SU1645183A1 - Receiver for track circuit - Google Patents

Description

The invention relates to railway automation, in particular to rail track monitoring devices.

The purpose of the invention is to increase reliability.

The drawing shows the functional diagram of the device.

The receiver contains a band-pass filter 1, an envelope detector 2, an integrator 3 connected to it, a sampler 4, the output of which is connected to the multiplier 5, and the second input is connected to the output of the first correction unit 6, and the output is connected to the input of the subtractor 7 connected to the second correction unit 8, and the output connected to the input of the adder 9, whose output is connected to the inputs of the delay element 10, the switch 11 and the threshold (element 12.

The receiver works as follows.

The input signal from the rail line y (t) through the bandpass filter 1 is fed to detector 2. In integrator 3, the detected signal is integrated and then fed to sampler 4. Using sampler 4, the input signal envelope is temporarily quantized. At an arbitrary time, the discrete value of the input signal is fed to the input of multiplier 5. At the second input of multiplier 5, there is a signal proportional to the value (9p-b,) cf gJy $} the average value of the input signal in the shunt mode; 02 - the average value of the input signal in the normal mode of track C - the noise dispersion in the rail line. From the output of the multiplier 5, the product (0,) yk / Cf is fed to the first input of the subtractor unit 7. At its second input, there is a constant signal proportional to the value (bg 9) / (2i). From the output of the subtractor, the signal proportional to the value ((Ol-b) / (2 (3) is fed to the first input of the adder 9.

The output of the adder 9 produces a signal proportional to the decisive statistics.

Q 5 0

5 0 5

five

KN

0

L + bg-b, v 0

T cfr y "

Claims (1)

If the decisive statistic 8c at an arbitrary rth time is less or equal to zero, the third input of the adder 9 from the output of the comparator 11 is supplied with a control pulse, with the help of which the sum value SK is forcibly zeroed. If the value of S is greater than zero, the process of calculating the decisive statistics continues at the + 1 step. The signal from the output of the adder is fed to the input of the threshold element 12, by means of which the state of the rail line is recorded. If the accumulated value of the sum S c + + exceeds a certain fixed value of the limitation threshold, the vacancy of the rail line is fixed. Otherwise, the rail line occupies the rolling stock. Invention Formula A receiver for a track circuit, containing a filter-connected input through a filter, an envelope detector connected to the last output by an integrator whose output is connected to a sampler, an adder whose output is connected to the comparator input, and a recorder that is different in that reliability, it is equipped with a multiplier, subtractor, delay element and correction blocks, the outputs of which are connected respectively to one input of the multiplier, the other input of which is connected to the output of the sampler, and one input of the subtractor, the other input of which is connected to the output of the multiplier, and an output - to one of inputs of the adder, the other input of which is connected to the output of the comparator, and the third - with the output of the delay element having an input coupled to said output of the adder connected to the logger.