JPS5654374A - Doppler detecting system of active sonar apparatus - Google Patents
Doppler detecting system of active sonar apparatusInfo
- Publication number
- JPS5654374A JPS5654374A JP13013679A JP13013679A JPS5654374A JP S5654374 A JPS5654374 A JP S5654374A JP 13013679 A JP13013679 A JP 13013679A JP 13013679 A JP13013679 A JP 13013679A JP S5654374 A JPS5654374 A JP S5654374A
- Authority
- JP
- Japan
- Prior art keywords
- doppler
- transmitter
- erasing
- circuit
- squaring
- 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
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/50—Systems of measurement, based on relative movement of the target
- G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
Abstract
PURPOSE:To decrease the own Doppler erasing errors without decreasing target searching areas by squaring the transmitter-receiver output signals at the erasing of the own Doppler. CONSTITUTION:Switches 4 and 14 are so controlled by a timing circuit 15 that they are connected to the contacts 41 and 141 side only at the own Doppler erasing and are connected to the contacts 42 and 142 side in other time. First, a transmitter 16 is operated by the trigger pulse from a timing circuit 15 and acoustic pulses are transmitted into water through a transmitter-receiver 1. The reflection signals obtained within a fixed period after the transmission are squared by a squaring circuit 2 and are applied to a sample holding circuit 8 and an amplitude comparator 17 via a high-pass filter 3, a mixer 5, a band-pass filter 6, and a frequency discriminator 7. The reflection signals obtained in the period after this are applied to the mixer 5 without being passed through the squaring circuit 2. The differences in the frequencies of these reception signals are discriminated and the moving target search signal is obtained from the amplitude comparator 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13013679A JPS5654374A (en) | 1979-10-09 | 1979-10-09 | Doppler detecting system of active sonar apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13013679A JPS5654374A (en) | 1979-10-09 | 1979-10-09 | Doppler detecting system of active sonar apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5654374A true JPS5654374A (en) | 1981-05-14 |
Family
ID=15026811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13013679A Pending JPS5654374A (en) | 1979-10-09 | 1979-10-09 | Doppler detecting system of active sonar apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5654374A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61127833A (en) * | 1984-11-27 | 1986-06-16 | 日本鉱業株式会社 | Recovery of mercury in iron sulfide concentrate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5089065A (en) * | 1973-12-07 | 1975-07-17 | ||
| JPS5113589A (en) * | 1974-07-25 | 1976-02-03 | Tokyo Shibaura Electric Co |
-
1979
- 1979-10-09 JP JP13013679A patent/JPS5654374A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5089065A (en) * | 1973-12-07 | 1975-07-17 | ||
| JPS5113589A (en) * | 1974-07-25 | 1976-02-03 | Tokyo Shibaura Electric Co |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61127833A (en) * | 1984-11-27 | 1986-06-16 | 日本鉱業株式会社 | Recovery of mercury in iron sulfide concentrate |
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