SU551687A1 - Device for transmitting telemetric information - Google Patents

Description

(54) DEVICE FOR TRANSMITTING TELEMATORY INFORMATION

The device relates to the field of telemetry and can be used in telemechanics, radio telemetry, long distance communication, etc.

Radio telemetry systems (PTCs) used to obtain measurement data from remote or mobile objects have recently become more and more widespread in many branches of science and technology; PTC is a specialized communication system in which the measured value on the transmitting side is converted into an electrical signal, transmitted over a radio link (communication channel) to the receiving side and recorded there. Recently, in connection with an ever-increasing flow of data requiring RTS transfer and processing by the crawler on the one hand, and considerable flow redundancy on the other, RTS has developed with reduced redundancy of the transmitted data — with data compression before transmitting it through the communication channel containing sensors, transducers, chromisers, redundancy reduction unit 111. PTCs with data compression are adaptive

pe relative to the i.kho / | nymi signals, i.e. automatically changing the work program depending on the nature of the change in time of the measured values.

The most developed at present are the PTCs that use reversible compression methods, i.e. those that make it possible to restore the form of the measured magnitude as a function of time, and of the reversible, polynomial compression methods are most commonly used, based; a fragmentary approximation of the measurable quantity, which is a function of time. Adaptive sampling and adaptive switching can be used to implement polynomial methods. The algorithm of systems with adaptive switching is widely known. A characteristic feature of such systems is the addressing of each sample, i.e. transfer along with the measurement information also service information (address, i.e. the simplified channel number).

It is known a device for transmitting telemetric information, comprising sensors, the output of each of which is connected to the first inputs of the corresponding agroximation transducer and the key element, the second outputs of the same {pi.1X approximation error converters and key elements are combined

and connected to the control outputs anaJteautopa errors, the outputs of the approximation error converters are connected to the information inputs of the error analyzer, the output of the pulse generator under the keys to the distributor input, the control output KOTOpofo is connected to the corresponding inputs of the error analyzer and the synchronizer's block, which is connected to the first one, which is connected to the first one, which is connected to the first one. 2}.

However, sequential transmission of the information code and address code leads to a significant reduction in the efficiency of adaptive switching. The transfer of all information is carried out by digital methods, which require significantly more energy than the analog ones for a given communication channel. In addition, the device is characterized by the complexity of the hardware implementation (availability of the e-ADC).

In order to increase the efficiency of the device, an analog modulator and OR and AND elements are entered into it, one inputs of which are connected to the corresponding outputs of the distributor, others are connected to the address outputs of the error analyzer, outputs of elements AND via the OR element connected to the first input of the analog modulator second input which is connected to the outputs of the key elements, the output of the analog modulator is subalized, to the second input of the transmitter.

The drawing shows a block diagram of the device.

The device contains sensors 1 for converting information from an oblique into an electrical signal, for example, a DC voltage, converters 2 approximation errors for generating a signal (1gr) proportional to the approximation error according to the selected algorithm, key elements 3 used for transmission sensor signals to the input of an analog modulator 4, which, in turn, is used to convert analog signals into pairs determined by the modulator construction method an impr (pulse amplitude, pulse width, pulse frequency, time interval between adjacent pulses, etc.) at each clock interval, error analyzer 5, And 6, distributor 7, synchronization unit 8, transmitter 9, pulse generator 10 and Element OR 11.

The device works in the following way. The signals from sensors 1 are adaptively switched. In this case, each converter 2 approximation error at its output generates a signal proportional to the current value of the approximation error of the input signal by a certain polynomial. The error analyzer 5 according to the signal from the output of the pulse distributor 7 selects the approximation error converter and, accordingly, the channel with the maximum approximation error value and connects the output signal of the selected channel (sensor 1) through key element 3 to the input of the analog modulator 4. At the same time, the analyzer 5 performs reset to the zero state of the output signal of the selected converter 2 and generates on the outputs connected to the inputs of the elements 6, the parallel code of the number of the selected transducer azovatel 2 (channel). At the outputs of the pulse distributor 7, connected to the inputs of the And 6 elements, signals appear successively. At that, if at the output of the analyzer 5, connected to the input of the AND 6 element and corresponding to a certain bit of the address code, the signal 1 takes place. At the output of the AND 6 element, when a signal comes from the output of the distributor 7, a signal is generated, which through the OR 11 element goes to the control The input of the analog modulator 4. According to this signal, the analog modulator 4 performs, in accordance with the information signal received through the open key element 3, the modulation of the corresponding parameter of the carrier signal. From the output of the analog modulator 4, signals go to transmitter 9, and from the output of the latter to the communication channel. As a result of the serial transmission of signals to the inputs of elements 6 and 6 from the output of the distributor 7, the parallel address code of the polled sensor in the sensor cycle is converted into a serial one, and if there is a unit in the corresponding bit, the information on the output signal is transmitted to the communication channel during this cycle. the signal of the polled: sensor, and if there is some CONDITIONAL analog signal, or nothing is transmitted. After transmitting in this way a serial address code and information about the output signal of the sensor being polled, the error analyzer 5 responds to the signal from the output of the distributor 7 again in the above manner and the cycle repeats.

Claims (2)

The beginning of the transfer of directly measuring information is preceded by the transfer of synchronizing parcels generated by the synchronization unit 8 at the beginning of each transmission cycle. Thus, in the proposed device, code combinations that carry information about the number of the polled sensor are transmitted to the communication channel, and each code unit carries in analog form information about the output signal of the polled sensor. This makes it possible to reduce both the cycle time of adaptive switching and the amount of energy expended in transmission. In addition, the use of the proposed transmitting device allows the system to increase the system’s immunity by increasing the reliability of the repeated transmission of information about the output signal of the sensor being polled (for l-bit address code, on average, each combination can contain n / 2 units, i.e. the signal in fedm is repeated n / 2 times). The formula of the invention apparatus for transmitting telemetric informashga comprising a detector, the output of each of which is connected to the first inputs of the respective converter approximation error and key zlemeita, second outputs odaoimennyh converters error approximations and the key elements are coupled and connected to the control yushim outputs analyzer errors converters outputs approximation error connected to the information inputs of the error analyzer, the output of hepapajpa pulses n It is connected to the input of the distributor, the control output of which is connected to the corresponding inputs of the error analyzer and the synchronization unit, the output of which is connected to the first input of the transmitter, which is so that, in order to increase the efficiency of the device, an analog modulator and elements are introduced into it OR and AND, some of which are connected to the corresponding outputs of the distributor, others. - connected to the address outputs of the error analyzer, the outputs of the elements AND through the element OR connected to the first input of the analog modulator, the second input of which is connected to the outputs of the key elements, the output of the analog modulator connected to the second input of the transmitter. Sources of information taken into account during the examination: 1. AraAikuHqiB P.L.- Fundamentals of radio-telemetry, M., Voenhiz 1971 ,. 16Z-164. 2. Fremke A.V. Telemeasurements, N., Higher, 1975, p. 23G (njWTOTim).