SU569037A1 - Combined radio line with interference-like signals - Google Patents

Description

The invention relates to radio engineering and can be used to measure motion parameters of objects.

One of the known radio links with noise-like signals is based on the combination of synchronization channels and information, the clock signal is extracted from the signal carrying discrete information transmitted by phase manipulation on the carrier OR by modulating the delay-like noise-like code (pseudo-random sequence) 1. However The known radio link has the influence of the information channel on the synchronization accuracy.

Closest to the proposed invention, the technical solution is a combined radio line with sound-like signals, containing on the transmitting side a phase modulator and a synchronizer connected to a clock generator connected through a pseudo-random sequence generator (SRP) to a switch connected to the output of the synchronizer, which input the input of the information channel, and on the receiving side, the RING of the phase-locked loop, containing a serially connected mixer , STRIP filter, phase detector, low frequency filter, controlled geerator, the output of which is connected to another

input phase detector, and a generator of the SRP, the output of which is connected to the first input of the mixer, to the second input of which is connected the output of the synchronous detector 2. However

and this LINE has a significant influence of the information channel on synchronization accuracy.

The purpose of the invention is to reduce the influence of the information channel on synchronization accuracy. To do this, in the combined radio link with noise-like signals on the transmitting side, an modulo-two modulator is entered, the first input of which is connected to the switch output, the second input - to the output

synchronizer, and the output is connected to the input of the phase modulator, a threshold device and an integrator are entered at the receiving side, and the mixer output is connected via an integrator to the input of the threshold device, the output of which is the output, m of the information channel.

The drawing shows a structural electrical circuit of the proposed radio link. The combined radio line with noise-like signals contains on the transmitting side a phase modulator 1, a synchronizer 2 connected to a generator of 3 clock pulses connected through a pseudo-random sequence generator 4 to the switch 5 connected to the output terminal

synchronizer 2, whose input is the input, m of the information channel, as well as the adder 6 modulo two, the first input of which is connected to the output of the switch 5, the second input to the output of the synchronizer 2, and the output connected to the input of the phase mod. torus}. The receiving side of the combined radio link contains a phase locked loop 7 comprising a serially connected mixer 8, a band-pass filter 9, a phase detector 10, a low-frequency filter, an oscillator 12, the output of which is connected to another input of the phase detector 10, and a generator CAP 13. The output of the generator 13 is connected to the first input of the mixer 8, to the second input of which the output of the synchronous detector is connected 14. On the receiving side there is also a threshold device 15 and an integrator 16, and the output of the mixer 8 through the integrator 16, 1 is connected to the input of the threshold device 15, the output of which is the output of the I information channel.

The combination of radio line works as follows.

The SRP 4 generator generates a maximum length sequence (M-sequence), the elementary symbol duration of which is determined by the clock clock pulse frequency generator of generator 3. At synchronization 2, to the input of which clock pulses and discrete information are received, the information package duration is assigned to the duration of the elementary symbol of the sequence, i.e., at the output of synchronizer 2, informational parcels are formed with a duration multiple to an integer number of elementary parcels osledovatelynosti. Switch 5, depending on the alternation of synchronized "single n" zero information characters arriving at its input, connects the lth or (n-1) th outputs of the PSP 4 generator to the adder 6 modulo two, to the second input which arrive the same as on the switch 5 info-rmaadionnyh parcels. As a result, two modulated signals at the output of 14 sum at the output have a sequence of M from the output of the (n-1) -th bit of the SRP generator, or converted. a sequence of MTs from the n-th bit, which alternate in accordance with the transmitted information. The phase modulator / phase modulates the high-frequency carrier of the resulting signal from the output of the adder 6. At the receiving side, as a result of the input demodulation of the input signal, the synchronous detector produces a video "phase delay of the transmitted information, which then enters mixer 5, to the first input of which the sequence comes from the output of the generator bandwidth, in the synchronization mode, leading the sequence M and lagging behind the sequence Mt by 5 at the clock interval. The band-pass filter 9 extracts the first harmonic of the clock frequency, which in this case is the unmodulated transmitted information, and its phase has a linear dependence on the detuning between the incoming signal and the reference sequence. According to the first harmonic of the clock frequency, the phase self-tuning ring works, maintaining a constant mismatch between the input and on-signal signals, equal to half of the clock interval. The discrete information is embedded in the constant component of the output signal of the mixer I and allocated by the integrator 16, and then goes to the threshold set-15 and to the receiver.

Formula .n 3 about b ete and

Combined) with noise-like signals, a phase modulator and a synchronizer connected to the transmitting side, connected to a clock generator connected via a pseudo-random sequence generator to the switch connected to the output of the synchronizer, whose input is the input of the information channel , and on the right side there is a phase-locked loop, containing a series-connected mixer, an idol filter, a phase detector, a low-pass filter controlled by The generator, the output of which is connected to another input of the phase detector, and the SRP generator, the output of which is connected to the Perz input of the mixer, to the second input of which is connected the output of the synchronous detector, which in order to reduce the influence of the information channel on the synchronization accuracy , on the transmitting side, an adder modulo “two” is entered, the first input of which is connected to the output of a Commutator, the second input - to the output of the synchronizer, and the output is connected to the input of the phase modulator; oystvo and .integrator, the output of the mixer through an integrator connected to the input ustroysgva threshold, the output of which is output information kaiala.

Sources of information taken into consideration in the examination:

/one. Author's certificate number 350194, cl. H 04 L 5/02, 1970.

2. Copyright certificate № 347942, cl. H 04 L 13/18, 1970.