CN113726403B - Satellite-borne random measurement and control terminal burst measurement and control quick response method and system - Google Patents

Satellite-borne random measurement and control terminal burst measurement and control quick response method and system Download PDF

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CN113726403B
CN113726403B CN202110826231.8A CN202110826231A CN113726403B CN 113726403 B CN113726403 B CN 113726403B CN 202110826231 A CN202110826231 A CN 202110826231A CN 113726403 B CN113726403 B CN 113726403B
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CN113726403A (en
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杨瑜波
吉欣
吕晶晶
成琦
李静澜
任经纬
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Xian Institute of Space Radio Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
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Abstract

The invention relates to a quick response method for burst measurement and control of a satellite-borne random measurement and control terminal, which is suitable for a spacecraft satellite-borne random measurement and control terminal to quickly respond to a burst measurement and control request initiated by a satellite under a novel random access measurement and control system and estimate an optimal ground access point so as to complete full-time random measurement and control as required. The traditional satellite-borne measurement and control terminal does not have a burst measurement and control function, the ground is usually in a measurement and control arc section, and measurement and control task requests are initiated from the ground according to satellite state remote measurement. The method is based on an optimal node estimation method of signal-to-noise ratio estimation and short-time orbit prediction, the optimal ground access point is comprehensively selected from the signal-to-noise ratio of an uplink broadcast signal, the load state of the ground access point, the short-time orbit prediction, satellite-ground elevation estimation and multi-dimensional aspects, and a measurement and control link is quickly established in cooperation with the ground. The rapid response of the satellite burst measurement and control is realized, the response time is better than 10 seconds, and the requirement of the satellite emergency measurement and control is met.

Description

Satellite-borne random measurement and control terminal burst measurement and control quick response method and system
Technical Field
The invention relates to the technical field of spacecraft random access measurement and control, in particular to a satellite-borne random measurement and control terminal burst measurement and control quick response method.
Background
The existing measurement and control technical field has the following requirements that the emergent emergency measurement and control instructions sent by satellite services are quickly identified when a measurement and control terminal is in the whole process of network access, network access and network disconnection, and the service switching operation of a satellite-borne terminal is executed after the terminal state and the measurement and control service state are quickly researched and judged according to a cross-layer query strategy.
The random measurement and control body has the following characteristics:
1. the air interface protocol is a novel satellite random access measurement and control system.
2. A space-ground integrated random access system comprises 3 ground panoramic beam random access measurement and control stations and a space-chain relay satellite SMA panoramic beam random access system.
3. The full-time and automatic measurement and control of the medium and low orbit aircrafts and the giant constellations are supported, and the workload of ground pipe transportation personnel is obviously reduced.
4. The system is compatible with conventional foundation, vehicle-mounted and ship-mounted measurement and control resources, the panoramic beam random access system solves the problems of measurement and control coverage and timeliness, and the conventional multi-platform measurement and control resources solve the problems of special user support and measurement and control hotspots.
The random measurement and control terminal has the following characteristics;
1. physical layer: the quick synchronous demodulation of the broadcasting signals of the same code and different frequency points between stations is supported; the method supports the rapid synchronous demodulation of the broadcast signals with the same frequency, the same code and different phases among the layered beams in the station; the two modes effectively improve the expandability of the multiple access in the random access protocol; aiming at the problem that the processing resources of the satellite-borne terminal are limited, a novel efficient polarization code coding scheme is developed.
2. Data link layer: the problem of intra-station mobility management of a measurement and control object is solved, measurement and control services are not interrupted when inter-station beam switching and inter-station signal switching are carried out, and users are not sensitive to switching.
3. Network layer: combines conventional multi-platform measurement and control resources, solves the problem of idle-state mobility management of the measurement and control object,
the emergency measurement and control of the satellite end and the ground end is supported, and the response time of the system is superior to 10S.
The burst measurement and control function of the satellite-borne terminal is mainly realized in the random measurement and control terminal, and the prior art cannot meet the requirement that the response time of the system is better than 10S.
Disclosure of Invention
The invention aims to: the method and the system overcome the defects of the prior art, and provide a satellite-borne random access measurement and control terminal burst measurement and control quick response method and system, which are used for finishing the autonomous initiation of burst measurement and control request work of a spacecraft under a novel random access measurement and control system, quickly finishing the estimation of a ground optimal access point at a satellite end, and quickly establishing a measurement and control service link in cooperation with the ground, thereby finishing the conversion operation of random access to measurement and control services.
The above purpose of the invention is realized by the following technical scheme:
a satellite-borne random measurement and control terminal burst measurement and control quick response method comprises the following steps:
firstly, a satellite initiates a burst measurement and control request at any time and any position through a satellite service;
after receiving the burst request, the satellite-borne random measurement and control terminal carries out optimal ground access node estimation, carries out weight quantization and weighting operation from three dimensions of uplink broadcast signal-to-noise ratio estimation, ground access point load state detection, short-time orbit prediction based on service duration and satellite-to-ground elevation estimation respectively, and carries out optimal selection on the ground access node estimation;
and step three, the satellite-borne random measurement and control terminal sends the relevant telemetering results and the spatial position information to the ground optimal access node in a periodic reporting mode according to the optimal selection result of the ground access node, so that the quick response of the satellite-borne random measurement and control terminal to the burst measurement and control is completed.
Further, the second satellite-borne random access measurement and control terminal performs optimal ground access node estimation, specifically:
STEP 1: in the coverage area of the ground panoramic beam system, the satellite-borne random measurement and control terminal demodulates the uplink broadcast signals; extracting the frame information of the uplink broadcast signal, and extracting the load state of the ground access point after passing the identity authentication; estimating the signal-to-noise ratio by using an uplink broadcast signal capturing head, sorting from large to small, and distributing weights to obtain weights C1, C2 and C3;
STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3;
STEP 3: performing short-time orbit prediction and satellite-ground elevation estimation based on service duration: according to the service duration, short-time orbit estimation with the duration of Te is carried out, the satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3;
step 4: calculating total weights W1, W2 and W3 of the ground access points; wherein W1 ═ C1+ S1+ E1, W2 ═ C2+ S2+ E2, W3 ═ C3+ S3+ E3; and selecting the access point with the maximum total weight of the ground access points as the best access point.
Further, the STEP 1: in the coverage area of the ground panoramic beam system, the satellite-borne random measurement and control terminal demodulates the uplink broadcast signals; extracting the frame information of the uplink broadcast signal, and extracting the load state of the ground access point after passing the identity authentication; estimating the signal-to-noise ratio by using an uplink broadcast signal acquisition head, sorting from large to small, and distributing weights to obtain weights C1, C2 and C3, specifically:
STEP 1.1: synchronization of an uplink broadcast signal acquisition head: after the frame synchronization of the uplink broadcast signal, the satellite-borne random measurement and control terminal searches the accurate position of the capture head of the uplink broadcast signal;
STEP 1.2: uplink broadcast signal to noise ratio estimation: carrying out coherent integration on the capture head to obtain a signal branch correlation value I and a noise branch correlation value Q; obtaining the signal-to-noise ratio estimation of the uplink broadcast signal by utilizing the signal branch correlation value I and the noise branch correlation value Q: ID1_ SNR, ID2_ SNR, ID3_ SNR, wherein if the satellite borne ondemand terminal is invisible to a node, the signal-to-noise ratio of the path is zero; if the satellite-borne random measurement and control terminal is not in the coverage area of the ground panoramic beam system, the relay node is directly selected as the optimal access point;
STEP 1.3: uplink broadcast signal to noise ratio prioritization: sorting ID1_ SNR, ID2_ SNR and ID3_ SNR from large to small, selecting the maximum value and the second maximum value, and performing difference operation on the two values to obtain
Figure BDA0003173891940000031
The second maximum value and the minimum value are subtracted to obtain
Figure BDA0003173891940000032
STEP 1.4: and carrying out weight distribution according to the signal-to-noise ratio weight distribution table to obtain weights C1, C2 and C3.
Further, the snr weight assignment table is specifically as follows:
TABLE 1 SNR weight assignment
Figure BDA0003173891940000041
Further, the STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3, wherein the weights comprise the following specific steps:
step 2.1: after the satellite-borne random measurement and control terminal synchronizes the uplink broadcast signals, identity authentication is carried out;
step2.2: the satellite-borne random measurement and control terminal extracts the information of the ground access point in the uplink broadcast signal frame to obtain the load state of the ground access point;
step2.3: the load states of the ground access points are divided into three types: IDLE, BUSY, ERR; the IDLE represents that the service resources of the ground access point are in an IDLE state, and can carry out measurement and control services at any time; the BUSY represents that the service resources of the ground access point are in a BUSY state, and the measurement and control tasks can be selectively added according to the priority of the newly added measurement and control service; ERR represents that the service resources of the ground access point are in an abnormal state and do not have access conditions;
step2.4: for access point traffic load balancing, the weights corresponding to IDLE, BUSY, ERR are set to 1.0, 0.5, 0, and three ground access point traffic load STATEs ID1_ STATE, ID2_ STATE, ID3_ STATE are obtained, and the corresponding weights are S1, S2, S3, respectively.
Further, the STEP 3: performing short-time orbit prediction and satellite-ground elevation estimation based on service duration: according to the service duration, short-time orbit estimation with duration Te is carried out, the satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3, wherein the method specifically comprises the following steps:
step3.1: the satellite-borne random measurement and control terminal receives space positions (Xt, Yt and Zt) and speed information (Vx, Vy and Vz) sent from the outside in real time;
step3.2: carrying out orbit estimation with the time length of Te on the satellite-borne incident measurement and control terminal to obtain space position information (Xt _ pd, Yt _ pd and Zt _ pd) after the orbit estimation;
step3.3: the satellite-borne monitoring and control terminal receives the position information (X0, Y0 and Z0) of the ground access point sent from the outside;
step3.4: calculating satellite elevation angle estimated values ID1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA by using the spatial positions (Xt, Yt and Zt), the spatial position information (Xt _ pd, Yt _ pd and Zt _ pd) after orbit estimation and the ground access point position information (X0, Y0 and Z0);
step3.5: corresponding weights, E1, E2, E3, are assigned according to the satellite-ground elevation estimate.
Further, the weight assignment principle is as follows: when the satellite-ground elevation angle estimated value ID _ EXTRA is less than 5 degrees, the weight is zero; when the satellite-ground elevation angle estimated value is more than or equal to 5 degrees and less than or equal to 45 degrees in ID _ EXTRA, the weight is 0.5; when the satellite-ground elevation angle estimated value is more than or equal to 45 degrees and less than or equal to 90 degrees ID _ EXTRA, the weight is 1.0.
Furthermore, the invention also provides a satellite-borne random measurement and control terminal burst measurement and control quick response system, which comprises:
measurement and control request module: the satellite initiates a burst measurement and control request at any time and any position through the satellite affair;
an optimal ground access node estimation module: after the satellite-borne on-board measurement and control terminal receives the burst request, optimal ground access node estimation is carried out, weight quantization and weighting operation are carried out on three dimensions of uplink broadcast signal-to-noise ratio estimation, ground access point load state detection, short-time orbit prediction based on service duration and satellite-to-ground elevation estimation respectively, and optimal selection is carried out on the ground access node estimation;
a quick response module: and the satellite-borne random measurement and control terminal sends the related telemetering results and the spatial position information to the ground optimal access node in a periodic reporting mode according to the optimal selection result of the ground access node, so that the quick response of the burst measurement and control of the satellite-borne random measurement and control terminal is completed.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention makes the satellite-borne random access measurement and control terminal complete the burst measurement and control function of the satellite in a novel random access measurement and control system for the first time.
(2) The invention provides a brand new satellite-borne on-site measurement and control terminal burst measurement and control quick response method, which simplifies algorithm design under the conditions of not increasing the operation burden of a satellite-borne terminal and reducing the risk of burst measurement and control misjudgment, adopts a multi-dimensional optimal ground access node estimation algorithm, respectively estimates the signal-to-noise ratio of an uplink broadcast signal, detects the load state of a ground access point, optimally selects the ground access point estimation based on short-time orbit prediction and satellite-ground elevation estimation of service duration in three dimensions, and quickly completes measurement and control link establishment in cooperation with the ground.
(3) The satellite-borne random access measurement and control terminal quickly estimates the current optimal ground access node according to the satellite burst measurement and control request in all the stages of network access, network access and network disconnection, thereby quickly establishing the satellite-ground measurement and control link of the satellite-borne random access measurement and control terminal, and the access time is superior to 10S.
(4) The optimal node estimation method based on the signal-to-noise ratio estimation and the short-time orbit prediction selects the optimal ground access point from the signal-to-noise ratio of the uplink broadcast signal, the load state of the ground access point, the short-time orbit prediction, the satellite-ground elevation estimation and the multidimensional synthesis, and can realize the parallel and real-time estimation of the optimal ground node under the condition of increasing the minimum cost of processing resources.
Drawings
FIG. 1 is a block diagram showing the overall block diagram of a satellite-borne random access measurement and control terminal according to the present invention;
FIG. 2 is a general block diagram of a burst measurement and control quick response method of a satellite-borne random measurement and control terminal according to the present invention;
FIG. 3 is a flowchart of the present invention for terrestrial optimal access point estimation;
FIG. 4 is a block diagram of the invention based on temporal short-term orbit prediction.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
The invention provides a satellite-borne on-board measurement and control terminal burst measurement and control quick response method, which is mainly realized in an on-board measurement and control terminal and aims to meet the requirement of 10S of system response time. The method can realize that once a sudden measurement and control request exists in the coverage range of the space-ground based panoramic beam system of the idle-state satellite at the stages of network access, network on and network off, the random measurement and control terminal can quickly complete business switching operation within 10S, and an end-to-end reliable measurement and control link is established. The method is successfully applied to principle prototypes and normal samples, and the effectiveness and the feasibility of the method are fully verified in the whole satellite joint test and the satellite-ground butt joint.
The structure of the satellite-borne random access measurement and control terminal is shown in fig. 1, and the satellite-borne random access measurement and control terminal is composed of a radio frequency broadband receiving channel, a radio frequency broadband transmitting channel, a power supply, an access control unit and a measurement and control service unit. The radio frequency broadband receiving channel receives an uplink broadcast signal and an uplink/forward service signal sent by an antenna microwave network; down-converting the received signal to an intermediate frequency signal, and sending the intermediate frequency signal to an access control unit; the access control unit demodulates the uplink broadcast signal, sends a control instruction according to the demodulation information and starts a measurement and control service unit; after the measurement and control service unit sends service state remote measurement information to the access control unit in real time, the access control unit forms a downlink/reverse access application frame and sends the downlink/reverse access application frame to an antenna through a radio frequency broadband channel; meanwhile, the measurement and control service unit collects the whole satellite telemetering information in real time to form a downlink/return service frame, and the downlink/return service frame is sent to an antenna through a radio frequency broadband channel.
As shown in fig. 2, the invention provides a method for quickly responding to burst measurement and control of a satellite-borne random measurement and control terminal, which is mainly implemented in an access control unit and comprises the following specific steps:
firstly, a satellite initiates a burst measurement and control request at any time and any position through a satellite service;
after receiving the burst request, the satellite-borne random measurement and control terminal carries out optimal ground access node estimation, carries out weight quantization and weighting operation from three dimensions of uplink broadcast signal-to-noise ratio estimation, ground access point load state detection, short-time orbit prediction based on service duration and satellite-to-ground elevation estimation respectively, and carries out optimal selection on the ground access node estimation;
the method specifically comprises the following steps:
STEP 1: in the coverage area of the ground panoramic beam system, the satellite-borne random measurement and control terminal demodulates the uplink broadcast signals; extracting the frame information of the uplink broadcast signal, and extracting the load state of the ground access point after passing the identity authentication; estimating the signal-to-noise ratio by using an uplink broadcast signal capturing head, sorting from large to small, and distributing weights to obtain weights C1, C2 and C3;
as shown in fig. 3, based on a priority ranking algorithm for signal-to-noise ratio estimation of broadcast signals, the satellite-borne opportunistic measurement and control terminal performs signal-to-noise ratio estimation and ranking on the received uplink broadcast signals, and assigns weights to characterize channel quality.
(1.1): synchronization of an uplink broadcast signal acquisition head: after the frame synchronization of the uplink broadcast signal, the satellite-borne random measurement and control terminal searches the accurate position of an uplink broadcast signal capturing head, wherein the length of the capturing head is 310 ms;
(1.2): uplink broadcast signal to noise ratio estimation: carrying out coherent integration on the capture head, wherein the integration length is 300ms, and obtaining a signal branch correlation value I and a noise branch correlation value Q; obtaining the signal-to-noise ratio estimation of the uplink broadcast signal by utilizing the signal branch correlation value I and the noise branch correlation value Q: ID1_ SNR, ID2_ SNR, ID3_ SNR, wherein if the satellite borne ondemand terminal is invisible to a node, the signal-to-noise ratio of the path is zero; if the satellite-borne random measurement and control terminal is not in the coverage area of the ground panoramic beam system, the relay node is directly selected as the optimal access point;
(1.3): uplink broadcast signal to noise ratio prioritization: sorting ID1_ SNR, ID2_ SNR and ID3_ SNR from large to small, selecting the maximum value and the second maximum value, and performing difference operation on the two values to obtain
Figure BDA0003173891940000081
The second maximum value and the minimum value are subtracted to obtain
Figure BDA0003173891940000082
(1.4): and carrying out weight distribution according to the signal-to-noise ratio weight distribution table to obtain weights C1, C2 and C3.
TABLE 1 SNR weight assignment
Figure BDA0003173891940000083
STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3;
the method specifically comprises the following steps:
(2.1): after the satellite-borne random measurement and control terminal synchronizes the uplink broadcast signals, identity authentication is carried out;
(2.2): the satellite-borne random measurement and control terminal extracts the information of the ground access point in the uplink broadcast signal frame to obtain the load state of the ground access point;
(2.3): the load states of the ground access points are divided into three types: IDLE, BUSY, ERR; the IDLE represents that the service resources of the ground access point are in an IDLE state, and can carry out measurement and control services at any time; the BUSY represents that the service resources of the ground access point are in a BUSY state, and the measurement and control tasks can be selectively added according to the priority of the newly added measurement and control service; ERR represents that the service resources of the ground access point are in an abnormal state and do not have access conditions;
(2.4): for access point traffic load balancing, the weights corresponding to IDLE, BUSY, ERR are set to 1.0, 0.5, 0, and three ground access point traffic load STATEs ID1_ STATE, ID2_ STATE, ID3_ STATE are obtained, and the corresponding weights are S1, S2, S3, respectively.
STEP 3: as shown in fig. 4, short-time orbit prediction and satellite-ground elevation estimation based on service duration are performed: according to the service duration, short-time orbit estimation with duration Te is carried out, satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3;
the method specifically comprises the following steps:
(3.1): the satellite-borne random measurement and control terminal receives space positions (Xt, Yt and Zt) and speed information (Vx, Vy and Vz) sent from the outside in real time;
(3.2): carrying out orbit estimation with the time length of Te (which can be set, 30S-300S) on the satellite borne random measurement and control terminal to obtain space position information (Xt _ pd, Yt _ pd and Zt _ pd) after the orbit estimation;
(3.3): the satellite-borne monitoring and control terminal receives the position information (X0, Y0 and Z0) of the ground access point sent from the outside;
(3.4): calculating satellite elevation angle estimated values ID1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA by using the spatial positions (Xt, Yt and Zt), the spatial position information (Xt _ pd, Yt _ pd and Zt _ pd) after orbit estimation and the ground access point position information (X0, Y0 and Z0);
(3.5): corresponding weights, E1, E2, E3, are assigned according to the satellite-ground elevation estimate.
The weight assignment principle is as follows: when the satellite-ground elevation angle estimated value ID _ EXTRA is less than 5 degrees, the weight is zero; when the satellite-ground elevation angle estimated value is more than or equal to 5 degrees and less than or equal to 45 degrees in ID _ EXTRA, the weight is 0.5; when the satellite-ground elevation angle estimated value is more than or equal to 45 degrees and less than or equal to 90 degrees ID _ EXTRA, the weight is 1.0.
Step 4: calculating total weights W1, W2 and W3 of the ground access points; wherein W1 ═ C1+ S1+ E1, W2 ═ C2+ S2+ E2, W3 ═ C3+ S3+ E3; and selecting the access point with the maximum total weight of the ground access points as the best access point.
And step three, the satellite-borne random measurement and control terminal sends the relevant telemetering results and the spatial position information to the ground optimal access node in a periodic reporting mode according to the optimal selection result of the ground access node, so that the quick response of the satellite-borne random measurement and control terminal to the burst measurement and control is completed.
Through the above processing, the estimation of the best access point is completed. The estimation process can be carried out in parallel, the flow is simple and efficient, and the design complexity of the satellite-borne measurement and control terminal is not increased. On the basis of ground access point load balancing, the system has good channel quality and a proper measurement and control arc section, and can effectively bear burst measurement and control services.
And the satellite-borne random measurement and control terminal sends the related telemetering result and the space position information to the ground optimal access point in a periodic report mode according to the estimation result of the ground optimal access point, assists the ground service beam in precise tracking, and cooperates with the ground to quickly complete the measurement and control link establishment.
The invention does not adopt an independent zero value calibration signal, but adopts a downlink measurement signal as the zero value calibration signal of the responder, thereby simplifying the design of a single machine; self-correcting signal self-adaptive control based on uplink channel signal power estimation is adopted, so that the self-correcting signal is always lower than an uplink receiving signal by 3dB in a full-power dynamic range, and normal receiving of the uplink channel signal is not influenced; and the signals except the self-correcting signal are counteracted by using a multiple access interference counteracting method, so that the zero value measurement precision is improved. The method is successfully applied to a principle prototype, the responder can realize uninterrupted and continuous distance zero value on-line measurement in the full-power dynamic change range of an uplink channel, the measurement precision is better than 1 cm, the requirement that the measurement error of the responder is better than 3 cm is met, and the effectiveness and the feasibility of the method are fully verified.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.

Claims (9)

1. A satellite-borne random measurement and control terminal burst measurement and control quick response method is characterized by comprising the following steps:
firstly, a satellite initiates a burst measurement and control request at any time and any position through a satellite service;
after receiving the burst request, the satellite-borne random measurement and control terminal carries out optimal ground access node estimation, carries out weight quantization and weighting operation from three dimensions of uplink broadcast signal-to-noise ratio estimation, ground access point load state detection, short-time orbit prediction based on service duration and satellite-to-ground elevation estimation respectively, and carries out optimal selection on the ground access node estimation;
the method specifically comprises the following steps:
STEP 1: in the coverage area of the ground panoramic beam system, the satellite-borne random measurement and control terminal demodulates the uplink broadcast signals; extracting the frame information of the uplink broadcast signal, and extracting the load state of the ground access point after passing the identity authentication; estimating the signal-to-noise ratio by using an uplink broadcast signal capturing head, sorting from large to small, and distributing weights to obtain weights C1, C2 and C3;
STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3;
STEP 3: performing short-time orbit prediction and satellite-ground elevation estimation based on service duration: according to the service duration, short-time orbit estimation with duration Te is carried out, satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3;
step 4: calculating total weights W1, W2 and W3 of the ground access points; wherein W1 ═ C1+ S1+ E1, W2 ═ C2+ S2+ E2, W3 ═ C3+ S3+ E3; selecting the access point with the maximum total weight of the ground access points as an optimal access point;
and step three, the satellite-borne incident measurement and control terminal sends the relevant telemetering results and the space position information to the ground optimal access node in a periodic reporting mode according to the optimal selection result of the ground access node, so that the quick response of the satellite-borne incident measurement and control terminal to burst measurement and control is completed.
2. The burst measurement and control quick response method of the satellite-borne random measurement and control terminal according to claim 1, characterized in that: the STEP 1: in the coverage area of the ground panoramic beam system, the satellite-borne random measurement and control terminal demodulates the uplink broadcast signals; extracting the frame information of the uplink broadcast signal, and extracting the load state of the ground access point after passing the identity authentication; estimating the signal-to-noise ratio by using an uplink broadcast signal acquisition head, sorting from large to small, and distributing weights to obtain weights C1, C2 and C3, specifically:
STEP 1.1: synchronization of an uplink broadcast signal acquisition head: after the frame synchronization of the uplink broadcast signal, the satellite-borne random measurement and control terminal searches the accurate position of the capture head of the uplink broadcast signal;
STEP 1.2: and (3) estimating the signal-to-noise ratio of the uplink broadcast signal: carrying out coherent integration on the capture head to obtain a signal branch correlation value I and a noise branch correlation value Q; obtaining the signal-to-noise ratio estimation of the uplink broadcast signal by utilizing the signal branch correlation value I and the noise branch correlation value Q: ID1_ SNR, ID2_ SNR, ID3_ SNR, wherein if the satellite borne ondemand terminal is invisible to a node, the signal-to-noise ratio of the path is zero; if the satellite-borne random measurement and control terminal is not in the coverage area of the ground panoramic beam system, the relay node is directly selected as the optimal access point;
STEP 1.3: uplink broadcast signal to noise ratio prioritization: sorting ID1_ SNR, ID2_ SNR and ID3_ SNR from large to small, selecting the maximum value and the second maximum value, and performing difference operation on the maximum value and the second maximum value to obtain SNR ▽1 (ii) a The second largest value and the smallest value are subtracted to obtain the SNR ▽2 ；
STEP 1.4: and carrying out weight distribution according to the signal-to-noise ratio weight distribution table to obtain weights C1, C2 and C3.
3. The burst measurement and control quick response method of the satellite-borne random measurement and control terminal according to claim 2, characterized in that: the snr weight assignment table is specified as follows:
TABLE 1 SNR weight assignment
Figure FDA0003703889860000021
4. The burst measurement and control quick response method of the satellite-borne random measurement and control terminal according to claim 1, characterized in that: the STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3, wherein the weights comprise the following specific steps:
step2.1: after the satellite-borne random measurement and control terminal synchronizes the uplink broadcast signals, identity authentication is carried out;
step2.2: the satellite-borne random measurement and control terminal extracts the information of the ground access point in the uplink broadcast signal frame to obtain the load state of the ground access point;
step2.3: the load states of the ground access points are divided into three types: IDLE, BUSY, ERR; the IDLE represents that the service resources of the ground access point are in an IDLE state, and can carry out measurement and control services at any time; the BUSY represents that the service resources of the ground access point are in a BUSY state, and the measurement and control tasks can be selectively added according to the priority of the newly added measurement and control service; ERR represents that the service resources of the ground access point are in an abnormal state and do not have access conditions;
step2.4: for access point traffic load balancing, the weights corresponding to IDLE, BUSY, ERR are set to 1.0, 0.5, 0, and three ground access point traffic load STATEs ID1_ STATE, ID2_ STATE, ID3_ STATE are obtained, and the corresponding weights are S1, S2, S3, respectively.
5. The burst measurement and control quick response method of the satellite-borne random measurement and control terminal according to claim 1, characterized in that: the STEP 3: performing short-time orbit prediction and satellite-ground elevation estimation based on service duration: according to the service duration, short-time orbit estimation with duration Te is carried out, the satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3, wherein the method specifically comprises the following steps:
step3.1: the satellite-borne random measurement and control terminal receives space positions (Xt, Yt and Zt) and speed information (Vx, Vy and Vz) sent from the outside in real time;
step3.2: carrying out orbit estimation with the time length of Te on the satellite-borne random measurement and control terminal to obtain space position information (Xt _ pd, Yt _ pd and Zt _ pd) after the orbit estimation;
step3.3: the satellite-borne monitoring and control terminal receives the position information (X0, Y0 and Z0) of the ground access point sent from the outside;
step3.4: calculating satellite elevation angle estimated values ID1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA by using the spatial positions (Xt, Yt and Zt), the spatial position information (Xt _ pd, Yt _ pd and Zt _ pd) after orbit estimation and the ground access point position information (X0, Y0 and Z0);
step3.5: corresponding weights, E1, E2, E3, are assigned according to the satellite-ground elevation estimate.
6. The burst measurement and control quick response method of the satellite-borne random measurement and control terminal according to claim 5, characterized in that: the weight assignment principle is as follows: when the satellite-ground elevation angle estimated value ID _ EXTRA is less than 5 degrees, the weight is zero; when the satellite-ground elevation angle estimated value is more than or equal to 5 degrees and less than or equal to 45 degrees in ID _ EXTRA, the weight is 0.5; when the satellite-ground elevation angle estimated value is more than or equal to 45 degrees and less than or equal to 90 degrees ID _ EXTRA, the weight is 1.0.
7. The system for realizing the burst measurement and control quick response of the satellite-borne on-site measurement and control terminal according to the method for realizing the burst measurement and control quick response of the satellite-borne on-site measurement and control terminal of claim 1 is characterized by comprising the following steps:
measurement and control request module: the satellite initiates a burst measurement and control request at any time and any position through the satellite affair;
an optimal ground access node estimation module: after the satellite-borne on-board measurement and control terminal receives the burst request, optimal ground access node estimation is carried out, weight quantization and weighting operation are carried out on three dimensions of uplink broadcast signal-to-noise ratio estimation, ground access point load state detection, short-time orbit prediction based on service duration and satellite-to-ground elevation estimation respectively, and optimal selection is carried out on the ground access node estimation;
the satellite-borne random measurement and control terminal carries out optimal ground access node estimation and specifically comprises the following steps:
STEP 1: in the coverage area of the ground panoramic beam system, the satellite-borne random measurement and control terminal demodulates the uplink broadcast signals; extracting the frame information of the uplink broadcast signal, and extracting the load state of the ground access point after passing the identity authentication; estimating the signal-to-noise ratio by using an uplink broadcast signal capturing head, sorting from large to small, and distributing weights to obtain weights C1, C2 and C3;
STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3;
STEP 3: performing short-time orbit prediction and satellite-ground elevation estimation based on service duration: according to the service duration, short-time orbit estimation with duration Te is carried out, satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3;
step 4: calculating total weights W1, W2 and W3 of the ground access points; wherein W1 ═ C1+ S1+ E1, W2 ═ C2+ S2+ E2, W3 ═ C3+ S3+ E3; selecting the access point with the maximum total weight of the ground access points as an optimal access point;
a quick response module: and the satellite-borne random measurement and control terminal sends the related telemetering results and the spatial position information to the ground optimal access node in a periodic reporting mode according to the optimal selection result of the ground access node, so that the quick response of the burst measurement and control of the satellite-borne random measurement and control terminal is completed.
8. The on-board satellite-borne on-the-fly measurement and control terminal burst measurement and control quick response system according to claim 7, characterized in that: obtaining weights C1, C2, and C3, specifically:
STEP 1.1: synchronization of an uplink broadcast signal acquisition head: after the frame synchronization of the uplink broadcast signal, the satellite-borne random measurement and control terminal searches the accurate position of the capture head of the uplink broadcast signal;
STEP 1.2: and (3) estimating the signal-to-noise ratio of the uplink broadcast signal: carrying out coherent integration on the capture head to obtain a signal branch correlation value I and a noise branch correlation value Q; obtaining the signal-to-noise ratio estimation of the uplink broadcast signal by utilizing the signal branch correlation value I and the noise branch correlation value Q: ID1_ SNR, ID2_ SNR, ID3_ SNR, wherein if the satellite borne ondemand terminal is invisible to a node, the signal-to-noise ratio of the path is zero; if the satellite-borne random measurement and control terminal is not in the coverage area of the ground panoramic beam system, the relay node is directly selected as the optimal access point;
STEP 1.3: uplink broadcast signal to noise ratio prioritization: sorting ID1_ SNR, ID2_ SNR and ID3_ SNR from large to small, selecting the maximum value and the second maximum value, and performing difference operation on the maximum value and the second maximum value to obtain SNR ▽1 (ii) a The second largest value and the smallest value are subtracted to obtain the SNR ▽2 ；
STEP 1.4: carrying out weight distribution according to a signal-to-noise ratio weight distribution table to obtain weights C1, C2 and C3, wherein the signal-to-noise ratio weight distribution table is specifically as follows:
TABLE 1 SNR weight assignment
Figure FDA0003703889860000051
9. The on-board satellite-borne on-board measurement and control terminal burst measurement and control quick response system according to claim 8, characterized in that: the STEP 2: distributing weights according to a load balancing strategy by using the load state information of the ground access point to obtain weights S1, S2 and S3, wherein the weights comprise the following specific steps:
step2.1: after the satellite-borne random measurement and control terminal synchronizes the uplink broadcast signals, identity authentication is carried out;
step2.2: the satellite-borne random measurement and control terminal extracts the information of the ground access point in the uplink broadcast signal frame to obtain the load state of the ground access point;
step2.3: the load states of the ground access points are divided into three types: IDLE, BUSY, ERR; the IDLE represents that the service resources of the ground access point are in an IDLE state, and can carry out measurement and control services at any time; the BUSY represents that the service resources of the ground access point are in a BUSY state, and the measurement and control tasks can be selectively added according to the priority of the newly added measurement and control service; ERR represents that the service resources of the ground access point are in an abnormal state and do not have access conditions;
step2.4: for the purpose of access point service load balancing, weights corresponding to IDLE, BUSY and ERR are set to be 1.0, 0.5 and 0, so as to obtain three ground access point service load STATEs ID1_ STATE, ID2_ STATE and ID3_ STATE, wherein the corresponding weights are S1, S2 and S3 respectively;
the STEP 3: performing short-time orbit prediction and satellite-ground elevation estimation based on service duration: according to the service duration, short-time orbit estimation with duration Te is carried out, the satellite-ground elevation angle estimation IDs 1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA are obtained by combining ground access point coordinates, and weights are distributed according to a load balancing strategy to obtain weights E1, E2 and E3, wherein the method specifically comprises the following steps:
step3.1: the satellite-borne random measurement and control terminal receives space positions (Xt, Yt and Zt) and speed information (Vx, Vy and Vz) sent from the outside in real time;
step3.2: carrying out orbit estimation with the time length of Te on the satellite-borne random measurement and control terminal to obtain space position information (Xt _ pd, Yt _ pd and Zt _ pd) after the orbit estimation;
step3.3: the satellite-borne monitoring and control terminal receives the position information (X0, Y0 and Z0) of the ground access point sent from the outside;
step3.4: calculating satellite elevation angle estimated values ID1_ EXTRA, ID2_ EXTRA and ID3_ EXTRA by using the spatial positions (Xt, Yt and Zt), the spatial position information (Xt _ pd, Yt _ pd and Zt _ pd) after orbit estimation and the ground access point position information (X0, Y0 and Z0);
step3.5: assigning corresponding weights according to the satellite-ground elevation estimate, E1, E2, E3;
the weight assignment principle is as follows: when the satellite-ground elevation angle estimated value ID _ EXTRA is less than 5 degrees, the weight is zero; when the satellite-ground elevation angle estimated value is more than or equal to 5 degrees and less than or equal to 45 degrees in ID _ EXTRA, the weight is 0.5; when the satellite-ground elevation angle estimated value is more than or equal to 45 degrees and less than or equal to 90 degrees ID _ EXTRA, the weight is 1.0.
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