JPH05203732A - Range finder - Google Patents
Range finderInfo
- Publication number
- JPH05203732A JPH05203732A JP31953391A JP31953391A JPH05203732A JP H05203732 A JPH05203732 A JP H05203732A JP 31953391 A JP31953391 A JP 31953391A JP 31953391 A JP31953391 A JP 31953391A JP H05203732 A JPH05203732 A JP H05203732A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency
- measured
- voltage
- modulated
- 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.)
- Withdrawn
Links
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は被測定物体までの距離を
測定する測距装置に関し、特に一定周波数の変調信号で
搬送波を変調した電磁波（レーダ信号）を被測定物体に
出射して被測定物体で反射されて戻ってくる上記レーダ
信号の反射波を受信しこの反射波の復調信号と上記変調
信号の位相差から被測定物体までの距離を測定する測距
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distance measuring device for measuring a distance to an object to be measured, and particularly to an electromagnetic wave (radar signal) in which a carrier wave is modulated by a modulation signal of a constant frequency to the object to be measured. The present invention relates to a distance measuring device that receives a reflected wave of the radar signal reflected and returned by an object and measures a distance to an object to be measured from a phase difference between a demodulated signal of the reflected wave and the modulated signal.
【０００２】[0002]
【従来の技術】図２は従来の測距装置を示すブロック図
である。この従来の測距装置２１は、発振器３１と、送
信器３２と、受信器３３と、位相比較器３４と、ローパ
スフィルタ３５とで構成される。発振器３１は一定周波
数の変調信号１２１を出力し、送信器３２は、発振器３
１からされる変調信号１２１を受け、この変調信号１２
１で変調された送信波（レーダ信号）１３１を被測定物
体２２へ出射する。受信器３３は、レーダ信号１３１が
被測定物体２２で反射して戻ってくる反射波１３２を受
信し、変調信号１２１と同じ周波数の復調信号１２２に
変換して出力する。位相比較器３４は、発振器３１から
出力される変調信号１２１と受信器３３から出力される
復調信号１２２とを受け、変調信号１２１と復調信号１
２２との位相差を検出してこの位相差に比例する電圧信
号１２３を出力する。ローパスフィルタ３５は、位相比
較器３４から出力される電圧信号１２３を整形し、その
電圧信号１２３の電圧値から被測定物体２２までの距離
を求めていた。ここで発振器３１から出力される変調信
号１２１の周波数をｆ，被測定物体までの距離をＲ，電
磁波の速度をＣとすると、変調信号１２１と復調信号１
２２の位相差Δφは、 Δφ＝２π・（２Ｒ／Ｃ）／（１／ｆ）＝４π・（ｆ／Ｃ）・Ｒ の関係式で与えられる。上式で明らかなように位相差Δ
φが距離Ｒに比例するため、位相比較回路３４から出力
される電圧信号１２３が距離Ｒに比例することになる。2. Description of the Related Art FIG. 2 is a block diagram showing a conventional distance measuring device. The conventional distance measuring device 21 includes an oscillator 31, a transmitter 32, a receiver 33, a phase comparator 34, and a low-pass filter 35. The oscillator 31 outputs a modulation signal 121 having a constant frequency, and the transmitter 32 uses the oscillator 3
1 receives the modulated signal 121, and the modulated signal 12
The transmitted wave (radar signal) 131 modulated by 1 is emitted to the measured object 22. The receiver 33 receives the reflected wave 132 in which the radar signal 131 is reflected by the measured object 22 and returns, converts it into the demodulated signal 122 having the same frequency as the modulated signal 121, and outputs the demodulated signal 122. The phase comparator 34 receives the modulated signal 121 output from the oscillator 31 and the demodulated signal 122 output from the receiver 33, and receives the modulated signal 121 and the demodulated signal 1
The phase difference with respect to 22 is detected, and the voltage signal 123 proportional to this phase difference is output. The low-pass filter 35 shapes the voltage signal 123 output from the phase comparator 34, and obtains the distance to the measured object 22 from the voltage value of the voltage signal 123. Here, when the frequency of the modulated signal 121 output from the oscillator 31 is f, the distance to the object to be measured is R, and the velocity of the electromagnetic wave is C, the modulated signal 121 and the demodulated signal 1
The phase difference Δφ of 22 is given by the relational expression of Δφ = 2π · (2R / C) / (1 / f) = 4π · (f / C) · R. As is clear from the above equation, the phase difference Δ
Since φ is proportional to the distance R, the voltage signal 123 output from the phase comparison circuit 34 is proportional to the distance R.
【０００３】[0003]
【発明が解決しようとする課題】前述の従来の測距装置
は、発振器から出力される変調信号と受信器から出力さ
れる復調信号との位相差を位相比較器によって検出し、
この位相差に比例したアナログ信号である電圧信号で距
離の測定を行なうため、広い範囲の距離を測定するため
には上記位相比較器のダイナミックレンジが広くなけれ
ばならなかった。また、距離の測定を高精度に行なうた
めには、上記位相比較器に入力する変調信号と復調信号
のレベル変動を抑える必要があり、上記位相比較器は非
直線性が小さくかつスケールファクタの温度変化のない
ものである必要があった。The above-described conventional distance measuring device detects the phase difference between the modulated signal output from the oscillator and the demodulated signal output from the receiver by the phase comparator,
Since the distance is measured with a voltage signal which is an analog signal proportional to the phase difference, the dynamic range of the phase comparator must be wide in order to measure a wide range of distance. Further, in order to measure the distance with high accuracy, it is necessary to suppress the level fluctuations of the modulation signal and the demodulation signal input to the phase comparator, and the phase comparator has a small non-linearity and a temperature of scale factor. It had to be unchanged.
【０００４】[0004]
【課題を解決するための手段】本発明の測距装置は、搬
送波を第１の周波数の変調信号で変調したレーダ信号を
被測定物体に出射する送信手段と、前記被測定物体で反
射した前記レーダ信号を受信して前記変調信号と同じ周
波数の復調信号を生じる受信手段とを備え、前記変調信
号と前記復調信号との位相差から前記被測定物体までの
距離を測定する測距装置であって、前記第１の周波数が
電圧信号により制御される前記変調信号を生じる電圧制
御発振器と、第２の周波数のローカル信号を生じるロー
カル発振器と、前記電圧制御発振器からの前記変調信号
と前記ローカル発振器からの前記ローカル信号とに応答
して前記両信号の差周波数の基準信号を生じる第１のミ
キサーと、前記受信器からの前記復調信号と前記ローカ
ル発振器からの前記ローカル信号とに応答して前記基準
信号の周波数と同じ周波数の情報信号を生じる第２のミ
キサーと、前記第１のミキサーからの基準信号を遅延さ
せた遅延基準信号を生じる遅延線と、前記遅延基準信号
と前記情報信号に応答して前記両信号の位相差に比例し
た前記電圧信号を生じる位相比較器とを含んでいる。The distance measuring apparatus of the present invention comprises transmitting means for emitting a radar signal obtained by modulating a carrier wave with a modulation signal of a first frequency to an object to be measured, and the reflection means reflected by the object to be measured. A distance measuring device comprising: a receiving unit that receives a radar signal to generate a demodulated signal having the same frequency as the modulated signal, and that measures a distance to the object to be measured from a phase difference between the modulated signal and the demodulated signal. A voltage-controlled oscillator that produces the modulated signal whose first frequency is controlled by a voltage signal, a local oscillator that produces a local signal of a second frequency, the modulated signal from the voltage-controlled oscillator, and the local oscillator. A first mixer for generating a reference signal at a difference frequency between the two signals in response to the local signal from the receiver, the demodulated signal from the receiver and the front from the local oscillator. A second mixer for generating an information signal having the same frequency as that of the reference signal in response to a local signal; a delay line for generating a delayed reference signal by delaying the reference signal from the first mixer; and the delay A reference signal and a phase comparator responsive to the information signal for producing the voltage signal proportional to the phase difference between the two signals.
【０００５】[0005]
【実施例】次に本発明について図面を参照して説明す
る。図１は本発明の一実施例を示すブロック図である。The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
【０００６】図１の測距装置２１の電圧制御発振器１は
入力電圧１１０に対応する周波数ｆ１の変調信号１０１
を出力する。送信器２は電圧制御発振器１から出力され
る変調信号１０１を受け、この変調信号１０１で搬送波
を変調した送信波（レーダ信号）１１１を被測定物体２
２に出射する。ミキサー３は、電圧制御発振器１から出
力される変調信号１０１と、ローカル発振器９から出力
される周波数ｆ２のローカル信号１０２とを受け、変調
信号１０１とローカル信号１０２を混合してそれら２つ
の信号の周波数差（ｆ１−ｆ２）及び和（ｆ１＋ｆ２）
の周波数のビート信号１０３を出力する。ローパスフィ
ルタ４は、ミキサー３から出力されるビート信号１０３
の内、周波数（ｆ１−ｆ２）の基準信号１０４を取り出
す。遅延線５はローパスフィルタ４から出力される基準
信号１０４を受け、この信号１０４を時間Ｔｄだけ遅延
させた遅延基準信号１０５を出力する。受信器６はレー
ダ信号１１１が被測定物体２２で反射して戻ってきた反
射波１１２を受信して変調信号１０１と同じ周波数の変
調信号１０６に変換して出力する。ミキサー７は、受信
器６から出力される復調信号１０６とローカル発振器９
から出力される周波数ｆ２のローカル信号１０２とを受
け、復調信号１０６とローカル信号１０２とを混合し、
周波数がミキサー３から出力されるビート信号１０３と
同じ周波数のビート信号１０７を出力する。ローパスフ
ィルタ８はミキサー７から出力されるビート信号１０３
のうち周波数（ｆ１−ｆ２）の情報信号１０８を出力す
る。位相比較器１０は、遅延線５から出力された遅延基
準信号１０５とローパスフィルタ８から出力された情報
信号１０８とを受け、それら２つの信号１０５と１０８
の位相差を検出してこの位相差に比例した電圧信号１０
９を出力する。ループアンプ１１は、位相比較器１０か
ら出力される電圧信号１０９を受け、この信号１０９を
増幅して電圧制御発振器１に出力する。電圧制御発振器
１はループアンプ１１で増幅された電圧信号１１０を受
けて位相比較器９に入力する基準信号１０５と情報信号
１０８の位相が一致するように変調信号１０１の周波数
ｆ１を変化させる。ここで被測定物体２２までの距離を
Ｒ，電磁波の速度をＣとすると、 ２・ｆ１・Ｒ／Ｃ＝Ｔｄ・（ｆ１−ｆ２） より、 Ｒ＝Ｃ・Ｔｄ（ｆ１−ｆ２）／（２・ｆ１） となり、距離Ｒは電圧制御発振器１から出力される変調
信号１０１の周波数ｆ１と、ローカル発振器９から出力
されるローカル信号１０２の周波数ｆ２と、遅延線５の
遅延時間Ｔｄとから求めることができる。この変調信号
１０１の周波数ｆ１は電圧制御発振器１の出力端に接続
した周波数カウンタ１２によって測定し、ローカル信号
１０２の周波数ｆ２はローカル発振器９の出力端に接続
された周波数カウンタ１３によって測定する。なお、ロ
ーカル信号１０２の周波数ｆ２は通常固定しておく。ま
た、遅延線５の遅延時間Ｔｄは予め測定しておいてよ
い。The voltage controlled oscillator 1 of the distance measuring device 21 of FIG. 1 has a modulation signal 101 of a frequency f1 corresponding to an input voltage 110.
Is output. The transmitter 2 receives the modulation signal 101 output from the voltage controlled oscillator 1, and transmits a transmission wave (radar signal) 111 whose carrier wave is modulated by the modulation signal 101 to the measured object 2
Emit to 2. The mixer 3 receives the modulation signal 101 output from the voltage controlled oscillator 1 and the local signal 102 of the frequency f2 output from the local oscillator 9, mixes the modulation signal 101 and the local signal 102, and mixes the two signals. Frequency difference (f1-f2) and sum (f1 + f2)
The beat signal 103 having the frequency of is output. The low-pass filter 4 outputs the beat signal 103 output from the mixer 3.
Among them, the reference signal 104 of the frequency (f1-f2) is taken out. The delay line 5 receives the reference signal 104 output from the low-pass filter 4, and outputs the delayed reference signal 105 obtained by delaying the signal 104 by the time Td. The receiver 6 receives the reflected wave 112 in which the radar signal 111 is reflected by the object 22 to be measured and returned, converts the reflected wave 112 into a modulated signal 106 having the same frequency as the modulated signal 101, and outputs the modulated signal 106. The mixer 7 includes a demodulated signal 106 output from the receiver 6 and a local oscillator 9
Receiving the local signal 102 of the frequency f2 output from and mixing the demodulated signal 106 and the local signal 102,
A beat signal 107 having the same frequency as the beat signal 103 output from the mixer 3 is output. The low-pass filter 8 is a beat signal 103 output from the mixer 7.
The information signal 108 of the frequency (f1-f2) is output. The phase comparator 10 receives the delayed reference signal 105 output from the delay line 5 and the information signal 108 output from the low pass filter 8, and receives these two signals 105 and 108.
Of the voltage signal 10 proportional to this phase difference is detected.
9 is output. The loop amplifier 11 receives the voltage signal 109 output from the phase comparator 10, amplifies this signal 109, and outputs it to the voltage controlled oscillator 1. The voltage controlled oscillator 1 receives the voltage signal 110 amplified by the loop amplifier 11 and changes the frequency f1 of the modulation signal 101 so that the phases of the reference signal 105 and the information signal 108 input to the phase comparator 9 match. Assuming that the distance to the object 22 to be measured is R and the velocity of the electromagnetic wave is C, 2 = f1 * R / C = Td * (f1-f2), R = C * Td (f1-f2) / (2 F1), and the distance R is obtained from the frequency f1 of the modulation signal 101 output from the voltage controlled oscillator 1, the frequency f2 of the local signal 102 output from the local oscillator 9, and the delay time Td of the delay line 5. You can The frequency f1 of the modulated signal 101 is measured by the frequency counter 12 connected to the output terminal of the voltage controlled oscillator 1, and the frequency f2 of the local signal 102 is measured by the frequency counter 13 connected to the output terminal of the local oscillator 9. The frequency f2 of the local signal 102 is usually fixed. Further, the delay time Td of the delay line 5 may be measured in advance.
【０００７】上述したように本実施例は、位相比較器１
０へ入力される２つの信号、即ち遅延基準信号１０５と
情報信号１０８の位相が常に等しくなるように制御する
零位相法であるため、位相比較器１０に広い直線性を必
要とせず、また位相比較器１０への入力信号のレベル変
動に影響されにくい。従って、被測定物体２２までの距
離Ｒは電圧制御発振器１から出力される変調信号１０１
とローカル発振器９から出力される信号１０２のそれぞ
れの周波数ｆ１，ｆ２の測定によって（遅延時間Ｔｄは
通常固定されている）簡単に求めることができる。As described above, this embodiment uses the phase comparator 1
Since the zero phase method is used to control the two signals input to 0, that is, the delay reference signal 105 and the information signal 108 to always have the same phase, the phase comparator 10 does not require wide linearity, and It is unlikely to be affected by the level fluctuation of the input signal to the comparator 10. Therefore, the distance R to the object 22 to be measured is determined by the modulation signal 101 output from the voltage controlled oscillator 1.
And the respective frequencies f1 and f2 of the signal 102 output from the local oscillator 9 can be easily obtained (the delay time Td is usually fixed).
【０００８】[0008]
【発明の効果】以上詳しく説明したように本発明は、送
信器から受信器まて伝搬する間に生じる送信信号と復調
信号との間の位相差をなくする零位相法を距離の測定法
として用いているため、この位相差を検出する位相比較
器に広い直線性を必要とせず、また、位相比較器に入力
する信号にレベル変動があっても高精度の距離測定がで
きる。さらに、測定距離は電圧制御発振器およびローカ
ル発振器の信号周波数の測定から簡単に求めることがで
きるという効果がある。As described in detail above, according to the present invention, the zero phase method for eliminating the phase difference between the transmission signal and the demodulation signal generated during the propagation from the transmitter to the receiver is used as the distance measuring method. Since this is used, the phase comparator that detects this phase difference does not require wide linearity, and highly accurate distance measurement can be performed even if the signal input to the phase comparator has level fluctuations. Further, the measuring distance can be easily obtained by measuring the signal frequencies of the voltage controlled oscillator and the local oscillator.
【図１】本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of the present invention.
【図２】従来の距離測定装置を示すブロック図である。FIG. 2 is a block diagram showing a conventional distance measuring device.
１ 電圧制御発振器 ２ 送信器 ３ ミキサー ４ ローパスフィルタ ５ 遅延線 ６ 受信器 ７ ミキサー ８ ローパスフィルタ ９ ローカル発振器 １０ 位相比較器 １１ ループアンプ １２，１３ 周波数カウンタ ２１ 測距装置 ２２ 被測定物体 ３１ 発振器 ３２ 送信器 ３３ 受信器 ３４ 位相比較器 ３５ ローパスフィルタ １０１ 変調信号 １０２ ローカル信号 １０３ ビート信号 １０４ 基準信号 １０５ 遅延基準信号 １０６ 復調信号 １０７ ビート信号 １０８ 情報信号 １１１ 送信波（レーダ信号） １１２ 反射波 １２１ 変調信号 １２２ 復調信号 １２３ 電圧信号 １３１ 送信波（レーダ信号） １３２ 反射波 1 Voltage Controlled Oscillator 2 Transmitter 3 Mixer 4 Low Pass Filter 5 Delay Line 6 Receiver 7 Mixer 8 Low Pass Filter 9 Local Oscillator 10 Phase Comparator 11 Loop Amplifier 12, 13 Frequency Counter 21 Range Finder 22 Measured Object 31 Oscillator 32 Transmit Device 33 Receiver 34 Phase comparator 35 Low-pass filter 101 Modulated signal 102 Local signal 103 Beat signal 104 Reference signal 105 Delayed reference signal 106 Demodulated signal 107 Beat signal 108 Information signal 111 Transmitted wave (radar signal) 112 Reflected wave 121 Modulated signal 122 Demodulated signal 123 Voltage signal 131 Transmitted wave (radar signal) 132 Reflected wave
Claims (3)
を被測定物体に出射する送信手段と、前記被測定物体で
反射した前記レーダ信号を受信して前記変調信号と同じ
周波数の復調信号を生じる受信手段とを備え、前記変調
信号と前記復調信号との位相差から前記被測定物体まで
の距離を測定する測距装置であって、前記変調信号と前
記復調信号に応答して両者の位相差に比例した電圧信号
を生じる位相比較手段と、前記電圧信号に応答して前記
変調信号と前記復調信号の位相差を一致させるように周
波数を制御した前記変調信号を生じる電圧制御発振手段
とを備えることを特徴とする測距装置。1. Transmitting means for emitting a radar signal obtained by modulating a carrier wave with a modulation signal to an object to be measured, and receiving the radar signal reflected by the object to be measured to generate a demodulation signal having the same frequency as the modulated signal. A distance measuring device comprising a receiving means and measuring a distance to the object to be measured from a phase difference between the modulated signal and the demodulated signal, wherein a phase difference between the modulated signal and the demodulated signal in response to the measured signal. And a voltage control oscillator for generating the modulated signal whose frequency is controlled so as to match the phase difference between the modulated signal and the demodulated signal in response to the voltage signal. A distance measuring device characterized in that
周波数を測定する手段を含むことを特徴とする請求項１
記載の測距装置。2. The distance measuring device further includes means for measuring the frequency of the modulated signal.
The described distance measuring device.
したレーダ信号を被測定物体に出射する送信手段と、前
記被測定物体で反射した前記レーダ信号を受信して前記
変調信号と同じ周波数の復調信号を生じる受信手段とを
備え、前記変調信号と前記復調信号との位相差から前記
被測定物体までの距離を測定する測距装置であって、前
記第１の周波数が電圧信号により制御される前記変調信
号を生じる電圧制御発振器と、第２の周波数のローカル
信号を生じるローカル発振器と、前記電圧制御発振器か
らの前記変調信号と前記ローカル発振器からの前記ロー
カル信号とに応答して前記両信号の差周波数の基準信号
を生じる第１のミキサーと、前記受信器からの前記復調
信号と前記ローカル発振器からの前記ローカル信号とに
応答して前記基準信号の周波数と同じ周波数の情報信号
を生じる第２のミキサーと、前記第１のミキサーからの
基準信号を遅延させた遅延基準信号を生じる遅延線と、
前記遅延基準信号と前記情報信号に応答して前記両信号
の位相差に比例した前記電圧信号を生じる位相比較器と
を含むことを特徴とする測距装置。3. Transmitting means for emitting a radar signal obtained by modulating a carrier wave with a modulation signal of a first frequency to an object to be measured, and receiving the radar signal reflected by the object to be measured to have the same frequency as the modulated signal. And a receiving means for generating a demodulated signal, the distance measuring device measuring a distance to the object to be measured from a phase difference between the modulated signal and the demodulated signal, wherein the first frequency is controlled by a voltage signal. A voltage-controlled oscillator that produces the modulated signal, a local oscillator that produces a local signal of a second frequency, and both in response to the modulation signal from the voltage-controlled oscillator and the local signal from the local oscillator. A first mixer for generating a reference signal at a signal difference frequency; and the reference signal in response to the demodulated signal from the receiver and the local signal from the local oscillator. A second mixer for generating an information signal having the same frequency as that of the signal, and a delay line for generating a delayed reference signal by delaying the reference signal from the first mixer;
A distance measuring device, comprising: a phase comparator that generates the voltage signal proportional to the phase difference between the delayed reference signal and the information signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31953391A JPH05203732A (en) | 1991-12-04 | 1991-12-04 | Range finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31953391A JPH05203732A (en) | 1991-12-04 | 1991-12-04 | Range finder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05203732A true JPH05203732A (en) | 1993-08-10 |
Family
ID=18111308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31953391A Withdrawn JPH05203732A (en) | 1991-12-04 | 1991-12-04 | Range finder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05203732A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007248245A (en) * | 2006-03-15 | 2007-09-27 | Institute Of National Colleges Of Technology Japan | Radio wave type displacement measuring device |
| JP2011130174A (en) * | 2009-12-17 | 2011-06-30 | Fujitsu Ltd | Communication device |
| WO2019146055A1 (en) * | 2018-01-25 | 2019-08-01 | 日本電気株式会社 | Object discrimination device, object discrimination method, and object discrimination program |
| JP2021063783A (en) * | 2019-10-17 | 2021-04-22 | Ｎｅｃネットワーク・センサ株式会社 | Distance measuring device and distance measuring method |
-
1991
- 1991-12-04 JP JP31953391A patent/JPH05203732A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007248245A (en) * | 2006-03-15 | 2007-09-27 | Institute Of National Colleges Of Technology Japan | Radio wave type displacement measuring device |
| JP2011130174A (en) * | 2009-12-17 | 2011-06-30 | Fujitsu Ltd | Communication device |
| WO2019146055A1 (en) * | 2018-01-25 | 2019-08-01 | 日本電気株式会社 | Object discrimination device, object discrimination method, and object discrimination program |
| JPWO2019146055A1 (en) * | 2018-01-25 | 2021-01-14 | 日本電気株式会社 | Object identification device, object identification method and object identification program |
| US11733350B2 (en) | 2018-01-25 | 2023-08-22 | Nec Corporation | Object identification apparatus, object identification method, and object identification program |
| JP2021063783A (en) * | 2019-10-17 | 2021-04-22 | Ｎｅｃネットワーク・センサ株式会社 | Distance measuring device and distance measuring method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5162862A (en) | Lightspeed-related measurement apparatus | |
| US6100540A (en) | Laser displacement measurement system | |
| US4238795A (en) | Microwave range measuring system for measuring the distance of an object | |
| US4008475A (en) | Stabilizing and calibration circuit for FM-CW radar ranging systems | |
| EP0348900A2 (en) | Delay time measuring device | |
| KR101239166B1 (en) | Frequency modulated continuous wave proximity sensor | |
| JPS59157581A (en) | Fm/cw radar device | |
| JP2604075B2 (en) | FM radar | |
| GB1483236A (en) | Device for indicating changes in the position of an object | |
| JPH05203732A (en) | Range finder | |
| JPH0452586A (en) | Distance measuring apparatus | |
| US3790940A (en) | Communication apparatus having a ranging capability | |
| US2931030A (en) | Radar system | |
| JP2623931B2 (en) | Phase-synchronized transceiver | |
| JP2762143B2 (en) | Intermittent FM-CW radar device | |
| JP3930376B2 (en) | FMCW radar equipment | |
| JPH0318784A (en) | Fm-cw distance measuring method | |
| JPH06289129A (en) | Distance measuring device | |
| JPH03158785A (en) | Range finder | |
| US3126540A (en) | Mixer | |
| JP2584482B2 (en) | Speed measuring device built into data transmission equipment | |
| JP2930740B2 (en) | Servo slope type FM-CW radar | |
| JPH04315979A (en) | Method and device for mesuring distance using microwave | |
| JPH09211112A (en) | Fm-cw radar | |
| JPH01138480A (en) | Short-range radar sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990311 |