SU568140A1 - Arrangement for autotuning time-linear frequency modulation law - Google Patents

Description

pen, mixer, driver,, functional converter, pulse phase detector, filtering and correction device and sawtooth generator, with the second input of the mixture; the gel is connected to the output of the local oscillator, to the second input to the pulse-phase detector of the supported generator, and The inputs of the sawtooth generator to onojMioro reirepaTopa are connected to the power source. A control voltage to the control input, between the output of the reference generator and the installation input of the transducer, is connected via a Tri-GWP connected to the voltage sensor and pulse counter, the second input i is connected to the second output of the key, the second input of which is connected to the output of the TfBirrepa; with this, the second input of the trigger and the input of the synchronous reference generator is connected to the output of the niloobrazmengo generator.

In the drawing, the structural scheme of the device is edited.

The device contains included in a frequency-modulated controlled oscillator 1, a mixer 2, a rotator 3 key 4, a functional converter 5, a pulse-phase detector 6, a filtering and correction device 7 and a saw-voltage generator 8, Pr this to the second input of the mixer 2, the output of the local oscillator 9 is connected to the impulse input of the pulse-phase detector 6 — the output of the reference generator lOt and the control inputs of the sawtooth generator 8 and the reference generator 10 are connected to the source and control voltage . Between the output of the reference generator 10 and the installation input of the functional converter 5, serially connected trigger 12 and pulse counter 13 are connected, the second input of which is connected to the second output of key 4 The second input of the switch is connected to the output of trigger f2, the second input of trigger 12 and the synchronization output of the reference generator 10 are connected to the output of the generator 8 sawtooth voltage.

The device works as follows.

The signal from the oscillator voltage generator 8 controlled by the voltage Utf from the source 11 is fed to the frequency-modulated controlled reiceparop 1, the output of which is removed cng al with linear frequency modulation

(Mt. At the output of the signal 2, as a result of stress reduction from the generator 1 and the local oscillator 9, a bonyy signal with a decreasing purity is formed, which through: the forms) (the ram 3 n key 4 enters the function CH1

four

national converter 5, which converts the quadratic change in the phase of the beat signal during linear frequency modulation. in a sequence of pulses with a constant frequency.

The conversion method is to subtract B from each subsequent sampling period of a certain number (for example, 2 from the number in the previous period ;; discretization.

The initial number from which the subtraction is derived is the initial state of the functional transducer.

five.

An error signal equal to the temporal mismatch between the output pulses of the functional converter 5 and the pulses of the reference generator 10 synchronized by the reverse running of the sawtooth generator 8 with the start of modulation is extracted by the pulse-phase RQ detector B and through the filtering and correction device 7 controls the steepness generator 8 sawtooth voltage, adjusting the linearity of the frequency modulation of the oscillator 1.

To minimize transients of the self-tuning ring, the time difference between the first pulse of the functional converter 5 in the period of modulation and the pulse of the reference generator 10 should be minimized. To reach; THIS functional transducer 5 is reset to the initial state in accordance with the frequency of the ijuMe-2 signal at the moment of the start of modulation and the Ve-G rate; 11 periods of the pulses of the reference oscillator 10. The number of cycles of the beat signal at the output of the mixer 2 must be:

“Ihah. -i

I - generator frequency difference

where 1 and local oscillator 9 at the moment of the start of modulation: Fg is the pulse frequency

reference generator 1O. For this purpose, the trigger 12 selects the first period of the signal of the reference gel 10, controlling the key 4, which opens the linear loop auto-tuning ring, and the beating force is fed to the counter 13. Counting.

CHICK fixes the number of CYCLES of the input SI1

The signal for the first period of the signal of the operative generator 1O, which is fed to the installation input of the functional converter 5.

The synchronization of the disputed generator 10 and the start of the trigger 12 occur during reverse;