SU790357A1 - Device for synchronizing pseudorandom signals - Google Patents

Description

The shift of the shift and the block for determining the direction of the shift, the outputs of which are connected to other inputs of the shift register, while the outputs of the control block are connected respectively to the third input of the block for calculating the shift interval. ha and the generator input subframe pulses, the output of the amplitude detector through a series-connected re-. the circulator and the maximum signal extraction unit are connected to another input of the subframe pulse generator, the output of the frame pulse generator is connected to other inputs of additional detectors, and the output of the subframe pulse generator to other inputs of the gating blocks, the input of the reference generator being combined at the input with a matched filter whose output is connected to the inputs of the amplitude and phase detectors.

This is a structural electrical circuit diagram of the device.

The device for synchronization of the MSS contains matched filter I, amplitude detector 2, recirculator 3, block 4 for extracting the maximum signal, reference generator 5, phase detector 6, limiters 7 and 8, additional recirculators 9 and 10, blocks 11 and 12. a maximum signal selection unit 13, a sub-frame pulse generator 14, a shift register 15, a frame pulse shaper 16, a shift interval calculation unit 17, a shift direction determining unit 18, a control unit 19,

The device works as follows.

The input MSS is fed to the matched filter I and the reference generator 5 The MSS synchronization is performed in two stages.

At the first synchronization stage, the output signal of matched filter I is detected by the amplitude detector 2 and accumulated by the recirculator 3. The frame pulses controlling the beginning and end of the accumulation interval of the output signal of the detector 2 into the recirculator 3 are generated by the shaper 16 from the sequence of subframe generator pulses 14. Block 4 fixing the moment when the output signal of the p-ecirculator 3 reaches its maximum value and, by adjusting the generator 14, eliminates the temporal mismatch between the pulse sub frames n maximum of the output signal of 1 hr decay 3. When

In this case, the signal from the output of block 19 control does not allow the adjustment of generator 1.a 14 only during the period of the last subframe. Thus, at the first stage of operation of the device, the PSS is synchronized within the subframe and conditions are prepared for the operation of the reference driver 5, which gives the cohe. rent oscillation for phase detector 6.

At the second stage, the synchronization stage is repeated; the operation of the first stage of synchronization is excluded except for the already completed adjustment of the generator 14. The measured value of the maximum output signal of the recirculator 3 is fed from the output of block 4 to the corresponding poor input of block 17. The output signal of the matched fiber 1 also enters the phase detector 6, where it is subjected to coherent; detection. The limiter 7 passes the detected signal of positive polarity, and the limiter 8 passes the negative (or vice versa) signal. Recirculators 9 and 10 accumulate the detected signals of the corresponding polarity. The operation of recirculators 9 and 10 is also performed by shaper 16. The output signals of recirculators 9 and 10 are fed to gating units 11 and 12, which are controlled by generator 14. The signals from the outputs of blocks II and 12 are fed to the corresponding inputs of block 13, which compares these signals are the largest and gives the value of the largest of them to blocks 17 and 18. Block 18 determines the direction of the shift and provides to register 15 information about the direction in which the frame pulse needs to be shifted in order to achieve complete synchronism with the input MSS. Block 17, which is included in the operation of pulses from the output of control block 19, calculates and issues to register 15 information on the number of subframes to which the frame B, the | th pulse, to go into synchronism. Register 15, having received control signals from the outputs of blocks 17 and 18, shifts the frame pulse generated by shaper 16 in time, ensuring coincidence; the beginning and end of the frame of the input signal with the beginning and end of the frame of the signal of the driver 16. At this time, the synchronization of the MSS ends.

The proposed device allows the synchronization of the MSS for a 2-, 5-per-pio npjiuirr-rioNroro signal. In addition, nocKo.D.-iiy (the Nypa synchronization of the MSS is based on the results of matched filtering of the half frame of the input signal, the device has the highest noise immunity.

Claims (1)

Invention Formula A device for synchronizing pseudo-random signals containing a matched filter, a reference oscillator, the output of which is connected to the input of a phase detector, another input of which is combined with an input of an amplitude detector and sequentially connected subframe pulse generator, a shift repressor and a frame pulse generator, the output of which is connected respectively to the inputs control panel and control unit, the other input of which is connected to the output of the subframe pulse generator, characterized in that, in order to increase synchronization rates, a maximal signal extraction unit, a shift interval calculation unit and a shift direction determination unit are entered, and the output of the phase detector is connected to the inputs of two parallel circuits, each of which contains a serially connected limiter, an additional crank and gating unit, outputs which are connected to the inputs of the unit you-. boron maximally sigial, y.khod k-ltorogo connected to each other to the gaming inputs of the block B1, cHL1H n) g. connected to the third input of the shift interval calculating unit and the generator input of subframe pulses, the output of the amplitude detector through the successively connected recirculator and the maximum signal extraction unit connected to another generator input subframe new impulses, the output of the personnel pulse generator is connected to other inputs of additional recirculators, and the generator output of subframe pulses is connected to other inputs of gating units, the input of the reference generator being integrated at the input with a matched filter f whose output is connected to the amplitude and phase detectors. Sources of information received during the examination under examination I. Jürgen, Veloris. Modeling and research of the modem performance of pseudo-random signals with coherent frequency tuning. Expression of information, seri Transmission of information, M., VINITI, 1977, K 31, p. 9II (prototype).