SU987544A1 - Pulse radio signal processing device - Google Patents

Description

(54) DEVICE FOR PROCESSING PULSE RADIO SIGNALS

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The invention relates to radio engineering and can be used in radar communication systems as a matched filter and correlator of pulsed radio signals.

A device for processing pulsed radio signals comprising a reference signal generator, a first current pulse generator and a series-connected synchronizer, an excitation pulse generator, and a resonant system with a working substance are known, while the second output of the synchronizer is connected to the second input of the resonant system with the working substance through the first generator-, 5 torus of current pulses fl. j However, the known device has no Immunity, due to the presence of a bag of signals arising at the time of the termination of the second reading radio pulse and called the free induction signal (FID).

The purpose of the invention is to increase the noise immunity.

The goal is achieved in that in the device of pulse radio sets containing a reference signal generator, a first current pulse generator and a series-connected synchronizer, an excited pulse generator and a resonant system with the working substance, the second synchronizer output is connected to the second input of the resonant system with the working substance through The first pulse generator current is introduced. A second current pulse generator is inserted between the third synchronizer output and the third input of the resonant system with the working medium, and the fourth output of the synchronizer is connected to the fourth input of the resonant system with the working substance through the generator. reference signals.

Claims (1)

FIG. 1 shows the structural electrical circuit of the proposed device; in fig. 2 - timing diagrams, to explain the operation of the device. The device for processing pulsed radio signals contains a synchronizer 1, a generator 2 of excitation of the impulses of a resonant system 3 with a working substance, a first generator of 4 current pulses, a generator of 5 reference signals and a second generator of 6 current pulses. The signal to be processed is fed to the resonant system 3 with the working substance through terminal 7, and the output signal is taken from terminal 8. The pulse radio signal processing device operates as follows. At the moment, the synchronizer 1 starts the generator 5 of the reference signals, from the output of which the reference signal 9 arrives at the resonant system 3 with the working substance (Fig. 2q). If the spectrum of the reference signal is Son (t) then I will. When applied to the resonant system 3 with the working substance first in time, it is inverted by the spin system into the conjugate spectrum of the second one, which then multiplies the spectrum of the processing signal. In this case, there is no need for a two-step procedure using an inversion channel. At the end of the reference signal 9, the synonizer 1. at the moment b, starts the second generator 6 current pulses, which extracts the current pulse 10 (Fig. 2a), which creates in the working substance of the resonant system 3 a change in the precession frequency of electron or nuclear spins, which leads to the change in phase relations for the HbEs elementary magnet moments. Then, at the instant –fc, a signal 11 is sent to the terminal 7 of the resonant system 3 with the working substance, to be processed (Fig. 2C), and whose QQ is. Pb - At the end of signal 11, synchronizer 1 starts the first generator of 4 current pulses, producing a current pulse 12 at the moment-fc4 (Fig. 2C1), which changes the precession frequency of the electron or nuclear spins in the working substance of the resonant system 3. At the moment the pulse ends 12, the synchronizer 1 starts a generator of 2 excitation pulses, which produces a short 90-degree radio pulse 13 (Fig. 20), iio arriving at the resonant system 3 with the working substance. At the end of this pulse, synchronizer 1 starts the second generator of 6 current pulses, you work in NIOMGHT -t current pulse 14 (Fig. 2a), id (1 O pulse). After at t -f- -L on the output terminal 8 is the output signal 15 (Fig. 2c |) in the form of the mutual correlation of the jaw function of the reference 9 and the signals being processed 11. At the same, the FID, which remains when using one current pulse (Fig. 2 (5), is suppressed. To suppress the FID 16, the impulse is used current 14 from the second generator 6 current pulses, violating the phase ratio required for However, this pulse 14 also violates the phase relations necessary for the formation of a three-pulse (echo) output signal 16. The second generator 6 current pulses generates a current pulse 10 at time t 3 for ignoring these ratios 14. In this case, the amplitude of the three-pulse echo is not reduced. The connection of the first and second generators 4 and 6 with the working substance of the resonant system can be accomplished as with the help of two independent bias coils (comprising oh System 3) and via coils (ibid). In the latter case, the first and second generators 4 and 6 operate on a common load. The working substance can be used as a ferromagnetic substance that does not require a constant external polarizing magnetic field, or non-magnetically ordered materials using external polarizing magnetic fields. If the device operates as a matched filter as a matched radio station, then (radio pulse) the reference signal 9 from the 5 reference signal generator is a signal from the radar probe signal generator (not shown), and the processed signal 11 is a combination of noise and reflected signals on the range of the corresponding delays oTfciVMiH to Swa-n FIG. 2-5, c). A comparative analysis of the known and proposed devices has shown that the proposed device provides the output ratio of the signal – noise M NO in this case, the gain in noise immunity is} times, where EU is the energy of the reflected signal; ., is the spectral power density of the noise; c-Ct) is the loss coefficient depending on the delay of the reflected signal, moreover; (ex-t)) –UEon C) t where the noise dispersion at the input of the resonant network 3; d - reference signal energy at the output of a resonant system 3 The invention Invention device for pulse radio signals containing a reference signal generator, a first current pulse generator and is switched on in series Tj Fig.1 7 8 AGE synchronizer, excitation pulse generator and resonant system with a working substance; the second output of the synchronizer is connected to the second input of the resonant system with the working substance through the first current pulse generator, characterized in that in order to increase the noise immunity, a second generator is introduced current pulses connected between the third output of the synchronizer and the third input of the resonant system with the working substance, and the fourth output of the synchronizer is connected to the fourth input of the resonant system with working substance through the reference signal generator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 7776О7, cl. GO1 S 7/28, published on 07.11.8O. (prototype).