SU698034A1 - Remote measurement apparatus - Google Patents

Description

I

This invention relates to telemechanics.

Telemetry devices are known that contain sensors, matching blocks, switches, a calibration voltage sensor, a modulator, an IJS element, a chronizer, a clock signal coder, a transmitter, a receiver, demodulators, a recording unit, a time stamp block, a selection and shaping unit (a signal. The drawbacks of the devices are the impossibility of transmitting the signal in the opposite direction and the comparatively low accuracy.

The telemetering device, which is most closely related to the technical review, contains sensors whose outputs are connected to the switch inputs, the output of which is connected to the signal analyzer through a coding unit and a direct communication channel, the first analyzer output is connected to the memory block input, The second output of the signal analyzer is connected to the control input of the memory unit and the input of the signal conditioner, the output of which is connected to the receiver input through a reverse communication channel, which code is a clock coupled

With a clock input switch. In the signal analyzer, so-called unreliable symbols are detected, which can be carried out, in particular, by a threshold method that analyzes the ratio of the signal element energy to the specific power of the fluctuation disturbance Ssc and if this ratio exceeds

threshold R

1 / r

C11

then the received signal element is deemed reliable, otherwise unreliable 2.

The drawback of the device is the time delays arising from the repetition of unreliable symbols, which lead to an increase in the approximation error, as well as to a decrease in the device capacity. In this case, an unacceptable amount of approximation error may occur in the most important priority channels.

The purpose of the invention is to improve the accuracy of the device.

This goal is achieved by the fact that a code comparison block is entered into the device, the reverse i counters are elements whose inputs {are combined and connected respectively to the output of the clock generator m to the output of the receiver, the outputs of elements AND are connected to the inputs of the reversible counter whose outputs are connected to the first group B1 of the unit cc unecc codes, the group of outputs of the switch is connected to the second round input of the comparison block whose output is connected to the control input of the switch.

The drawing shows a block diagram of the proposed device.

The device contains Ij-Hz sensors, switch 2, coding unit 3, forward link 4, signal analyzer 5, decoding unit 6, clock generator, memory block 8, block comparison codes 9, element Yu, receiver 11, reverse channel connection 12, the signal conditioner 13, the reversible counter 14, element And 15.

The device works as follows.

All n sensors 1 are arranged in order of their priority. If in the forward link 4 there are no distortions of the transmitted symbols (or these distortions are not more than permissible), then condition (1) is fulfilled and co-mode 2 will alternately connect all available sensors li-1c, since the reverse link 12 transmits signal O, and at the output of the code comparison block 9 there is signal 1 until the sensor with the lowest priority is connected. If condition (1) is violated, then at the receiving side the received signal will not be recorded in the memory block 8 and a reverse signal G will be sent on the reverse communication channel 12, which closes the element 15 and opens the element 10 to pass a pulse from the generator clock pulses 7, i.e. At the output of the reversing counter 14, the code (n - 1) t "switch 2 will not connect the last sensor to the input of coding block 3 (to transfer), because from (n - 1) switch 2 will immediately be switched to the initial state the At each subsequent transmission cycle, one of the sensors li-I will be excluded (connected) if condition (1) is not satisfied (fulfilled). Thus, in conditions of poor permeability of signals on the forward link 4, the system performs excessive transmission on priority channels, thereby improving the accuracy of telemetry.

For real telemetry objects, the number of priority channels is 10-20% of the total number of channels, therefore, the proposed device allows to increase the accuracy in priority channels by 5-10 times for the time of strong interference on the communication line.

Claims (2)

1. Barsukov F. I. et al. Elements and devices of the RTS. M., 1973, p. 17 2.Klovsky D.D. Theory of Signal Transmission M., 1973, p. 360-362 (prototype).