JPH0970083A - Transmitter-receiver for telemeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive measurement data of an unattended transmitter and to initialize and revise an instrument and a sensor from a remote location by allowing a receiver side to make 2-way data transmission by the spread spectrum communication system. SOLUTION: Sensor measurement data are digitized by preamplifiers 4a -4n and an ADC 5 via input terminals T1 -Tn and fed to a data processing circuit 14, transmission data are obtained thereat and given to a mixer 17 with a PN signal and given to a next mixer 19 as a spread spectrum signal. The signal is multiplied by a carrier and sent to a receiver from a transmission amplifier 21 and a transmission antenna 7. When the receiver conducts setting and revision of measurement instruments sensors of the transmitter, command data from a receiver key board are received via the antenna 7 and a CPU 15 adjusts a level of the preamplifier of each measurement instrument via the data processing circuit 14. Thus, the receiver side obtains the measurement data and the setting and revision of the measurement instruments and sensors of the transmitter are easily conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter / receiver device for a telemeter, which wirelessly telemeters various kinds of measurement data, and more particularly, it transmits data using a spread spectrum method and sets or changes transmission data. The present invention relates to a transmitting / receiving device for a telemeter, which can be performed on the receiving device side.

[0002]

2. Description of the Related Art Conventionally, as a small power transmitter / receiver for wireless use without permission of the Radio Law, various kinds of telemeter transmitter / receiver 1 for telemetering analog measurement data in a mobile body such as a vehicle to a predetermined position have been used. Although a transceiver is proposed, a transceiver for PCM (Pulse Code Modulation) telemeter measurement is used, for example.

This PCM system is capable of multi-channel data transmission with one wave as compared with the FM modulation / demodulation system.
It is configured like.

In FIG. 4, for example, analog data for measurement in a vehicle or the like is detected by a strain sensor, a pressure sensor, an acceleration sensor, a tachometer, a temperature sensor, a voltage sensor, etc., and output signals are input to the input terminals T _{1 to} T _n. .

The outputs of the input terminals T _{1 to} T _n are supplied to the preamplifiers 4a, 4b, 4c, 4d, 4e ... 4n, respectively, and are pre-amplified. The rotation speed from the tachometer or the like is supplied to the preamplifier 4d via a frequency-voltage conversion circuit (not shown).
Is supplied to. The outputs of the plurality of preamplifiers 4a to 4n are commonly connected and are connected to an analog-digital conversion circuit (AD).
C) is supplied to 5 and converted into digital data to be PCM
The transmitter 2 is configured so as to be PCM by the PCM transmitting circuit 6 that constitutes the telemeter transmitting unit and wirelessly transmit data via the transmitting antenna 7.

On the side of the receiving device 3, the receiving antenna 8 receives the signal.
Configured PCM telemeter unit with PCM received signal
Channels for each sensor received by the PCM receiving circuit 9
Demodulation circuit 10 demodulates the digital data and then digital-analog
Log conversion circuit (DAC) 11 converts to analog signal
Output terminal T₁~ T_{n + 1}Output to Output terminal T₁~ T
_{n + 1}Various oscillographs, data processing devices, data records
A coder, etc. is connected.

Such a telemeter transmitting / receiving apparatus 1 is often configured to perform only one-way transmission from the transmitting apparatus 2 side to the receiving apparatus 3 side.

[0008]

SUMMARY OF THE INVENTION In the above-described conventional transmitter / receiver for a telemeter, the initial condition of analog data to be measured when the transmitter having the measurement sensor is installed at a remote place, calibration, Preamplifier range setting, ADC5 sampling speed setting, etc.
These values must be adjusted on the receiving device 3 side depending on the measurement conditions, but the above-mentioned adjustment cannot be made on the receiving device side because of one-way transmission.

The present invention has been made in order to solve the above-mentioned problems. The problem is that bidirectional communication can be exchanged at low cost by using a spread spectrum modulated signal, and the receiver side. It is an object of the present invention to provide a transmitting / receiving device for a telemeter in which data can be easily transmitted to the transmitting device side and initial setting of sensors and various circuits provided in the transmitting device side can be changed from the receiving device side.

[0010]

As shown in FIGS. 1 and 2, a transmitter / receiver for a telemeter according to the present invention has a microcomputer 15 for processing a plurality of data to be telemetered and the plurality of data. Is transmitted as a spread spectrum modulated signal by radio, a microcomputer 30 for processing a plurality of data telemetered by the transmitting means 2, and a receiving means 3 for receiving and demodulating the plurality of spread spectrum transmitted signals. And the setting and change of a plurality of telemetered data on the transmitting means 2 side are automatically adjusted by using the bidirectional transmission function on the receiving means side.

According to such a transmitter / receiver for a telemeter, it is possible to easily perform the initial setting and calibration of the instruments and various circuits and sensors of the unmanned transmitter for measurement in a remote place from the receiving side. To be

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a transmitting / receiving device for a telemeter according to the present invention will be described below with reference to FIGS. The parts corresponding to those in FIG. 4 are designated by the same reference numerals, and duplicate description will be omitted.

FIG. 1 is a system diagram of a telemeter transmitter of this example, and FIG. 2 is a system diagram of a telemeter receiver of this example.

In FIG. 1, strain sensors are connected to the input terminals T _{1 to} T _n ,
Pressure sensor, acceleration sensor, tachometer, temperature sensor,
Measurement data to be telemetered from a voltage sensor or the like is input and is input in parallel to the preamplifiers 4a to 4n, and the outputs of these preamplifiers 4a to 4n are commonly connected to AD.
Supplied to C5. The measured analog data is converted into digital data by the ADC 5 and supplied to the data processing circuit 14. In the data processing circuit 14, transmission data is formed under the control of a microcomputer (hereinafter referred to as CPU) 15 and also control data for controlling the preamplifiers 4a to 4n.

The transmission data from the data processing circuit 14 is supplied to the first mixer 17 and at the same time PN (Pseudo Nois).
e) A PN signal from a pseudo code generator 18 such as a code generator is also supplied to the first mixer 17 for multiplication, and a spread spectrum signal (hereinafter referred to as SS signal) is supplied to the second mixer 19 Is output to.

The second mixer 19 has a carrier oscillator (OS).
C) A carrier wave is supplied from 20 and multiplied, and the SS signal is converted into a transmission signal and is transmitted through a transmission amplifier 21 to a transmission antenna 7
To transmit an SS signal.

The CPU 15 has an operation unit 16 such as keys,
The control signal of the CPU 15 is AD in addition to the data processing circuit 14.
It is also supplied to C5, the first and second mixers 17 and 19, and various controls are performed.

On the other hand, the receiving device 3 side is constructed as shown in FIG. That is, the reception signal received by the reception antenna 8 is supplied to the third mixer 31. The carrier wave is supplied from the carrier wave oscillator 23 to the third mixer 31, is multiplied by the received signal, is amplified by the reception amplifier 22, and is supplied to the fourth mixer 26 as the SS signal.

Further, the SS signal from the receiving amplifier 22 is supplied to the synchronous detection circuit 24, the synchronous detection signal is detected, and the PN code generator 25 outputs the synchronously generated PN signal based on the synchronous detection signal. , In the fourth mixer 26 S
The S signal is multiplied and despreading of the spectrum is performed to extract the received data, and the data processing circuit 27 and the DAC
The measurement data that has been converted into an analog signal via 11 is output to output terminals T _{6 to} T _{n + 1} and output to an oscillograph, a data processing device, a data recorder, and the like.

The CPU 30 controls the third and fourth mixers 31 and 26, the data processing circuit 27, and the DAC 11. Further, the CPU 30 has an operation unit 28 such as keys and a display unit 29 such as a CRT or a liquid crystal, and in the operation unit 28, the output level setting of the sensor on the transmitter 2 side, the first stage balance of various circuits such as preamplifier, calibration, Range setting, A
Instructing to set or change the sampling speed of DC5,
The display unit 29 is configured to display data values of these settings, changes, calibrations and the like.

The operation of the above configuration will be described with reference to FIG. In FIG. 3, reference numeral 45 denotes a display screen of the display unit 29 such as a CRT on the receiving device 3 side, and the measurement data transmitted from the transmitting device 2 side is displayed on the display screen 45 of FIG. 3 on channels CH1 to CH16. Are displayed as well as items such as ranges and filters corresponding to the respective channels CH1 to CH16, the cursor key of the operation unit 28 or the like is used to calibrate, set or change the channel for which the cursor 46 is desired. The channel CH16 of the input terminal is designated by bringing it to the position, for example, the range position of the channel CH16. Since data transmission by the SS communication method is performed by the packet method, the calibration, setting, and changing operations are performed at the time when the measurement data is not telemetered from the transmitting device 2 side.

That is, the key group of the operation unit 28 of the CPU 30 on the side of the receiving device 3 is operated to set the initial setting level of the channel CH16 to a predetermined value. In FIGS. 1 and 2, the RF unit shows only the transmitting and receiving devices, but FIGS. 1 and 2 of this part together constitute an RF transmitting / receiving circuit. Therefore, the transmission signal received by the transmission / reception antenna 7 via the reception antenna 8 is also stored in the storage means (not shown) of the CPU 15 in the transmission device 2 when the reception device side performs the transmission operation, and the CPU 15 causes the data processing circuit 14 to operate. By controlling, the level of the preamplifier of the channel CH16 is adjusted to a predetermined value via the data processing circuit 14.

That is, from the receiving device 3 side, various item controls such as initial balance, calibration, range setting or ADC sampling rate setting change of the various measuring preamplifiers 4a to 4n mounted on the transmitting device side are performed. Since it can be easily performed by specifying, a small electric power (1) which is extremely effective when applied to an unmanned telemeter placed in a remote place (1
(0 mmw / MHz), it is possible to obtain a telemeter transmitter / receiver that can be inexpensively configured by a spread spectrum communication method that is not permitted by the Radio Law and has high interference resistance and confidentiality.

It is not necessary for the receiving device to correspond one-to-one with the measuring means for measurement shown as the transmitting device, and it is possible to measure and monitor the measuring means with one receiving device. Of course.

[0025]

According to the transmitter / receiver for a telemeter of the present invention, the setting, calibration and change of the measurement data of a plurality of transmitters for measurement are inexpensively performed by using the spread spectrum communication system based on the command from the receiver. Can be configured.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a transmitter for a telemeter according to the present invention.

FIG. 2 is a system diagram showing an embodiment of a telemeter receiver of the present invention.

FIG. 3 is an explanatory view of a display screen of a display unit of the receiving device for telemeter of the present invention.

FIG. 4 is a system diagram of a conventional transmitter / receiver for a telemeter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter / receiver for telemeter 2 Transmitter 3 Receiver 4a-4n Preamplifier 14,27 Data processing circuit 15,30 CPU 17,19,31,26 1st-4th mixer

Claims (1)

[Claims] 1. A microcomputer for processing a plurality of data to be telemetered, a transmitting means for wirelessly transmitting the plurality of data as a spread spectrum modulated signal, and a microcomputer for processing a plurality of data telemed by the transmitting means. A computer and receiving means for receiving and demodulating the plurality of spread spectrum transmission signals, and setting a plurality of telemetered data on the transmitting means side;
A transmission / reception device for a telemeter, characterized in that the change is automatically adjusted by using the bidirectional transmission function on the receiving means side.