JPH0446731U - - Google Patents
Info
- Publication number
- JPH0446731U JPH0446731U JP1990087490U JP8749090U JPH0446731U JP H0446731 U JPH0446731 U JP H0446731U JP 1990087490 U JP1990087490 U JP 1990087490U JP 8749090 U JP8749090 U JP 8749090U JP H0446731 U JPH0446731 U JP H0446731U
- Authority
- JP
- Japan
- Prior art keywords
- synchronization signal
- antenna
- antenna switching
- vehicle
- detected
- 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
- 238000001514 detection method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
Landscapes
- Transceivers (AREA)
- Mobile Radio Communication Systems (AREA)
Description
第１図乃至第４図はこの考案に係る車載置用送
受信機の空中線切換装置の実施例を示し、第１図
は機能ブロツク図、第２図はハードの構成ブロツ
ク図、第３図はフローチヤート、第４図はタイミ
ングチヤートである。第５図は従来例の構成ブロ
ツク図である。
主な符号の説明、１……第１の空中線、２……
第２の空中線、３……第３の空中線、４……車載
用送受信機、５……同期信号検出回路、６……空
中線切換信号発生回路、７……空中線切換回路。
Figures 1 to 4 show an embodiment of the antenna switching device for a vehicle-mounted transmitter/receiver according to this invention, with Figure 1 being a functional block diagram, Figure 2 being a hardware configuration block diagram, and Figure 3 being a flowchart. Chart, Figure 4 is a timing chart. FIG. 5 is a block diagram of a conventional example. Explanation of main symbols, 1...first antenna, 2...
Second antenna, 3...Third antenna, 4...Vehicle transceiver, 5...Synchronization signal detection circuit, 6...Antenna switching signal generation circuit, 7...Antenna switching circuit.
Claims (1)
空中線とで構成される車両位置検出システムの車
両側装置において、 前記車両側装置の受信手段で受信した信号より
同期信号を検出する同期信号検出手段と、この同
期信号検出手段によつて同期信号が検出されない
間は同期信号検出手段によつて動作する空中線切
換信号発生手段と、この空中線切換信号発生手段
により出力した空中線切換え信号で動作する空中
線切換回路と、この空中線切換回路によつて切換
えられる複数の空中線とを設け、同期信号検出手
段で同期信号が検出されると、空中線切換回路の
切換え動作を停止し、一つの空中線に車両位置検
出用送受信機が固定して接続されるように構成し
たことを特徴とする車載用送受信機の空中線切換
装置。[Scope of utility model registration claim] A vehicle position detection transceiver mounted on a vehicle,
In a vehicle side device of a vehicle position detection system comprising an antenna, a synchronization signal detection means detects a synchronization signal from a signal received by the reception means of the vehicle side device, and a synchronization signal is detected by the synchronization signal detection means. An antenna switching signal generating means operated by the synchronization signal detecting means while the antenna is not detected; an antenna switching circuit operating according to the antenna switching signal outputted by the antenna switching signal generating means; and a plurality of antennas switched by the antenna switching circuit. antennas, and when a synchronization signal is detected by the synchronization signal detection means, the switching operation of the antenna switching circuit is stopped, and the vehicle position detection transceiver is fixedly connected to one antenna. An antenna switching device for a vehicle-mounted transmitter/receiver, characterized by the following.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990087490U JPH0446731U (en) | 1990-08-23 | 1990-08-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990087490U JPH0446731U (en) | 1990-08-23 | 1990-08-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0446731U true JPH0446731U (en) | 1992-04-21 |
Family
ID=31819873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990087490U Pending JPH0446731U (en) | 1990-08-23 | 1990-08-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0446731U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57184340A (en) * | 1981-05-08 | 1982-11-13 | Nec Corp | Switching circuit of receiver |
| JPH0213021A (en) * | 1988-06-30 | 1990-01-17 | Nec Corp | Transmitter-receiver with antenna trouble detecting function |
-
1990
- 1990-08-23 JP JP1990087490U patent/JPH0446731U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57184340A (en) * | 1981-05-08 | 1982-11-13 | Nec Corp | Switching circuit of receiver |
| JPH0213021A (en) * | 1988-06-30 | 1990-01-17 | Nec Corp | Transmitter-receiver with antenna trouble detecting function |
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