CN115001564A

CN115001564A - Real-time route selection method for telemetering data of solid carrier

Info

Publication number: CN115001564A
Application number: CN202210543090.3A
Authority: CN
Inventors: 石峰; 张建海; 张冬波; 淡鹏; 黄普; 符叶丹; 黄刚
Original assignee: China Xian Satellite Control Center
Current assignee: China Xian Satellite Control Center
Priority date: 2022-05-18
Filing date: 2022-05-18
Publication date: 2022-09-02
Anticipated expiration: 2042-05-18
Also published as: CN115001564B

Abstract

The invention discloses a real-time route selecting method for telemetering data of a solid carrier, which is implemented according to the following steps: step 1, preprocessing telemetering data; step 2, designing a modulus subframe road picker; step 3, designing a circulating route selecting device; step 4, performing frequency reduction output on the telemetering data; and 5, selecting a path and framing the result. The invention divides the telemetering data content into a module subframe structure and a cycle sampling structure, designs a path selection 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 route selection method for telemetering 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 route selection method for telemetering data of a solid carrier.

Background

The solid carrier adopts vehicle-mounted mobile transmission, has strong near-earth track carrying capacity, and can execute a miniature single-satellite or multi-satellite networking transmission task. The method has the advantages of short preparation period and low emission cost, and is very competitive in the field of international commercial space emission. In the implementation process of a task, a tester needs to monitor the flight state or perform fault analysis through telemetering data downloaded by a carrier, and because the carrier telemetering parameters are various, the data structure is complex, and the data volume is huge, the telemetering processing is generally divided into real-time processing, quasi-real-time processing and post-processing according to the working time sequence. The real-time processing is to select part of key parameters, such as pressure, rotating speed and speed, reflecting the real-time flight state of the carrier from the real-time telemetering data when a flight test task is implemented; and judging instructions of key events in the flight process of the carrier, such as shutdown instructions and separation instructions, sending the instructions to a command control center for processing and displaying, so that commands and testers can monitor the instructions in real time and the instructions are used as the basis for real-time command decision making. And other parameters which are not suitable for real-time processing are processed in a post-processing link. For the above reasons, it is necessary to preprocess the received original telemetry data, select the path of the data to be processed and displayed in real time, and recombine the data into the original path-selected data frame as the input of the subsequent real-time processing software. Because the solid carrier adopts a mode subframe structure based on frame counting, each encoder is independently coded, the sampling frequency of various telemetering parameters is different, and the route selection data needs to be adjusted from the telemetering data according to different assessment indexes of each task, so that the software change 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 route selecting method for telemetering data of a solid carrier, which can meet the dual 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 route selecting method for the telemetering data of the solid carrier is implemented according to the following steps:

step 1, preprocessing telemetering data;

step 2, designing a way picker for the module subframe;

step 3, designing a circulating route selecting device;

step 4, performing frequency reduction output on the telemetering data;

and 5, selecting a path and framing the result.

The present invention is also characterized in that,

the step 1 specifically comprises the following steps:

the content of the data packet is sorted, multi-frame data is decomposed into single-frame data, the legality of the data is judged according to the data length and the sending time, wrong or overtime data are discarded, and the legal data are placed into a buffer area to wait for processing.

The corresponding relation between the engineering parameters downloaded in the same channel in the mode subframe and the frame count is as follows: if the result of counting digital-analog 16 at the current frame is 1, the A parameter is transmitted in the channel, and if the result of counting digital-analog 16 at the current frame is 2, the B parameter is transmitted in the channel.

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

The step 4 specifically comprises the following steps:

according to the processing precision and the task requirement of real-time monitoring, the telemetering data with higher frequency is processed into path selection data with lower frequency, and the path selection data is sent according to a specified interface.

The step 5 specifically comprises the following steps:

and the result data of the path selection is sent by adopting independent framing or combined framing according to different sending requirements.

The beneficial effect of the invention is that,

1) the invention combines the telemetering data with higher frequency into the original route selection data frame with lower frequency through route selection, greatly reduces the telemetering data amount, can configure different sampling frequencies according to different task assessment indexes, and lightens the processing burden of subsequent software.

2) The invention divides the telemetering data content into a module subframe structure and a cycle sampling structure, designs a path selection 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 diagram of a memory structure of pre-processed telemetry data according to the present invention;

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

FIG. 3 is a diagram of engineering parameters for CBQ mode subframe transmission according to the present invention;

FIG. 4 illustrates bus routing data sent using individual framing according to the present invention;

fig. 5 shows the engineering parameters and the switching value data transmitted by the present invention using joint framing.

Detailed Description

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

The invention relates to a real-time route selection method for telemetering data of a solid carrier, which is implemented according to the following steps:

step 1, preprocessing telemetering data;

the step 1 specifically comprises the following steps:

During the implementation process of the task, the telemetering data of the carrier is sorted and descrambled to form an appointed interface type which is beneficial to the subsequent processing steps. Decomposing received multi-frame data into single-frame data, judging the legality of the data according to the data length, the sending time and other contents, discarding wrong or overtime data, and putting the legal data into a buffer area for waiting processing.

Step 2, designing a modulus subframe road picker;

The modulus subframe is a data structure, and the corresponding relation exists between the downloaded engineering parameters in the same channel and the frame counting. If the result of counting digital-analog 16 at the current frame is 1, the A parameter is transmitted in the channel, and if the result of counting digital-analog 16 at the current frame is 2, the B parameter is transmitted in the channel. There are different modulo subframes in the telemetry data, each corresponding to a separate frame count. The function of the model subframe road selector is to pick out the required engineering parameters according to the corresponding relation and wait for processing.

Step 3, designing a circulating route selecting device;

The cyclic sampling data is a data structure, and measurement data or byte stream data with higher precision is downloaded in the same wave channel, and has no corresponding relation with frame counting. Can be picked out completely or according to a certain period according to the processing precision requirement. The function of the circular picker is to pick out the required wave channel according to the processing requirement and wait for processing.

Step 4, performing frequency reduction output on the telemetering data;

the step 4 specifically comprises the following steps:

And the frequency reduction of the telemetering data is to process the telemetering data with higher frequency into route selection data with lower frequency to be sent according to a specified interface based on the second step and the third step according to the processing precision and the task requirement of real-time monitoring. The principle of grasping is that in a processing period, namely a plurality of frames of telemetering data, the way of the modulus subframe data is selected once; the data of the circular route selection is selected once according to a specified route selection period, namely a plurality of frames, so that the purposes of reducing the data volume and reducing the sending frequency are achieved.

And 5, selecting a path and framing the result.

The step 5 specifically comprises the following steps:

Example 1

Firstly, processing software receives telemetering data, firstly, the content of a data packet is sorted and descrambled to be decomposed into single-frame data, and then, the legality of the data packet is judged according to the following conditions:

1. and judging whether the length of the data packet is equal to the theoretical length. If not, discarding the current data;

2. and judging whether the synchronous code of the data packet is correct or not. If not, discarding the current data;

3. and judging whether the time mark of the data packet is correct or not. And comparing the time scale difference value of the current data packet with the time scale difference value of the stored previous frame data packet, if the difference value is less than 1 second, further processing the current data packet, and if the difference value is more than 1 second, considering that the data is interrupted, clearing the cached data to be sent, and starting 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 memory layout is 112 bytes in length. The memory space of bytes 49 to 96, denoted CBQ, is the editor subframe, and the memory layout is shown in fig. 2. The engineering parameters of HB1 and HB2 channel transmission adopt a mode subframe structure, and specific transmission parameters are shown in fig. 3. The codec frame count is represented by channels SH, SM, SL. It can be seen from fig. 3 that the parameter Tzlb3 is located in HB1 subframe with sequence number 0, the Tzlb4 is located in HB1 subframe with sequence number 1, the T3hnw1 is located in HB1 subframe with sequence number 15, and this subframe is a modulo 16 subframe. The HB1 channel transmitted parameter is Tzlb3 if the current frame count is 1024, the 1024 modulo 16 value is 0, the HB1 channel transmitted parameter is Tzlb4 if the current frame count is 1025, the 1024 modulo 16 value is 1, and the HB1 channel transmitted parameter is T3hnw1 if the current frame count is 1039, the 1024 modulo 16 value is 15.

Third, in the telemetry data shown in fig. 1, the memory space represented by ZX in bytes 1 to 48 is bus byte stream data, which contains a large amount of telemetry data to be subsequently processed, and the memory space represented by KGL1, KGL2, and KGL3 in bytes 97 to 99 is a switching channel, which contains time-related telemetry data, and can be routed according to a certain period, for example, once every 16 frames, according to the required processing accuracy.

And fourthly, the telemetering data is subjected to frequency reduction output. The frame rate of the received telemetry data is 488 frames/second, and the required transmission frequency is 1 frame/second. And setting a frame counter, wherein the initial value is 0, adding 1 to each frame of telemetry data count, only processing the data with the value of the frame counter being less than the module value for the module subframe data, and not processing the subsequent data, if the module is 16, only processing the first 16 frames. Setting a cycle sampling counter, wherein the initial value is 0, adding 1 to each frame of telemetering data counting, when the counter value is 0, selecting a path for sampling data, not processing subsequent data, and when the count value is equal to 15, resetting the cycle sampling counter to be 0. And setting a group counter, wherein the initial value is 0, adding 1 to the group counter every time of cyclic sampling, sending out the buffered processing data when the value of the group counter is increased to 30(488/16 is equal to 30), and setting the program in an initial state so as to achieve the purposes of reducing the sending frequency and reducing the data volume.

And fifthly, selecting the independent framing and the joint framing of the path result to send. The result data of the path selection can be sent by adopting independent framing or combined framing according to different sending requirements. As shown in fig. 4, since the bus data requires all samples, the sampling period is 1, and when the group counter is increased to 61 (488/8 equals 61), the routing result data is transmitted at a transmission frequency of 8 frames/second, which effectively reduces the data amount of a single frame and belongs to single group frame transmission. As shown in fig. 5, the modulus subframe sampling data and the switching value sampling data are combined together, and belong to joint framing transmission, so that the subsequent software can further process the data conveniently.

Claims

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

step 1, preprocessing telemetering data;

step 2, designing a modulus subframe road picker;

step 3, designing a circulating road picker;

step 4, performing frequency reduction output on the telemetering data;

and 5, selecting a path and framing the result.

2. The method for real-time routing of telemetry data for a solid state vehicle of claim 1, wherein step 1 is specifically:

3. The method of claim 2, wherein the following correspondence exists between the engineering parameters downloaded in the same channel in the modular subframe and the frame count: if the result of counting digital-analog 16 at the current frame is 1, the A parameter is transmitted in the channel, and if the result of counting digital-analog 16 at the current frame is 2, the B parameter is transmitted in the channel.

4. The method for real-time routing of telemetry data of a solid state vehicle as claimed in claim 1, wherein the data structure of the cyclic sampling data in the cyclic router in step 3 is as follows: the high-precision measurement data or byte stream data are downloaded from the same wave channel, and are all picked out or picked out according to a certain period according to the processing precision requirement.

5. The method for real-time routing of telemetry data of a solid state vehicle as claimed in claim 1, wherein the step 4 is specifically:

6. The method for real-time routing of telemetry data of a solid state vehicle as claimed in claim 1, wherein the step 5 is specifically: