SU873438A1 - Matched radio link with noise-like signals - Google Patents

Description

(54) COMBINED RADIOLINES WITH NOISE-LIKE

SIGNALS

I

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

A known combined radio line with noise-like signals, comprising a synchronizer on the transmitting side and serially connected clock, a pseudo-random sequence generator, a switch and a phase modulator, the synchronizer input being the input of the information channel and the output connected to the second input of the switch, and on the receiving side - series-connected synchronous detector, phase detector, low-pass filter, series-connected clock pulse generator c and a pseudo-random sequence generator, the output of which is connected to the second input of the phase detector and a serially connected mixer, integrator and threshold unit, with both inputs of the mixer connected to the corresponding inputs of the phase detector 1.

However, the known line has a significant effect of the information channel on synchronization accuracy and a long time to get into synchronism.

The purpose of the invention is to increase the synchronization accuracy and decrease the time taken to synchronize.

The goal is achieved by the fact that in the combined radio link with the noise-like and containing signals on the transmitting side

 synchronizer and serially connected clock generator, pseudo-random sequence generator, switch and phase modulator, the synchronizer input being the input of the information channel, and the output connected to the second input of the switch, and on the receiving side - serially connected synchronous detector, phase detector , low pass filter, serially connected clock generator and pseudo-random sequence generator, the output of which is connected to the second input AZOV detector and mixer connected in series, integrator and threshold unit, the two mixer inputs are connected to respective inputs of the phase detector at the transmitting side introduced flow shaper token generator and the sawtooth voltage, the shaper block marker input is connected to the second output

pseudorandom sequence generator, and the output is connected to the control input of the sawtooth generator and another synchronizer input, and the output of the sawtooth voltage generator is connected to the control input of the clock generator, and sequentially connected marker driver, OR element and sawtooth generator are input at the receiving side voltage, the output of which is connected to the input of the generator of clock pulses, and the second input of the element OR is connected to the output of the low-pass filter, n At the same time, another pseudo-random sequence generator output is connected to the input of the marker generator.

The drawing shows a structural electrical circuit of the proposed radio link.

The combined radio lines with noise-like signals contain a phase modulator I, a generator 2 sawtooth voltage, a generator of 3 clock pulses, a generator 4 of a pseudo-random sequence, a block 5 of a marker former, a synchronizer 6, switch 7, a synchronous detector 8, a phase detector 9, a low-pass filter 10 , a pseudo-random sequence generator 11, a marker driver 12, a clock pulse generator 13, an OR 14 element, a sawtooth voltage generator 15, a mixer 16, an integrator 17 and a threshold unit 18.

The device works as follows.

The generator 4 generates a maximum length sequence modulated in duration, the duration of which elementary symbols is determined by the frequency of the clock of the generator 3, the frequency of the latter varies according to a linear law defined by generator 2. In the synchronizer 6, the input of which receives marker pulses and discrete information the duration of the information package is related to the duration of the marker, i.e. At the output of the synchronizer 6, information parcels are formed with a duration that is a multiple of an integer number of marker element parcels. Switch 7, depending on the alternation of synchronized "single and" zero information characters arriving at its input, connects the p-th or (p-1) -th outputs of generator 4 to the phase modulator. As a result, at the output of switch 7 there is a sequence M c the output of the (n-1) th bit of the generator 4 or the inverted sequence Mj; from p-th bit, promo) 1, by length, linear function, which alternate in accordance with the transmitted information. In the phase modulator 1, the high-frequency carrier phase is manipulated by the resulting signal from the output of the switch 7. At the receiving side, as a result of input signal demodulation by the synchronous detector 8, a video sequence modulated in duration is obtained, which is then fed to the mixer 16, to the first input of which the sequence from the output of the local oscillator 11, in the synchronism mode, the leading sequence M and lagging behind the MS sequence by part of the clock interval, and t kzhe this video sequence is fed to a phase detector 9, which compares the phase of two linear functions. The linear function received is the unmodulated transmitted information and its phase has a linear dependence on the detuning between the incoming signal and the reference one. Due to the phase mismatch of these two functions, the phase locked loop operates, maintaining a constant mismatch between the input and reference signals. The discrete information is embedded in the constant component of the output signal of the mixer 16 and allocated by the integrator 17, and then goes to the threshold unit 18 and to the receiver.

The advantages of the proposed device in comparison with the known one are in higher noise immunity and reduction

time of entry into synchronism. The syncronization time in the proposed device is Tc, P 1,2, ..., where m is the number of symbols in the SRP period, Trp is the SRP period (the calculation time of the intercorrelation function is the integration time).

Increased noise immunity is achieved due to the fact that the phase of a received memory bandwidth can be determined by measuring the duration of any element in the memory bandwidth that is not affected by interference when it is received or the level of interference is insufficient.

for the occurrence of an error when measuring the duration of an element.

Claims (1)

Invention Formula Combined radio with sound-like signals containing a synchronizer on the transmitting side and serially connected clock generator, a pseudo-random sequence generator, a switch and a phase modulator, the synchronizer input being the input of the information channel and the output connected to the second input of the switch, e on the receiving side series-connected synchronous detector, phase detector, low-pass filter, series-connected clock generator and generator a pseudo-random sequence torus whose output is connected to the second input of the phase detector and a serially connected mixer, integrator and threshold unit, with both inputs of the mixer connected to the corresponding inputs of the phase detector, characterized in that in order to increase synchronization accuracy and decrease the time to match , a marker forcing unit and a sawtooth voltage generator are inputted on the transmitting side, with the input of the marker forming unit connected to the second output of the generator torus pseudorandom sequence, and the output is connected to the control input of the sawtooth generator and another synchronizer input, and the output of the sawtooth voltage generator is connected to the control input of the clock generator, and on the receiving side A sequentially connected marker driver, an OR element and a sawtooth voltage generator, the output of which is connected to the clock pulse input, and the second input of the OR element are connected to the low pass filter, while another output of the pseudo-random sequence generator is connected to the marker shaper input. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 350194, cl. H 04 L 5/02, 1970 (prototype).