SU516088A1 - Transmitting radio telemetry device - Google Patents

Description

The device relates to the field of information-measuring equipment and can be used in telemetry and in adjacent areas of technology.

Radio telemetry systems for transmitting information are known that contain in each channel a sensor connected to one input of a measuring switch. Outputs of all measurement keys are connected to the first modulator input, the second input of which is combined with the input of the pulse distributor and the input of the clock encoder, the output of the encoder of the clock signals to one input of the first OR element, the second input of which is connected to the output of the modulator, and the output with the input radio transmitter.

However, such devices have low noise immunity of signals in the radio channel, since the parameters of these signals must be selected in accordance with the maximum dynamics of the output signals.

The purpose of the invention is to improve the noise immunity of signal transmission.

This is achieved by adaptive temporal samplers being introduced into the device. And elements, OR element, low-pass filters and a voltage-to-frequency converter. In each channel, the sensor output is connected to the first input of the adaptive time sampler, the output of which is connected2

with the first input of the element I, the output of the element I-to the other inputs of the measuring key and the adaptive time sampler, the outputs of all adaptive time samplers to the corresponding inputs of the second OR element connected via serially connected first low-pass filter and a voltage-to-frequency converter the point of connection of the inputs of the modulator, clock coder and distributor. The outputs of the latter are connected to the second input of the AND element of each channel, the output of the first element OR through the second low-pass filter to the second

radio transmitter input.

The block diagram of the device shown in the drawing.

It contains sensors L measuring keys 2, adaptive time samplers 3, elements AND 4, modulator 5, distributor 6, element OR 7, encoder 8 sync signals, low-pass filter 9, radio transmitter 10, element OR 11, low pass filter 12, converter 13 voltage in

frequency

Sensors 1 are designed to convert the values of telemetry parameters to changes in unqualified signals. One of the sensors can be a control for

transmitting a certain signal, for example, corresponding to 100% of the scale. Measuring switches 2 are used to alternately connect the signals of sensors 1 to a modulator 5, which converts them into signals of a particular type of pulse modulation (PIM, VIM, PWM, or CMM). The connection of one or another sensor is carried out using the distributor 6, the elements 4 and the sampler 3. The element 4 has a single output signal in the case when both signals from the distributor 6 and the sampler 3 come to both of its outputs. sensor signals I and generates a single signal at its output if the error of approximation of the input signal exceeds the permissible one. When the corresponding sensor 1 is connected to the modulator 5, the output of the element 4 does not reset the sampler 3 to the zero state. The clock encoder 8 generates the signals necessary to distinguish signals from different sensors on the receiving side. The sync signals along with the signal of the modulator 5 through the element OR 7 arrive at the input of the radio transmitter 10, which radiates the signals to the radio. The output peak power of the radio transmitter may vary depending on the signal input to the control input: the smaller the control signal, the greater the peak output power of the radio transmitter. In order for the average radiation power to not exceed the value determined by the allowable energy consumption from the power source or the allowable overheating of the radio transmitter, it is necessary to reduce the average emission time of the radio transmitter when its output peak power is increased. A signal proportional to the average time of a radio transmitter emitter is generated using filter 9. Element OR 11 has a single signal at the output if any of the samplers 3 is triggered. The average value of the signal at the output of the element OR I1 increases with increasing activity of the input signals, as this increases waiting for polling in the active channels (the residence time of the output signal of the sampler 3 in the unit state). With an increase in the rate of oiros, determined by the frequency of converter 13, the average value of the signal at the output of the element OR AND decreases. To smooth the signal at the output of the element OR 11, a filter 12 is used. At the output of the converter 13, the frequency at which the approximation error is equal to the specified one stops. If the frequency of converter 13 is reduced, modulator 5 can change the parameters of its output signal, for example, pulses can be expanded during CMM modulation, etc. The same applies to the clock coder. This makes it possible to significantly increase the signal immunity. The device works as follows. The discretization unit 3 continuously analyzes the sigals of the sensors 1 and, as it exceeds the accuracy of the approximation of a given value, produces a single output signal. The sensor signals of the channels in which the samplers worked, are alternately connected to the input of the modulator 5 under the action of the distributor 6, elements 4 and measuring keys 2. For channels in which the approximation error is less than the specified one (the samplers did not work), only sync signals were transmitted to the air from the encoder 8 sync signals. For example, when using VIM modulation, only reference pulses go on the air, with CIM modulation, only marker emulsions, etc. Due to this, the average operation time of the GO radio transmitter is reduced, and it is possible to increase the peak power, which is done using a filter 9 Element OR 11, filter 12 and converter 13 set the required device speed, at which the approximation error only in the most dynamic channels slightly exceeds the specified one. Since the maximum activity of the input signals is achieved relatively rarely, the average device speed is significantly less than the maximum possible, due to which the duration of the input signals of the modulator 5 and the radio transmitter 10 increases and, therefore, their noise immunity increases. Broadcasting only essential (non-redundant) signals significantly reduces the average operation time of a radio transmitter, which allows even more protection of radio signals from interference by increasing the peak power of the radio transmitter. Form of the invention The transmitting radio telemetry device containing in each channel a sensor connected to one input of the measuring key, the outputs of all measuring keys are connected to the first input of the modulator, the second input of which is combined with the input of the pulse distributor c input of the clock coder, the output of the clock coder is connected to one input of the first element OR, the second input of which is connected to the output of the modulator, and the output to the input of a radio transmitter, characterized in that, in order to increase the noise immunity Transmitters, adaptive time samplers, AND elements, OR element, low-pass filters and a converter into frequency are entered into the device, with each sensor output connected to the nerve input of the adaptive time sampler, the output of which is connected to the first input of the element I, element output And connected to the other inputs of the measuring key and adaptive time sampler, the outputs of all adaptive time samplers are connected to the corresponding inputs of the second element OR, connected through the serially connected first low-pass filter and voltage-to-frequency converter to the common connection point of the modulator inputs, clock encoder and distributor whose outputs are connected to the second input of the AND element of each channel, the output of the first element OR is connected through the second low-pass filter to the second radio transmitter input.