CN102769490A - Satellite mobile voice communication system with extra-low speed - Google Patents
Satellite mobile voice communication system with extra-low speed Download PDFInfo
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Abstract
The invention discloses a satellite mobile voice communication system with an extra-low speed, and relates to the satellite technology. The satellite mobile voice communication system with the extra-low speed based on a forwarding type satellite navigation system can be built by taking advantages of GEO (geostationary orbit) communication satellite resources (or other satellite resources) in the current forwarding type satellite navigation system, adopting a speech compression coding with the extra-low speed and a ground mobile voice communication network technology, and determining a communication system, signal characteristic and a system composition of the satellite mobile voice communication through an optimized design of satellite channel, a microminiature satellite terminal and an optimized design of ground network control technology. The system provided by the invention has the advantages of system resource sharing, flexible and effective network and combined navigation and communication capability, and can provide a low-cost voice communication application service and can be applied to an air-ground emergency communication system and a measurement system with small data volume demand.
Description
Technical field
The present invention relates to the satellite technology field, be based on the satellite moving speech communication system of the utmost point low rate of relay type satellite navigation system.
Background technology
Existing satellite navigation system comprises a Big Dipper generation, GPS of USA and the Muscovite GLONASS navigation system of China, and these systems are except that triones navigation system has the short message communication function, and other system does not all provide communication function.Need to combine satellite communication network satellite resources such as (as: marisat system, iridium satellite communication systems) or ground communication net resource to realize communication function.
The major technique characteristics of each system are:
1) Big Dipper generation navigation system
Big Dipper generation satellite navigation system is the global position system that China develops voluntarily, and Big Dipper generation satellite navigation system is made up of space segment, ground segment and user segment three parts, and space segment comprises 3 GEO satellites.Ground segment comprises several ground stations such as master station, injection station and monitoring station.User segment refers to Big Dipper user terminal.The Big Dipper adopts the response mode location, the code division multiple access system, and working frequency range adopts the S+L+C wave band, and system can provide location, brief digital message communication and time service service etc. for the user.
2) GPS Global Navigation System
GPS is the most successful satellite navigation system that puts into operation.Space segment is made up of 24 middle rail orbiters and 3 backup satellites, and orbit altitude 20200km is evenly distributed on (4 of each orbital planes) on 6 orbital planes, and orbit inclination angle is 55 °.Ground control system is made up of monitoring station, main control station and ground-plane antenna.Adopt passive location, the code division multiple access system, spreading code adopts thick sign indicating number of civilian C/A and the smart sign indicating number of military P, and frequency range is selected L-band for use, high accuracy worldwide navigation location can be provided, test the speed and the time service service, but not have communication function.
3) Muscovite GLONASS navigation system
GLONASS is the satellite navigation system of independently being developed by Russia, and constellation is made up of 30 satellites altogether.1.91 ten thousand kilometers of orbit altitudes.Ground support system is made up of System Control Center, central synchronization device, remote measuring and controlling station (containing the Laser Tracking station) and outfield navigation control device.System adopts the frequency division system, and frequency range is selected L-band for use, channel spacing 0.5625MHz.High accuracy worldwide navigation location can be provided, test the speed and the time service service, but not have communication function.
In many applications; Effective utilization of user's navigator fix information needs other means of communication to assist completion; Therefore, navigation system need combine other satellite communication network (like marisat system and iridium satellite communication system) or ground communication net to realize communication function usually.The relay type satellite navigation system is the satellite navigation and location system of Chinese Academy of Sciences's independent research; It utilizes existing GEO communication satellite to realize navigation locating function as the satellite navigation constellation; Owing to have a large amount of transponder resources to utilize on these communication satellites, so developed utmost point low rate (300～2400bps) satellite moving speech communication system.
Summary of the invention
The object of the invention discloses a kind of satellite moving speech communication system of utmost point low rate; Be to utilize in the relay type satellite navigation system, and voice communication and ground voice communication network technology realize utmost point low rate (300～2400bps) satellite moving speech communication in the GEO of rail communication satellite resource.It has characteristics such as small investment, the lead time is short, system's composition is flexible, use cost is low; And the communication area coverage is wide; Do not receive geographical environmental condition and weather condition restriction, be specially adapted to the services such as emergency command, liaison and information transmission in the emergency communication.
A kind of satellite moving speech communication system of utmost point low rate comprises space segment, ground segment and user segment; Its space segment utilizes the transponder of the GEO communication satellite of relay type satellite navigation system, and communication system adopts spread spectrum communication mode;
Ground segment is the ground communication central station, adopts the heavy caliber parabolic antenna to solve the low problem of the weak EIRP with communication satellite of Incoming signal, to satisfy the requirement of satellite link; Communication report center is responsible for distributing to portable terminal to all satellite channel resource as network coordinating station (NCS) and uses; And carry out Various types of data exchange through PSE and ground common communication network users, realize interconnecting of mobile subscriber and public network user in system's net;
User segment comprises portable, vehicle-mounted or boat-carrying voice communication portable terminal, is miniaturization, low-power consumption; The terminal equipment that transmitting power is little; For vehicle-mounted or Shipborne terminal, adopt easy servo tracking system that satellite is followed the tracks of, antenna adopts parabolic antenna or panel antenna array.
The satellite moving speech communication system of described utmost point low rate; Its said ground communication central station; Comprise antenna feeder and servo, transmit and receive, clock synchronization and power subsystem; With baseband modulation and demodulation and radio frequency frequency conversion amplification and the emission reception of accomplishing satellite-signal, its parabolic antenna bore is 9～16 meters;
The editing equipment management subsystem of ground communication central station is accomplished earth station equipment monitoring operation maintenance, equipment disposition and ground station's safety management;
The ground network control and management subsystem of ground communication central station is accomplished network configuration, user management, system's control, charging financial management, authentication management and voice data exchange management work.
The satellite moving speech communication system of described utmost point low rate, the voice communication portable terminal of its said user segment comprises antenna, transmitting-receiving radio frequency component, transmitting-receiving base band, vocoder and Terminal Control Element, and its transmitting power is 1～10W, and power consumption is 5～10W; The used parabolic antenna bore of vehicle-mounted or Shipborne terminal is 0.45 meter, and the emission/receiving gain of antenna is 25/22dB.
The satellite moving speech communication system of described utmost point low rate, it adopts three kinds of communication work modes:
1) two way voice communication between mobile phone users and the ground station;
2) mobile phone users-between ground station-mobile phone users, communicate by letter in system, carries out voice communication between the mobile communication terminal user, transmit through ground station and accomplish through the satellite double bounce;
3) mobile phone users and ground public network telex network, the switching equipment through ground station interconnects with the ground public communication network and to communicate by letter.
The satellite moving speech communication system of described utmost point low rate, its channel allocation mode is distribution according to need, the demand assigned calling procedure is following:
1) call setup: the calling party through control channel earthward communication report center send call request information; Central station is being confirmed under the idle condition of satellite channel and called party instrument; Distribute satellite channel to calling party and callee; Calling party and callee carry out continuity test, set up circuit through central station;
2) conversation: after circuit was set up, communicating pair can be conversed or transfer of data;
3) take out stitches: behind the end of conversation, by calling party or the callee of conversation earthward communication report center send end of conversation information, ground station beams back and confirms and recover satellites channel and subscriber channel.
The satellite moving speech communication system of described utmost point low rate, its speech coding adopts voice compression technique, and information rate is 300～2400bps, makes transmission link obtain bigger coding spread spectrum gain.
The satellite moving speech communication system of described utmost point low rate; Its departures broadcast channel adopts the FDM/CDMA/S-ALOHA mode, and the CDMA/S-ALOHA system is adopted in inbound passback, and modulation system adopts QPSK or BPSK; The I branch road transmits signaling data, and the Q branch road transmits speech data.
Technical characterstic of the present invention:
1) existing communication satellite resource in the present invention's relay type satellite navigation system capable of using need not be launched the private communication satellite separately, realizes not receiving the restriction of geographical environment and time; There is the communication of big regional extent to cover; Emergent voice communications services can be provided, have small investment, the construction period is short; Characteristics such as use cost is low, and networking is simple;
2) portable terminal of the present invention adopts low power dissipation design, and transmitting power is little, and antenna adopts high-gain excipient antenna also to have easy servo-control system, satisfies the specification requirement to the servo tracking of antenna of car, boat-carrying, the terminal low cost of manufacture.
3) ground station of the present invention central station can be used as network coordinating station, and the satellite mobile voice terminal use in netting is carried out dynamic management, specialized designs network managing mode in the system.Also can be used as simultaneously juncture station, network interface and agreement adopt the communication protocol and the interface of the public network of standard, can interconnect with data network, telephone network and the wide area network of public network.
4) the present invention have system be easy to the expansion; Except that voice communication outside the function; Services such as data message, image transmission can also be provided, and it has navigation communicating integral function, and the service of user time and position and the value-added service application service of every profession and trade user management can be provided.System uses economical rationality, system integration networking flexibility.
Description of drawings
Fig. 1 is a kind of utmost point low rate satellite moving speech communication system schematic of the present invention;
Fig. 2 forms sketch map for ground communication central station of the present invention;
Fig. 3 is a utmost point low rate satellite moving speech communication of the present invention terminal sketch map;
Fig. 4 is a voice communication working method sketch map of the present invention; Wherein:
Fig. 4 a is a two way voice communication between mobile phone users and the ground station;
Fig. 4 b is mobile phone users and ground station, public network telex network;
Fig. 4 c is a mobile phone users-between ground station-mobile phone users, communicate by letter;
Fig. 5 is voice call management sketch map of the present invention.
Embodiment
The satellite moving speech communication system of a kind of utmost point low rate of the present invention forms and comprises space segment, ground segment and user segment; Be to be the satellite moving speech communication system of basic engineering with extremely low voice compression coding speed technology; Optimal design through system's satellite channel; The optimal design of the optimal design of transmission link, microminiature terminal and ground network control technology confirms that communication system, signal characteristic and the system of satellite communication forms.
The space segment of system of the present invention is for having the transponder on the general GEO communication satellite in the relay type satellite navigation system now, being used for the system carrier modulation signal is transmitted.The GEO communication satellite comprises communication satellite and the small inclination geostationary orbit communication satellite on the geostationary orbit.
The ground segment of system of the present invention is meant the ground communication central station; It is the important component part of native system; Have mobile phone users management in the system, space communication and control channel interface management, comprehensive functions such as user voice data and ground public network voice data exchange.
The user segment of system of the present invention is the mobile voice terminal; Can be divided into types such as portable, vehicular, boat-carrying formula according to user's request; The function services such as voice communication and transfer of data of utmost point low rate can be provided for the user, and portable terminal adopts collapsible small-bore parabolic antenna and easy servo-control system that antenna is carried out bearing servo control.
System of the present invention utilizes in the relay type satellite navigation system existing communication satellite resource to carry out system integration innovation, and these satellite communications and ground network resource are optimized design, has realized the satellite moving speech communication function of utmost point low rate.Accomplished in a satellite navigation system, to realize navigator fix and voice communication dual-use function for this reason, expanded the technical applications and the application model of satellite navigation.
The present invention and existing navigation system realize the major technique difference of communication function:
1) GPS of USA is not used in the transponder resource of communicating by letter with navigation system such as Muscovite GLONASS in the said system, so in the system communication service function can not be provided.The Big Dipper generation navigation system of China, the satellite resource that is used to communicate by letter has only the 8MHz bandwidth, and short message communication, communication function and the limited ability of Location-Based Services can only be provided at present.System of the present invention adopts existing GEO communication satellite resource (C-band) in the relay type satellite navigation system, develops the satellite moving speech communication function of utmost point low rate.
2) user utilizes effectively to navigator fix information that to need means of communication auxiliary; GPS will exchange locating information with the GLONASS navigation system; Need accomplish by means of the satellite communication network (like marisat system, iridium satellite satellite communication system etc.) or the ground communication net in the whole world.System of the present invention can realize function of voice communication in a navigation system, realize navigation and the integrated combination of communicating by letter.
3) said system will provide the whole world or the service of provincialism satellite navigation communicating integral, and system forms that configuration, signal system are collaborative, the coordinated management of star zone network, make business service become very complicated.System of the present invention can make full use of existing satellite resource of relay type satellite navigation system and ground network resource in the zone, the application service of voice communication is provided fast, cheaply.
4) GPS and GLONASS all adopt middle orbit (MEO) satellite, and the relay type satellite navigation system adopts the GEO satellite of high orbit, so system of the present invention is to the higher requirement that is designed with of portable terminal low-power consumption of satellite voice and miniaturization.
The rate selection of voice compression coding of the present invention is to confirm according to the optimal design parameter of system link.The EIRP of satellite (equivalent isotropically radiated power) is lower, adjusts through link, and the speech encoding rate commonly used of adopting international standards is the requirement that can't satisfy the system link surplus.What system of the present invention used is utmost point low rate voice compressed encoding and decoding technology; It is based on the energy parameter quantization algorithm that predictive vector quantizes and the bit resource dynamic is distributed; Make energy parameter reach high effective quantization; The compress speech encoding and decoding reach 300～2400bps, can satisfy the designing requirement of the quality and the system link surplus of synthetic speech.
System of the present invention is to be the star network control model of control centre with the ground communication central station, and the portable terminal of far-end is communicated network management and control.The channel allocation mode adopts allocation method based on demand (DAMA), and frequency and spread spectrum code resources are carried out dynamic assignment.Because portable terminal will take out inbound simultaneously in the voice communication, so volume of transmitted data is symmetrical, and the communication system of departures (ground station-mobile radio station) adopts FDM/CDMA/S-ALOHA control mode, inbound employing CDMA/S-ALOHA control mode.Multi-address connecting mode is code division multiple access (CDMA) mode.
System voice communication channel separate service channel of the present invention (voice) and control channel (signaling), public signaling channel is convenient to each user terminal and is carried out the channel occupancy application.Can also stipulate that for satisfying the emergency call needs special control channel is as the urgent call channel.
1) networking mode
System of the present invention mainly contains satellite moving speech communication terminal three parts of GEO communication satellite, ground communication central station and far-end and forms, and system adopts star-shaped network structure, and its sketch map is as shown in Figure 1.
Space segment:
Space segment of the present invention adopts the GEO communication satellite of relay type satellite navigation system; Because available GEO communication satellite is a lot of in rail quantity; Satellite resource is very abundant, and it is feasible therefore developing voice communication system, and the investment of system and operation cost of use are lower.We are used for system design to the transponder resource of Asian Pacific 1 satellite communication satellite (142 ° of E); This satellite has become the Synchronous-Orbiting Communication Satellite of small inclination at present; Its EIRP is lower; 36dBw is only arranged in coverage, and that realize the terminal miniaturization of satellite moving speech communication, low-power consumption requires difficulty bigger.For this reason, in system design, made full use of the resourceful characteristics of communication satellite communications transponder, adopted the way that exchanges power resource with frequency resource for, so the system communication system adopts spread spectrum communication mode.
Ground segment:
The ground communication central station adopts heavy caliber parabolic antenna (bore is 9～16 meters) to solve the low problem of the weak EIRP with communication satellite of Incoming signal, to satisfy the requirement of satellite link.Communication report center is responsible for distributing to portable terminal to all satellite channel resource as network coordinating station (NCS) and uses, and carries out the Various types of data exchange through PSE and ground common communication network users.Mobile subscriber and public network user interconnects in the realization system net.
Ground communication central station composition frame chart of the present invention is as shown in Figure 2.Ground station is made up of satellite communication equipment, ground installation control and management and ground network control subsystem.
The earth station equipment subsystem comprise antenna feeder and servo, transmit and receive, clock synchronization and power subsystem etc., mainly accomplish the baseband modulation and demodulation of satellite-signal and the radio frequency frequency conversion is amplified and emission receives.
Earth station equipment control and management subsystem is mainly accomplished earth station equipment monitoring operation maintenance, equipment disposition and ground station's safety management.
Ground network control and management subsystem is mainly accomplished network configuration, user management, system's control, charging financial management, authentication management and voice data exchange management etc.
User segment:
Voice communication terminal of the present invention comprises antenna, transmitting-receiving radio frequency component, transmitting-receiving base band, vocoder and Terminal Control Element composition.The terminal is formed as shown in Figure 3.
Simultaneous Voice and Data Terminals is divided into portable, vehicle-mounted and boat-carrying portable terminal; Demanding terminal miniaturization, low-power consumption, transmitting power little (1～10W), for vehicle-mounted and Shipborne terminal; Adopt easy servo tracking system that satellite is followed the tracks of, antenna can adopt parabolic antenna or panel antenna array.Having used bore during test is 0.45 meter parabolic antenna, and antenna gain is 25/22dB (emission/reception).
2) communication work mode
Voice communication of the present invention is a full duplex voice communication mode, has more purposes in order to make system, strengthens the compatibility of application flexibility and ground public network, can adopt three kinds of communication work modes.
1) two way voice communication between mobile phone users and the ground station;
2) mobile phone users-between ground station-mobile phone users, communicate by letter in system of the present invention, carries out voice communication between the mobile communication terminal user, transmit through the satellite double bounce through ground station and accomplish, and the communication work mode is as shown in Figure 4;
3) mobile phone users and ground public network telex network.Can be through the switching equipment of ground station, interconnect with the ground public communication network and to communicate by letter.
4) voice call process management
Channel allocation mode of the present invention adopts distribution according to need, and the demand assigned calling procedure has following three root phases:
4) call setup: the calling party through control channel earthward communication report center send call request information; Central station is being confirmed under the idle condition of satellite channel and called party instrument; Distribute satellite channel to calling party and callee; Calling party and callee carry out continuity test, set up circuit through central station.
5) conversation: after circuit was set up, communicating pair can be conversed or transfer of data.
6) take out stitches: behind the end of conversation, by calling party or the callee of conversation earthward communication report center send end of conversation information, ground station beams back and confirms and reclaim channel (comprising satellite channel and subscriber channel).The voice call process management is as shown in Figure 5.
Key technology of the present invention and feasibility
1) utmost point low rate voice communication system design
The design key at the mobile voice terminal of system of the present invention is to solve the low-power consumption problem; Designing requirement power is little by (1～10W); Power consumption 5～10W under the lower condition of GEO satellite EIRP, just need utilize frequency bandwidth to exchange power for; Therefore can adopt the modulation system of spread spectrum, obtain enough spreading gains.For voice communication; Be user oriented real-time needs and allocated channel; Each user is request channel at random, and therefore, system adopts the multi-access mode of FDM/CDMA/S-ALOHA; The broadcast channel that promptly sets off adopts the FDM/CDMA/S-ALOHA mode, and the CDMA/S-ALOHA system is adopted in inbound passback.For two-way real-time speech communicating; In order to realize signalings such as user speech link assignment, call request, foundation; Need have Traffic Channel (voice channel), signaling channel (control channel) mode of operation, so modulation system adopts QPSK or BPSK; The I branch road transmits signaling data, and the Q branch road transmits speech data.Voice communication can " one jumps " be communicated with; Voice portable terminal and user's communication through the ground public network of ground station exchange; Also can " two jump " accomplish, the communication of transmitting through central station between the voice portable terminal, this is very valuable in the emergency communication process.
Feasibility: communication system of the present invention is on the basis of the communication system of existing satellite moving speech communication net, has carried out optimal design, efficiently utilize the frequency resource of communication channel to carry out dynamic assignment, is main demand to satisfy emergency communication.The complexity of the simplified system of trying one's best during design strengthens the flexibility of the present invention's use and the diversity of application, and therefore, the present invention is feasible on communication system.
2) voice communication of utmost point low rate and channel error correction coding key technology
Adopt extremely low encoded speech data technology-quantize the energy parameter quantization algorithm that distributes with the bit resource dynamic, make the energy parameter high effective quantization, make voice compression coding can hang down 300bps, satisfy the quality requirement of synthetic speech based on predictive vector.Because the mobility of small inclination inclination geosynchronous satellite, the signal attenuation in the transmission course of space and the channel degradation that causes such as bursty interference at random; And because the restriction of the rate of information throughput; So design effective channel verification and error correction method, adopt satellite voice communication link error-control technique to guarantee reliability of data transmission and quality.Utilize many code channels CDMA multiple carrier multiplex technique, realize further improving information transfer efficiency.
Feasibility: developed at present and developed utmost point low rate (300～2400bps) voice compressed encoding and decoding technology; Voice quality can satisfy call requirement; Corresponding technical standard is formulated, and therefore, voice system source encoding of the present invention and channel coding technology are feasible.
3) design of simple and easy servo tracking system
In the process of mobile satellite communication system design, consider the interference of communication terminal to adjacent star, satisfy International Telecommunication Association's transmit power spectral density restriction.Existing communication in moving system antenna adopts narrow beam and complicated SERVO CONTROL tracking system usually; Make system to adjacent satellite multiplexing in the multiplexing and polarization mode that keeps to carry out under the situation of distance each other frequency; When the transmission of the voice that need higher rate and image, normally the characteristic through improving antenna itself is like the method that increases beam gain and sidelobe performance or increase transmitting power and solve link margin deficiency problem.Increase the gain of power and antenna, certainly will will increase the complexity and the power consumption of terminal equipment, do not satisfy the designing requirement of the miniaturization of voice terminal device.Therefore the present invention adopts high-gain, the portable shaped aerial of high efficiency, and antenna pattern is at pitch orientation wave beam broad, and azimuth direction is narrower, and SERVO CONTROL is adjustable in pitch orientation, and the azimuth direction SERVO CONTROL has been simplified the SERVO CONTROL tracking system of antenna.
Feasibility: the servo tracking technology of satellite portable terminal, be applied to the communication in moving system, the present invention combines the requirement of native system to the Satellite Tracking precision; Adopt the satellite orbit data closed loop to follow the tracks of working method; Simplify the structural complexity of tracking servo, reduced cost, developed easy antenna servo tracking system; Therefore, be feasible technically.
Claims (7)
1. the satellite moving speech communication system of a utmost point low rate comprises space segment, ground segment and user segment; It is characterized in that space segment utilizes the transponder of the GEO communication satellite of relay type satellite navigation system, communication system adopts spread spectrum communication mode;
Ground segment is the ground communication central station, adopts the heavy caliber parabolic antenna to solve the low problem of the weak EIRP with communication satellite of Incoming signal, to satisfy the requirement of satellite link; Communication report center is responsible for distributing to portable terminal to all satellite channel resource as network coordinating station and uses; And carry out Various types of data exchange through PSE and ground common communication network users, realize interconnecting of mobile subscriber and public network user in system's net;
User segment comprises portable, vehicle-mounted or boat-carrying voice communication portable terminal, is miniaturization, low-power consumption; The terminal equipment that transmitting power is little; For vehicle-mounted or Shipborne terminal, adopt easy servo tracking system that satellite is followed the tracks of, antenna adopts parabolic antenna or panel antenna array.
2. the satellite moving speech communication system of utmost point low rate as claimed in claim 1; It is characterized in that; Said ground communication central station; Comprise antenna feeder and servo, transmit and receive, clock synchronization and power subsystem, amplify and the emission reception with baseband modulation and demodulation and the radio frequency frequency conversion of accomplishing satellite-signal, its parabolic antenna bore is 9～16 meters;
The editing equipment management subsystem of ground communication central station is accomplished earth station equipment monitoring operation maintenance, equipment disposition and ground station's safety management;
The ground network control and management subsystem of ground communication central station is accomplished network configuration, user management, system's control, charging financial management, authentication management and voice data exchange management work.
3. the satellite moving speech communication system of utmost point low rate as claimed in claim 1; It is characterized in that the voice communication portable terminal of said user segment comprises antenna, transmitting-receiving radio frequency component, transmitting-receiving base band, vocoder and Terminal Control Element; Its transmitting power is 1～10W, and power consumption is 5～20W; The used parabolic antenna bore of vehicle-mounted or Shipborne terminal is 0.45 meter, and the emission/receiving gain of antenna is 25/22dB.
4. the satellite moving speech communication system of utmost point low rate as claimed in claim 1 is characterized in that, adopts three kinds of communication work modes:
1) two way voice communication between mobile phone users and the ground station;
2) mobile phone users-between ground station-mobile phone users, communicate by letter in system, carries out voice communication between the mobile communication terminal user, transmit through ground station and accomplish through the satellite double bounce;
3) mobile phone users and ground public network telex network, the switching equipment through ground station interconnects with the ground public communication network and to communicate by letter.
5. the satellite moving speech communication system of utmost point low rate as claimed in claim 1 is characterized in that, the channel allocation mode is distribution according to need, and the demand assigned calling procedure is following:
1) call setup: the calling party through control channel earthward communication report center send call request information; Central station is being confirmed under the idle condition of satellite channel and called party instrument; Distribute satellite channel to calling party and callee; Calling party and callee carry out continuity test, set up circuit through central station;
2) conversation: after circuit was set up, communicating pair can be conversed or transfer of data;
3) take out stitches: behind the end of conversation, by calling party or the callee of conversation earthward communication report center send end of conversation information, ground station beams back and confirms and recover satellites channel and subscriber channel.
6. the satellite moving speech communication system of utmost point low rate as claimed in claim 1 is characterized in that, said utmost point low rate is that speech coding adopts voice compression technique, and information rate is 300～2400bps, makes transmission link obtain bigger coding spread spectrum gain.
7. the satellite moving speech communication system of utmost point low rate as claimed in claim 1; It is characterized in that; The departures broadcast channel adopts the FDM/CDMA/S-ALOHA mode, and the CDMA/S-ALOHA system is adopted in inbound passback, and modulation system adopts QPSK or BPSK; The I branch road transmits signaling data, and the Q branch road transmits speech data.
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