RU70427U1 - STATION FOR RECEIVING INFORMATION FROM EMERGENCY RADIO BEAMS OF THE SPACE SEARCH AND RESCUE SYSTEM - Google Patents

Abstract

The station for receiving information from emergency beacons of the space search and rescue system includes an antenna post on which an external receiver is located, navigation receivers of the global navigation satellite system, analog-to-digital receivers, computer system units, an on-board signal source simulator, switch-router, console switch, uninterruptible power supplies, as well as the operator’s workplace. The navigation receiver of the information receiving station is a combined GPS / GLONASS receiver. The antenna post is equipped with a guidance and auto tracking system. The guidance and auto tracking system is connected to the outputs of the main and backup computing units and is configured to program or manually aim the antenna. An external receiving device is connected to the output of the on-board signal source simulator. The proposed technical solution will provide, with continuous round-the-clock operation, the required characteristics of signal detection from emergency beacons of the space search and rescue system, relayed by the on-board radio-technical complex of the Geostationary Satellite "Electro-L", and the transmission of reliable information to the international coordination and computing center of the system. 4 cp, 2 ill.

Description

The proposed technical solution relates to space communications technology and can be used in space search and rescue systems to receive signals from emergency radio beacons of the COSPAS-SARSAT system retransmitted by the airborne radio complex of the geostationary artificial Earth satellite and transmit reliable information to the focal point of the system.

A known station for receiving information from emergency beacons GEOLUT, designed to receive and process signals from emergency beacons ARB-406, relayed through geostationary spacecraft and transmit reliable packages to the focal point of the system. The GEOLUT station includes: a parabolic antenna, a band-pass filter and a low-noise amplifier with a frequency converter down, placed on the antenna, a GEOLUT 600 model processing unit, including an analog-to-digital receiver, a navigation receiver for the global GPS navigation satellite system, and an interface with the focal point of the system. Antenna guidance is manual.

A description of the GEOLUT station is given on the manufacturer's website www.ems-t.com. The technical characteristics of the GEOLUT station are defined by the document of the International COSPAS-SARSAT C / S T.009 system “Specifications and guidelines for the construction of a ground station for the GEOLUT reception of the COSPAS-SARSAT system”. The device of the GEOLUT station according to the functional structural diagram is the closest to the proposed technical solution and is selected as its closest analogue.

The main drawback of the GEOLUT station is the presence of only manual pointing of the receiving antenna to the artificial Earth satellite, which will greatly complicate the antenna pointing to the Electro-L geostationary satellite after three years of use. Also, the disadvantages of the known station for receiving information include high cost.

The proposed technical solution allows to eliminate the listed disadvantages of the GEOLUT station. As a result, the proposed station for receiving information from emergency radio beacons SPIAB will allow to detect signals from emergency radio beacons (ARB-406), relayed by the Geostationary Satellite "Electro-L", with continuous round-the-clock operation of the station and programmed guidance to the geostationary satellite during lunar-solar precession of the satellite.

The technical result expected from the use of the proposed design will be achieved by the fact that a station is proposed for receiving information from emergency beacons of the space search and rescue system, including an antenna post, external receivers, navigation receivers of global navigation satellite systems GPS / GLONASS, analog-to-digital receivers, computing system units, switch-router, console switch, secondary and uninterruptible power supplies, as well as the operator’s workplace. External receivers, analog-to-digital receivers, computer system units, as well as secondary and uninterruptible power supplies include a backup set of equipment. The outputs of the primary and backup external receivers are connected respectively to the inputs of the primary and backup analog-to-digital receivers. The primary and backup analog-to-digital receivers are connected to the primary and backup computing system units, respectively. The primary and backup computing system units are connected respectively to the primary and secondary navigation receivers and through the switch-router to the control device

antenna post, as well as through the console switch and switch-router with the operator’s workplace. In addition, a simulator of an on-board signal source was introduced into the station, the output of which is connected to the input of a low-noise amplifier, which is part of an external receiving device, and the input is connected to a computer system unit. In contrast to the known technical solution, the proposed station for receiving information from emergency beacons uses combined GPS / GLONASS receivers as navigation receivers. Also, unlike the known technical solution, the antenna post is equipped with a guidance and auto tracking system connected to the outputs of the main and backup computing units and configured to program or manually point the antenna.

Also, computing system units are connected to external information processing complexes through a switch-router. External information processing complexes are the International Coordination and Computing Center (ICCC) and the ground-based complex for receiving, processing and disseminating information (NKPOR).

Primary and backup analog-to-digital receivers, primary and backup computing system units, primary and backup navigation receivers of the global navigation satellite system, guidance and auto tracking system, primary and backup secondary power sources, primary and backup uninterruptible power supplies, on-board signal source simulator and operational operator’s place is located in a single room of a hardware station for receiving and processing information from emergency beacons.

The operator’s workplace is equipped with a monitor, keyboard, mouse manipulator, which are connected to the main and backup computing system units via a console switch. Also in working

The operator’s place includes a printer, which is connected to the main and backup computing system units through a switch-router. The proposed technical solution is illustrated by drawings:

figure 1 is a structural diagram of a station receiving information from emergency beacons;

figure 2 is a structural diagram of a computer complex station receiving information from emergency beacons.

The station for receiving information from emergency beacons (Fig. 1) includes an antenna post 14 equipped with a guidance and auto tracking system 15, an external receiving device 12 consisting of a primary and backup low-noise amplifiers and a primary and backup bandpass filters, combined GPS / GLONASS navigation receivers ( primary 1 and backup 2), analog-to-digital receivers (primary 7 and backup 8), computer system units (primary 9 and backup 10), on-board signal source simulator 16. Also SPIAB station includes second sources ary power (main and back-up 3 4), uninterruptible power supplies (main and 5 reserve 6), the switch-router 11, the console switch 17. Operator 18 is equipped with a monitor, keyboard, manipulator "mouse" and the printer. Functional devices included in the information receiving station that are constantly in use in the equipment room, with the exception of devices located at the operator’s workplace, are enclosed in a reception and computing rack 20. All radio-electronic equipment of the through path for receiving, detecting, isolating and processing emergency information station messages duplicated. The components of the proposed SPIAB station are built primarily from purchased standardized products, which will significantly reduce the cost, terms of its development and equipment delivery.

The software package is an important system-forming part of the station receiving information from emergency beacons.

The station software provides the solution to the problems of continuous round-the-clock reception and processing of messages from ARB-406 beacons of the COSPAS-SARSAT search and rescue system received from an analog-digital receiver (7 or 8), the selection and transmission of reliable messages to the international coordination and computing center (ICCC ) and the transmission of information about the operability of the SPIAB station to the ground-based complex for receiving, processing and distribution (NKPOR). Also, the station software provides management and control of technical means and archiving of SPIAB station information.

The antenna post 14 receives signals transmitted by the geostationary artificial Earth satellite 13, phase modulated by the relayed signals of the emergency beacons. The external receiving device 12 is connected to the irradiator of the antenna post 14 and is hardware-based on the main and backup bandpass filters and the main and backup low-noise amplifiers, which structurally include directional couplers for connecting to the simulator of the onboard signal source 16, and provides preliminary signal amplification and filtering from industrial interference. Antenna post 14 is advisable to use either in manual or software guidance mode. Manual guidance is used to set the initial direction of the antenna to the geostationary artificial Earth satellite 13 according to the maximum signal from the output of the analog-to-digital receiver (7 or 8). After such installation, the antenna post 14 should operate in this mode until the geostationary artificial Earth satellite 13 maintains its nominal position in the geostationary orbit. After the working fluid has been used to maintain the inclination of the orbit of the artificial Earth satellite 13, the inclination of its orbit will constantly increase due to the influence of attraction from the Moon and the Sun (lunar-solar precession of the orbit of the geostationary satellite). The position of the artificial Earth satellite 13 on the celestial sphere will describe

the so-called "eight". For subsequent tracking by the antenna post 14 of this G8, it is sufficient to use the software guidance mode of the antenna post, which will be provided with a guidance and auto tracking system 15 according to information from the software package.

The main 7 and standby 8 analog-to-digital receivers are analog-to-digital devices and provide reception and primary processing of signals from emergency radio beacons ARB-406 relayed by geostationary artificial Earth satellites 13. An analog-digital receiver (7 or 8) solves the problems of detection and phase synchronization by a carrier signal, estimation of its parameters (frequency and energy potential), signal demodulation and band pass filtering of a demodulated subcarrier signal, which is an additive mixture noise of the airborne receiver with relayed signals of emergency beacons, in order to isolate reliable information packages by accumulating the signals of several packages from one beacon and generating estimates of the parameters of the corresponding signal, time-bound. The signal from the main or standby low-noise amplifier is fed to the input of an analog-to-digital receiver (7 or 8). By double frequency conversion, the signal frequency is reduced, after which the signal is cut off in a strip and digitized. All further signal processing is carried out digitally. The results of the current signal processing are collected in information packets and transmitted via USB to the computer system unit (9 or 10), where the final signal processing is performed. To control the devices, the RS-232 port is used.

Computing system units (main 9 and backup 10) are designed to solve the problems of receiving, processing and issuing information to consumers. The information packets received by the USB port of the computing system unit (9 or 10) are stored in the buffer of the computing unit, the capacity of which allows saving at least 6-8 packages from

one emergency beacon. Next, primary detection of the useful signal is carried out, formation of estimates of its frequency and power, tied to the current time. Combined GPS / GLONASS navigation receiver (primary 1 or backup 2) provides binding of messages of the computing system unit to a single time scale (Moscow time).

The signal strength from the emergency beacon determines the minimum number of accumulated packages for a given beacon, and the frequency-time window parameters are formed from the estimates of the frequency and time of detection of the package to determine whether the next received packages belong to this emergency beacon. Upon reaching the required number of received parcels, the summation of the signals of these parcels is carried out by processing the entire set of "as a whole". The information package extracted as a result of summation is checked by the BCH software decoder. If the required reliability of the selected information sequence is obtained, then the information package is transmitted for further processing to the SPIAB Program Complex with the aim of creating an output format with a reliable package for delivery to the international coordination and computing center. Otherwise, the next package is received and the summation procedure is repeated using the generated estimates of the signal parameters of the previous packages. The speed of the computing system unit (9 or 10) is such that it allows the implementation of algorithms for detecting, measuring parameters, demodulating and accumulating signals simultaneously and independently of at least twenty emergency beacons, taking into account the independence of their carrier frequencies and moments of radiation.

The simulator of the on-board signal source 16 is used for debugging and autonomous tests, as well as for monitoring the operation of the station receiving information from emergency beacons during its operation. Functioning

simulator onboard signal source is as follows, described below. The computing system unit calculates the digital values of the samples of the ARB-406 signals mixed with the noise of the receiver of the onboard repeater of these signals in the range of its output frequencies. A digital-to-analog converter converts these values into an analog signal, which is fed to the input of a phase modulator of a signal generator. The signal generator meets the requirements for metrological equipment, and is able to accurately simulate the signal at the output of the signal relay of the emergency beacon of the onboard radio complex. The operation of the signal generator and the change in the parameters of the generated signal (carrier frequency, output power, phase modulation index) are controlled by the computer system unit via the RS-232 interface.

Thus, the proposed technical solution for constructing a station for receiving information from emergency beacons of the space search and rescue system will provide, with continuous round-the-clock operation, the required detection characteristics of signals transmitted from emergency beacons relayed through the Geostationary Satellite Electro-L, isolating the information contained in them and transmitting reliable information to international coordination and computing center.

Claims (5)

1. A station for receiving information from emergency beacons of the space search and rescue system, including an antenna post on which an external receiving device is located, the main and backup navigation receivers of the global navigation satellite system, the primary and backup analog-digital receivers, the primary and backup computing system units, on-board signal source simulator, switch-router, console switch, primary and backup uninterruptible power supplies, operator workstation, at the outputs of the external receiver are connected to the inputs of the main and backup analog-to-digital receivers connected, respectively, to the main and backup computing system units, the inputs of which are also connected to the main and backup navigation receivers, respectively, the main and backup computing system units are connected to the onboard simulator the signal source, and through the switch-router with the antenna post, as well as through the console switch and the switch-router with the working month om operator, characterized in that the navigation receivers are combined GPS / GLONASS receivers, the antenna post is equipped with a guidance and auto tracking system connected to the outputs of the main and backup computing system units and configured to program or manual antenna pointing, and the output of the onboard signal source simulator is connected with an external receiver. 2. The station for receiving information from emergency beacons of the space search and rescue system according to claim 1, characterized in that the main and backup computing system units are connected via an exchange-router to an international coordination and computing center and a ground-based complex for receiving, processing and disseminating information. 3. The system for receiving information from emergency beacons of the space search and rescue system according to claim 1, characterized in that the primary and backup analog-to-digital receivers, the primary and backup computing system units, the primary and secondary navigation receivers of the global navigation satellite system, the primary and backup uninterruptible power supplies, a simulator of an onboard signal source and the operator's workplace are part of a single hardware room of a station for receiving and processing information from emergency beacons . 4. The system for receiving information from emergency beacons of the space search and rescue system according to claim 1, characterized in that the operator’s workstation includes a monitor, keyboard, mouse, connected to the main and backup computing system units via a console switch, and a printer, connected to the main and backup computing system units through a switch-router. 5. A system for receiving information from emergency beacons of a space search and rescue system according to any of the preceding paragraphs, characterized in that all the constituent elements of the information receiving station are standardized products.