SU566385A1 - Receiver of quasiincidental signals modulated by delay - Google Patents

Description

I

The image refers to radio communications and can be used in space communications, radar, discrete information transmission systems, etc.

A device for receiving pseudo-random signals modulated by a delay, which contains an input multiplier of a phase-locking system (PLL), a rotator 0a 1G / 2, a synchronous detector, a discriminator, a controlled clock frequency generator, and a pseudorandom sequence generator l

However, the known device requires a relatively long time of introduction into the synchronous mode and is not sufficiently noise-resistant.

The closest technical solution is a pseudo-receiver receiver; x delay-modulated signals containing an input multiplier, whose inputs are interconnected via a delay line, and the output with a filter, a phase detector with a low-pass filter, whose output is connected to the input of a controlled oscillator and shift register to one

the inputs of which are connected to the output of the controlled generator 2.

However, this device has a low noise immunity.

The purpose of the invention is to improve noise immunity.

Claims (2)

To do this, a pseudo-random delay modulated receiver, containing an input multiplier whose inputs are interconnected via a delay line, and an output with a filter, a phase detector with a low-pass filter, the output of which is connected to the input of the controlled oscillator, and a shift register, To one of the inputs of which the output of the controlled generator is connected, an additional chip multiplier, a phase shifter, a decoder and a trigger are inserted, between the Bbt filter inlet and the input of the phase detector to the BTOpoKiy input otorrhea controllably connected to the output of the generator through the f & zovraschatel included additional multiplier, to the second input of which are connected outputs bits through a shift register and decoder serially connected trigger. The drawing shows the electrical circuit of a 1 cc arrays of a pseudo-random signal modulated with delay modulated signals. The device contains an input multiplier 1 with filter 2, a phase detector 3 with 4 low frequency 4 which is connected to the input of the controlled oscillator 5, and a shift register 6, to one of the inputs of which is connected the output of the controlled gene & 5, the multiplier of multiplier 7 , phase shifter 8, decoder 9, trigger 10 and delay line 11, while between output 2 and the input of phase detector 3, to the second input of which the output of controlled generator 5 is connected through phase shifter 8, the Telny multiplier 7 is connected to eitJpoMy input of which Turning outputs bits of the shift register 6 via a series-connected flip-flop 9 and decoder 10, and between the input of multiplier 1 is enabled delay line inputs 11. The apparatus operates as follows. A preselected pseudo-random sequence (PRS) arrives at the input of the receiver. Information modulation is performed using the time delay of the modulating PRS. P | W manipulation of the delay information unit can correspond to the transfer of one period of the SRP, and informational zero - the transfer of the next period of the SRP, but delayed for a period of G. The value of T should be (T) where tn is an integer, T is the period of oscillation of the clock frequency. The resulting memory bandwidth is supplied to an oscillation pattern having a frequency equal to the memory clock frequency. This circuit corresponds to an input multiplier 1, a delay line 11, and a filter 2. The operation of this circuit is as follows. In the production spectrum of the SRP and the same SRP, shifted in time by the value of t, it contains s equal to the frequency y of the equal clock frequency of the SRP. The power of this component of the spectrum is maximum at - P, -l. D. ... The oscillation of the frequency range is enhanced by filter 2 tuned to the average value of this frequency. The delay bandwidth modulation of the clock causes the phase harmonic to be manipulated by 180, therefore the phase of the oscillating clock frequency changes according to the information and binary symbols. The bandwidth of the filter 2 must ensure the transmission of such oscillations. The selected oscillation enters an additional multiplier 7, the second input of which receives a reference square wave, formed using shift register 6 with feedback, decoder 9 and trigger 10. For the period of entering the synchronous mode, the square wave is transmitted, the half-period is equal to the start bandwidth and the beginning meander corresponds to the beginning of the CAP. Phase detector 3 produces a voltage, the magnitude and sign of which depends on the mismatch between the oscillation obtained from the output of the additional multiplier 7, and the sinusoidal oscillation from the output of the phase shifter 8. This voltage goes through a low-pass filter 4 to the controlled oscillator 5, which changes The clock frequency of the shift register 6 is in reverse, which leads to the elimination of the misalignment and the input of the receiver to the synchronous mode. Formula of a Receiver Receiver of pseudo-random signals, delay-modulated, containing an input intermitter, whose inputs are interconnected via a delay line, and the output with a filter, a phase detector with a low-pass filter, the output of which is connected to the input of a controlled oscillator, and shift register, y. one of the inputs to which is connected to the output of a controlled oscillator, characterized in that, in order to improve the noise immunity, an additional alternator, phase shifter, decoder and trigger are introduced, while the filter output and the input of the phase detector are connected to the second input, the output of the controlled detector is connected to the second input a generator through a phase shifter, an additional multiplier is included, to the second input of which there are connected the outputs of the pasfeds of the shift register through the serially connected decipher and Tpirrep. Sources of information taken into account in the examination; 1.Alekseev A.I. and others. Theories and application of pseudo-random signals. M., Science, 1966 with. 216. 2. USSR author's certificate number 347942, cl. H 04 L 13/18, 1970.