SU862364A1 - Radio signal receiver - Google Patents

Description

The invention relates to radio engineering and can be used in acoustic location systems, in flaw detection and measurement technology.

A radio receiver is known that contains a matched filter, a delay element, and a key connected in series and a zero authority 1.

However, this radio signal receiver has insufficient accuracy in determining the maximum of the received signal due to the small steepness of the derivative of the received signal envelope at the extremum point.

The aim of the invention is to increase the accuracy of determining the maximum of the received signal.

To do this, in the radio signal receiver, which contains a matched filter, a delay element and a key and a null element connected in series, between the output of the matched filter and the key input a preliminary signal maximum determining unit is included, the control input of which is connected to the zero organ output and the delay element is turned on between the output of the matched filter and the control input of the key.

In addition, the maximum signal pre-determination unit is made in the form of a full-wave converter connected in series, a threshold element, a subtractor, a comparator, a temporary discriminator, and a rectangular pulse generator, between the output of the threshold element 5 and the other subtractor input, the accumulator is switched, the other input is control the input unit of the preliminary signal maximum determination. FIG. I depicts a structural electrical circuit of the proposed radio receiver; in fig. 2 shows the stress diagrams for its operation.

Radio receiver contains matched filter 1, delay element 2,

15 key 3, zero-organ 4, block 5 of preliminary signal maximum determination, full-wave converter 6, threshold element 7, subtractor 8, comparator 9, time discriminator 10, generator 11

20 square-wave impulse and accumulator 12. The radio signal receiver operates as follows.

At the output of matched filter 1, the signal shown in FIG. 2a

25 In FIG. 26 shows the signal at the output of the delay element 2. The magnitude of the delay is equal to half the period of oscillation of the carrier T. At the output of block 5, a pulse is formed, shown in FIG. 2g, with a length of 7/2, corresponding to a preliminary estimate of the position of the maximum of the signal on the time axis. Key 3 opens and passes to the null organ 4 a fragment of the input signal shown in FIG. 2z. The nullorgan determines the moment of intersection of the carrier time axis, which uniquely determines the location of the signal maximum on the time axis.

The signal from the full-wave converter shown in FIG. 2b, through the threshold element 7 enters the drive 12, the output signal of which is shown in FIG. 2g. At the output of the subtractor, the signal shown in FIG. 2d At the output of the comparator 9, rectangular pulses are formed, shown in FIG. 2nd. If the pulse duration at the output of the comparator 9 is greater than T / 2, the time discriminator generates a pulse shown in FIG. 2g, duration G / 2. The null organ 4 also generates a signal for resetting accumulator 12.

Claims (2)

1. A radio signal receiver containing a matched filter, a delay element, and connected in series with a key and a zero-organ, characterized in that, in order to extract the accuracy of the maximum received signal, between the output of the matched filter and the key input there is included a preliminary signal maximum detection unit, the control input of which is connected to the output of the zero body, and a delay element is connected between the output of the matched filter and the control input of the key. 2. Receiver according to claim 1, characterized in that the block of preliminary determination of the maximum of the signal is made in the form of a full-wave connected a converter, a threshold element, a subtractor, a comparator, a time discriminator, and a square pulse generator, between the output of the threshold element and another input of the subtractor, a drive is connected, the other input of which is the control input of the signal maximum preliminary determination unit. Sources of information taken into account in the examination 1. USSR author's certificate No. 555545, cl. H 04B 1/00, 1975 (prototype).