SU587596A1 - Linear frequency-modulation oscillator - Google Patents

Description

one

The invention relates to radio engineering and can be used in devices used in communication systems, radar, measurement technology.

A linear frequency modulated (chirp) generator is known, which contains a series-connected sawtooth generator, an auto-oscillator, a mixer, a signal conditioner, a functional transducer, a pulse-phase detector, a low-pass filter and an adder whose output is connected to another input of the auto-oscillator, the first reference a generator, the output of which is connected to another input of the Detector, the second reference generator, one output of which is connected to another input of the pulse-phase detector, and the other output of the generator torus sawtooth - to give WMOs synchronizing pulse-phase detector, a functional transducer and a second reference generator l.

However, such a generator has limited functionality due to the presence of a pause in the modulation period,

The purpose of the invention is to expand the functionality by eliminating pauses in the modulation period.

For this purpose, in a generator with chirp, between the output of a pulse-phase detector and another input of the adder, sequentially connected trigger with separate inputs and a time discriminator are introduced, the other inputs of which are connected to other outputs of the second reference generator.

The drawing shows a structural electrical circuit of the proposed generator.

Claims (2)

The chirp generator contains a series-connected sawtooth voltage generator 1, an oscillator 2, a mixer 3, a driver 4 signals, a functional converter 5, a pulse-phase detector 6, a low-pass filter 7 and an adder 8, the output of which is connected to another input of the autogenerator 2, the first reference generator 9, the output of which is connected to another input of the mixer 3, the second reference generator 10, one output of which under:; is connected to another input of the pulse-phase detector 6, and the other output of the generator 1 to the synchronizing The inputs of the pulse-phase detector 6, the functional converter 5 and the second reference generator 10. Between the output of the pulse-phase detector $ and the other input of the adder 8 are connected in series trigger 11 with separate inputs and time discriminator 12, the other inputs of which are connected to the other outputs of the second reference generator 10. The generator operates as follows. At the output of the mixer 3, a beating signal is extracted by multiplying the voltages of the oscillator 2 with the chirp and reference oscillator 9 with a constant frequency. The beat signal from the output of the mixer 3 through the driver 4 enters the input of the functional converter 5, which converts the quadratic law of change of the phase of the beat signal into a uniform impedance o. sequence. Moreover, 3 each modulation period, the functional converter 5 is set to its initial position by synchronization with pulses from the second output of generator G. In the pulse-phase detector (IFD) 6, the temporal position of the pulse sequence of the functional converter 5 is compared with the times By the position of the pulses of the second oscillator 10, and at the output of the IFD 6, the error signal is generated, which is used to adjust the initial frequency and the modulation law. The existing synchronization circuit between the second output of the generator 1 and the corresponding inputs of the IFD 6 and the second reference generator 10 at the moment of the sawback voltage return, sets the zero error signal at the output of the IFD 6 and synchronizes the oscillation phase of the reference generator 10. To obtain the control voltage initial frequency; auto generator 2 serve as trigger 11 and temporal discriminator 12, sign; and the value of the voltage from which is determined by the difference in pulse duration from trigger 11 from the reference duration specified by reference oscillator 10. At the output of the IFD 6, a low-pass filter (LPF) 7 is installed to form a voltage that adjusts the time-linear frequency-modulation law. Both control signals, both adjustments to the initial frequency and adjustments to the modulation law, go to adder 8, from the output of which is "dropped to the control input of the autogenerator 2. The proposed device allows one to obtain a new class of chirped signals, which expands the possibility of using this class of signals in radar, communication systems, and radio altitude, due to the absence of a pause in the modulation period. The claims of the Generator with linear frequency modulation, containing serially connected sawtooth generator, auto oscillator, mixer, signal conditioner, functional transducer, pulse phase detector, low frequency filter and adder, the output of which is connected to another auto oscillator input, first reference oscillator whose output is connected to another input of the mixer, the second reference oscillator, one output of which is connected to another input of the pulse-phase detector, and the other output d sawtooth voltage generator - to the synchronization inputs of the pulse-phase detector, the functional converter and the second reference generator, and with the fact that, in order to improve the functionality by eliminating a pause in the modulation period, between the output of the pulse-phase detector and other the input of the adder is introduced in series connected trigger with separate inputs and temporal discriminator, the other inputs of which are connected to other outlets of the second reference generator .. Sources of information The admission taken into account in the examination: 1.Belov LA, Barabanov V.B., Kochemasov V.N. The system of automatic tuning of the linear in time law of frequency modulation, telecommunications, 1973, 5, p.39. Nn u