SU1385112A2 - Ionospheric sounding station - Google Patents

Abstract

This invention relates to a radio location. The purpose of the invention is to improve the accuracy of measuring the amplitude of signals by eliminating the non-uniformity of the receiver’s amplitude response and mismatching its input with the antenna feeder. The device contains antenna 1, transmitter 2, receiver 3, synchronizer 4, synthesizer 5, directional coupler 6, meter 7 coefficient. reflection multiplier 8, difference amplifier 9, meter 0 output power. A voltage driver (FN) I1 is introduced, the input to which is connected to the 2nd synchronizer output, and the output is connected to the Z input of the amplifier 9. FN 11 produces voltage to control the coefficient. amplification amplifier 9. The magnitude of this voltage should correspond to the frequency response of the receiving path. The frequency response is taken experimentally before sounding. 1 im. V t

Description

The invention relates to radiolocation, is used in the study of the physical properties of the ionosphere and is an improvement of the invention.

The aim of the invention is to improve the accuracy of measuring the amplitude of the signals by eliminating the non-uniformity of the amplitude-frequency characteristic of the receiver and the mismatch of its input with the antenna feeder.

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

The device comprises a transmitting antenna 1, a transmitter 2, a receiver 3, a synchronizer 4, a synthesizer 5, a directional coupler 6, a reflectance meter 7, a multiplier 8, a difference amplifier 9, an output power meter 10 and a voltage driver 1.

The station operates as follows.

The synthesizer 5 frequencies generates both the frequency emitted by transmitter 2 and the heterodyne frequency of receiver 3. Transmitter 2 emits probing radio pulses. Receiver 3 performs reception, processing and recording of reflected signals,

A directed hole 6 causes the voltage U to be straight.

Noah and

etc

and reverse

waves in meter 7 these

the stresses are detected and the reflection coefficient p is determined according to

“And„ p / i, 5p

- The voltage corresponding to p is squared and supplied to multiplier 8, the second input of multiplier B and meter 10 is supplied with voltage proportional to the output power of transmitter 2, the output signal of multiplier 8 is fed to one of the inputs of differential amplifier 9, to the second input whose voltage is proportional

output POWER, and the third input - the voltage generated in the driver P according to the amplitude-frequency characteristic of the receiving path.

The output voltage of the differential amplifier 9 is equal to

and R. l., K (R j, -r)

with

Yu

15

20

25

thirty

35

40

ate

45

five

where K is the proportionality coefficient, depending on the voltage applied to the amplifier 9 from the imaging unit 11, on the amplifying capacity of the receiving path at the radiated frequency (the receiving path means: antenna feeder - the radio receiver path to the output of the low frequency amplifier).

A voltage Up proportional to the transmission power and amplification capabilities of the receiving path is supplied to receiver 3, where it is used to adjust the amplitude of the reflected signals in accordance with the change in the transmission power level and amplification capabilities of the receiving path in the frequency range: if the resulting effect changes radiated (transmitted) power and amplifying abilities of the receiving path by the magnitude of the amplitude of the reflected signals is such that this value is greater than a certain nominal, then The transmit rate of the receiver 3 decreases; if less, it increases.

The duration of the pulses produced by synchronizer 4 is t, the follow up period is T. The pulses of the first output of synchronizer 4 manipulate transmitter 2, the Amplitude is adjustable, and must be set so that the transmitter 2 can be manipulated, i.e. , depending on the type of transmitter 2, the value of the amplitude of the pulses should be set.

When a pulse arrives in synthesizer 5 from synchronizer 4 of the first ionospheric station, the synthesizer 5 feeds to the second input of transmitter 2 and receiver 3 an oscillation with frequency f ,, radiated by transmitter 2 and used by receiver 3 as a heterodyne wave. from the synchronizer 4 to the synthesizer 5, the latter supplies to the second input of the transmitter 2 and the input of the receiver 3 an oscillation with a different frequency f, and t, e. This is the radiation of radio pulses of different frequencies.

The pulses from the BTOpdro of the synchronizer output are fed to the input of the voltage generator 11.

The third output of the synchronizer 4 as in the prototype is connected to the first input of the receiver 3, Upon receipt

the pulse from the third output of the synchronizer 4 to the first input of the receiver 3 is locked for time 1. The magnitude of the pulse voltage must be sufficient to completely lock the receiver 3.

A voltage shaper 1-1 generates a voltage to control the gain factor K of the difference amplifier. The magnitude of this voltage should correspond to the amplitude-frequency characteristic (AFC) of the receiving path. The ACh of this path of the ionospheric station is removed experimentally before the sounding.

Let, for example, the radio pulse, fifth from the beginning of sounding, has a filling frequency f ,. According to the previously measured frequency response of the receiving path at this frequency, the path gain factor is 2 times less than the nominal one. This means that in order to eliminate the influence of the receiving path on the sounding result, it is necessary, when probing at the frequency f, to artificially increase the amplifying capacity of the receiver 3 by a factor of 2. In order to take into account the frequency response, it is proposed to vary the gain of the difference amplifier 9, and, consequently, the receiver 3, depending on -from the previously studied frequency response of the receiving path.

From the beginning of the probe pulse in the binary counter driver 11 corresponds to the code 0101.

Claims (1)

To change the difference coefficient K the amplifier 9 is required to supply a voltage of 2.5 V from the driver. In order for the driver 11 to have a voltage of 2.5 V, code 11001100 must be applied to its input (for example). In order for the code to be exactly like this, when programming the EPROM (encoder) we establish a correspondence: the input code 0101 corresponds to the output code 11001100, the correspondence for other cases is similarly established. Invention Formula Ionosphere station auth. No. 907491 is distinguished, so that, in order to improve the accuracy of measuring the amplitude of signals by eliminating the unevenness of the amplitude-frequency characteristic of the receiver and the mismatch of its input with the antenna feeder, a voltage driver is input, the input of which is connected to the second synchronizer output and the output connected to the third input of the differential amplifier.