JPS62176776U - - Google Patents
Info
- Publication number
- JPS62176776U JPS62176776U JP17625486U JP17625486U JPS62176776U JP S62176776 U JPS62176776 U JP S62176776U JP 17625486 U JP17625486 U JP 17625486U JP 17625486 U JP17625486 U JP 17625486U JP S62176776 U JPS62176776 U JP S62176776U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- speedometer
- doppler
- time
- speed
- 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
- 238000005259 measurement Methods 0.000 claims description 4
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 12
Landscapes
- Radar Systems Or Details Thereof (AREA)
Description
第１図は従来の電波によるドツプラ速度計の系
統図、第２図は第１図に英小文字で示す要所の信
号波形図、第３図は本考案になる速度計の一実施
例を示す系統図、第４図は本考案になるフイルタ
回路の一実施例を示す特性説明図、第５図は第３
図に英小文字で示す要所の信号波形図、第６図は
時間禁止ゲート回路の一実施例を示す系統図なら
びに要所の信号波形図、第７図は低周波外乱によ
る計測誤差を生ずる場合の一例を示す信号波形図
、第８図は低周波外乱除去の帯域減衰器の一実施
例を示す特性説明図、第９図は本考案になる速度
計に上記低周波外乱除去の帯域濾波器を付加した
例を示す系統図である。
１……アンテナ、２……送受信器、３と１２…
…フイルタ回路、４……増巾器、５……ゼロクロ
ス回路、６……モノステーブル回路、７……計数
回路、８……デイジタル表示器、９……Ｄ／Ａ変
換器、１０……アナログ指示器、１３……時間禁
止ゲート発生器、１４……ＡＮＤ回路、１５……
帯域減衰器、２１……平均値計算及び記憶器、２
２……係数乗算器、２３……逆数計算器、２４…
…デイジタル比較器、２５……クロツク発生器、
２６……ゲート回路、２７……加算カウンタ、２
８……フリツプフロツプ、ａ……ドツプラ信号、
ｂ……ゼロクロス出力信号、ｃ……モノステーブ
ル出力信号、ｄ……時間禁止ゲート信号、ｅ……
時間ゲート信号。
Figure 1 is a system diagram of a conventional Doppler speedometer using radio waves, Figure 2 is a signal waveform diagram of key points shown in lowercase letters in Figure 1, and Figure 3 is an example of the speedometer according to the present invention. System diagram, Fig. 4 is a characteristic explanatory diagram showing one embodiment of the filter circuit according to the present invention, and Fig. 5 is a characteristic diagram showing an embodiment of the filter circuit according to the present invention.
Figure 6 shows a diagram of important signal waveforms shown in lower case letters. Figure 6 is a system diagram showing an example of a time prohibition gate circuit and a diagram of important signal waveforms. Figure 7 shows a case where measurement errors occur due to low-frequency disturbances. A signal waveform diagram showing an example, FIG. 8 is a characteristic explanatory diagram showing an example of a band attenuator for removing low frequency disturbances, and FIG. 9 is a diagram showing the characteristics of a bandpass filter for removing low frequency disturbances in the speedometer according to the present invention. FIG. 2 is a system diagram showing an example in which . 1...Antenna, 2...Transmitter/receiver, 3 and 12...
... Filter circuit, 4 ... Amplifier, 5 ... Zero cross circuit, 6 ... Monostable circuit, 7 ... Counting circuit, 8 ... Digital display, 9 ... D/A converter, 10 ... Analog Indicator, 13... Time prohibition gate generator, 14... AND circuit, 15...
Band attenuator, 21... Average value calculation and storage device, 2
2...Coefficient multiplier, 23...Reciprocal number calculator, 24...
...Digital comparator, 25...Clock generator,
26... Gate circuit, 27... Addition counter, 2
8...Flip-flop, a...Doppler signal,
b... Zero cross output signal, c... Monostable output signal, d... Time prohibition gate signal, e...
Time gate signal.
Claims (1)
と受信周波数との間の偏移周波数をもつドツプラ
信号をフイルタ回路を介して検出しこれをパルス
化してこのパルス化信号を計数処理することによ
り前記移動物体の速度を計測するドツプラ速度計
において、前記ドツプラ速度計の前回から過去数
回の測定速度の平均値に相当する周波数を基準周
波数として、この基準周波数に若干の合理性ある
余裕度を加味した周波数を時間に変換した時間禁
止ゲート信号を前記パルス化信号が計数される毎
に発生するようにした手段と、該時間禁止ゲート
信号発生中は以降余分に発生する前記パルス化信
号の計数を禁止するようにした手段とを設けて、
受信時の外乱信号を除去して計測を行なうように
したことを特徴とする速度計。 (2) 基準周波数として前記ドツプラ速度計の計
測速度範囲における最大速度に相当する周波数を
用いることを特徴とする実用新案登録請求の範囲
第１項記載の速度計。 (3) 基準周波数として前記ドツプラ速度計の前
回の測定時において計測された速度に相当する周
波数を用いることを特徴とする実用新案登録請求
の範囲第１項記載の速度計。[Claims for Utility Model Registration] (1) A moving object is irradiated with radio waves, a Doppler signal having a frequency shift between the transmitting frequency and the receiving frequency is detected via a filter circuit, and this is pulsed. In a Doppler speedometer that measures the speed of the moving object by counting and processing pulsed signals, the standard frequency is set to a frequency corresponding to the average value of the speed measured several times in the past from the previous time of the Doppler speedometer. Means is configured to generate a time prohibition gate signal, which is obtained by converting a frequency with a reasonable margin into time, every time the pulsed signal is counted; means for inhibiting counting of the pulsed signals generated at
A speedometer characterized in that measurement is performed by removing disturbance signals during reception. (2) The speedometer according to claim 1, wherein a frequency corresponding to the maximum speed in the measurement speed range of the Doppler speedometer is used as the reference frequency. (3) The speedometer according to claim 1, wherein the reference frequency is a frequency corresponding to the speed measured in the previous measurement by the Doppler speedometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17625486U JPS62176776U (en) | 1986-11-17 | 1986-11-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17625486U JPS62176776U (en) | 1986-11-17 | 1986-11-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62176776U true JPS62176776U (en) | 1987-11-10 |
Family
ID=31116324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17625486U Pending JPS62176776U (en) | 1986-11-17 | 1986-11-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62176776U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05150035A (en) * | 1991-12-02 | 1993-06-18 | Fujitsu Ten Ltd | Millimeter wave radar distance-speed measuring device |
| JPH05249233A (en) * | 1992-03-09 | 1993-09-28 | Fujitsu Ten Ltd | Millimeter-wave radar equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4979767A (en) * | 1972-12-07 | 1974-08-01 |
-
1986
- 1986-11-17 JP JP17625486U patent/JPS62176776U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4979767A (en) * | 1972-12-07 | 1974-08-01 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05150035A (en) * | 1991-12-02 | 1993-06-18 | Fujitsu Ten Ltd | Millimeter wave radar distance-speed measuring device |
| JPH05249233A (en) * | 1992-03-09 | 1993-09-28 | Fujitsu Ten Ltd | Millimeter-wave radar equipment |
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