JPS6061668A - Radar equipment - Google Patents
Radar equipmentInfo
- Publication number
- JPS6061668A JPS6061668A JP17067483A JP17067483A JPS6061668A JP S6061668 A JPS6061668 A JP S6061668A JP 17067483 A JP17067483 A JP 17067483A JP 17067483 A JP17067483 A JP 17067483A JP S6061668 A JPS6061668 A JP S6061668A
- Authority
- JP
- Japan
- Prior art keywords
- clutter
- signal
- band
- detector
- received
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/52—Discriminating between fixed and moving objects or between objects moving at different speeds
- G01S13/522—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves
- G01S13/524—Discriminating between fixed and moving objects or between objects moving at different speeds using transmissions of interrupted pulse modulated waves based upon the phase or frequency shift resulting from movement of objects, with reference to the transmitted signals, e.g. coherent MTi
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
この発す1ば、レーダ装置における受信エコーが、移動
目標かクラッタであるかの識別及び除去方式%式%
パルスドフラレーグ装置?第1図に示す。図1において
、ill #rJ空中線、+21 if +1’ K
m続された受信機、(3)は(2)に接続された複数個
のバンドパスフィルタ、f41 u 131の各々に接
続された検出器である。DETAILED DESCRIPTION OF THE INVENTION This is a method for identifying and removing echoes received by a radar device as moving targets or clutter.Pulsed flag device? Shown in Figure 1. In Figure 1, ill #rJ antenna, +21 if +1' K
The m-connected receiver (3) is a detector connected to each of the plurality of bandpass filters f41 u 131 connected to (2).
次に動作について説明する。第1図に示すパルストグラ
レーダ装置において、空中線(1)で受信された信号は
、受信機(2)で所要のレベルまで増幅され、所望のド
プラ帯域を満たす複数個のバンドパスフィルタ(3)に
入力される。各バンドパスフィルタの出力は検出器(4
)に入力され、各ドプラ周波数ごとに信号の有無が検出
される。Next, the operation will be explained. In the pulsed toggle radar device shown in FIG. 1, a signal received by an antenna (1) is amplified to a required level by a receiver (2), and a plurality of bandpass filters (3) satisfying a desired Doppler band are used. is input. The output of each bandpass filter is sent to a detector (4
), and the presence or absence of a signal is detected for each Doppler frequency.
以上のようなパルスドプラレーダ装htw航空機に搭載
し後方より接近する目標全検出する場合?考える。第2
図において目標は航空機に接近するため正のドプラシフ
ト(+fdt) ’i持つ。次にクラッタは空中線から
航空機の後方へのメインロープで受信きれるものは負(
−fclc) 、バックローブで受信されるものけ正(
+fdc)のドプラシフトをそれぞれ持っている。これ
らケドプラ周波数?横軸にとり衆わしたものが第3図で
ある。図に示すごとく、目標とクラッタとでは、受信信
号の周波数軸上での現われ方[11著しい違いのあるこ
とがわかる。What if the above-mentioned pulsed Doppler radar is installed on an HTW aircraft and detects all targets approaching from behind? think. Second
In the figure, the target has a positive Doppler shift (+fdt) 'i as it approaches the aircraft. Next, clutter can be received by the main rope from the antenna to the rear of the aircraft.
-fclc), the monopole received in the backlobe (
+fdc) respectively. These Kedoplar frequencies? Figure 3 shows what is plotted on the horizontal axis. As shown in the figure, there is a significant difference in the appearance of the received signal on the frequency axis [11] between the target and the clutter.
この発(7)σ以上に述べた航空機に搭がされ後方L9
接近する目標全検出するパルストグラレーダ装置におい
て、ドブ2周波数軸上の目標とクラッタの現われ方VC
着目し、簡単な付加装置による目標とクラッタの識別及
びクラッタの除去を目的としている。This departure (7) σAboard the aircraft mentioned above
In a pulsed toggle radar device that detects all approaching targets, how targets and clutter appear on the Dob2 frequency axis VC
The aim is to identify targets and clutter and remove clutter using a simple additional device.
この発明の、購成?第4図にボす。図において、(1)
〜(4)は従来のパルスドプラレーダ装置と全く向−の
ものである。ill 、 +61がこの発明におけるパ
ルスドプラレーダ装置への付加回路であり、(5)は(
3)の各バンドパスフィルタに接続されたクラッタ検出
器、(6)は(3)4及び(5)Vcl#:続された複
数個の信号遮断器である。Purchase this invention? It is shown in Figure 4. In the figure, (1)
- (4) are completely opposite to conventional pulsed Doppler radar devices. ill, +61 is an additional circuit to the pulsed Doppler radar device in this invention, and (5) is (
3) is a clutter detector connected to each bandpass filter, and (6) is a plurality of signal interrupters connected to (3) 4 and (5) Vcl#:.
第3図に示すごとく、目標からの受1H信号は、その目
標の航空機との相対速度によりドプラシフトが決捷るの
で、周波数の広がりは極めて小さい。As shown in FIG. 3, the Doppler shift of the received 1H signal from the target is determined by the relative speed with respect to the target aircraft, so the frequency spread is extremely small.
一方クラツタからの受信信号に、航空機と地表面との相
対速度VCより決着るが、地表面より航空機ケ見上ける
角度によりドプラシフトが異なるため周波数軸上での広
がりに極めて大きくなる。On the other hand, the signal received from the clutter is determined by the relative velocity VC between the aircraft and the ground surface, but since the Doppler shift differs depending on the angle at which the aircraft is viewed from the ground surface, the spread on the frequency axis becomes extremely large.
上記から第4図の(5)クラッタ検出器においてに、各
ドプラフィルタの出力分検出し受信信号の周波数軸上の
相関ケ取ることで、広範な周波数にわたり信号のある場
合はクラッタと判断している。このようにしてクラッタ
と判断された場合には、(5)より(6)の各信号遮断
器へフィルタ信号阻止のためのブランクパルスケ送り信
号全除去している。From the above, in the clutter detector (5) in Figure 4, by detecting the output of each Doppler filter and taking the correlation on the frequency axis of the received signal, if there is a signal over a wide range of frequencies, it is determined to be clutter. There is. In this way, when it is determined that clutter is present, the blank pulse sending signal for blocking the filter signal is completely removed from each of the signal breakers (5) and (6).
以上のようにこの発明によれは、従来のパルスドプラレ
ーダ装置の規模を大きくしなくとも、クラッタ除去装置
を構成できる。As described above, according to the present invention, a clutter removal device can be constructed without increasing the scale of a conventional pulsed Doppler radar device.
第1図は従来のパルスドプラレーダ装置ブロック図、第
2図は受信波の到来方向によるドプラシフトの説明図、
第3図は受信波の周波数軸上での現われ方金示す説明図
、第4図は本発明に係るレーダ装置の一実施例を示すブ
ロック図である。
図において、fil ij空中線、(2)は受信機、(
3)はバンドパスフィルタ、(4)に検出器、(51ハ
クラツタ検出器、(6)は信号遮断器である。
各図中の同一符号は同−又は相当部分ケ示す。
代理人 大岩増雄
第1図
第2図
第3図
ドブラI司り支も〔
特許庁長官殿
1.事件の表示 特願昭 58−170674号2、発
明の名称
レーダ装置
3、補正をする省
代表者片山仁へ部
4、代理人
5、補正の対象
6、補正の内容
(1)明細書をつぎのとおり訂正する。
(2)図面の第2図を別紙のとおり訂正する。
7、 添付書類の目録
(1)図面(第2図) 1通
以上Fig. 1 is a block diagram of a conventional pulsed Doppler radar device, Fig. 2 is an explanatory diagram of Doppler shift depending on the arrival direction of received waves,
FIG. 3 is an explanatory diagram showing how received waves appear on the frequency axis, and FIG. 4 is a block diagram showing an embodiment of the radar device according to the present invention. In the figure, fil ij antenna, (2) is the receiver, (
3) is a band pass filter, (4) is a detector, (51 is a vine detector, and (6) is a signal breaker. The same reference numerals in each figure indicate the same or corresponding parts. Agent: Masuo Oiwa Figure 1 Figure 2 Figure 3 Dobra I Control Branch [Dear Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 170674/1982 2 Name of the invention Radar device 3 To Hitoshi Katayama, the representative of the Ministry making the amendment Part 4 , Agent 5, Subject of amendment 6, Contents of amendment (1) The description will be corrected as follows. (2) Figure 2 of the drawings will be corrected as shown in the attached sheet. 7. List of attached documents (1) Drawings (Figure 2) 1 or more copies
Claims (1)
複数個のバンドパスフィルタと、これらバンドパスフィ
ルタ間の信号出力の相関ケとり、信号が移動目標かクラ
ッタであるか2周波数軸上での受信強度により識別する
クラッタ検出器を備えたレーダ装置。Multiple bandpass filters are used to detect the Doppler frequency of the signal received by the antenna, the correlation of the signal output between these bandpass filters is determined, and the reception on two frequency axes determines whether the signal is a moving target or clutter. A radar device equipped with a clutter detector that identifies by intensity.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17067483A JPS6061668A (en) | 1983-09-14 | 1983-09-14 | Radar equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17067483A JPS6061668A (en) | 1983-09-14 | 1983-09-14 | Radar equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6061668A true JPS6061668A (en) | 1985-04-09 |
Family
ID=15909277
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17067483A Pending JPS6061668A (en) | 1983-09-14 | 1983-09-14 | Radar equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6061668A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0194800U (en) * | 1987-12-05 | 1989-06-22 |
-
1983
- 1983-09-14 JP JP17067483A patent/JPS6061668A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0194800U (en) * | 1987-12-05 | 1989-06-22 |
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