CN110069430B - Data acquisition system of chrysanthemum chain structure and self-adaptive transmission method - Google Patents
Data acquisition system of chrysanthemum chain structure and self-adaptive transmission method Download PDFInfo
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- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/16—Handling requests for interconnection or transfer for access to memory bus
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- G06F13/16—Handling requests for interconnection or transfer for access to memory bus
- G06F13/1668—Details of memory controller
- G06F13/1678—Details of memory controller using bus width
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- G—PHYSICS
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- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
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Abstract
The invention discloses a data acquisition system of a daisy chain structure, which comprises an analog quantity signal collector, a flight control parameter signal collector, an avionic bus collector and a GPS collector which are connected according to a daisy chain, wherein the flight control parameter signal collector is connected with an onboard flight control output interface, the avionic bus collector is connected with an onboard aviation electrical interface, and the GPS collector is connected with an onboard GPS antenna. The invention can meet the requirements of acquisition and recording of sensor parameters, avionic parameters, GPS parameters and flight control parameters in flight tests. The invention also discloses a self-adaptive transmission method of the daisy chain structure, the invention adopts the daisy chain structure, no main control unit is arranged in the structure, and each test unit self-adaptively negotiates the bandwidth to transmit data according to the transmission requirement; the invention can self-adaptively distribute the bandwidth for the transmission of the synchronous parameters and the asynchronous parameters, thereby improving the reliability and the utilization rate of the bandwidth of the system and improving the flexibility of the system.
Description
Technical Field
The invention belongs to the technical field of data transmission, and particularly relates to a data acquisition system with a chrysanthemum chain structure and a self-adaptive transmission method.
Background
In the test flight of the airplane, test flight test parameters of the test airplane need to be collected in real time, the collected parameters are collected by a collector and then divided into two paths, and one path is subjected to real-time monitoring by a test ground station through a telemetering link so as to ensure the safety of the test flight; a recorder on the other router records for post-incident analysis.
According to the classification of the acquired signal synchronization mode, the test flight test parameters can be divided into two types, namely synchronous parameters and asynchronous parameters. The synchronous parameters are periodic regular signals (such as analog quantity signals output by a sensor), the acquisition system acquires according to the sampling rate specified by the sampling period, and the data output bandwidth is stable; asynchronous parameters (such as avionic parameters and flight control parameters) are asynchronous aperiodic event signals, and the output bandwidth requirement is not fixed in the sampling period.
In the existing scheme, a main control unit is needed by the test system to control parameter sampling and parameter transmission, so that the main control unit is important in position, and if the main control unit fails, the whole test system fails. To meet the potential demand, the system must consider the most extreme case-all asynchronous parameter outputs reach a peak at the same time, from which bandwidth must be allocated at configuration time, causing potential waste of bandwidth.
Disclosure of Invention
The invention aims to provide a data acquisition system of a chrysanthemum chain structure, which can meet the requirements of acquisition and recording of sensor parameters, avionic parameters, GPS parameters and flight control parameters in flight tests.
The invention also aims to provide a self-adaptive transmission method of a daisy chain structure, which adopts a daisy chain structure, wherein the structure is not provided with a master control unit, and each test unit self-adaptively negotiates bandwidth to transmit data according to transmission requirements; the invention can self-adaptively distribute the bandwidth for the transmission of the synchronous parameters and the asynchronous parameters, thereby improving the reliability and the utilization rate of the bandwidth of the system and improving the flexibility of the system.
The invention is mainly realized by the following technical scheme: a data acquisition system of a daisy chain structure comprises an analog quantity signal collector, a flight control parameter signal collector, an avionic electronic bus collector and a GPS collector which are connected according to a daisy chain, wherein the analog quantity signal collector is used for collecting an output signal of an onboard sensor, the flight control parameter signal collector is connected with an onboard flight control output interface, the avionic electronic bus collector is connected with an onboard aviation electrical interface, and the GPS collector is connected with an onboard GPS antenna.
In order to better implement the present invention, the network communication module of the data acquisition system further includes a network PHY driver, a network MAC logic, a network application layer logic, a network data receiving buffer management, a network data sending buffer management, an IEEE1588 master role logic, and an IEEE1588 slave role logic.
In order to better realize the invention, the system further comprises a data acquisition module, wherein the data acquisition module comprises a system frame and a multifunctional frame, and the system frame is used for completing equipment networking, output transmission control, data recording and a user interface; the system frame comprises a synchronous parameter/asynchronous parameter acquisition module; the multifunctional frame is 8-channel analog quantity acquisition and excitation output.
In order to better implement the present invention, the system frame further includes a system frame control module, a setup management module, a file management module, a system frame communication module, a real-time transmission module, an internet access communication module, a real-time transmission module, a recording module, a sensor excitation module, and a synchronous parameter/asynchronous parameter acquisition module; the multifunctional frame comprises a subframe communication module, a subframe control module, a setup management module, a real-time transmission module, a sensor excitation module and a synchronous parameter/asynchronous parameter acquisition module; the system frame control module is used for controlling the setup management module to complete the distribution of a user preset instruction and controlling the file management module to complete the initialization of a file system to wait for entering a real-time recording state; and if the system frame communication module finishes time service, data acquisition is started, the real-time transmission module starts real-time data transmission, the real-time data is recorded and sent out by the internet access communication module, and meanwhile, the real-time data sent by other nodes is received and enters the file recording module for recording through the real-time transmission module.
In order to better implement the present invention, further, the setup management module is configured to store contents of a register, a real-time data transmission instruction, a real-time data transmission format, and a time sequence, which are predetermined by a user; the real-time transmission module is used for transmitting the AD data, the AD data collected by the function frame, the data received by the network port communication module to a sending buffer area of the network port communication module at a specified time according to a packet format and a data storage buffer area of the file recording module in a real-time state.
The invention is mainly realized by the following technical scheme: a self-adaptive transmission method of a daisy chain structure is characterized in that a UDP-based data packet is generated based on two or more synchronous parameter collectors and asynchronous parameter collectors in the daisy chain structure; the method mainly comprises the following steps:
step S00: setting parameter sampling frequency of nodes on the daisy chain, and designating one or more nodes on the chain as recording nodes;
step S01: aiming at the periodic parameters, occupying a fixed bandwidth according to a sampling rate, and periodically recording data sent by the nodes;
step S02: aiming at asynchronous parameters, all asynchronous parameter acquisition nodes compile UDP packets and send data transmission bandwidth demand information to other nodes;
step S03: after receiving the requirements sent by other nodes, all nodes on the daisy chain sequence the transmission bandwidth requirements of all nodes including the nodes;
step S04: in the next sampling period, the first four nodes with the most transmission bandwidth requirements are transmitted through occupied bandwidth; wherein, the node in the first sequence will occupy 1/2 of the total bandwidth of the system for transmission; the node in the second order will transmit 1/4 occupying the total bandwidth of the system; sequencing the 1/4 nodes of the third node and the fourth node to equally divide the total bandwidth of the system for transmission;
step S05: in step S04, the priority is decreased after the node completes transmission, and the node which does not perform transmission repeats steps S02 to S04, so that the transmission of all node data in the system can be completed.
In the existing scheme, a test system comprises a main control unit, and the main control unit uniformly allocates bandwidth for synchronous parameter acquisition and asynchronous parameter acquisition according to user requirements to perform periodic transmission. When the requirement of the asynchronous parameter data bandwidth is high, the main control module must reserve a large bandwidth for the asynchronous parameter transmission. In a trial flight shelf, asynchronous data may have a narrow transmission time window, resulting in a large waste of system bandwidth. Meanwhile, in the prior art, a central main control module is needed, the acquisition scheme and the acquired data downloading of the acquisition equipment are both needed to be carried out by the main control module, and if the main control module fails, the test system fails, and the whole test system fails.
The self-adaptive data transmission method of the invention is based on two or more than two synchronous parameter collectors and asynchronous parameter collectors in a daisy chain structure to generate UDP-based data packets. And then all nodes generate a data transmission sequence between the nodes in a self-adaptive manner based on bandwidth negotiation without intervention of a main control node.
The invention has the beneficial effects that:
(1) the invention can meet the requirements of acquisition and recording of sensor parameters, avionic parameters, GPS parameters and flight control parameters in flight tests.
(2) The test system of the invention does not need a transmission main control module to carry out bandwidth allocation and transmission time sequence control. The cost of the test flight test system is reduced, the construction flexibility of the test system is improved, and the test flight efficiency is improved.
(3) The invention adopts a daisy chain architecture, no main control unit is arranged in the architecture, and each test unit self-adaptively negotiates bandwidth to transmit data according to the transmission requirement; the invention can self-adaptively distribute the bandwidth for the transmission of the synchronous parameters and the asynchronous parameters, thereby improving the reliability and the bandwidth utilization rate of the system and improving the flexibility of the system.
Drawings
FIG. 1 is a functional block diagram of a data acquisition system;
FIG. 2 is a functional block diagram of a data acquisition module;
fig. 3 is a flow chart of data transmission according to the present invention.
Detailed Description
Example 1:
a data acquisition system with a daisy chain structure is shown in figure 1 and comprises an analog quantity signal collector, a flight control parameter signal collector, an avionic bus collector and a GPS collector which are connected according to a daisy chain, wherein the analog quantity signal collector is used for collecting sensor output signals on a plane, the flight control parameter signal collector is connected with a flight control output interface on the plane, the avionic bus collector is connected with a flight control electrical interface on the plane, and the GPS collector is connected with a GPS antenna on the plane.
The invention designs a single collector, and each unit is provided with an independent collecting circuit. And each collector packages and sends the collected data by UDP. All collectors are connected in a daisy chain, each collector being treated as a node in the daisy chain. The invention adopts a decentralized test data transmission structure, and can meet the requirements of acquisition and recording of sensor parameters, avionic parameters, GPS parameters and flight control parameters in a flight test. The test system of the invention does not need a transmission main control module to carry out bandwidth allocation and transmission time sequence control. The cost of the test flight test system is reduced, the construction flexibility of the test system is improved, and the test flight efficiency is improved.
Example 2:
in this embodiment, optimization is performed on the basis of embodiment 1, the devices of the present invention are connected in a daisy chain manner, and each device has two gigabit ethernet ports. The network port undertakes the functions of data transmission and data reception. The network communication module includes:
a. a network PHY driver;
b. network MAC logic;
c. network application layer logic;
d. network data receiving buffer management;
e. managing a network data transmission buffer area;
IEEE1588 Primary role logic;
IEEE1588 Slave role logic.
The invention adopts a decentralized test data transmission structure, and can meet the requirements of acquisition and recording of sensor parameters, avionic parameters, GPS parameters and flight control parameters in a flight test. The test system of the invention does not need a transmission main control module to carry out bandwidth allocation and transmission time sequence control. The cost of the test flight test system is reduced, the construction flexibility of the test system is improved, and the test flight efficiency is improved.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
in this embodiment, optimization is performed on the basis of embodiment 1 or 2, a functional component module of a single data acquisition module is shown in fig. 2, and a system frame is a necessary frame of the device and is used for completing the basis of device networking, output transmission control, data recording, user interface and the like. On the basis, the system frame comprises a specific synchronous parameter/asynchronous parameter acquisition module according to the specific functions of the acquisition device.
The multifunctional frame is designed for expanding the acquisition capacity of the system frame, and is designed for 8-channel analog acquisition and excitation output aiming at analog acquisition. If the system is a flight control/avionic/GPS collector, the bus and digital signal collection can be continuously added.
As shown in fig. 2, the system frame includes a system frame control module, a setup management module, a file management module, a system frame communication module, a real-time transmission module, a network port communication module, a real-time transmission module, a recording module, a sensor excitation module, and a synchronous/asynchronous parameter acquisition module; the multifunctional frame comprises a subframe communication module, a subframe control module, a setup management module, a real-time transmission module, a sensor excitation module and a synchronous parameter/asynchronous parameter acquisition module.
The system frame control module is used for controlling the setup management module to complete the distribution of a preset instruction of a user and controlling the file management module to complete the initialization of a file system to wait for entering a real-time recording state; and if the system frame communication module finishes time service, data acquisition is started, the real-time transmission module starts real-time data transmission, the real-time data is recorded and sent out by the internet access communication module, and meanwhile, the real-time data sent by other nodes is received and enters the file recording module through the real-time transmission module to be recorded.
Core module for controlling module type system work by system frame
a) Completing system power-on initialization, and controlling a setup management module to complete the distribution of a user preset instruction; controlling a file management module to complete the initialization of a file system and waiting to enter a real-time recording state;
b) controlling each module of the system to carry out real-time state;
c) all the sub-function modules start to work in parallel: the communication module completes time service work; the data acquisition module starts data acquisition; the real-time data transmission module starts real-time data transmission, and the real-time data is recorded and simultaneously sent out by the internet access communication module; meanwhile, real-time data sent by other nodes are received and enter a recording module for recording through a real-time transmission module;
d) and responding to a control instruction sent by a user through the network port, designating the target object module to work according to a preset time sequence, and finishing sending a response data packet.
The Setup management module is used for storing register contents, real-time data transmission instructions, real-time data transmission formats, time sequences and other contents predetermined by a user.
The real-time transmission module is used for transmitting the AD data and the function frame to acquire the AD data in a real-time state, and the internet access communication module receives the data and transmits the appointed data to a sending buffer area of the internet access communication module and a data storage buffer area of the file recording module at the appointed time according to a packet format defined by a user in advance.
As shown in fig. 2, the daughter board is an extension of the system chassis, the functionality is controlled by the system chassis, and data must be exported to the system chassis. The system frame function frame communication module realizes the following control:
a) the system frame sends a timing control;
b) the system frame sends instruction analysis and data control;
c) receiving time sequence control by the system frame data;
d) the system frame receives instruction analysis and data distribution control;
e) the function block sends a timing control;
f) the function box sends instruction analysis and data control;
g) the function block receives the sequential control;
h) the function block receives instruction analysis and data distribution control;
i) and controlling the transmission of the function block data buffer.
The invention adopts a decentralized test data transmission structure, and can meet the requirements of acquisition and recording of sensor parameters, avionic parameters, GPS parameters and flight control parameters in a flight test. The test system of the invention does not need a transmission main control module to carry out bandwidth allocation and transmission time sequence control. The cost of the test flight test system is reduced, the construction flexibility of the test system is improved, and the test flight efficiency is improved.
Other parts of this embodiment are the same as those of embodiment 1 or 2, and thus are not described again.
Example 4:
a self-adaptive transmission method of a daisy chain structure is characterized in that a UDP-based data packet is generated based on two or more synchronous parameter collectors and asynchronous parameter collectors in the daisy chain structure; as shown in fig. 3, the method mainly comprises the following steps:
s00: according to the test requirements, configuring each node on the daisy chain, setting the number of parameters and the sampling frequency of each parameter, and designating one or more nodes on the chain as recording nodes;
s01: for the periodic parameters, occupying a fixed bandwidth according to a sampling rate, and periodically sending data to the recording node; for the asynchronous event parameter, go to step S02;
s02: all asynchronous parameter acquisition nodes compile UDP packets and send data transmission bandwidth demand information to other nodes except the asynchronous parameter acquisition nodes.
S03: after all nodes on the daisy chain receive the requirements sent by all nodes except the nodes, the transmission bandwidth requirements of all the nodes including the nodes are sequenced;
s04: in the next sampling period, the first four nodes with the most transmission bandwidth requirements transmit via occupied bandwidth. Wherein the node with the most transmission demand will occupy 1/2 of the total available bandwidth of the system for transmission. The node requiring the second will take 1/4 of the total system bandwidth for transmission. The remaining two nodes score the final bandwidth of 1/4.
S05: after the transmission of the node that has completed the transmission in step S04 is completed, the priority is decreased, and the steps S02 to S04 are repeated if no transmission is performed in step S04, so that the data transmission of all nodes in the system can be completed.
In this mode, the test system does not require a transmission master control module for bandwidth allocation and transmission timing control. The cost of the test flight test system is reduced, the construction flexibility of the test system is improved, and the test flight efficiency is improved.
The invention relates to a method for performing bandwidth coordination by using UDP packets and performing transmission according to bandwidth division transmission priority. The test system of the invention does not need a transmission main control module to carry out bandwidth allocation and transmission time sequence control. The cost of the test flight test system is reduced, the flexibility of the structure of the test system is improved, and the test flight efficiency is improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modifications and equivalent variations of the above embodiment according to the technical spirit of the present invention are within the scope of the present invention.
Claims (1)
1. A self-adaptive transmission method of a daisy chain structure is realized based on a data acquisition system of the daisy chain structure, wherein the data acquisition system of the daisy chain structure comprises an analog quantity signal collector, a flight control parameter signal collector, an avionic bus collector and a GPS collector which are connected according to a daisy chain, the analog quantity signal collector collects output signals of an onboard sensor, the flight control parameter signal collector is connected with an onboard flight control output interface, the avionic bus collector is connected with an onboard aviation electrical interface, and the GPS collector is connected with an onboard GPS antenna; the network communication module of the data acquisition system comprises a network PHY drive, a network MAC logic, a network application layer logic, a network data receiving and buffering management, a network data sending buffer area management, an IEEE1588 master role logic and an IEEE1588 slave role logic; the system comprises a data acquisition module, a data acquisition module and a data processing module, wherein the data acquisition module comprises a system frame and a multifunctional frame, and the system frame is used for completing equipment networking, output transmission control, data recording and a user interface; the system frame comprises a synchronous parameter/asynchronous parameter acquisition module; the multifunctional frame is used for 8-channel analog quantity acquisition and excitation output; the system frame comprises a system frame control module, a setup management module, a file management module, a system frame communication module, a network port communication module, a real-time transmission module, a recording module, a sensor excitation module and a synchronous parameter/asynchronous parameter acquisition module; the multifunctional frame comprises a subframe communication module, a subframe control module, a setup management module, a real-time transmission module, a sensor excitation module and a synchronous parameter/asynchronous parameter acquisition module; the system frame control module is used for controlling the setup management module to complete the distribution of a user preset instruction and controlling the file management module to complete the initialization of a file system to wait for entering a real-time recording state; if the system frame communication module finishes time service, data acquisition is started, the real-time transmission module starts real-time data transmission, the real-time data is sent out by the internet access communication module while being recorded, and meanwhile, the real-time data sent by other nodes is received and enters the file recording module for recording through the real-time transmission module; the setup management module is used for storing register contents, real-time data transmission instructions, real-time data sending formats and time sequence contents which are preset by a user; the real-time transmission module is used for transmitting the AD data, the AD data collected by the functional frame and the data received by the network port communication module to a sending buffer area of the network port communication module at a specified time according to a packet format in a real-time state and a data storage buffer area of the file recording module; the method is characterized in that a UDP-based data packet is generated based on more than two synchronous parameter collectors and asynchronous parameter collectors in a daisy chain structure; the method mainly comprises the following steps:
step S00: setting parameter sampling frequency of nodes on the daisy chain, and appointing one or more nodes on the chain as recording nodes;
step S01: aiming at the periodic parameters, occupying a fixed bandwidth according to a sampling rate, and periodically sending data to a recording node;
step S02: aiming at asynchronous parameters, all asynchronous parameter acquisition nodes compile UDP packets and send data transmission bandwidth demand information to other nodes;
step S03: after all nodes on the daisy chain receive the requirements sent by other nodes, the transmission bandwidth requirements of all the nodes including the nodes are sequenced;
step S04: in the next sampling period, the first four nodes with the most transmission bandwidth requirements are transmitted through occupied bandwidth; wherein, the node in the first order will transmit 1/2 occupying the total bandwidth of the system; the second node in the sequence will occupy 1/4 of the total bandwidth of the system for transmission; sequencing 1/4 of the third node and the fourth node to equally divide the total bandwidth of the system for transmission;
step S05: in step S04, the priority of the node is decreased after the node completes transmission, and the node that does not perform transmission repeats steps S02 to S04, so that the transmission of all node data in the system can be completed.
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