SU552718A2 - Device for synchronizing pseudo-noise signals - Google Patents

Description

one

The invention relates to radio and can be used in communication systems using pseudo-noise signals to transmit information.

According to the main author. St. No. 299979, a device for synchronizing pseudo-noise signals, containing multipliers, adder, integrator, controlled oscillator and pseudo-noise generator, is known, the key circuit is connected between one of the multipliers and the p-and-off generator of pseudo-noise generator , integrator and multiplier of the input signal with a signal from the (p-1) -th tap of the pseudo-noise generator 1.

However, the known device reduces the bandwidth of the communication channel, since a part of the channel bandwidth is used for synchronizing information to it.

The purpose of the invention is to improve the accuracy of the device.

To do this, a quad and a multiplier are entered into the device, while the integrator's output is connected via a quad to the threshold node and directly to the first input of the multiplier connected between the second integrator and the controlled generator.

FIG. 1 shows a structural electrical circuit of the proposed device; on

FIG. 2 - discriminatory characteristics. The device contains multipliers 1-4 input and reference signals, the adder 5, integrators 6 and /, quad 8, threshold node

9, a 1U key circuit, a controlled oscillator 11 and a pseudo-noise oscillator 12. The signal inputs of multipliers 1, 2 and 3 are connected to the input of the device, and the inputs of the reference signal, respectively, with (n-2) -m, l-m and (n-1 ) m

cascades of pseudo-noise generator 12, and the pth cascade is connected to multiplier 2 via key circuit 10, the control input of which is connected through threshold node 9, quadrant 8 and integrator 7 to the output of multiplier 3. The outputs of multipliers 1 and 2 are connected to the corresponding inputs of adder 5 , and the output of the adder through serially connected integrator 6, multiplier 4 and controlled oscillator AND connected

with the clock input of the reference pseudo-noise generator 12, and the second input of the multiplier 4 is connected to the output of the integrator 7.

The device works in the following way.

In the search mode, the key circuit 10 is closed and the reference voltage from the output of the pseudo-noise generator 12 is not fed to the input of multiplier 2, and from the (n-2) -th and (p-1) th outputs, the reference voltage is applied to the inputs multipliers 1 and 3.

From the outputs of the integrators 6 and 7, correlation peaks arrive at the inputs of the multiplier 4.

At the time the signals coincide, a time delay at the output of the multiplier 3 causes a voltage sufficient to trigger the threshold node 9. The voltage from the output of the threshold node 9 opens the key circuit 10 and the pseudo-noise reference signal from the p-output of the noise-noise generator 12 goes to the input multiplier 2. In the case of the transmission of a direct pseudo-noise signal, the discriminatory characteristic at the output of integrator 6 has the form shown in FIG. 2, a, at the output of the integrator 7, the correlation peak has the form shown in FIG. 2.6, and in the case of transmitting an inverse pseudo-noise signal, the discriminatory characteristic at the output of integrator 6 and the correlation peak at the output of integrator 7 will look like that shown in FIG. 2, and 2, g, respectively.

As a result of multiplying the input voltages in the multiplier 4, the discriminatory characteristic of the synchronization device will look like that shown in FIG. 2, d both at synchronization on the direct and inverse sequences of the pseudo-noise signal. Thus, an unambiguous adjustment of the reference pseudo-random generator in the search and synchronization mode is provided directly on the working information transmitted by the meander-inverted pseudo-noise signals.

The use of the device allows to exclude the auxiliary synchronization signal and use the entire channel band for transmitting information, which increases the capacity of the device.

Claims (1)

1. Auth. St. No. 299979, cl. H 04L 7/02, 1970 (prototype). yo -t