JPS6423184A - Spread spectrum distance measurement system - Google Patents
Spread spectrum distance measurement systemInfo
- Publication number
- JPS6423184A JPS6423184A JP62178542A JP17854287A JPS6423184A JP S6423184 A JPS6423184 A JP S6423184A JP 62178542 A JP62178542 A JP 62178542A JP 17854287 A JP17854287 A JP 17854287A JP S6423184 A JPS6423184 A JP S6423184A
- Authority
- JP
- Japan
- Prior art keywords
- code
- signal
- spread spectrum
- base station
- distance
- 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
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
PURPOSE:To measure a long-distance range effectively by changing the modulation code between a received and a resent radio signal by a local station. CONSTITUTION:The spread spectrum transmitter 58 of a base station 52 imposes carrier code modulation by using the codes of two kinds of pseudo noise generators which differ in code cyclic period and sends a signal. The spread spectrum receiver 74 of the local station 56 receives the code-modulated signal from the transmitter 58 through an antenna 54 and demodulates the received signal by code synchronization. A spread spectrum transmitter 76 uses synchronous timing used at the time of the demodulation as the synchronous timing of code conversion for local transmission and resends a signal from the antenna 54. This signal is received by an antenna 50 and a spread spectrum receiver 78 demodulates the signal by code synchronization. A distance measurement system 80 measures a deviation in code synchronous timing used by a base station receiver from pseudo noise contrarily to code synchronous timing used at the time of transmission from the base station, calculates the distance of the local station from the base station from the measured value, and outputs the distance as distance data.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62178542A JP2640468B2 (en) | 1987-07-17 | 1987-07-17 | Spread spectrum distance measurement method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62178542A JP2640468B2 (en) | 1987-07-17 | 1987-07-17 | Spread spectrum distance measurement method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6423184A true JPS6423184A (en) | 1989-01-25 |
JP2640468B2 JP2640468B2 (en) | 1997-08-13 |
Family
ID=16050300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62178542A Expired - Lifetime JP2640468B2 (en) | 1987-07-17 | 1987-07-17 | Spread spectrum distance measurement method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2640468B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04363687A (en) * | 1991-06-10 | 1992-12-16 | Kenwood Corp | Range finder method |
US10359503B2 (en) | 2015-02-03 | 2019-07-23 | Nec Corporation | Position estimation apparatus, position estimation system, position estimation method and recording medium for position estimation |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5735776A (en) * | 1980-08-13 | 1982-02-26 | Nec Corp | Coded pulse communication system |
JPS6044628A (en) * | 1983-07-28 | 1985-03-09 | パ−フエクシヨン・スプリング・アンド・スタンピング・コ−ポレイシヨン | Internal nut for adjusting tension of coil spring |
-
1987
- 1987-07-17 JP JP62178542A patent/JP2640468B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5735776A (en) * | 1980-08-13 | 1982-02-26 | Nec Corp | Coded pulse communication system |
JPS6044628A (en) * | 1983-07-28 | 1985-03-09 | パ−フエクシヨン・スプリング・アンド・スタンピング・コ−ポレイシヨン | Internal nut for adjusting tension of coil spring |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04363687A (en) * | 1991-06-10 | 1992-12-16 | Kenwood Corp | Range finder method |
US10359503B2 (en) | 2015-02-03 | 2019-07-23 | Nec Corporation | Position estimation apparatus, position estimation system, position estimation method and recording medium for position estimation |
Also Published As
Publication number | Publication date |
---|---|
JP2640468B2 (en) | 1997-08-13 |
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Legal Events
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R250 | Receipt of annual fees |
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EXPY | Cancellation because of completion of term | ||
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