JPS6416979A - Method for measuring direction of moving body - Google Patents
Method for measuring direction of moving bodyInfo
- Publication number
- JPS6416979A JPS6416979A JP17365687A JP17365687A JPS6416979A JP S6416979 A JPS6416979 A JP S6416979A JP 17365687 A JP17365687 A JP 17365687A JP 17365687 A JP17365687 A JP 17365687A JP S6416979 A JPS6416979 A JP S6416979A
- Authority
- JP
- Japan
- Prior art keywords
- antennas
- moving body
- phase difference
- stored
- converter
- 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
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
PURPOSE:To measure the direction of a moving body by installing plural antennas on the moving body separately and measuring the phase difference between radio waves. CONSTITUTION:The radio waves from two broadcasting stations are received by the antennas 1 and 2 fixed on the moving body and converted by a frequency switching converter 4 to a measurement frequency (f) which is a common multiple or multiple of their transmission frequencies. The interval between the antennas 1 and 2 is set <=1/2 of the wavelength of the measurement frequency previously. A phase difference measuring instrument 5 detects the phase difference between the measurement frequencies (f) by the antennas 1 and 2 which are converted by the converter 4 and the phase difference is passed through a code discriminator 7 to select one positive or negative value, which is stored in a memory circuit 8. Then an antenna switch 3 switches the antennas, the converter 4 performs conversion to the frequency (f), and one positive or negative value is stored in the circuit 8 through the measuring instrument 5 and discriminator 7. Then an angle detector 9 and an azimuth calculator 10 find a direction angle common to the two transmitting stations from the two phase differences stored in the circuit 8 and the interval between the antennas 1 and 2, and the angle is displayed on a display device 11 as the direction of the moving body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17365687A JPS6416979A (en) | 1987-07-10 | 1987-07-10 | Method for measuring direction of moving body |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17365687A JPS6416979A (en) | 1987-07-10 | 1987-07-10 | Method for measuring direction of moving body |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6416979A true JPS6416979A (en) | 1989-01-20 |
JPH0513586B2 JPH0513586B2 (en) | 1993-02-22 |
Family
ID=15964660
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17365687A Granted JPS6416979A (en) | 1987-07-10 | 1987-07-10 | Method for measuring direction of moving body |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6416979A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6382041U (en) * | 1986-11-17 | 1988-05-30 | ||
US7158078B2 (en) | 2002-04-18 | 2007-01-02 | Fujitsu Limited | Positioning of mobile wireless terminal |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS582764A (en) * | 1981-06-30 | 1983-01-08 | Furuno Electric Co Ltd | Direction finding system using hyperbolic navigation |
-
1987
- 1987-07-10 JP JP17365687A patent/JPS6416979A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS582764A (en) * | 1981-06-30 | 1983-01-08 | Furuno Electric Co Ltd | Direction finding system using hyperbolic navigation |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6382041U (en) * | 1986-11-17 | 1988-05-30 | ||
US7158078B2 (en) | 2002-04-18 | 2007-01-02 | Fujitsu Limited | Positioning of mobile wireless terminal |
US7265716B2 (en) | 2002-04-18 | 2007-09-04 | Fujitsu Limited | Positioning of mobile wireless terminal |
US7304610B2 (en) | 2002-04-18 | 2007-12-04 | Fujitsu Limited | Positioning of mobile wireless terminal |
US7319428B2 (en) | 2002-04-18 | 2008-01-15 | Fujitsu Limited | Positioning of mobile wireless terminal |
Also Published As
Publication number | Publication date |
---|---|
JPH0513586B2 (en) | 1993-02-22 |
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