CN115001564B - Real-time road picking method for telemetry data of solid carrier - Google Patents

Abstract

The invention discloses a real-time road picking method for telemetry data of a solid carrier, which is implemented according to the following steps: step 1, preprocessing telemetry data; step 2, designing a mould sub-frame router; step 3, designing a circulating circuit picker; step 4, performing frequency-reducing output on the telemetry data; and 5, framing the picking result. The invention divides the telemetry data content into a mode subframe structure and a circulating sampling structure, designs a picking strategy on the basis, can respectively frame or jointly frame two types of data, adapts to different output requirements and ensures the flexibility of software processing.

Description

Real-time road picking method for telemetry data of solid carrier

Technical Field

The invention belongs to the technical field of aerospace measurement and control methods, and particularly relates to a real-time road picking method for telemetry data of a solid carrier.

Background

The solid carrier adopts vehicle-mounted mobile emission, has stronger near-ground orbit carrying capacity, and can execute miniature single-star or multi-star networking emission tasks. The preparation period is short, and the emission cost is low, so that the method has very competitive power in the field of international commercial aerospace emission. In the implementation process of the mission, a tester needs to monitor the flight state or perform fault analysis through telemetry data downloaded by a carrier, and telemetry processing is generally divided into real-time processing, quasi-real-time processing and post-processing according to working time sequence due to various types of telemetry parameters of the carrier, complex data structure and huge data volume. The real-time processing is to select key parameters, such as pressure, rotating speed and speed, which partially reflect the real-time flight state of the carrier from the real-time telemetry data when the flight test task is implemented; and judging instructions of key events in the flight process of the carrier, such as a shutdown instruction and a separation instruction, and sending the instructions to a command control center for processing and displaying so as to be monitored by command and test personnel in real time and serve as the basis of real-time command decisions. And other parameters unsuitable for real-time processing are processed in a post-processing link. Based on the above reasons, the received original telemetry data needs to be preprocessed, the data to be processed and displayed in real time is picked up, and the data to be processed and displayed in real time is recombined into an original picked-up data frame, which is used as the input of the subsequent real-time processing software. Because the solid carrier adopts a mode subframe structure based on frame counting, each coder is independently coded, the sampling frequency of various telemetry parameters is different, and the routing data is required to be adjusted from the telemetry data according to different assessment indexes of each task, so that the software variation is large, the delivery cycle of the product is prolonged, and the product development cost is increased.

Disclosure of Invention

The invention aims to provide a real-time path picking method for telemetry data of a solid carrier, which can meet the double requirements of software flexibility and stability, reduce software development time and improve task preparation efficiency.

The technical scheme adopted by the invention is that the real-time road picking method for the telemetry data of the solid carrier is implemented according to the following steps:

step 1, preprocessing telemetry data;

step 2, designing a mould sub-frame router;

step 3, designing a circulating circuit picker;

step 4, performing frequency-reducing output on the telemetry data;

and 5, framing the picking result.

The present invention is also characterized in that,

the step 1 specifically comprises the following steps:

the content of the data packet is arranged, multi-frame data are decomposed into single-frame data, the validity of the data is judged according to the data length and the sending time, the data with errors or overtime is discarded, and the legal data is put into a buffer area to wait for processing.

The engineering parameters downloaded in the same channel in the mode subframe have the following corresponding relation with the frame count: if the result of the current frame count mode is 1, the A parameter is transmitted in the channel, and if the result of the current frame count mode is 2, the B parameter is transmitted in the channel.

In the step 3, the data structure of the cycle sampling data in the cycle picker is as follows: the high-precision measurement data or byte stream data are downloaded from the same channel, and are all picked up or picked up according to a certain period according to the processing precision requirement.

The step 4 is specifically as follows:

and processing the telemetry data with higher frequency into the pick-up data with lower frequency according to the processing precision and the task requirement of real-time monitoring, and sending the pick-up data according to a designated interface.

The step 5 is specifically as follows:

and the selected result data is transmitted by adopting independent framing or joint framing according to different transmission requirements.

The invention has the advantages that,

1) According to the invention, telemetry data with higher frequency is combined into the original picking data frame with lower frequency through picking, so that the telemetry data quantity is greatly reduced, different sampling frequencies can be configured according to different task assessment indexes, and the processing load of subsequent software is reduced.

2) The invention divides the telemetry data content into a mode subframe structure and a circulating sampling structure, designs a picking strategy on the basis, can respectively frame or jointly frame two types of data, adapts to different output requirements and ensures the flexibility of software processing.

Drawings

FIG. 1 is a memory block diagram of telemetry data after preprocessing in accordance with the present invention;

FIG. 2 is a frame structure diagram of a CBQ of the present invention;

FIG. 3 is a diagram of engineering parameters for CBQ modulo sub-frame transmission according to the present invention;

FIG. 4 is a diagram of bus picking data sent using separate framing in accordance with the present invention;

fig. 5 is engineering parameter and switching value data transmitted by joint framing according to the present invention.

Detailed Description

The invention will be described in detail below with reference to the drawings and the detailed description.

The invention discloses a real-time road picking method for telemetry data of a solid carrier, which is implemented according to the following steps:

step 1, preprocessing telemetry data;

the step 1 specifically comprises the following steps:

the content of the data packet is arranged, multi-frame data are decomposed into single-frame data, the validity of the data is judged according to the data length and the sending time, the data with errors or overtime is discarded, and the legal data is put into a buffer area to wait for processing.

In the implementation process of the task, the telemetry data of the carrier are tidied and descrambled to be constructed into the agreed interface type which is favorable for the subsequent processing steps. And decomposing the received multi-frame data into single-frame data, judging the validity of the data according to the contents such as the data length, the sending time and the like, discarding the data with errors or overtime, and putting the legal data into a buffer area to wait for processing.

Step 2, designing a mould sub-frame router;

the engineering parameters downloaded in the same channel in the mode subframe have the following corresponding relation with the frame count: if the result of the current frame count mode is 1, the A parameter is transmitted in the channel, and if the result of the current frame count mode is 2, the B parameter is transmitted in the channel.

The modulo sub-frame is a data structure in which the engineering parameters downloaded in the same channel have a correspondence with the frame count. If the result of the current frame count mode is 1, the A parameter is transmitted in the channel, and if the result of the current frame count mode is 2, the B parameter is transmitted in the channel. Different modulo sub-frames exist in the telemetry data, each corresponding to an independent frame count. The function of the mode subframe picker is to pick out the needed engineering parameters according to the corresponding relation and wait for processing.

Step 3, designing a circulating circuit picker;

in the step 3, the data structure of the cycle sampling data in the cycle picker is as follows: the high-precision measurement data or byte stream data are downloaded from the same channel, and are all picked up or picked up according to a certain period according to the processing precision requirement.

The circularly sampled data is a data structure, and the measured data or byte stream data with higher precision is downloaded by the same channel, and has no corresponding relation with the frame count. Can be totally selected or selected according to a certain period according to the processing precision requirement. The function of the circulating picker is to pick out the needed wave channel according to the processing requirement and wait for processing.

Step 4, performing frequency-reducing output on the telemetry data;

the step 4 is specifically as follows:

and processing the telemetry data with higher frequency into the pick-up data with lower frequency according to the processing precision and the task requirement of real-time monitoring, and sending the pick-up data according to a designated interface.

The frequency reduction of the telemetry data is to process the telemetry data with higher frequency into the pick-up data with lower frequency according to the processing precision and the task requirement of real-time monitoring on the basis of the second step and the third step and send the pick-up data with lower frequency according to the appointed interface. The held principle is that the matched mode subframe data is picked only once in one processing period, namely, in a plurality of frames of telemetry data; and the data of the circulating picking way is picked once according to a specified picking way period, namely a plurality of frames, so that the purposes of reducing the data quantity and lowering the sending frequency are achieved.

And 5, framing the picking result.

The step 5 is specifically as follows:

and the selected result data is transmitted by adopting independent framing or joint framing according to different transmission requirements.

Example 1

Firstly, processing software receives telemetry data, firstly, collates and descrambles the content of a data packet to be decomposed into single-frame data, and then judges the validity of the data packet according to the following conditions:

1. and judging whether the length of the data packet is equal to the theoretical length. Discarding the current data if not equal;

2. and judging whether the synchronous code of the data packet is correct. Discarding the current data if not correct;

3. and judging whether the time mark of the data packet is correct. Comparing the time mark difference between the current data packet and the stored time mark of the previous frame data packet, if the difference is less than 1 second, further processing the current data packet, if the difference is greater than 1 second, considering that the data is interrupted, clearing the cached data to be sent, and processing from the current packet.

In the second step, the memory layout of the telemetry data processed in the preprocessing step is shown in FIG. 1, and the length of the memory layout is 112 bytes. The memory space in which bytes 49 through 96 are represented by CBQ is a gatherer subframe, the memory layout of which is shown in fig. 2. The engineering parameters of HB1 and HB2 channel transmission adopt a mode subframe structure, and the specific transmission parameters are shown in figure 3. The gatherer frame count is represented by channels SH, SM, SL. From fig. 3, it can be seen that the parameter Tzlb3 is located in the HB1 subframe, the sequence number thereof is 0, tzlb4 is located in the HB1 subframe, the sequence number thereof is 1, T3hnw1 is located in the HB1 subframe, the sequence number thereof is 15, and the present subframe is a mode 16 subframe. The parameter of HB1 channel transmission is Tzlb3 if the current frame count is 1024 and the value of 1024 modulo 16 is 0, tzlb4 if the current frame count is 1025 and the value of 1024 modulo 16 is 1, and T3hnw1 if the current frame count is 1039 and the value of 1024 modulo 16 is 15.

Thirdly, the telemetry data shown in fig. 1, wherein the memory space represented by ZX in bytes 1 to 48 is bus byte stream data, which contains a large amount of telemetry data that needs to be processed later, must be all picked up, and the memory space represented by KGL1, KGL2, KGL3 in bytes 97 to 99 is a switching value channel, which contains telemetry data related to time, can be picked up according to the required processing precision, for example, once every 16 frames.

Fourth, the down-conversion output of the telemetry data. Let the received telemetry frame rate be 488 frames/second and the required transmit frequency be 1 frame/second. Setting a frame counter to be 0, adding 1 to the count of telemetry data of each processed frame, processing only data with the frame counter value smaller than a modulus value for the modulus subframe data, and processing only the first 16 frames if the modulus value is 16 for the subsequent data. Setting a cyclic sampling counter with an initial value of 0, adding 1 to count telemetry data of each frame processed, picking up sampled data when the counter value is 0, not processing subsequent data, and resetting the cyclic sampling counter to 0 when the counter value is 15. The initial value of the group counter is set to be 0, and 1 is added to the group counter after each cycle of sampling, when the value of the group counter is increased to 30 (488/16 is approximately equal to 30), the buffered processing data is sent out, and the program is set to be in an initial state, so that the aim of reducing the sending frequency and the data quantity is achieved.

And fifthly, transmitting the single framing and the combined framing of the picking result. The result data of the picking way can be sent by adopting independent framing or joint framing according to different sending requirements. As shown in fig. 4, since the bus data requires all sampling, the sampling period is 1, when the group counter is increased to 61 (488/8 equals 61), the picking result data is sent, and the sending frequency at this time is 8 frames/second, so that the design effectively reduces the data quantity of a single frame, and the single frame belongs to single-frame framing. As shown in fig. 5, the mode subframe sampling data and the switching value sampling data are combined together, and belong to joint framing transmission, so that further processing by subsequent software is facilitated.

Claims (3)

1. The real-time routing method for the telemetry data of the solid carrier is characterized by comprising the following steps of:

step 1, preprocessing telemetry data;

step 2, designing a mould sub-frame router;

step 3, designing a circulating circuit picker;

step 4, performing frequency-reducing output on the telemetry data;

step 5, framing a picking result;

the step 1 specifically comprises the following steps:

sorting the content of the data packet, decomposing multi-frame data into single-frame data, judging the validity of the data according to the data length and the sending time, discarding the data with errors or overtime, and putting the legal data into a buffer area to wait for processing;

the engineering parameters downloaded in the same channel in the mode subframe have the following corresponding relation with the frame count: if the result of the current frame counting mode is 1, the A parameter is transmitted in the channel, and if the result of the current frame counting mode is 2, the B parameter is transmitted in the channel;

the data structure of the cyclic sampling data in the cyclic picker in the step 3 is as follows: the high-precision measurement data or byte stream data are downloaded from the same channel, and are all picked up or picked up according to a certain period according to the processing precision requirement.

2. The method for real-time routing of telemetry data of a solid carrier according to claim 1, wherein the step 4 is specifically:

and processing the telemetry data with higher frequency into the pick-up data with lower frequency according to the processing precision and the task requirement of real-time monitoring, and sending the pick-up data according to a designated interface.

3. The method for real-time routing of telemetry data of a solid carrier according to claim 1, wherein the step 5 is specifically:

and the selected result data is transmitted by adopting independent framing or joint framing according to different transmission requirements.

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