SU1069182A1 - Device for synchronizing correlative type receiver of pseudo-random signals - Google Patents

Abstract

DEVICE TIMING correlation receivers pseudorandom signal containing combined by the information input device, the first and second multipliers, sequentially connected a first integrator, a first gate amplifier and a phase detector, a second input of which is connected to the output of the second integrator via a second gate amplifier connected in series a lowpass filter generator clock pulses, a pseudo-random signal generator (PSS) and the third multiplier, the output of which is connected to the second input of the second multiplier, and to the second input of the first multiplier the output of the MSS generator is directly connected, the other outputs of which are connected to the corresponding inputs of the decoder, the output of which through the control unit is connected to the first inputs of the first and second integrators and the second inputs of the first and second gate amplifiers, wherein the output of the frequency divider, the input of which is connected to the output of the clock generator, the output of the first multiplier is connected to the second input of the control unit The bodies are connected to the second input of the first integrator, and the output of the phase detector is connected to the input of a low-pass filter, characterized in that, in order to improve the tracking accuracy, the L modulator, the shift register and the key are entered in it whose output is connected to the second input of the second integrator, and the second input is connected to the output of the second multiplier, the output of the element is NOT connected to the second input of the shift register, and the input is combined with the second o :) input of the third multiplier and connected to the input of the MSS generator; X) whose auxiliary output is connected to the first input of a modulo-two adder; to the second input of which is ND Pig the output of the PSS generator is connected.

Description

The invention relates to radio engineering and can be used in radio technical communication systems and control. A digital delay tracking device is known, containing the first and second multipliers combined by the information input, the second inputs of which are connected to the corresponding outputs of the reference generator of pseudo-random sequences, to the input of which the output of the crystal oscillator is connected through a serially connected control unit and a divider, and also successively connected modulo two, the element And and the reversible counter, the outputs of which are connected to the corresponding inputs of the control unit , The outputs of the first and second multiplier connected to respective inputs of adder modulo two and the respective inputs of the reversible counter and;, the crystal oscillator output is connected to the second input member disadvantage digital delay tracking device is insufficient accuracy of the estimation error signal. The closest technical solution to the invention is a synchronization device of a correlation receiver of pseudo-random signals, containing the first and second multipliers, the first integrator, the first gate amplifier and the phase detector, connected to the second input of the second integrator through the second input the second strobe amplifier, a low-pass filter connected in series, a clock pulse generator, a MSS and a third transducer The output of which is connected to the second input of the second multiplier, and the output of the PSS generator is connected to the second input of the first multiplier directly, the other outputs of which are connected to the corresponding inputs of the decoder, the output of which through the control unit is connected to the first inputs of the first and second integrators and the second inputs of the first and second the second gate amplifiers, while the output of the frequency divider is connected to the second input of the control unit; its input is connected to the output of the clock generator, the output of the first The multiplier is connected to the second input of the first integrator, and the output of the fs1 detector is connected to the input of the low-pass filter, and the output of the second multiplier is connected to the second input of the second integrator 2. A disadvantage of the known synchronization device of the correlation receiver of pseudo-random signals is the insufficient accuracy of the synchronizing correlator when presence of noise at the input of the device. The purpose of the invention is to improve the tracking accuracy. The goal is achieved by the fact that a synchronization device of a correlation receiver of pseudo-random signals, containing the first and second multipliers combined in series by the information input of the device, the first integrator connected in series, the first gate amplifier and the phase detector, to the second input of which the output of the second integrator is connected through the second gate amplifier, in series United low pass filter, clock pulse generator, pseudo-random signal generator (PSS) and tert The multiplier, the output of which is connected to the second input of the second multiplier, and the output of the PSS generator directly connected to the second input of the first multiplier, the other outputs of which are connected to the corresponding inputs of the decoder, the output of which through the control unit is connected to the first inputs of the first and second integrators and the second inputs of the first and the second gate amplifiers, while the output of the frequency divider is connected to the second input of the control unit; its input is connected to the output of the clock pulse generator The output of the first multiplier is connected to the second input of the first integrator, and the output is connected to the input of the low-pass filter of the phase detector, the element is entered and the modulo-two modulo two in series, the shift register and the key whose output is connected to the second input of the second integrator, and the second input is connected to the output of the second multiplier, the output of the HEi element is connected to the second input of the shift register, and the input is connected to the second input of the third multiplier and connected to the input of the MSS generator, an additional the output of which is connected to the first input of the modulo two adder, to the second input of which the output of the MSS generator is connected, FIG. Figure 1 shows a block diagram of a synchronization device of a correlation receiver of pseudo-random signals; in fig. 2 - plots showing his work. The synchronization device of the correlation receiver of pseudo-random signals contains alternators 1 and 2, integrators 3 and 4, gating amplifiers 5 and 6, phase detector 7, low pass filter 8, clock generator 9, oscillator pbs 10, multiplier 11, adder 12 modulo two, a shift register 13, a key 14, a NOT 15 element, a decoder 16, a frequency divider 17, and a control block 18. The synchronization device of the correlation receiver of pseudo-random signals operates as follows. The input signal arriving at the first inputs of multipliers 1 and 2 is multiplied by reference signals (Fig. 2 g) and (Fig. 2 b), respectively. The result of multiplication (without high-frequency filling) in multiplier 2 is shown in FIG. 2 q, where the arrows indicate the possible limits of the change of this signal in the tracking mode for different detuning i of the input and reference dog. From (Fig. 2 Q) it can be seen that only in the indicated 1 intervals the output signal of the multiplier 2 contains information about tracking error. Therefore, it is only at these time intervals (Fig. 2 &) that integrator 3 should work. The plots in Fig. 2 q, g, 3, explain how the signal for controlling the key 14 is generated: the control signal is a modulated result of two modulated two two adjacent PSSs shifted by half of the clock period in shift register 13 and therefore also an MSS; the element NOT 15 provides the operation of the DZ shift register from the positive edge of the clock pulses (Fig. 2 S) if the PSS 10 generator is triggered from the negative front. The signals from the output of multipliers 2 and 1 are fed to integrators 3 and 4 and then to building amplifiers 5 and 6 directly in the information correlator and through key 14 in the synchronizing correlator. The key 14 is opened by positive pulses of the output of the shift register 13 (Fig. 2e). In the gate amplifiers 5 and 6, a part of the integrated voltages is cut, directly adjacent to the expected ends of the working signals defined by control unit 18, to the inputs of which a pulse is output from the decoder 16 with a Period equal to the MSS period and pulses from the output of the frequency divider 17. From the output of the gate amplifiers 5 and 6, the oscillations arrive at the phase detector 7, where the error signal of the snooper is extracted, which through the low-pass filter 8 acts on the clock pulse generator at 9, change the phase of the clock pulses. And, therefore, the position of the reference (Fig. 2 g) PSS relative to the input so that the tracking error is reduced. Since the signal controlling the operation of key 14 is also an MSS, in which the number of positive elements is approximately -, where N is the number of elements per period of the MSS, therefore, for the MSS period, only half of the time key 14 will be open, i.e. the noise power at the output of the synchronizing correlator will be 2 times less than in known devices, with the same power of the useful signal. The technical and economic efficiency of the synchronization receiver device of the MSS is that the introduction of additional elements provides an increase in tracking accuracy by gating a part of the output signal that does not carry information about the error.

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Claims (1)

SYNCHRONIZATION DEVICE FOR CORRELATION RECEIVER OF PSEUDO-RANDOM SIGNALS, comprising the first and second multipliers combined at the information input of the device, the first integrator connected in series, the first gate amplifier and the phase detector, the second integrator output connected to the second input through the second gate amplifier, the low-pass filter connected in series clock pulses, a pseudo-random signal generator (PSS) and a third multiplier, the output of which is connected to the second input of the second multiplier, and to the second input of the first multiplier, the output of the MSS generator is directly connected, the other outputs of which are connected to the corresponding inputs of the decoder, the output of which through the control unit is connected to the first inputs of the first and second integrators and the second inputs of the first and second gate amplifiers, at the same time, the output of the frequency divider is connected to the second input of the control unit, the input of which is connected to the output of the clock generator, the output of the first multiplier is connected to the second input of the first integrator, and the output of the phase detector is connected to the input of the low-pass filter, characterized in that, in order to increase the tracking accuracy, an element is NOT inserted into it and the adder is connected in series modulo two, a shift register and a key whose output is connected to the second input of the second integrator, and the second input is connected to the output of the second multiplier, the output of the element is NOT connected to the second input of the shift register, and the input is combined with the second input of the third multiplier and connected to the input of the generator P SS, the additional output of which is connected to the first input of the adder modulo two, to the second input of which the output of the MSS generator is connected. SU „„ 1069182