JPH055313B2 - - Google Patents
Info
- Publication number
- JPH055313B2 JPH055313B2 JP61206022A JP20602286A JPH055313B2 JP H055313 B2 JPH055313 B2 JP H055313B2 JP 61206022 A JP61206022 A JP 61206022A JP 20602286 A JP20602286 A JP 20602286A JP H055313 B2 JPH055313 B2 JP H055313B2
- Authority
- JP
- Japan
- Prior art keywords
- wave
- stc
- received
- start timing
- received wave
- 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.)
- Expired - Lifetime
Links
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- Radar Systems Or Details Thereof (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、受信波のセンシテイブ・タイム・
コントロール（Sensitiv Time Control：以下
STCとする）の開始タイミングを自動制御する
衛星搭載用合成開口レーダに関するものである。[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to the sensitive time
Control (Sensitiv Time Control: below)
This relates to a satellite-mounted synthetic aperture radar that automatically controls the start timing of STC.
第３図は従来の受信機のSTC開始タイミング
の制御方式を用いた合成開口レーダの機能図で、
１はパルス信号を変調増幅して送信波を発生する
ための送信部、２は送信波と受信波を分離するた
めの送受分波部、３は送受信用アンテナ、４は受
信波を復調し、パルス信号を検波するための受信
部、５は地上にてSTC開始タイミングを計算に
よつて求め、その値をコマンドとして衛星搭載合
成開口レーダに送信するための地上局、６はその
コマンドを受信する受信部、７は６によつて受信
されたコマンドにより得られたSTC開始タイミ
ングを適用し受信波のSTC制御を行うSTC制御
部である。
Figure 3 is a functional diagram of a synthetic aperture radar using a conventional receiver STC start timing control method.
1 is a transmitter for modulating and amplifying a pulse signal to generate a transmission wave; 2 is a transmission/reception demultiplexer for separating the transmission wave and reception wave; 3 is an antenna for transmission and reception; 4 is for demodulating the reception wave; A receiving unit for detecting pulse signals; 5 is a ground station for calculating the STC start timing on the ground and transmitting the value as a command to the satellite-mounted synthetic aperture radar; 6 is for receiving the command; The receiving unit 7 is an STC control unit that applies the STC start timing obtained by the command received by 6 and performs STC control of the received wave.
次に動作について説明する。第４図は、従来の
方式をタイミングチヤートに表わしたものであ
り、８は送信波、９は地上から反射された受信
波、１０はSTC制御のゲート信号であり、ここ
で、T1が地上からコマンドで与えられる送信波
から受信波までの遅れ時間つまりSTC開始時間
であり、この値を用いて、制御開始のタイミング
がとられていた。このように、従来は地上におい
て衛星の軌道・姿勢条件等をとり込んで、あらか
じめ計算された遅れ時間をコマンドにより衛星へ
送り、合成開口レーダにおいて、その値を用い、
受信波のSTCの開始タイミングを制御していた。 Next, the operation will be explained. Figure 4 shows the conventional system as a timing chart, where 8 is the transmitted wave, 9 is the received wave reflected from the ground, and 10 is the STC control gate signal, where T 1 is the ground signal. This is the delay time from the transmitted wave to the received wave given by the command, that is, the STC start time, and this value was used to determine the timing for starting control. In this way, conventionally, the orbit and attitude conditions of the satellite are taken in on the ground, and the pre-calculated delay time is sent to the satellite by command, and the value is used in the synthetic aperture radar.
It controlled the start timing of the STC of the received wave.
従来の合成開始レーダは受信波STC制御方式
として以上のような方式を用いているので、地上
において送信波から受信波までの遅れ時間をあら
かじめ計算しなければらず、そのためには搭載さ
れている衛星の軌道条件及び姿勢条件等を厳密に
解析することが必要で、またそれらは計算による
値であるため、実際の遅れ時間に対して多少正確
さに欠ける等の問題点があつた。
Conventional synthesis initiation radars use the above-mentioned method for controlling the received wave STC, so the delay time from the transmitted wave to the received wave must be calculated in advance on the ground. It is necessary to strictly analyze the orbit conditions, attitude conditions, etc. of the system, and since these values are calculated values, there are problems such as a slight lack of accuracy with respect to the actual delay time.
この発明は上記のような問題点を解消するため
になされたもので、従来、地上で計算しなければ
ならなかつた遅れ時間、つまりSTC開始時間は、
合成開口レーダ内で自動的に求めることがきると
ともに、その値が、実際の生データであるため受
信波とSTC制御のタイミングを確実に合せるこ
とができるSTC自動制御が実現できる合成開口
レーダを得ることを目的とする。 This invention was made to solve the above problems.The delay time, that is, the STC start time, which conventionally had to be calculated on the ground,
To obtain a synthetic aperture radar that can realize STC automatic control that can be automatically determined within the synthetic aperture radar and that can reliably match the timing of the received wave and STC control because the value is actual raw data. The purpose is to
この発明に係る合成開口レーダは、衛星搭載用
合成開口レーダの受信名をSTC制御する際制御
開始時間、つまり送信パルスから受信波までの遅
れ時間を合成開口レーダ内で自動的にカウント
し、それによりSTCの開始タイミングの自動化
をはかつたものである。
The synthetic aperture radar according to the present invention automatically counts the control start time, that is, the delay time from the transmitted pulse to the received wave, within the synthetic aperture radar when performing STC control of the reception name of the satellite-mounted synthetic aperture radar. The system aims to automate the start timing of STC.
この発明における合成開口レーダは、受信波の
STCにおいて、自動的に実際の制御開始遅れ時
間を求め、それを制御開始タイミングとして適用
することにより、従来の方式に比べて、非常に容
易となるとともに、制御開始タイミングと受信波
の受信タイミングとのタイミング合せがより正確
に行われる。
The synthetic aperture radar in this invention receives received waves.
In STC, by automatically determining the actual control start delay time and applying it as the control start timing, it is much easier than the conventional method, and the control start timing and the reception timing of the received wave can be adjusted. timing is more accurate.
以下、この発明の一実施例を図について説明す
る。第１図において、１〜４は従来と同じもので
ある。１１はSTC自動制御部であつて、この制
御部１１は送信波の送信タイミングを起点として
受信波の受信開始タイミングを検出する機能１２
と、検出されたタイミングを用いて受信波の
STC開始タイミングを自動設定する機能１３と
を備えている。
An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, numerals 1 to 4 are the same as the conventional one. Reference numeral 11 denotes an STC automatic control unit, and this control unit 11 has a function 12 that detects the reception start timing of the received wave using the transmission timing of the transmitted wave as a starting point.
Then, the received wave is calculated using the detected timing.
It also has a function 13 for automatically setting the STC start timing.
STC自動制御部では、コンパレータ及びカウ
ンタを用いて、送信波から受信波までの実際の送
れ時間を測定し、その値によつてSTC開始タイ
ミングの制御を行う。 The STC automatic control unit uses a comparator and a counter to measure the actual transmission time from the transmitted wave to the received wave, and controls the STC start timing based on the measured value.
まず、受信波の電圧振幅レベルに、受信波が受
信されたことの判断基準として、ある電圧振幅レ
ベルをスレツシユホールドレベルとして設定す
る。 First, a certain voltage amplitude level is set as a threshold level for the voltage amplitude level of the received wave as a criterion for determining that the received wave has been received.
次に送信波の出力タイミングに合わせ、コンパ
レータによつて受信波の有無の検出を開始し、同
時にカウンタを動作し始める。その後、コンパレ
ータが受信波のスレツシユホルードレベルとして
設定したあるレベル以上の受信レベルを検出する
まで、カウンタは動作し続け、コンパレータの受
信波検出と同時に、停止するようになつている。 Next, in accordance with the output timing of the transmitted wave, the comparator starts detecting the presence or absence of the received wave, and at the same time starts operating the counter. Thereafter, the counter continues to operate until the comparator detects a reception level equal to or higher than a certain level set as the threshold level of the reception wave, and stops at the same time as the comparator detects the reception wave.
このように、STC自動制御部１１において、
送信波から受信波までの遅れ時間を正確に検出
し、そのタイミングを用いてSTC制御のための
STCゲート信号を発生させ、自動的に受信波の
STC制御を行うことができる。 In this way, in the STC automatic control section 11,
Accurately detect the delay time from the transmitted wave to the received wave and use that timing to control the STC.
Generates an STC gate signal and automatically detects the received wave.
STC control can be performed.
第２図は、この発明による方式を用いた場合の
タイミングチヤートを表わしたものであり、１は
従来と同じものである。１４はあるスレツシユホ
ールドレベルが設定された受信波を示し、１５は
受信波に対して設定されたあるスレツシユホール
ドレベルを示し、１６はSTC自動制御方式によ
りSTC開始タイミングが制御されたSTC制御の
ゲート信号であり、ここでT2がSTC自動制御部
の中で、コンパレータを用い受信波の有無を判定
し、それにともない受信波の遅れ時間をカウント
することにより求められたSTC開始時間である。
この値を用いて制御開始のタイミングが正確にと
られている。 FIG. 2 shows a timing chart when the system according to the present invention is used, and 1 is the same as the conventional one. 14 indicates a received wave with a certain threshold level set, 15 indicates a certain threshold level set for the received wave, and 16 indicates STC control in which the STC start timing is controlled by the STC automatic control method. Here, T 2 is the STC start time determined by determining the presence or absence of a received wave using a comparator in the STC automatic control unit and counting the delay time of the received wave accordingly. .
This value is used to accurately determine the timing for starting control.
以上のように、この発明によれば衛星搭載用合
成開口レーダにおいて、受信波のSTC開始タイ
ミングを自動的に制御できるような方式を用いた
ので、地上での計算及びコマンド送出を行わずに
済み、またハード的に実際に求められた値を用い
ての制御であるため精度の高い制御が容易に行え
るという効果がある。
As described above, according to the present invention, in the satellite-mounted synthetic aperture radar, a method is used that can automatically control the STC start timing of the received wave, so there is no need to perform calculations or send commands on the ground. Furthermore, since the control is performed using values actually obtained using hardware, there is an effect that highly accurate control can be performed easily.
第１図はこの発明の一実施例による機能図、第
２図はこの発明のSTC自動制御方式を用いた動
作状況を示すタイミングチヤート、第３図は従来
の方式による機能図、第４図は従来の方式を用い
た動作状況を示すタイミングチヤートである。
図において、１は送信部、２は送受分波部、３
は送受信用アンテナ、４は受信部、５は地上局、
６はコマンド受信部、７はSTC制御部、８は送
信波、９は受信波、１０はSTCゲート信号、１
１はSTC自動制御部、１２はSTC自動制御部に
備えられている受信波の受信タイミングを検出す
る機能、１３はSTC自動制御部に備えられてい
る、受信波のSTC開始タイミングを自動設定す
る機能、１４はあるスレツシユホールドレベルが
設定された受信波、１５は受信波に設定されたあ
るスレツシユホールドレベル、１６はSTC自動
制御部によつてタイミングを制御されたSTCゲ
ート信号である。なお図中、同一符号は同一、又
は相当部分を示す。
FIG. 1 is a functional diagram according to an embodiment of the present invention, FIG. 2 is a timing chart showing the operating status using the STC automatic control method of the present invention, FIG. 3 is a functional diagram according to the conventional method, and FIG. This is a timing chart showing the operating status using the conventional method. In the figure, 1 is a transmitting section, 2 is a transmitting/receiving demultiplexing section, and 3
is a transmitting and receiving antenna, 4 is a receiving section, 5 is a ground station,
6 is a command reception unit, 7 is an STC control unit, 8 is a transmission wave, 9 is a reception wave, 10 is an STC gate signal, 1
1 is an STC automatic control unit, 12 is a function provided in the STC automatic control unit to detect the reception timing of the received wave, and 13 is a function provided in the STC automatic control unit to automatically set the STC start timing of the received wave. 14 is a received wave to which a certain threshold level is set; 15 is a certain threshold level set to the received wave; and 16 is an STC gate signal whose timing is controlled by the STC automatic control unit. In the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
ための送信部と、送信波と受信波を分離するため
の送受部波部と、送信波を地上へ送信し、地上か
らの反射波を受信するための送受信用アンテナ
と、受信波を復調しパルス信号を検波するための
受信部と、受信波に対して設定したスレツシユホ
ールドレベルにより受信波の有無を判定し、送信
波の送信タイミングを起点として受信波の受信開
始タイミングを検出する機能及び前記の受信開始
タイミングの検出により受信波のセンシテイブ・
タイム・コントロール（Sensitiv Time
Control）の開始タイミングを自動設定する機能
を備えたセンシテイブ・タイム・コントロール自
動制御部とで構成したことを特徴とする衛星搭載
用合成開口レーダ。1 A transmitting section that modulates and amplifies the pulse signal to generate a transmitted wave, a transmitter/receiver section that separates the transmitted wave and received wave, and transmits the transmitted wave to the ground and receives the reflected wave from the ground. A transmitting/receiving antenna for transmitting signals, a receiving section for demodulating the received waves and detecting pulse signals, and a threshold level set for the received waves to determine the presence or absence of the received waves and to determine the transmission timing of the transmitted waves. The function detects the reception start timing of the received wave as a starting point, and the sensitive signal of the received wave is detected by detecting the reception start timing mentioned above.
Time Control (Sensitiv Time)
A satellite-mounted synthetic aperture radar comprising: a sensitive time control automatic control unit having a function of automatically setting the start timing of the control).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20602286A JPS6361982A (en) | 1986-09-03 | 1986-09-03 | Synthetic aperture radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20602286A JPS6361982A (en) | 1986-09-03 | 1986-09-03 | Synthetic aperture radar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6361982A JPS6361982A (en) | 1988-03-18 |
| JPH055313B2 true JPH055313B2 (en) | 1993-01-22 |
Family
ID=16516603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20602286A Granted JPS6361982A (en) | 1986-09-03 | 1986-09-03 | Synthetic aperture radar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6361982A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03130683A (en) * | 1989-10-17 | 1991-06-04 | Nec Corp | Synthetic aperture radar apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59182379A (en) * | 1983-03-31 | 1984-10-17 | Mitsubishi Electric Corp | Synthetic aperture radar |
| JPS6088378A (en) * | 1983-10-20 | 1985-05-18 | Nec Corp | Radar equipment |
| JPS617485A (en) * | 1984-06-21 | 1986-01-14 | Nec Corp | Radar apparatus |
-
1986
- 1986-09-03 JP JP20602286A patent/JPS6361982A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6361982A (en) | 1988-03-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |