SU794573A1 - Geodetic phase radio ranging system - Google Patents

Description

the carrier torus, the output of the low-frequency generator of a fixed frequency is connected to the second input of the single-band mixer.

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

The geodetic phase measurement system at the master station includes a frequency control unit 1, a crystal oscillator 2, a carrier frequency generator 3, an antenna feeder path 4, a mixer 5, an intermediate frequency amplifier 6, a decoding unit 7, a frequency detector 8, an amplitude detector 9, a phase meter block 10; at the slave station, the antenna-feeder path 11, the carrier frequency generator 12, the mixer 13, the intermediate frequency amplifier 14, the amplitude detector 15, the frequency detector 16, the single-band mixer 17, the coding unit 18 and the low-frequency generator 19 of a fixed frequency.

The system works as follows. The oscillation scales of the 1m frequency, set in the quartz oscillator 2 of the master station, installed by the frequency control unit 1, enter the microwave frequency carrier oscillator 3, where frequency-modulated carrier frequency / n oscillations occur. Using the antenna-feeder path 4, these oscillations are radiated direction of the slave station, and partially fall on the microwave mixer 5 of its station.

Received at the slave station using the antenna-feeder path 11, these oscillations are first mixed with the unmodulated oscillations of the microwave generator 12 of the carrier frequency of the slave station, the frequency of which / n differs from the corresponding carrier frequency of the master station by the intermediate frequency / pr / ng -fsi As a result of the interaction of the noted microwave oscillations at the output of the mixer 13, oscillations of the intermediate frequency fnp, frequency modulated by oscillations of the scale frequency and amplified by the amplifier 14, are extracted KSR frequency.

Using the frequency detector 16 at the output of the latter, oscillations of the scale frequency / m are input to the single-side mixer 17, to which the low-frequency oscillations F from the low-frequency generator 19 of a fixed frequency are simultaneously applied. The single-band mixer 17 serves to oscillate frequency difference / m-F, which is fed to the slave station's microwave generator for transmission in the form of frequency-modulated microwave oscillations to the master station. Along with radiation, these same oscillations fall on their own microwave mixer 13, where they are mixed with frequency-modulated oscillations arriving

from the leading station. As a result, beats with a frequency F occur at the output of the mixer 13, i.e., the oscillations amplified by the IFA slave station are modulated both in frequency with the scale frequency / m and in amplitude with frequency P. In accordance with the principle of operation of the incoherent phase radio rangefinder oscillations with a frequency F, detected by the amplitude detector 15, must be transmitted to the master station. For this purpose, the low-frequency oscillations from the output of the amplitude detector 15 are fed to the coding unit 18, which in the 15th particular case can be an auxiliary frequency generator / b, adapted for performing frequency modulation. Using the coding unit 18, the low frequency oscillations are converted to FM 0 and the auxiliary frequency oscillations / b are fed to the microwave carrier frequency generator 12. In the form of carrier frequency oscillations with double frequency modulation fn, ± / ± F, this information is transmitted to the master station.

The receiving device of the master station, at the input of which, like the slave station, also includes the microwave mixer 5, simultaneously receives both FM oscillations from 0 of its own microwave generator / n, - / m and received from the slave station, which are modulated frequency oscillations with frequency / m-F, as well as frequency-modulated oscillations of the auxiliary frequency f3 ± F. As a result, at the output of the mixer 5, intermediate frequencies modulated in amplitude with a frequency f, and in frequency with a frequency fB ± F, which are fed to amplifier 6 of the intermediate frequency, are separated.

Using the amplitude detector 9, at the leading station, low-frequency oscillations with a frequency F are allocated. Other low-frequency 5 oscillations of the same frequency, relative to which the phase shift of interest to us is determined, are extracted by applying intermediate frequency oscillations to the frequency detector 8, at the output of which FM oscillations of the auxiliary frequency are created, and then a decoding unit 7, which in the particular case may be a second frequency detector, whose central frequency corresponds to the auxiliary frequency / VFazoizmeritelny unit 10, which

two low-frequency oscillations arrive,

is used here to measure the phase rationality by which the magnitude of

0 desired distance.

The main advantage of the considered scheme of a geodetic phase radio-range system compared with the known systems is that when the scale-scale frequency fa is mixed at a non-leading station, the heterodyne frequency of the slave station changes almost instantaneously. As a result, the efficiency and reliability of ambiguity resolution is increased, which is especially important when installing one of the stations of this system on an object moving at a considerable speed, allowing us to expand the operational capabilities of the system.

Claims (1)

1. USSR author's certificate 25 No. 160838, cl. G 01 S 9/56, 1962 (prototype).