SU488171A1 - Signal detection device - Google Patents

Description

one

Selection refers to radio engineering.

A device for detecting signals is known, which contains a threshold circuit, one output of which is connected to a summing and the other to subtracting the inputs of a reversible counter, respectively, through a series-connected signal sampling unit in time and a block of weighting coefficients; and a decisive circuit, connected to the output of a reversible counter. However, such a device has insufficient dynamic range.

In order to expand the dynamic range in the proposed device, the control input of each of the weighting blocks is connected to the output of the decision circuit, and the multiplication inputs are connected to its output via a serially connected frequency divider and an additional reversible counter, the subtracting input of each additional reversible counter being connected to the summing the input of another additional reversible counter.

The drawing shows a block diagram of the proposed device.

The device contains a threshold circuit 1, two outputs of which are connected to the sum Hr, HM and subtractive inputs of the reversing counter 2 through a series-connected

the unit dskretizatsii signals in time 3 and the block of weights 4; a decision circuit 5 connected to the output of the reversible counter 2. The control input of each weight unit is connected to the output of the decision circuit, and the multiplication inputs are connected to its output through a serially connected frequency divider 6 and an additional reversible counter

7, with the subtracting input of each additional reversible counter soe. Aipen with the summing input of another additional reversible counter. The device works as follows.

The received signal is limited by the threshold circuit 1 and is fed to the input of the sampling unit of signals DO of time 3--1, which fixes the input level of the threshold level (outliers), i pa input of the sampling unit of signals 3-2, fixing the input signal, the magnitude of the threshold level ( failures). Time-quantized emissions from the output of the block 3–1 are sent to the input of the block 4–1, and time-quantified irovals - to the input of the block 4–2. From the outputs of blocks 4-1 and 4-2, the pulses go to the summing and subtracting inputs of counter 2, respectively. A counter 5 is connected to the output of the counter, which determines whether there is a signal at the device input if the counter reads out before the specified fixed number, or noise if the counter reads less than the specified number. At the same time, pulses from the outputs of blocks 4-1 and 4-2 are fed to the inputs of frequency dividers 6-1 and 6-2, respectively, i.e., their constant division factor, the outputs of which are connected in parallel to the inputs of counters 7-1 and 7-2. If the circuit 5 determines the signal at the device input, then the signal at its output is not changed and, accordingly, in blocks 4-1 and 4-2, the previously established weighting factors do not change. If circuit 5 detects noise at the device input, then new weights are inserted into blocks 4-1 and 4-2. Thus, the device allows detection of signals other than signals containing an average emission density and dip.

Claims (1)

Invention Formula A device for detecting signals containing its threshold circuit, one output of which is connected to the summing, and the other to subtracting, and their inputs to the reversible counter, respectively, through successively connected signal sampling unit in time and the block of weights, and deciding the circuit connected to output reversible counter, characterized in that, in order to expand the dynamic range, the control input of each of the blocks of weights is connected to the output and the multiplication inputs with its output through a serially connected frequency divider and an additional reversible counter, the subtractive input of each additional reversible counter being connected to the summing input of another additional reversing counter.