JP3225352B2 - Radio rangefinder - Google Patents
Radio rangefinderInfo
- Publication number
- JP3225352B2 JP3225352B2 JP10596598A JP10596598A JP3225352B2 JP 3225352 B2 JP3225352 B2 JP 3225352B2 JP 10596598 A JP10596598 A JP 10596598A JP 10596598 A JP10596598 A JP 10596598A JP 3225352 B2 JP3225352 B2 JP 3225352B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pulse
- wave
- signal
- radio
- 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.)
- Expired - Fee Related
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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、電波距離計に関
し、特に、温度ドリフトによって送受信回路内の信号伝
達時間が変化し、その影響により測定精度が低下するこ
とを防ぐ電波距離計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio range finder, and more particularly to a radio range finder that prevents a signal transmission time in a transmission / reception circuit from changing due to a temperature drift, thereby preventing measurement accuracy from being reduced by the influence.
【０００２】[0002]
【従来の技術】電波距離計の従来例を図４を参照して説
明する。基準パルス発生器１１の発生する基準パルスＰ
に同期してパルス送信回路１２より送信パルスＳが送信
され、この送信パルスＳに対応する電波が送信アンテナ
１３を介して送信される。ここで、パルス送信回路１２
は基準パルスＰを受信してから送信パルスＳを送信する
までに遅延時間ｔs を発生する。被測定物で反射した電
波は受信アンテナ２１により受信され、受信回路２２で
検出されて反射信号Ｒ’が得られる。送信／受信アンテ
ナ間の電波の往復時間をｔa とする。そして、受信回路
２２は反射電波Ｒを受信してから反射信号Ｒ’を出力す
るまでに遅延時間ｔr を発生する。送信アンテナ１３か
ら受信アンテナ２１にリークした電波ｒも同様に受信回
路２２で検出され、リーク波信号ｒ’が得られる。2. Description of the Related Art A conventional radio range finder will be described with reference to FIG. Reference pulse P generated by reference pulse generator 11
A transmission pulse S is transmitted from the pulse transmission circuit 12 in synchronization with the transmission pulse S, and a radio wave corresponding to the transmission pulse S is transmitted via the transmission antenna 13. Here, the pulse transmission circuit 12
Generates a delay time t s from the reception of the reference pulse P to the transmission of the transmission pulse S. The radio wave reflected by the device under test is received by the receiving antenna 21 and detected by the receiving circuit 22 to obtain a reflected signal R '. A radio wave round trip time between transmitting / receiving antennas and t a. Then, the receiving circuit 22 generates a delay time t r to the to the output of the reflected signal R 'from the reception of the reflected wave R. The radio wave r leaked from the transmitting antenna 13 to the receiving antenna 21 is similarly detected by the receiving circuit 22, and a leak wave signal r 'is obtained.
【０００３】第１パルス発生回路３１は反射信号Ｒ’に
追尾する反射信号捕捉パルスＲ”を出力する。第２パル
ス発生回路３３１はリーク波信号ｒ’に追尾するリーク
波捕捉パルスｒ”を出力する。第１時間検出回路３２
は、反射信号捕捉パルスＲ”と基準パルスＰの間の時間
差ｔb ＝送信回路の遅延時間ｔs ＋送信／受信アンテナ
間の電波の往復時間ｔa＋受信回路の遅延時間ｔr を検
出し、時間差に対応する計測電圧Ｖb ＝ηｔb を発生す
る。第２時間検出回路３３２はリーク波捕捉パルスｒ”
と基準パルスＰの間の時間差ｔc ＝送信回路の遅延時間
ｔs ＋受信回路の遅延時間ｔr を検出し、この時間差に
対応する補償電圧Ｖc ＝ηｔc を発生する。ηは時間／
電圧変換の係数を表す。[0003] The first pulse generating circuit 31 generates a reflected signal R '.
Reflected signal to trackcaptureThe pulse R "is output.
The leak generation circuit 331 detects a leak following the leak wave signal r '.
A wave capture pulse r "is output. The first time detection circuit32
Is the time between the reflected signal capture pulse R "and the reference pulse P
Difference tb= Delay time t of transmission circuits+ Transmit / receive antenna
Round trip time t of radio wave betweena+ Delay time t of receiving circuitrDetect
Output and the measured voltage V corresponding to the time differenceb= ΗtbGenerate
You. Second time detection circuit332Is the leak wave capture pulse r "
Difference t between the reference pulse Pc= Transmission circuit delay time
ts+ Delay time t of receiving circuitrIs detected and this time difference
Corresponding compensation voltage Vc= ΗtcOccurs. η is time /
Indicates the voltage conversion coefficient.
【０００４】次いで、差動回路３４において計測電圧Ｖ
b と補償電圧Ｖc の差である距離電圧Ｖout ＝Ｖb −Ｖ
c ＝η（ｔb 一ｔc ）＝ηｔa を出力する。この距離電
圧Ｖ out ＝ηｔa が送信／受信アンテナ間の電波の往復
時間、即ち往復距離に対応する電圧である。ところで、
距離電圧Ｖout には測定距離がゼロであるものとした場
合に第１時間検出回路３２が示すオフセット電圧Ｖosが
含まれているので、オフセット回路３３３を具備してオ
フセット電圧Ｖosに等しいゼロ調整オフセット電圧
Ｖos’を発生せしめ、これと補償電圧Ｖc とを差動回路
３４において共に差し引き、測定距離ゼロの際の距離電
圧を調整する。Next, the measured voltage V
bAnd compensation voltage VcDistance voltage V which is the difference betweenout= Vb-V
c= Η (tbOne tc) = ΗtaIs output. This distance
Pressure V out= ΗtaIs the round trip of the radio wave between the transmitting and receiving antennas
It is a voltage corresponding to time, that is, a reciprocating distance. by the way,
Distance voltage VoutIs the field where the measurement distance is assumed to be zero.
The offset voltage V indicated by the first time detection circuit 32osBut
Since it is included, an offset circuit 333 is provided to
Offset voltage VosZero offset voltage equal to
Vos′, And this and the compensation voltage VcAnd the differential circuit
34 are subtracted together to obtain the distance electric power when the measurement distance is zero.
Adjust pressure.
【０００５】ここで、パルス送信回路１２において発生
する遅延時間をｔs とし、受信回路２２において発生す
る遅延時間をｔr としているが、これらの遅延時間は電
波距離計の曝される温度により変化する。第１時間検出
回路３２における反射信号捕捉パルスＲ”と基準パルス
Ｐの間の時間差ｔb ＝ｔs ＋ｔa ＋ｔr は、温度変化に
よりｔb ’＝ｔs ’＋ｔa ＋ｔr ’となる。ここで、ｔ
b ’、ｔs ’、ｔr ’は温度が変化した場合の時間差を
示す。同様に、第２時間検出回路３３２におけるリーク
波捕捉パルスｒ”と基準パルスＰとの間の時間差ｔc ＝
ｔs ＋ｔr は温度変化によりｔc ’＝ｔs ’＋ｔr ’と
なる。ｔc ’、ｔs ’、ｔr ’は温度が変化した場合の
時間差を示す。以上の変化した時間差に対応して計測電
圧Ｖ b ＝ηtb’および補償電圧Ｖ c ＝ηｔc が得られ
る。これらの差電圧を差動回路３４においてとることに
より、温度が変化した時の出力距離電圧Ｖ out ＝ηｔa
を得ることができる。[0005] Here, a delay time occurring in the pulse transmission circuit 12 and t s, but the delay time occurring in the receiving circuit 22 is set to t r, varies with temperature of these delay times are exposed electric wave rangefinder I do. Time difference t b = t s + t a + t r between the reflective signal acquisition pulse R "and reference pulse P in the first hour detection circuit 32 becomes t b '= t s' + t a + t r' by changes in temperature. Where t
b ′, t s ′, and tr ′ indicate time differences when the temperature changes. Similarly, the time difference t c between the leak wave trapping pulse r ″ and the reference pulse P in the second time detection circuit 332 =
t s + t r is the t c '= t s' + t r' by changes in temperature. t c ′, t s ′, and tr ′ indicate time differences when the temperature changes. The measured voltage V b = η tb ′ and the compensation voltage V c = ηt c are obtained corresponding to the changed time difference. By taking these differential voltage in the differential circuit 34, the output length voltage V out = ηt a when the temperature changes
Can be obtained.
【０００６】[0006]
【発明が解決しようとする課題】以上の電波距離計の従
来例は、結局、送信回路および受信回路内部において発
生する温度変化に起因する時間遅延が相殺され、温度ド
リフトによる電波距離計の測定精度の低下を防止するこ
とができるものである。しかし、送信アンテナと受信ア
ンテナの間のリーク波信号は測定距離に関わらずに常に
一定であるのに対して、反射信号は測定距離に対応して
大きくなり、或いは小さくなる。特に、反射信号が小さ
い場合、受信回路の増幅度を大きくしてこれを増幅する
ことによりリーク波信号もこれに比例して大きくなる。In the conventional example of the radio range finder described above, the time delay caused by the temperature change generated in the transmission circuit and the reception circuit is canceled out, and the measurement accuracy of the radio range finder due to the temperature drift is eventually reduced. Can be prevented from decreasing. However, while the leak wave signal between the transmitting antenna and the receiving antenna is always constant irrespective of the measurement distance, the reflected signal increases or decreases according to the measurement distance. In particular, when the reflected signal is small, by increasing the amplification degree of the receiving circuit and amplifying it, the leak wave signal also increases in proportion to this.
【０００７】図６を参照するに、反射信号Ｒ’を適正に
増幅することにより、レベルの大きいリーク波信号ｒ’
は過大に増幅されることになる。リーク波信号ｒ’が過
大に増幅されてそのパルス幅は増大し、これに起因して
リーク波捕捉パルスｒ”の発生位置が変化し、補償電圧
発生回路に誤差が生ずる。これは、リーク波が送信アン
テナと受信アンテナとの間という常に一定の減衰量を示
す経路を伝播してレベル一定のリーク波信号ｒ’と反射
信号Ｒ’の間にレベル差が生ずることによる。Referring to FIG. 6, by appropriately amplifying the reflected signal R ', a high-level leak wave signal r' is obtained.
Will be excessively amplified. The leak wave signal r 'is excessively amplified and its pulse width is increased. As a result, the position where the leak wave capturing pulse r "is generated changes, and an error occurs in the compensation voltage generating circuit. Propagates along a path between the transmitting antenna and the receiving antenna, which always shows a constant amount of attenuation, and a level difference occurs between the leak wave signal r 'and the reflected signal R' having a constant level.
【０００８】この発明は、上述の問題を解消した温度変
化に対する測定精度を改善した電波距離計を提供するも
のである。An object of the present invention is to provide a radio range finder which solves the above-described problem and has improved measurement accuracy with respect to a temperature change.
【０００９】[0009]
【課題を解決するための手段】請求項１：基準パルスＰ
を発生する基準パルス発生器１１を具備し、基準パルス
Ｐに同期して送信パルスＳを発生するパルス送信回路１
２を具備し、送信パルスＳを電波に変換して被測定物に
送信する送信アンテナ１３を具備し、被測定物で反射さ
れた電波を受信して反射波Ｒを出力する受信アンテナ２
１を具備し、パルス送信回路１２と受信アンテナ２１と
の間に接続されて補正波ｒd を出力する可変減衰器２３
を具備し、受信アンテナ２１と可変減衰器２３の相互接
続点に接続される受信回路２２を具備し、受信回路２２
の出力から反射信号Ｒ’を選択する反射信号選択回路３
５を具備し、反射信号Ｒ’に追尾して反射信号捕捉パル
スＲ”を発生する第１パルス発生器３１を具備し、反射
信号補足パルスＲ”と基準パルスＰとを入力してその時
間差を検出し、時間差に対応する計測電圧Ｖb ＝ηｔb
を出力する第１時間検出回路３２を具備し、受信回路２
２の出力から補正波信号ｒd ’を選択する補正波選択回
路３６を具備し、補正波信号ｒd ’に追尾して補正波補
足パルスｒd ”を発生する第２パルス発生回路３３１を
具備し、補正波補足パルスｒd ”と基準パルスＰとを入
力してその時間差を検出し、時間差に対応する補償電圧
Ｖc ＝ηｔc を出力する第２時間検出回路３３２を具備
し、計測電圧Ｖb と補償電圧Ｖc の差を検出して距離電
圧Ｖout ＝ηｔa を出力する差動回路３４を具備する電
波距離計を構成した。Means for Solving the Problems Claim 1: Reference pulse P
A pulse transmission circuit 1 that includes a reference pulse generator 11 that generates a transmission pulse S in synchronization with a reference pulse P.
2, a transmission antenna 13 for converting a transmission pulse S into a radio wave and transmitting the radio wave to the device under test, and receiving a radio wave reflected by the device under test and outputting a reflected wave R.
1 comprises a variable attenuator 23 to output a corrected wave r d is connected between the pulse transmitting circuit 12 and receiving antenna 21
And a receiving circuit 22 connected to an interconnection point between the receiving antenna 21 and the variable attenuator 23.
Signal selection circuit 3 for selecting the reflection signal R 'from the output of
5, a first pulse generator 31 that generates a reflected signal capture pulse R ″ by tracking the reflected signal R ′, and receives a reflected signal supplementary pulse R ″ and a reference pulse P, and determines the time difference between them. Detected and measured voltage V b = ηt b corresponding to time difference
The first time detection circuit 32 that outputs
2 is provided with a correction wave selection circuit 36 for selecting a correction wave signal r d ′ from the output of the second signal, and a second pulse generation circuit 331 for generating a correction wave supplementary pulse r d ″ following the correction wave signal r d ′ is provided. A second time detection circuit 332 that receives the correction wave supplementary pulse r d ″ and the reference pulse P, detects the time difference therebetween, and outputs a compensation voltage V c = ηt c corresponding to the time difference. and configure the radio wave distance meter comprising a differential circuit 34 for outputting a distance voltage V out = ηt a detects a difference between V b and the compensation voltage V c.
【００１０】そして、請求項２：請求項１に記載される
電波距離計において、補正波選択回路３６の出力を可変
減衰器２３に帰還してその減衰量を制御する可変減衰器
制御回路３８を具備する電波距離計を構成した。 また、請求項３：請求項２記載される電波距離計におい
て、受信回路２２にＡＧＣ増幅器２２１を付加せしめ、
反射信号選択回路３５の出力をＡＧＣ増幅器２２１に帰
還してその利得を制御するＡＧＣ増幅器制御回路３７を
具備する電波距離計を構成した。In a preferred embodiment of the present invention, the variable attenuator control circuit 38 controls the amount of attenuation by feeding back the output of the correction wave selection circuit 36 to the variable attenuator 23. A radio range finder was constructed. Further, in the radio rangefinder according to the third aspect, an AGC amplifier 221 is added to the receiving circuit 22,
A radio rangefinder including an AGC amplifier control circuit 37 for controlling the gain by feeding back the output of the reflection signal selection circuit 35 to the AGC amplifier 221 was constructed.
【００１１】更に、請求項４：請求項１ないし請求項３
の内の何れかに記載される電波距離計において、第１時
間検出回路３２に含まれる測定距離をゼロとした時のオ
フセット電圧を補正するた補正電圧を発生するオフセッ
ト回路３３３を具備する電波距離計を構成した。[0011] Claim 4: Claims 1 to 3
The radio rangefinder according to any one of the above, further comprising an offset circuit 333 that generates a correction voltage for correcting an offset voltage when the measurement distance included in the first time detection circuit 32 is set to zero. The meter was configured.
【００１２】[0012]
【発明の実施の形態】この発明の実施の形態を図１の実
施例を参照して説明する。１１は基準パルスＰを発生す
る基準パルス発生器を示す。１２は基準パルス発生器１
１の発生する基準パルスＰに同期して送信パルスＳを発
生するパルス送信回路である。１３は送信アンテナであ
り、パルス送信回路１２の出力する送信パルスＳを電波
に変換して被測定物に送信する。ここで、パルス送信回
路１２は基準パルスＰを受信してから送信パルスＳを送
信するまでに遅延時間ｔs を発生する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the embodiment shown in FIG. Reference numeral 11 denotes a reference pulse generator that generates a reference pulse P. 12 is a reference pulse generator 1
This is a pulse transmission circuit that generates a transmission pulse S in synchronization with the reference pulse P generated by the “1”. A transmission antenna 13 converts a transmission pulse S output from the pulse transmission circuit 12 into a radio wave and transmits the radio wave to the device under test. Here, the pulse transmission circuit 12 generates a delay time t s from when the reference pulse P is received to when the transmission pulse S is transmitted.
【００１３】２１は被測定物において反射した電波を受
信する受信アンテナである。２２は受信アンテナ２１の
出力を増幅、検波する受信回路である。２３はパルス送
信回路１２と受信回路２２の間に従来例のリーク波ｒに
代えて使用される補正波ｒdを通す可変減衰器であり、
この発明において付加されるものである。２２１は自動
利得制御するＡＧＣ増幅器であり、受信回路２２に付加
されてその出力を一定に保持する回路である。受信回路
２２とＡＧＣ増幅器２２１は、反射電波を受信してから
反射信号Ｒ’を出力するまでに遅延時間ｔr を発生す
る。Reference numeral 21 denotes a receiving antenna for receiving radio waves reflected from the device under test. A receiving circuit 22 amplifies and detects the output of the receiving antenna 21. 23 is a variable attenuator through a correction wave r d used in place of a conventional example of a leakage wave r between pulse transmission circuit 12 and reception circuit 22,
It is added in the present invention. An AGC amplifier 221 for automatic gain control is a circuit added to the receiving circuit 22 to keep its output constant. Receiving circuit 22 and the AGC amplifier 221 generates a delay time t r to the to the output of the reflected signal R 'from the reception of the reflected waves.
【００１４】３５は受信回路２２の出力する反射信号
Ｒ’および補正波信号ｒd ’から反射信号Ｒ’を選択す
る反射信号選択回路である。３１は反射信号選択回路３
５の選択出力する反射信号Ｒ’に追尾する反射信号捕捉
パルスＲ”を発生する第１パルス発生回路である。３２
は第１時間検出回路であり、第１パルス発生回路３１の
出力する反射信号補足パルスＲ”と基準パルスＰの間の
時間差ｔb ＝ｔs ＋ｔa＋ｔr を検出し、この時間差に
対応する計測電圧Ｖb ＝ηｔb を出力する。ηは時間／
電圧変換の係数を表す。A reflection signal selection circuit 35 selects a reflection signal R ′ from the reflection signal R ′ output from the reception circuit 22 and the correction wave signal r d ′. 31 is a reflection signal selection circuit 3
5 is a first pulse generation circuit that generates a reflected signal capture pulse R ″ that tracks the selectively output reflected signal R ′.
Is first hour detection circuit detects the time difference t b = t s + t a + t r between the output reflecting signals supplemental pulse R "and reference pulse P of the first pulse generating circuit 31, corresponding to the time difference measurement voltage V b = ηt b outputs the .η time /
Indicates the voltage conversion coefficient.
【００１５】３６は受信回路２２の出力する反射信号
Ｒ’および補正波信号ｒd ’から補正波信号ｒd ’を選
択する補正波選択回路である。ここで、３３は補償電圧
発生回路であり、補正波選択回路３６により選択された
補正波信号ｒd ’を受信して第１時間検出回路３２に含
まれる誤差分を補正する補償電圧Ｖ c ＝ηｔc を発生す
る回路である。この補償電圧発生回路３３はパルス送信
回路１２と受信回路２２の間の可変減衰器２３を通過し
た補正波ｒd に追尾して補正波補足パルスｒd ”を発生
する第２パルス発生回路３３１と、補正波補足パルスｒ
d ”と基準パルスＰとの間の時間差ｔc ＝ｔs ＋ｔr を
検出してこの時間差に対応する補償電圧Ｖc ＝ηｔc を
発生する第２時間検出回路３３２より成る。ηは時間／
電圧変換の係数を表す。そして、補償電圧発生回路３３
は、更に、第１時間検出回路３２に含まれる測定距離を
ゼロとした時のオフセット電圧を補正する補償電圧を発
生するオフセット回路３３３をも具備している。[0015] 36 is a correction wave selection circuit for selecting a correction wave signal r d 'from the reflected signal R' and the correction wave signal r d 'output to the receiving circuit 22. Here, reference numeral 33 denotes a compensation voltage generation circuit, which receives the correction wave signal r d ′ selected by the correction wave selection circuit 36 and corrects an error included in the first time detection circuit 32 by a compensation voltage V c = This is a circuit that generates ηt c . The compensation voltage generating circuit 33 and the second pulse generation circuit 331 for generating a "correction wave supplemental pulse r d and tracking the correction wave r d which has passed through the variable attenuator 23 between the pulse transmitting circuit 12 receiving circuit 22 , Correction wave supplement pulse r
d "between the reference pulse time difference between P t c = t s + t .η consisting second time detection circuit 332 r detect and generates a compensation voltage V c = ηt c corresponding to the time difference time /
Indicates the voltage conversion coefficient. Then, the compensation voltage generation circuit 33
Further includes an offset circuit 333 that generates a compensation voltage for correcting the offset voltage when the measurement distance included in the first time detection circuit 32 is set to zero.
【００１６】３４は差動回路であり、第１時間検出回路
３２の出力する計測電圧Ｖb と補償電圧発生回路３３の
第２時間検出回路３３２から出力される補償電圧Ｖc の
差を検出して被測定物までの距離に対応する距離電圧Ｖ
out ＝ηｔa を出力する。３７はＡＧＣ増幅器２２１の
制御を行うＡＧＣ増幅器制御回路である。３８は可変減
衰器２３を制御して補正波ｒd の大きさを制御する可変
減衰器制御回路である。[0016] 34 is a differential circuit detects the difference between the compensation voltage V c output from the second time detection circuit 332 of the output measuring voltage V b and the compensation voltage generating circuit 33 of the first hour detection circuit 32 Distance voltage V corresponding to the distance to the DUT
and it outputs the out = ηt a. An AGC amplifier control circuit 37 controls the AGC amplifier 221. 38 is a variable attenuator control circuit for controlling the magnitude of the correction wave r d by controlling the variable attenuator 23.
【００１７】基準パルス発生器１１の発生する基準パル
スＰに同期してパルス送信回路１２から送信パルスＳを
送信すると、送信アンテナ１３を介して送信パルスＳに
対応する電波が送信される。被測定物で反射された電波
は受信アンテナ２１により受信、受信回路２２により検
出され、ＡＧＣ増幅器２２１を介して反射信号Ｒ’が得
られる。パルス送信回路１２から送信され可変減衰器２
３を通過した送信パルスＳは、受信回路２２により検出
され、ＡＧＣ増幅器２２１を介して補正波信号ｒd ’が
得られる。反射信号Ｒ’は反射信号選択回路３５により
選択、出力される。補正波信号ｒd ’は補正波選択回路
３６により選択、出力される。この反射信号Ｒ’はＡＧ
Ｃ増幅器制御回路３７を介して受信回路２２のＡＧＣ御
増幅器２２１に帰還され、その利得を制御する。補正波
信号ｒd ’は可変減衰器制御回路３８を介して可変減衰
器２３に帰還され、反射信号Ｒ’の大きさと補正波
ｒd ’の大きさを等しくすべく可変減衰器２３の減衰量
を制御する。When the transmission pulse S is transmitted from the pulse transmission circuit 12 in synchronization with the reference pulse P generated by the reference pulse generator 11, a radio wave corresponding to the transmission pulse S is transmitted via the transmission antenna 13. The radio wave reflected by the device under test is received by the receiving antenna 21 and detected by the receiving circuit 22, and a reflected signal R ′ is obtained via the AGC amplifier 221. Variable attenuator 2 transmitted from pulse transmission circuit 12
The transmission pulse S that has passed through 3 is detected by the receiving circuit 22, and a correction wave signal r d ′ is obtained via the AGC amplifier 221. The reflection signal R 'is selected and output by the reflection signal selection circuit 35. The correction wave signal r d ′ is selected and output by the correction wave selection circuit 36. This reflection signal R ′ is AG
The signal is fed back to the AGC control amplifier 221 of the receiving circuit 22 via the C amplifier control circuit 37 to control the gain. Correction wave signal r d 'is fed back to the variable attenuator 23 through the variable attenuator control circuit 38, the reflected signal R' attenuation of the variable attenuator 23 so as to equal the size and correction wave magnitude of r d 'of Control.
【００１８】ここで、電波距離計の動作を説明するに、
第１パルス発生回路３１は反射信号Ｒ’に追尾する反射
信号捕捉パルスＲ”を出力し、第１時間検出回路３２は
この反射信号捕捉パルスＲ”と基準パルスＰとの間の時
間差ｔb ＝ｔs ＋ｔa ＋ｔrを検出する。この時間差ｔ
b に対応する計測電圧Ｖb ＝ηｔb を発生する。ここ
で、ηは時間／電圧変換の係数を表す。一方、第２パル
ス発生回路３３１は補正波信号ｒd ’に追尾する補正波
補足パルスｒd ”を出力し、第２時間検出回路３３２は
この補正波補足パルスｒd ”と基準パルスＰとの間の時
間差ｔc ＝ｔs ＋ｔr を検出する。この時間差ｔc に対
応する補償電圧Ｖc ＝ηｔc を発生する。ここでηは時
間／電圧変換の係数を表す。The operation of the radio range finder will now be described.
The first pulse generating circuit 31 outputs a reflected signal capturing pulse R ″ that tracks the reflected signal R ′, and the first time detecting circuit 32 generates a time difference t b = between the reflected signal capturing pulse R ″ and the reference pulse P. to detect the t s + t a + t r . This time difference t
corresponds to b to generate a measurement voltage V b = ηt b. Here, η represents a time / voltage conversion coefficient. On the other hand, the second pulse generation circuit 331 outputs a correction wave supplementary pulse r d ″ that tracks the correction wave signal r d ′, and the second time detection circuit 332 outputs the correction wave supplementary pulse r d ″ and the reference pulse P. A time difference t c = t s + t r is detected. Generating a compensation voltage V c = ηt c corresponding to the time difference t c. Here, η represents a time / voltage conversion coefficient.
【００１９】次いで、差動回路３４において計測電圧Ｖ
b ＝ηｔb と補償電圧Ｖc ＝ηｔcの差である距離電圧
Ｖout ＝（Ｖb −Ｖc ＝ηｔb 一ηｔc ）＝ηｔa を出
力する。この距離電圧Ｖout が送信／受信アンテナ間の
電波の往復時間或いは往復距離に対応する電圧である。
なお、距離電圧Ｖout には測定距離がゼロであるにもか
かわらず第１時間検出回路出力３２が発生するオフセッ
ト電圧Ｖosが含まれるので、別途オフセット回路３３３
を設け、差動回路３４においてオフセット電圧Ｖosと等
しいゼロ調整用オフセット電圧Ｖos’を補償電圧Ｖc と
一緒に差し引いて、測定距離ゼロの際の距離電圧を調整
する。Next, in the differential circuit 34, the measured voltage V
b = ηt b and the compensation voltage V c = ηt distance voltage which is the difference between c V out = (V b -V c = ηt b one ηt c) = outputs the ηt a. This distance voltage Vout is a voltage corresponding to the round-trip time or the round-trip distance of the radio wave between the transmitting / receiving antennas.
Since the distance voltage Vout includes the offset voltage Vos generated by the first time detection circuit output 32 even though the measured distance is zero, the offset circuit 333 is separately provided.
The provided, by subtracting the offset voltage V os equal zero adjustment offset voltage V os' with compensation voltage V c in the differential circuit 34, to adjust the distance voltage when the measured distance zero.
【００２０】以上の電波距離計においては、送信アンテ
ナと受信アンテナとの間のリーク波ｒに代えて可変減衰
器を伝送せしめた補正波ｒd を使用して補償電圧Ｖc を
発生せしめる構成を採用することにより、補正波信号ｒ
d ’と反射信号Ｒのレベルを常に等しく制御して測定距
離に無関係に誤差の小さい高い測定精度を示す電波距離
計を提供する。[0020] In the above radio wave rangefinder, the structure allowed to generate a compensation voltage V c by using the correction wave r d that allowed transmission of the variable attenuator in place of the leak wave r between the transmit and receive antennas By adopting the correction wave signal r
Provided is a radio rangefinder which always controls the level of d 'and the reflection signal R to be equal to each other and has a high measurement accuracy with a small error regardless of the measurement distance.
【００２１】[0021]
【発明の効果】以上の通りであって、この発明に依れ
ば、可変減衰器とＡＧＣ増幅器制御回路と可変減衰器制
御回路により、常に反射信号と補正波信号とが等しい強
度に制御して、温度ドリフトによる誤差が小さく、リー
ク波信号と反射信号の間のレベル差に因らずに高い測定
精度を示す電波距離計を提供することができる。As described above, according to the present invention, the reflected signal and the correction wave signal are always controlled to have the same intensity by the variable attenuator, the AGC amplifier control circuit, and the variable attenuator control circuit. In addition, it is possible to provide a radio rangefinder which has a small error due to temperature drift and exhibits high measurement accuracy regardless of the level difference between the leak wave signal and the reflected signal.
【図１】実施例を説明するブロック図。FIG. 1 is a block diagram illustrating an embodiment.
【図２】図１におけるパルスタイミングを説明する図。FIG. 2 is a view for explaining pulse timing in FIG. 1;
【図３】補正波信号と反射信号のレベルの関係を説明す
る図。FIG. 3 is a view for explaining the relationship between the levels of a correction wave signal and a reflection signal.
【図４】従来例を説明するブロック図。FIG. 4 is a block diagram illustrating a conventional example.
【図５】図４におけるパルスタイミングを説明する図。FIG. 5 is a view for explaining pulse timing in FIG. 4;
【図６】リーク波信号と反射信号のレベルの関係を説明
する図。FIG. 6 is a view for explaining the relationship between the levels of a leak wave signal and a reflected signal.
１１ 基準パルス発生器 １２ パルス送信回路 １３ 送信アンテナ ２３ 可変減衰器 ２２ 受信回路 ３５ 反射信号選択回路 ３１ 第１パルス発生器 ３２ 第１時間検出回路 ３６ 補正波選択回路 ３３１ 第２パルス発生回路 ３３２ 第２時間検出回路 ３４ 差動回路 DESCRIPTION OF SYMBOLS 11 Reference pulse generator 12 Pulse transmission circuit 13 Transmission antenna 23 Variable attenuator 22 Receiving circuit 35 Reflection signal selection circuit 31 First pulse generator 32 First time detection circuit 36 Correction wave selection circuit 331 Second pulse generation circuit 332 Second Time detection circuit 34 Differential circuit
フロントページの続き (56)参考文献 特開 平８−25420（ＪＰ，Ａ) 特開 平１−292281（ＪＰ，Ａ) 特開 平10−282216（ＪＰ，Ａ) 特開 平３−188389（ＪＰ，Ａ) 特開 昭49−15393（ＪＰ，Ａ) 特公 昭56−5951（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) G01S 7/00 - 7/42 G01S 13/00 - 13/95 Continuation of front page (56) References JP-A-8-25420 (JP, A) JP-A-1-292281 (JP, A) JP-A-10-282216 (JP, A) JP-A-3-188389 (JP) JP-A-49-15393 (JP, A) JP-B-56-5951 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) G01S 7 /00-7/42 G01S 13/00-13/95
Claims (4)
を具備し、 基準パルスに同期して送信パルスを発生するパルス送信
回路を具備し、 送信パルスを電波に変換して被測定物に送信する送信ア
ンテナを具備し、 被測定物により反射した電波を受信して反射波を出力す
る受信アンテナを具備し、 パルス送信回路と受信アンテナとの間に接続されて補正
波を出力する可変減衰器を具備し、 受信アンテナと可変減衰器の相互接続点に接続される受
信回路を具備し、 受信回路の出力から反射信号を選択する反射信号選択回
路を具備し、 反射信号に追尾して反射信号捕捉パルスを発生する第１
パルス発生器を具備し、 反射信号補足パルスと基準パルスとを入力してその時間
差を検出し、時間差に対応する計測電圧を出力する第１
時間検出回路を具備し、 受信回路の出力から補正波信号を選択する補正波選択回
路を具備し、 補正波信号に追尾して補正波補足パルスを発生する第２
パルス発生回路を具備し、 補正波補足パルスと基準パルスとを入力してその時間差
を検出し、時間差に対応する補償電圧を出力する第２時
間検出回路を具備し、 計測電圧と補償電圧の差を検出して距離電圧を出力する
差動回路を具備することを特徴とする電波距離計。1. A reference pulse generator for generating a reference pulse, a pulse transmission circuit for generating a transmission pulse in synchronization with the reference pulse, a transmission pulse is converted into a radio wave and transmitted to a device under test. A variable attenuator that includes a transmitting antenna, receives a radio wave reflected by the device under test, and outputs a reflected wave, and is connected between the pulse transmitting circuit and the receiving antenna and outputs a correction wave. A receiving circuit connected to an interconnection point between the receiving antenna and the variable attenuator; a reflection signal selecting circuit for selecting a reflected signal from an output of the receiving circuit; and capturing a reflected signal by tracking the reflected signal First to generate a pulse
A first pulse generator which receives a reflected signal supplementary pulse and a reference pulse, detects a time difference therebetween, and outputs a measured voltage corresponding to the time difference;
A second detection circuit that includes a time detection circuit, includes a correction wave selection circuit that selects a correction wave signal from an output of the reception circuit, and generates a correction wave supplementary pulse by tracking the correction wave signal.
A second time detection circuit that receives a correction wave supplementary pulse and a reference pulse, detects a time difference therebetween, and outputs a compensation voltage corresponding to the time difference, and includes a difference between the measured voltage and the compensation voltage. A radio range finder, comprising: a differential circuit for detecting a distance and outputting a distance voltage.
て、 補正波選択回路の出力を可変減衰器に帰還してその減衰
量を制御する可変減衰器制御回路を具備することを特徴
とする電波距離計。2. The radio rangefinder according to claim 1, further comprising a variable attenuator control circuit for controlling an amount of attenuation by returning an output of the correction wave selection circuit to the variable attenuator. Radio rangefinder.
て、 受信回路にＡＧＣ増幅器を付加せしめ、 反射信号選択回路の出力をＡＧＣ増幅器に帰還してその
利得を制御するＡＧＣ増幅器制御回路を具備することを
特徴とする電波距離計。3. The radio rangefinder according to claim 2, further comprising an AGC amplifier control circuit for adding an AGC amplifier to the receiving circuit, and feeding back the output of the reflection signal selection circuit to the AGC amplifier to control the gain thereof. A radio range finder, characterized in that:
記載される電波距離計において、 第１時間検出回路に含まれる測定距離をゼロとした時の
オフセット電圧を補正するた補正電圧を発生するオフセ
ット回路を具備することを特徴とする電波距離計。4. The radio rangefinder according to claim 1, wherein a correction voltage for correcting an offset voltage when a measurement distance included in the first time detection circuit is set to zero. A radio range finder comprising an offset circuit for generating a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10596598A JP3225352B2 (en) | 1998-04-16 | 1998-04-16 | Radio rangefinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10596598A JP3225352B2 (en) | 1998-04-16 | 1998-04-16 | Radio rangefinder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11304908A JPH11304908A (en) | 1999-11-05 |
| JP3225352B2 true JP3225352B2 (en) | 2001-11-05 |
Family
ID=14421512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10596598A Expired - Fee Related JP3225352B2 (en) | 1998-04-16 | 1998-04-16 | Radio rangefinder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3225352B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001084177A1 (en) * | 2000-05-01 | 2001-11-08 | Tokimec Inc. | Radio range finder |
| JP2007078518A (en) * | 2005-09-14 | 2007-03-29 | Japan Radio Co Ltd | Distance measuring apparatus |
| JP2009175091A (en) * | 2008-01-28 | 2009-08-06 | Nec Corp | Radar device, compensation method of receiving level and program |
| JP4837770B2 (en) * | 2009-10-30 | 2011-12-14 | 東京計器株式会社 | Temperature compensation method for radio rangefinder |
| JP6973821B1 (en) * | 2020-06-24 | 2021-12-01 | 株式会社エヌエステイー | Distance measuring device and distance measuring method using it |
-
1998
- 1998-04-16 JP JP10596598A patent/JP3225352B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11304908A (en) | 1999-11-05 |
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