JPS56119870A - Object discriminator - Google Patents
Object discriminatorInfo
- Publication number
- JPS56119870A JPS56119870A JP2371880A JP2371880A JPS56119870A JP S56119870 A JPS56119870 A JP S56119870A JP 2371880 A JP2371880 A JP 2371880A JP 2371880 A JP2371880 A JP 2371880A JP S56119870 A JPS56119870 A JP S56119870A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- responder
- characteristic
- memory
- clock 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.)
- 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
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
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
PURPOSE:To make it secure to discriminate a characteristic code by eliminating the influence of fluctuation of the frequency of a discriminator which uses a microwave, by reading a memory with a clock signal which synchronizes with an interrogation signal and by generating an responder signal by two frequency dividers. CONSTITUTION:Interrogator 11 generates microwave carrier signal fc, and clock signal fs to be used by responder 12 and the both are mixed and sent out. A radio wave arriving at responder 12 is partially rectified via demodulator 20 to be used as a DC power source. The remainder is supplied to frequency dividers 22 and 23 to generate signals f1 and f2 while clock signal fs is generated by frequency divider 24. Clock signal fs is supplied to read only memory 26 via counter 25. In memory 26, the signal characteristic to responder 12 is stored and according to the memory contents, switches 27 and 28 operate by turns to send out the characteristic answer signal, FSK-modulated by output signal f1 or f2, from antenna 30. This signal is supplied to signal processing part 35 of interrogator 11 to discriminate the code characteristic to the responder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2371880A JPS56119870A (en) | 1980-02-27 | 1980-02-27 | Object discriminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2371880A JPS56119870A (en) | 1980-02-27 | 1980-02-27 | Object discriminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56119870A true JPS56119870A (en) | 1981-09-19 |
Family
ID=12118103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2371880A Pending JPS56119870A (en) | 1980-02-27 | 1980-02-27 | Object discriminator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56119870A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59122980A (en) * | 1982-12-28 | 1984-07-16 | Toshiba Corp | Object discriminating apparatus |
| EP0270274A2 (en) * | 1986-12-05 | 1988-06-08 | Meridian Micro-Systems Limited | Transponder and interrogator |
| JPS6418850U (en) * | 1987-07-24 | 1989-01-30 | ||
| US4926187A (en) * | 1987-09-24 | 1990-05-15 | Fujitsu Limited | Radio-frequency identification system |
-
1980
- 1980-02-27 JP JP2371880A patent/JPS56119870A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59122980A (en) * | 1982-12-28 | 1984-07-16 | Toshiba Corp | Object discriminating apparatus |
| EP0270274A2 (en) * | 1986-12-05 | 1988-06-08 | Meridian Micro-Systems Limited | Transponder and interrogator |
| EP0270274A3 (en) * | 1986-12-05 | 1990-01-24 | Meridian Micro-Systems Limited | Transponder and interrogator |
| JPS6418850U (en) * | 1987-07-24 | 1989-01-30 | ||
| US4926187A (en) * | 1987-09-24 | 1990-05-15 | Fujitsu Limited | Radio-frequency identification system |
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