SU1051735A1 - Device for receiving angle-modulated signals - Google Patents

Abstract

A CORRECT MODULE SIGNAL RECEPTION DEVICE, containing a gated phase-locked loop (PLL) unit, including at least a phase detector, a low-pass loop filter and a control oscillator, and serially connected synchronization indicator, one input of which is connected to an output tunable synchronous indicator, an output device that can be controlled by a tunable synchronous modulator the PLL unit, and the other input is the input to the device, and the low pass filter is about the same. : In order to improve noise immunity, a key is connected between the output of the synchronism indicator and the gate input of the gated PLL, the output of the low-pass filter is connected to the control input of the low-pass loop filter, between which the output and the control input of the key are turned on the capture indicator, and between the input of the device and the input of the gated PLL unit the delay line is turned on.

Description

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The invention relates to a technique for receiving signals with angular modulation, namely, noise-resistant signal receivers with angular modulation when exposed to strong operation and impulse noise.

Mostly: near the CMI for those: the essence of the invention is a signal device with a global module that contains a gated block. Phase-locked loop frequency (PLL) 10 .c / punchy at-me; re phase detector / loop filter: low frequencies and a generator, and a synchronism indicator connected in series, one input of the cr-.5 of which is connected, to the output of the ldstra::. The frequencies are rotated by the PLL and the OTHER is the input of the device, and the low-pass filter is 1.:

However, this device. possesses insufficient noise immunity.

The purpose of the invention is the preparation of a premise.: 3 6us C TOYCHIVO.STI And. .l .. -: ..:

; - / Set goal is achieved; .., - that in the device otvotvo reception of nalv with angular modulation, with the strobe gated block fazrvj avtopodroykyny. frequency (FAP; H) - ,; including Chayayar. Itself p6; kr; eyn: y; Phase range detector, loop low pass filter and controlled oscillator., and. , 30 after one connected-indicia. Synchronizer clock, one input Which is connected to the output of the adjustable frequency of the gated PLL unit, and the other input is the input of the device, and a low-pass filter between, the output of the indicator, synchronization. The gate input of the PLL block is on the key, the bottom filter output is connected to the low pass filter, which controls the loop input, and the capture indicator is turned on between the output and the control key, and between the input. the device and the input of the gated PLL unit included a delay line. 45

On h: is shown .functional-. on. electrical circuit of the device for receiving signals with modulation.

The device contains a frequency array of phase-locked loop 1 often 50 l.TH - (pLL) including a phase: detector 2 / loop filter 3 low frequencies, controlled oscillator 4 and gate gdrk 5, with gating unit 5 having strobing 55 vyo, vl kvdis gating gate 1 PLL, and depending on the requirements for the implementation of block 1 PLL gating unit 5 may be included on any of the inputs of the phase switch de-. .... tector 2 or between its output and the bottom filter 3 input, the device contains tactile. sequentially connected synchronism indicator 6, one input of which is connected to the output adjustable 65

the frequency of the gated block .1 PLL, and the other input is the input of the device, and the low-pass filter 7, and between the output of the synchronization indicator b and the gate of the gate of the PieMoro block of the PLL, the key 8 of the low-pass filter output 7 is connected to the control input a loop filter 3 of the lower frequencies, between the output of which and the control input of the key 8, the pick-up indicator 9 is turned on and between the device input and the input of the gated PLL unit 1 the 1 € delay line is turned on. . The device receiving signals with angular modulation operates as follows.

The received mixture of the signal having angular modulation and interference is fed to the gated block 1 FALCH via the delay line 10 and directly to the clock signal, 6 synchronization. In the initial state, gating unit 5 is closed, therefore gated block 1 of the PLL enters. synchronization mode; i.e., tracking the angular: modulation of the signal, and demodulates the transmitted co-operation, which, through the loop filter of the 3. Lower frequency, causes output. After the tracking mode is established, the capture indicator 9 triggers, which is controlled by the cry 8, thus preventing signals from the synchronization indicator 6 output. gating input of gated block 1 PLL By connecting the synchronism indicator 6 to the input of the device and the output of the controlled generator 4. high reliability of the detection of a period change of .hour - is provided. ttot: Input Signal prD action, strong fluctuation to impulse signals, while the phase and period of the signal with. control output O91 of oscillator 4: are the expected estimate for the phase and period of the signal, taking into account the modulation. in case of sharp changes in the period of the input signal, the voltage output from the region of permissible values, from the output of the synchronization indicator 6 through. anomalous interferences, while looping low pass filter 3, triggers the control voltage that existed before the changes of the input signal period, since the input signal goes to the gated block to 1 PLL with a delay approximately equal to the time required for detection of the indicated changes by indicator b of synchronism. In the initial period of development, the state of this indicator is not

affects the operation of the gated block 1 PLL, since the indicator 9 capture

I fixes the absence of the tracking mode and forcibly opens the key 8..

In the case of high intensity intensities, V interference and, consequently, with frequent; and sufficiently long breaks and x feedback loops, the parameters of the loop filter 3 of the lower ones are additionally modified in order to oltimatize the factors of the PLL loop; to do this, the voltage from the output of the synchronization indicator 6 is filtered by the low-pass filter-7, which is the average noise-storage aggregate-, after which it enters the entrance |

: control loop filter 3 low pass. ;

The introduction of the key 8, the pickup indicator 9, and the shank line 10 allows detecting and eliminating abnormal phase jumps in the input signal and interference mixture due to the better use of the logging and filtering properties of the next demodulator, which increases the signal immunity of the device angular modulation, since the probability of stalling failure is drastically reduced by increasing the reliability of detection of phaea jumps. in the input signal of adaptive change of inertia and prediction {{their demodic properties -.

5 l of a torus with a change in the intensity of J interference ..

Claims (1)

DEVICE RECEIVING SIGNALS angular modulation comprising block gated phase locked loop (PLL), comprising at least a phase detector, a lowpass loop filter and a controlled oscillator, and posledo- ^- 'sequently connected synchronism indicator, one input of which is connected to the output adjustable frequency of the gated PLL block, and the other input is the input of the device, and a low-pass filter, about t and h a -. In addition, in order to increase the noise immunity, a key is turned on between the output of the synchronism indicator and the gating input of the gated PLL block, the low-pass filter output is connected to the control input of the low-pass loop filter, between the output of which and the key control input capture, and between the input of the device and the input of the gated PLL block the delay line m 00 sl of the frequency of the gated block .1 PLL, and the other input is the input of the device, and the low-pass filter 7, and between the output of the synchronism indicator b and the gating input of the gated block 1 PLL, turn on the key 8, the output of the low-pass filter 7 is connected “to the control input of the loopback low-pass filter 3, between the output of which and the key control input 8, the capture indicator 9 is turned on, and a delay line 10 is connected between the input of the device and the input of the PLL block 1. A device for receiving signals : arrives at the gated PLL block 1 through the delay line 10 and not * 0 directly to the synchronizer, 6 synchronism. In the initial state, the gating unit 5. is closed, therefore, the PLL gate 1 being gated enters the synchronism mode, i.e. tracking 25 angular: modulation of the signal, and demodulates the transmitted message, which through the loop filter 3 of the low frequencies is output. After establishing the tracking mode 30, the capture indicator 9 is activated, which closes the key 8 at the control input, thereby ensuring the passage of signals from the output of the synchronism indicator 6 to. the gating input of the gated PLL block 1. By connecting the indicator b synchronism to the input of the device and the output of the controlled generator 4. high reliability is provided. detection of changes in the frequency period of the input signal under