content of the decoded signal is a pulse interval with a shorter pulse rise time, the signal sent to the first output terminal is wirelessly transmitted; and a second switch for wirelessly transmitting the output signal of the second transmitter.
（作 用）
次に、前記の如く構成される本発明の送受信装置の作用
を説明する。(Function) Next, the function of the transmitter/receiver of the present invention configured as described above will be explained.
本発明に係るインタロゲータは、測距の目的に応じて、
即ち航空機が航空路にあって遠路１１８１１定を行う場
合、あるいは、空港領域にあって高精度の距離測定を行
う場合に応じて第３図あるいは第４図に示す波形の質問
信号を発するようになっている。The interrogator according to the present invention has the following features depending on the purpose of distance measurement:
That is, when the aircraft is on an air route and is performing a long distance 11811 determination, or when it is in an airport area and performing high-precision distance measurement, an interrogation signal having the waveform shown in FIG. 3 or 4 is emitted. It has become.
そこで、送受信装置では、受信した質問信号のパルス幅
を検出し、そのパルス幅（１＋またはｔｚ）に対応した
パルス幅（ｔｘまたはｔｚ）の対パルスを形成し、それ
を所定レベルに増幅等して無線送信すべき応答信号を形
成（第１の送信機）する、そして、質問信号のパルス幅
がｔｌであるときは、第１の送信機の出力を更に第２の
送信機で所定レベルまで増幅等して無線送信する。つま
り、送信電力を大きくして広い覆域をカバーするのであ
る。また、質問信号のパルス幅がｔ２であるときは、第
１の送信機の出力をそのまま応答信号として無線送信す
る。つまり、送信電力を小さくして高精度測定時の送信
スペクトラム特性を満足するようにするのである。Therefore, the transmitter/receiver detects the pulse width of the received interrogation signal, forms a pair of pulses with a pulse width (tx or tz) corresponding to the pulse width (1+ or tz), and amplifies it to a predetermined level. to form a response signal to be wirelessly transmitted (first transmitter), and when the pulse width of the interrogation signal is tl, the output of the first transmitter is further increased to a predetermined level by the second transmitter. It is amplified and transmitted wirelessly. In other words, the transmission power is increased to cover a wide area. Furthermore, when the pulse width of the interrogation signal is t2, the output of the first transmitter is directly transmitted wirelessly as a response signal. In other words, the transmission power is reduced to satisfy the transmission spectrum characteristics during high-precision measurement.
斯くして、パ本発明の送受信装置によれば、１台の装置
で広い覆域の確保と近距離における高精度の測距とが可
能となる。Thus, according to the transmitting/receiving device of the present invention, it is possible to secure a wide coverage area and perform highly accurate distance measurement at short distances with one device.
く実 施 例） 以下、本発明の実施例を図面を参照して説明する。Practical example) Embodiments of the present invention will be described below with reference to the drawings.
第１区は本発明の一実施例に係る送受信装置を示す０本
発明のインクロゲータく図示せず）は、航空機が航空路
にあるときは第３図に示す如き波形の質問信号を送信し
、また空港領域にあって高精度測距を必要とする場合に
は第４図に示す波形の質問信号を送信するようになって
いる。これは、チャネルを変更せず同一のチャネルを用
いて行われる。The first section shows a transmitting/receiving device according to an embodiment of the present invention.The interrogator (not shown) of the present invention transmits an interrogation signal with a waveform as shown in FIG. 3 when the aircraft is on the air route. In addition, when high-precision distance measurement is required in an airport area, an interrogation signal having a waveform shown in FIG. 4 is transmitted. This is done using the same channel without changing channels.
つまり、第１図において、受信機１ヘサーキユレータを
介して図外の空中線から入力する質問信号■は、遠距離
測定時には第２図（Ａ）■であり、また高精度測定時に
は第２図（Ｂ）■である。In other words, in Fig. 1, the interrogation signal ■ input from an antenna (not shown) to the receiver 1 via the circulator is Fig. 2 (A) ■ during long-distance measurement, and Fig. 2 (B) during high-precision measurement. )■.
受信機１は、質問信号■を構成する対パルスを検出する
と、検出信号■〈第２図（Ａ）（Ｂ）■）を出力すると
ともに、パルス幅を計測し、パルス幅がｔｌであるとき
は解読信号■を低レベルに保持しく第２図（Ａ）■）、
パルス幅がｔ２であるときは解読信号■を第１？ｆ（Ｂ
）■に示すように所定期間１Ｓ宛高レベルに保持する。When the receiver 1 detects the pair of pulses constituting the interrogation signal ■, it outputs the detection signal ■ (Fig. 2 (A) (B) ■) and measures the pulse width, and when the pulse width is tl, The decoding signal ■ should be kept at a low level (Figure 2 (A) ■),
When the pulse width is t2, the decoding signal ■ is the first? f(B
) As shown in (2), the signal is held at the high level for 1S for a predetermined period of time.
検出信号■は変調器２へ出力される。一方、解読信号■
は変調器２と第１切換器４と第２切換器６とへ出力され
る。The detection signal ■ is output to the modulator 2. On the other hand, the deciphered signal ■
is output to the modulator 2, the first switch 4, and the second switch 6.
変調器２は、検出信号■の入力時において解読信号■が
低レベルであるときは、パルス幅がｔｌの対パルスから
なる被変調信号■（第２図（Ａ）■）を形成出力する。When the decoding signal (2) is at a low level when the detection signal (2) is input, the modulator 2 forms and outputs a modulated signal (2) consisting of a pair of pulses with a pulse width tl ((2) in FIG. 2(A)).
一方、検出信号■の入力時において解読信号■が高レベ
ルであるときは、パルス幅がｔ２の対パルスからなる被
変調信号■（第２図（Ｂ）■）を形成出力する。On the other hand, when the decoding signal (2) is at a high level when the detection signal (2) is input, a modulated signal (2) consisting of a pair of pulses with a pulse width of t2 ((2) in FIG. 2(B)) is formed and output.
第１送信機３は、被変調信号■について増幅等して所定
レベルの応答信号■（第２図（Ａ ＞（Ｂ ）■）を形
成出力する。ここに、この応答信号■は無線送信すべき
信号であって、その電力レベルは例えば＋００胃である
。The first transmitter 3 amplifies the modulated signal ■ to form and output a response signal ■ at a predetermined level (Fig. 2 (A > (B) ■). Here, this response signal ■ is transmitted wirelessly. It is an exponent signal whose power level is, for example, +00.
第１切換器４は、解読信号■が低レベルであるときは応
答信号■を遠距離用応答信号■（第２図（Ａ）■）とし
て第２送信機５へ出力する。一方、解読信号■が高レベ
ルであるときは応答信号■を高精度応答信号■（第２図
（Ｂ）■）として第２切換器６へ出力する。When the decoding signal ■ is at a low level, the first switch 4 outputs the response signal ■ to the second transmitter 5 as a long-distance response signal ■ (FIG. 2(A) ■). On the other hand, when the decoding signal ■ is at a high level, the response signal ■ is outputted to the second switch 6 as a high precision response signal ■ (FIG. 2(B) ■).
第２送信機５では、遠距離用応答信号■を所定レベル、
例えば３）ＩＮまで増幅等して無線送信すべき遠距離用
応答信号■（第２図（Ａ）■）を形成出力する。The second transmitter 5 sends the long-distance response signal ■ to a predetermined level.
For example, 3) amplify up to IN and form and output a long-distance response signal (2) (FIG. 2(A)) to be transmitted wirelessly.
第２切換器６は、解読信号■が低レベルであるときは遠
距離用応答信号■を応答信号■（第２図（Ａ）■）とし
てサーキュレータを介して図外の空中線へ伝達し無線送
信させる。送信出力は３に胃であり、十分な覆域を確保
できる。一方、解読信号■が高レベルであるときは高精
度応答信号■を応答信号■（第２図（Ｂ）■）としてサ
ーキュレータを介して図中の空中線へ伝達し無線送信さ
せる、送信出力は１００Ｎであり、規定の送信スペクト
ラムを満足させ得る。When the decoding signal ■ is at a low level, the second switching device 6 transmits the long-distance response signal ■ as a response signal ■ (Fig. 2 (A) ■) to an antenna not shown through a circulator and transmits it wirelessly. let The transmitting output is 3.5 mm, ensuring sufficient coverage. On the other hand, when the decoding signal ■ is at a high level, the high-precision response signal ■ is transmitted as a response signal ■ (Fig. 2 (B) ■) to the antenna shown in the figure via the circulator for wireless transmission.The transmission output is 100N. and can satisfy the specified transmission spectrum.
なお、第２図中のｒＴＪは測距計算に必要な遅延時閉で
ある。Note that rTJ in FIG. 2 is closed during a delay necessary for distance measurement calculation.
（発明の効果）
以上説明したように、本発明の送受信装置によれば、測
距の目的に応じた内容の質問信号を受信すると、自動的
にその質問信号の内容を解読し、質問信号の内容に応じ
た応答信号を所定の電力で送信できるようにしたので、
１台の装置で遠距離測定においては所望の広い覆域を確
保でき、また送信スペクトラムの規定を満足した状態で
近距離における高精度測定を可能にするという効果があ
る。(Effects of the Invention) As explained above, according to the transmitting/receiving device of the present invention, upon receiving an interrogation signal whose content corresponds to the purpose of distance measurement, it automatically decodes the interrogation signal and decodes the interrogation signal. Since we have made it possible to transmit a response signal according to the content with a predetermined power,
One device has the effect of ensuring a desired wide coverage area in long-distance measurements, and enabling high-precision measurements at short distances while satisfying the transmission spectrum regulations.
第１図は本発明の一実施例に係る送受信装置の構成ブロ
ック図、第２図は動作波形図、第３図は遠距離測定用送
信信号波形図、第４図は高精度測定用送信信号波形図で
ある。
１・・・・・・受信機、 ２・・・・・・変調器、 ３
・・・・・・第１送信機、 ４・・・・・・第１切換器
、機、 ６・・・・・・第２切換器。Figure 1 is a configuration block diagram of a transmitter/receiver according to an embodiment of the present invention, Figure 2 is an operating waveform diagram, Figure 3 is a waveform diagram of a transmission signal for long-distance measurement, and Figure 4 is a transmission signal for high-precision measurement. FIG. 1...Receiver, 2...Modulator, 3
...First transmitter, 4...First switch, machine, 6...Second switch.
Claims (1)
パルスのいずれか一方の質問信号を測距目的に応じて選
択送信するインタロゲータからの質問信号を受信しその
質問信号に対応した応答信号を送信するトランスポンダ
における送受信装置であって；この送受信装置は、受信
した質問信号のパルス間隔を示す解読信号を出力する受
信機と；パルス間隔およびパルス立ち上り時間が異なる
２つの対パルスのいずれか一方を前記解読信号の内容に
応じて形成出力する変調器と；前記変調器の出力信号を
所定レベルに増幅等して無線送信すべき応答信号を形成
出力する第１の送信機と；入力信号である前記第１の送
信機の出力信号を、前記解読信号の内容がパルス立ち上
り時間の短い方のパルス間隔であるとき第１の出力端へ
送出し、パルス立ち上り時間の長い方のパルス間隔であ
るとき第２の出力端へ送出する第１の切換器と；前記第
２の出力端へ送出された信号を所定レベルに増幅等して
無線送信すべき応答信号を形成出力する第２の送信機と
；前記解読信号の内容がパルス立ち上り時間の短い方の
パルス間隔であるときは前記第１の出力端へ送出された
信号を無線送信させ、パルス立ち上り時間の長い方のパ
ルス間隔であるときは前記第２の送信機の出力信号を無
線送信させる第２の切換器と；を備えていることを特徴
とする送受信装置。A transponder that receives an interrogation signal from an interrogator that selects and transmits one of two paired pulses with different pulse intervals and pulse rise times depending on the purpose of distance measurement, and transmits a response signal corresponding to the interrogation signal. A transmitting/receiving device; the transmitting/receiving device includes: a receiver that outputs a decoding signal indicating a pulse interval of a received interrogation signal; and a receiver that outputs a decoding signal indicating a pulse interval of a received interrogation signal; a modulator that forms and outputs a response signal to be wirelessly transmitted by amplifying the output signal of the modulator to a predetermined level; a first transmitter that forms and outputs a response signal to be wirelessly transmitted; sending the output signal of the transmitter to a first output when the content of the decoded signal is a pulse interval with a shorter pulse rise time and to a second output when the content is a pulse interval with a longer pulse rise time; a first switching device that outputs the signal sent to the second output terminal; a second transmitter that amplifies the signal sent to the second output terminal to a predetermined level to form a response signal to be transmitted wirelessly; and a second transmitter that outputs the decoded signal. When the content of is a pulse interval with a shorter pulse rise time, the signal sent to the first output terminal is wirelessly transmitted, and when the content is a pulse interval with a longer pulse rise time, the signal is transmitted wirelessly. 1. A transmitting/receiving device comprising: a second switch for wirelessly transmitting an output signal of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1046181A JP2586130B2 (en) | 1989-02-27 | 1989-02-27 | Transceiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1046181A JP2586130B2 (en) | 1989-02-27 | 1989-02-27 | Transceiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02226087A true JPH02226087A (en) | 1990-09-07 |
| JP2586130B2 JP2586130B2 (en) | 1997-02-26 |
Family
ID=12739863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1046181A Expired - Lifetime JP2586130B2 (en) | 1989-02-27 | 1989-02-27 | Transceiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2586130B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04157390A (en) * | 1990-10-19 | 1992-05-29 | Nec Corp | Processing device of ssr signal |
| US7369082B2 (en) * | 2006-07-12 | 2008-05-06 | Enterprise Electronics Corporation | Method and apparatus implementing a scan strategy for automatic high power tube recovery |
| JP2020159980A (en) * | 2019-03-28 | 2020-10-01 | 古河電気工業株式会社 | Radar device and target detection method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS634156A (en) * | 1986-06-20 | 1988-01-09 | ナショナル住宅産業株式会社 | Concrete panel |
| JPS6326356A (en) * | 1986-07-18 | 1988-02-03 | Mitsubishi Metal Corp | Formation of film |
-
1989
- 1989-02-27 JP JP1046181A patent/JP2586130B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS634156A (en) * | 1986-06-20 | 1988-01-09 | ナショナル住宅産業株式会社 | Concrete panel |
| JPS6326356A (en) * | 1986-07-18 | 1988-02-03 | Mitsubishi Metal Corp | Formation of film |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04157390A (en) * | 1990-10-19 | 1992-05-29 | Nec Corp | Processing device of ssr signal |
| US7369082B2 (en) * | 2006-07-12 | 2008-05-06 | Enterprise Electronics Corporation | Method and apparatus implementing a scan strategy for automatic high power tube recovery |
| JP2020159980A (en) * | 2019-03-28 | 2020-10-01 | 古河電気工業株式会社 | Radar device and target detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2586130B2 (en) | 1997-02-26 |
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