CN108683698B - Multi-rate multi-channel downlink telemetering data combining and shunting processing system and method - Google Patents
Multi-rate multi-channel downlink telemetering data combining and shunting processing system and method Download PDFInfo
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Abstract
The invention discloses a multi-rate multi-channel downlink telemetering data combining and shunting processing system and a method thereof, wherein the system comprises: the asynchronous dispatching unit and the synchronous dispatching unit; the asynchronous dispatching unit comprises a plurality of shunting modules, and each shunting module comprises a receiving buffer module, a first-level shunting module, a ground buffer module and a relay buffer module; the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits various downlink telemetering data to the first-stage shunt module; the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module; and the synchronous scheduling unit is used for combining and dividing various downlink telemetering data in the ground cache module and the relay cache module. The invention solves the problems of multi-channel downlink telemetering data combining and shunting and independent switching rate.
Description
Technical Field
The invention belongs to the technical field of space electronics, and particularly relates to a multi-rate multi-channel downlink telemetering data combining and shunting processing system and method.
Background
The requirements of the existing satellite downlink telemetry application are more and more complex, and not only the requirement of combining a plurality of telemetry downlink data sources exists, but also the requirement of shunting different data contents of a plurality of answering machines exists. On the basis, the downlink rates of all the transponders are required to be switchable on track, and downlink telemetered data are ensured to be downlink according to the uninterrupted time sequence required by the transponders, and the requirements completely exceed the processing capacity of the traditional combiner, so that the processing capacity of the existing combiner cannot meet the requirements.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, a multi-rate multi-channel downlink telemetering data combining and shunting processing system and a multi-rate multi-channel downlink telemetering data combining and shunting processing method are provided, and the problems of multi-channel downlink telemetering data combining and shunting and independent switching rate are solved.
The purpose of the invention is realized by the following technical scheme: according to one aspect of the invention, a multi-rate multi-channel downlink telemetry data combining and splitting processing system is provided, which comprises: the asynchronous dispatching unit and the synchronous dispatching unit; the asynchronous dispatching unit comprises a plurality of shunting modules, and each shunting module comprises a receiving buffer module, a first-level shunting module, a ground buffer module and a relay buffer module; the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits various downlink telemetering data to the first-stage shunt module; the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module; and the synchronous scheduling unit is used for combining and dividing various downlink telemetering data in the ground cache module and the relay cache module.
In the multi-rate multi-channel downlink telemetry data combining and shunting processing system, the synchronous scheduling unit comprises a combining and shunting synchronous scheduling state machine, a scheduling pulse and frequency division clock generator, a time manager, a ping-pong buffer and a relay ping-pong buffer; the time manager receives a certain time signal and a certain frequency signal, generates satellite time according to the certain time signal and the certain frequency signal, and transmits the satellite time to the combiner and shunt synchronous scheduling state machine; the scheduling pulse and frequency division clock generator outputs a frequency division clock and a scheduling pulse according to the rate switching instruction, transmits the frequency division clock and the scheduling pulse to the combiner and shunt synchronous scheduling state machine, and simultaneously transmits the frequency division clock and the scheduling pulse to the ground ping-pong buffer and the relay ping-pong buffer; the combined path and shunt synchronous scheduling state machine determines scheduling time according to the scheduling pulse, and at the scheduling time, the combined path and shunt synchronous scheduling state machine puts satellite time into an insertion domain in a downlink data frame format; the combined path and shunt path synchronous scheduling state machine inquires whether data exists in a ground cache module or a relay cache module of the asynchronous scheduling unit at the corresponding scheduling time according to the type of the scheduling pulse; when no data exists, the combined path and shunt path synchronous scheduling state machine automatically generates an idle frame, and the currently generated idle frame is output to a ground ping-pong buffer or a relay ping-pong buffer according to the type of the current scheduling pulse; when data exist, the combining and shunting synchronous scheduling state machine carries the corresponding ground ping-pong buffer or relay ping-pong buffer to the data of the ground buffer module or the relay buffer module; performing ping-pong switching on the ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; reading downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock; performing ping-pong switching on the relay ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; and reading the downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock.
In the above multi-rate multi-channel downlink telemetry data combining and splitting processing system, the receiving and buffering module receiving various types of downlink telemetry data transmitted by computers inside a satellite includes: and the receiving buffer module judges whether to receive various downlink telemetering data transmitted by each computer in the satellite according to the data buffer state of the receiving buffer module and the judgment basis.
In the multi-rate multi-channel downlink telemetry data combining and splitting processing system, the judgment basis is as follows: when the channel sends a data request signal with low level, namely, the channel applies for data transmission, and the receiving buffer module judges that the buffer state is empty, the receiving buffer module drives the response signal with low level, allows data transmission and completes data receiving of one frame; when the receiving buffer module judges that the buffer state is full, the transmission is not allowed, and the response signal keeps high level until the data in the buffer is successfully sent out.
In the above system, the first-stage shunting module performs shunting processing on various downlink telemetering data according to a downlink channel, and sends the downlink telemetering data to the ground buffer module and the relay buffer module respectively, and the system comprises: after receiving a frame of data, the receiving buffer module judges whether the frame of data is a ground frame or a relay frame; if the frame is a ground frame, inquiring whether the ground buffer module is empty, carrying the ground frame if the ground buffer module is empty, and waiting and not stopping inquiring if the ground frame is not empty; if the relay frame is the relay frame, inquiring whether the relay buffer module is empty, carrying the relay frame if the relay buffer module is empty, and waiting for continuous inquiry if the relay buffer module is not empty.
In the multi-rate multi-channel downlink telemetering data combining and shunting processing system, the time manager receives 1PPS and 1MHz signals, generates satellite time according to the 1PPS and 1MHz signals, and transmits the satellite time to the combining and shunting synchronous scheduling state machine.
In the multi-rate multi-channel downlink telemetry data combining and shunting processing system, the combining and shunting synchronous scheduling state machine inquires whether data exists in a ground cache module or a relay cache module of an asynchronous scheduling unit at a corresponding scheduling time according to the type of a scheduling pulse, and inquires according to the priority of a specified input channel.
In the multi-rate multi-channel downlink telemetry data combining and shunting processing system, in the synchronous scheduling combining module, whether data exists in the primary ground cache module or the relay cache module is inquired only when a scheduling pulse arrives.
In the multi-rate multi-channel downlink telemetry data combining and splitting processing system, the types of the scheduling pulse comprise a ground scheduling pulse and a relay scheduling pulse.
In the multi-rate multi-channel downlink telemetering data combining and shunting processing system, if the current comes is a ground scheduling pulse, whether data exists in a ground cache module corresponding to each channel is inquired according to the priority of a specified channel, the data with high priority and accordance is scheduled into a ground ping-pong buffer, and meanwhile, a current maintenance time code is set; if the current is to schedule the relay, inquiring whether the relay cache module corresponding to each channel has data according to the priority of the appointed channel, scheduling the data with high priority and accordance with the priority into the relay ping-pong buffer, and setting the current maintenance time code.
According to another aspect of the present invention, there is also provided a multi-rate multi-channel downlink telemetry data combining and splitting processing method, including the following steps:
the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits the various downlink telemetering data to the first-stage shunt module;
the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module;
and the synchronous scheduling unit is used for combining and dividing various downlink telemetering data in the ground cache module and the relay cache module.
Compared with the prior art, the invention has the following beneficial effects:
the invention designs a multi-rate multi-channel downlink telemetering data combining and shunting processing system, which realizes the combining and shunting of multiple telemetering data sources to multiple data destination ends, simultaneously supports the on-track independent switching of each downlink channel rate, and solves the problems of multi-channel downlink telemetering data combining and shunting and independent switching rate.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of a multi-rate multi-channel downlink telemetry data combining and splitting processing system according to an embodiment of the present invention;
FIG. 2(a) is a graph of the output of a scheduled pulse to ground at 64Kbps provided by an embodiment of the present invention;
FIG. 2(b) is a graph of the output of the scheduling pulse for a 4kbps relay according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a block diagram of a multi-rate multi-channel downlink telemetry data combining and splitting processing system according to an embodiment of the present invention. As shown in fig. 1, the multi-rate multi-channel downlink telemetry data combining and splitting processing system includes: the asynchronous dispatching unit and the synchronous dispatching unit; wherein the content of the first and second substances,
the asynchronous dispatching unit comprises a plurality of shunting modules, and each shunting module comprises a receiving buffer module, a first-level shunting module, a ground buffer module and a relay buffer module; the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits various downlink telemetering data to the first-stage shunt module; the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module;
the synchronous scheduling unit comprises a combiner and shunt synchronous scheduling state machine, a scheduling pulse and frequency division clock generator, a time manager, a ping-pong buffer to ground and a ping-pong buffer to relay; wherein the content of the first and second substances,
the time manager receives a certain time signal and a certain frequency signal, generates satellite time according to the certain time signal and the certain frequency signal, and transmits the satellite time to the combiner and shunt synchronous scheduling state machine; in specific implementation, the time manager receives the 1PPS and the 1MHz signals, generates satellite time according to the 1PPS and the 1MHz signals, and transmits the satellite time to the combiner and shunt synchronous scheduling state machine.
The scheduling pulse and frequency division clock generator outputs a frequency division clock and a scheduling pulse according to the rate switching instruction, transmits the frequency division clock and the scheduling pulse to the combiner and shunt synchronous scheduling state machine, and simultaneously transmits the frequency division clock and the scheduling pulse to the ground ping-pong buffer and the relay ping-pong buffer.
The combined path and shunt synchronous scheduling state machine determines scheduling time according to the scheduling pulse, and at the scheduling time, the combined path and shunt synchronous scheduling state machine puts satellite time into an insertion region of a downlink data frame format, so that satellite downlink delay uncertainty caused by uncertain transmission delay of an asynchronous scheduling region is eliminated;
the combined path and shunt path synchronous scheduling state machine inquires whether data exists in a ground cache module or a relay cache module of the asynchronous scheduling unit at the corresponding scheduling time according to the type of the scheduling pulse; when no data exists, the combined path and shunt path synchronous scheduling state machine automatically generates an idle frame, and the currently generated idle frame is output to a ground ping-pong buffer or a relay ping-pong buffer according to the type of the current scheduling pulse; when data exist, the combining and shunting synchronous scheduling state machine carries the corresponding ground ping-pong buffer or relay ping-pong buffer to the data of the ground buffer module or the relay buffer module.
Performing ping-pong switching on the ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; and reading the downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock.
Performing ping-pong switching on the relay ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; and reading the downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock. The types of the scheduling pulse comprise a ground scheduling pulse and a relay scheduling pulse.
The receiving and buffering module receives various downlink telemetering data transmitted by computers in the satellite, and the receiving and buffering module comprises the following steps: and the receiving buffer module judges whether to receive various downlink telemetering data transmitted by each computer in the satellite according to the data buffer state of the receiving buffer module and the judgment basis. Wherein, the judgment basis is as follows: when the channel sends a data request signal with low level, namely, the channel applies for data transmission, and the receiving buffer module judges that the buffer state is empty, the receiving buffer module drives the response signal with low level, allows data transmission and completes data receiving of one frame; when the receiving buffer module judges that the buffer state is full, the transmission is not allowed, and the response signal keeps high level until the data in the buffer is successfully sent out.
In the synchronous scheduling combining module, whether data exists in the primary ground cache module or the relay cache module is inquired only when a scheduling pulse arrives. If the current is a ground scheduling pulse, inquiring whether data exists in a ground cache module corresponding to each channel according to the priority of the appointed channel, scheduling the data with high priority and accordance into a ground ping-pong buffer, and simultaneously setting a current maintenance time code, so that the fixed delay (the delay is related to the rate setting, different but fixed) can be ensured later, and performing the downstream water treatment according to the synchronous scheduling; if the current is to schedule the relay, inquiring whether the relay cache module corresponding to each channel has data according to the priority of the appointed channel, scheduling the data with high priority and conformity into the relay ping-pong buffer, and setting the current maintenance time code, so that the fixed delay (the delay is related to the rate setting, different but fixed) can be ensured, and the downstream water treatment is performed according to the synchronous scheduling.
In specific implementation, as shown in fig. 1, the multi-rate multi-channel downlink telemetry data combining and splitting processing system is divided into an asynchronous scheduling unit and a synchronous scheduling unit, the asynchronous scheduling unit receives data of a plurality of input channels, each channel data includes multiple types of data, and each type of data adopts identification data to represent a designated transmission channel.
As shown in fig. 1, in the asynchronous scheduling unit, in order to adapt to the random transmission characteristics of each external interface, an asynchronous scheduling policy is used, and a receiving buffer module and a first-stage splitter are independently designed for each input channel data, and are used for splitting multiple types of data input by each channel to respective data buffers according to a specified destination downstream port; three frame buffers are provided for each input channel: receiving frame buffer, ground frame buffer and relay frame buffer. The receiving frame buffer, the ground frame buffer and the relay frame buffer can buffer one frame of transmission data respectively.
The three frame buffers are arranged here, so that a low-speed frame can be prevented from missing a scheduling period and blocking a four-wire system input interface, and a filling frame can only be inserted into a high-speed frame during the period, which is not beneficial to the utilization of a downlink bandwidth. When the receiving buffer of the four-wire system interface of the asynchronous dispatching unit is not full, the receiving buffer receives data if a request exists, and waits for the request of the four-wire system interface if no request exists. When the receive buffer is full, then no data is allowed to be received.
And the receiving buffer module judges whether to receive the data from the channel according to the data buffer state of the receiving buffer module. The judgment basis is as follows: when the channel sends a data request signal with low level, namely, the channel applies for data transmission, and the receiving buffer judges that the buffer state is empty, the response signal is driven to be with low level, data transmission is allowed, and one frame of data receiving is completed. And when the receiving cache judges that the cache state is full, the transmission is not allowed, the response signal keeps high level, and the receiving cache is empty until the data in the cache is successfully shunted to the ground cache or the relay cache of the asynchronous dispatching area, so that the data requested to be transmitted is allowed to be received.
After receiving a frame of data, the receiving buffer module judges whether the frame is a ground frame or a relay frame. If the frame is a ground frame, inquiring whether the ground buffer memory is empty, carrying the ground frame if the buffer memory is empty, and waiting and not stopping inquiring if the buffer memory is not empty;
if the relay frame is the intermediate relay frame, inquiring whether the relay buffer is empty, carrying the intermediate relay frame if the relay buffer is empty, and waiting for the uninterrupted inquiry if the relay buffer is not empty.
The ground buffer or the relay buffer of the asynchronous scheduling unit stores the data frames coming from the branches, a synchronous scheduling state machine of the combining and branching of the synchronous scheduling unit is waited for inquiring the number of the data at the time of the scheduling pulse, and the two buffers give out mark signals according to whether the data are buffered in the two buffers or not, and the two buffers are emptied after the data are taken out.
In the synchronous scheduling unit, a scheduling pulse and frequency division clock generating module is designed by a scheduling pulse and frequency division clock generator according to rate setting, and equal-interval scheduling pulses are generated, and the specific implementation mode is as follows:
as shown in fig. 2(a) and 2(b), the frame scheduling period is calculated at twice the downlink rate of the larger (e.g., ground) telemetry channel. The relay channel scheduling pulses are staggered with respect to ground. And the path with low speed adjusts the virtual and real of the scheduling pulse according to the speed ratio, and only the real pulse is scheduled.
In the synchronous scheduling module, only when a scheduling pulse arrives, the condition of the number of each cache is queried once, and the query needs to be performed according to the type of the scheduling pulse: and if the current pulse is scheduled to the ground, inquiring the ground cache of each channel according to the priority of the channels A > B > C. And if the current channel is the relay scheduling pulse, inquiring the relay cache of each channel according to the priority of the A > B > C channels. And dispatching the data with higher priority and conforming to the target into a synchronous dispatching area for processing and caching, and simultaneously inputting the current maintenance time code, so that the fixed time delay (the time delay is related to the rate setting and is different but fixed) can be ensured, and the downstream water treatment is carried out according to the synchronous dispatching.
If the scheduling pulse arrives, the output channel type corresponding buffer to which the current scheduling period belongs is inquired, and the A, B, C input channel buffer has no data, the current data is not downloaded, but a filling frame needs to be inserted into the output channel type corresponding buffer to enable the output data to be uninterrupted, and at the moment, the synchronous scheduling state organizes a frame of filling frame by itself to be filled into the output buffer, and simultaneously, a current maintenance time code is input.
As shown in fig. 1, the subsequent processing is to use a ping-pong scheduling strategy, and continuously switch and read the data frames in the two ping-pong buffers according to the scheduling period, so as to ensure that the output data is continuous, and output the data after being parallel-serial-connected to the responder of the corresponding transmission channel, which are the ground measurement and control responder and the relay measurement and control responder respectively.
The embodiment also provides a multi-rate multi-channel downlink telemetering data combining and splitting processing method, which comprises the following steps:
the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits the various downlink telemetering data to the first-stage shunt module;
the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module;
and the synchronous scheduling unit is used for combining and dividing various downlink telemetering data in the ground cache module and the relay cache module.
The embodiment designs a multi-rate multi-channel downlink telemetering data combining and shunting processing system, which realizes combining and shunting of multiple telemetering data sources to multiple data destination ends, supports on-track independent switching of each downlink channel rate, and solves the problems of combining and shunting of multi-channel downlink telemetering data and independent switching rate.
The above-described embodiments are merely preferred embodiments of the present invention, and general changes and substitutions by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (9)
1. A multi-rate multi-channel downlink telemetry data combining and splitting processing system is characterized by comprising: the asynchronous dispatching unit and the synchronous dispatching unit; wherein the content of the first and second substances,
the asynchronous dispatching unit comprises a plurality of shunting modules, and each shunting module comprises a receiving buffer module, a first-level shunting module, a ground buffer module and a relay buffer module; the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits various downlink telemetering data to the first-stage shunt module; the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module;
the synchronous scheduling unit is used for combining and shunting various downlink telemetering data in the ground cache module and the relay cache module;
the synchronous scheduling unit comprises a combiner and shunt synchronous scheduling state machine, a scheduling pulse and frequency division clock generator, a time manager, a ping-pong buffer to ground and a ping-pong buffer to relay; wherein the content of the first and second substances,
the time manager receives a certain time signal and a certain frequency signal, generates satellite time according to the certain time signal and the certain frequency signal, and transmits the satellite time to the combiner and shunt synchronous scheduling state machine;
the scheduling pulse and frequency division clock generator outputs a frequency division clock and a scheduling pulse according to the rate switching instruction, transmits the frequency division clock and the scheduling pulse to the combiner and shunt synchronous scheduling state machine, and simultaneously transmits the frequency division clock and the scheduling pulse to the ground ping-pong buffer and the relay ping-pong buffer;
the combined path and shunt synchronous scheduling state machine determines scheduling time according to the scheduling pulse, and at the scheduling time, the combined path and shunt synchronous scheduling state machine puts satellite time into an insertion domain in a downlink data frame format; the combined path and shunt path synchronous scheduling state machine inquires whether data exists in a ground cache module or a relay cache module of the asynchronous scheduling unit at the corresponding scheduling time according to the type of the scheduling pulse; when no data exists, the combined path and shunt path synchronous scheduling state machine automatically generates an idle frame, and the currently generated idle frame is output to a ground ping-pong buffer or a relay ping-pong buffer according to the type of the current scheduling pulse; when data exist, the combining and shunting synchronous scheduling state machine carries the data of the ground cache module or the relay cache module to a corresponding ground ping-pong buffer or a relay ping-pong buffer;
performing ping-pong switching on the ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; reading downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock;
performing ping-pong switching on the relay ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; and reading the downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock.
2. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 1, wherein: the receiving and buffering module receives various downlink telemetering data transmitted by computers in the satellite, and comprises the following steps: and the receiving buffer module judges whether to receive various downlink telemetering data transmitted by each computer in the satellite according to the data buffer state of the receiving buffer module and the judgment basis.
3. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 2, wherein: the judgment basis is as follows: when the channel sends a data request signal with low level, namely, the channel applies for data transmission, and the receiving buffer module judges that the buffer state is empty, the receiving buffer module drives the response signal with low level, allows data transmission and completes data receiving of one frame; when the receiving buffer module judges that the buffer state is full, the transmission is not allowed, and the response signal keeps high level until the data in the buffer is successfully sent out.
4. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 1, wherein: the first-level shunt module performs shunt processing on various downlink telemetering data according to a downlink channel, and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module, and the first-level shunt module comprises: after receiving a frame of data, the receiving buffer module judges whether the frame of data is a ground frame or a relay frame; if the frame is a ground frame, inquiring whether the ground buffer module is empty, carrying the ground frame if the ground buffer module is empty, and waiting and not stopping inquiring if the ground frame is not empty; if the relay frame is the relay frame, inquiring whether the relay buffer module is empty, carrying the relay frame if the relay buffer module is empty, and waiting for continuous inquiry if the relay buffer module is not empty.
5. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 1, wherein: and the time manager receives the 1PPS and the 1MHz signals, generates satellite time according to the 1PPS and the 1MHz signals, and transmits the satellite time to the combiner and shunt synchronous scheduling state machine.
6. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 1, wherein: and inquiring whether data exists in a ground cache module or a relay cache module of the asynchronous scheduling unit at the corresponding scheduling time according to the type of the scheduling pulse by the combined path and shunt path synchronous scheduling state machine, and inquiring according to the priority of the specified input channel.
7. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 1, wherein: the types of scheduling pulses include a ground scheduling pulse and a relay scheduling pulse.
8. The multi-rate multi-channel downlink telemetry data combining and splitting processing system of claim 7, wherein: if the current is a ground scheduling pulse, inquiring whether data exists in a ground cache module corresponding to each channel according to the priority of the appointed channel, scheduling the data with high priority and accordance into a ground ping-pong buffer, and setting a current maintenance time code; if the current is to schedule the relay, inquiring whether the relay cache module corresponding to each channel has data according to the priority of the appointed channel, scheduling the data with high priority and accordance with the priority into the relay ping-pong buffer, and setting the current maintenance time code.
9. A multi-rate multi-channel downlink telemetering data combining and splitting processing method is characterized by comprising the following steps:
the receiving buffer module receives various downlink telemetering data transmitted by computers in the satellite and transmits the various downlink telemetering data to the first-stage shunt module;
the first-stage shunt module performs shunt processing on various downlink telemetering data according to a downlink channel and respectively sends the various downlink telemetering data to the ground cache module and the relay cache module;
the synchronous scheduling unit is used for combining and shunting various downlink telemetering data in the ground cache module and the relay cache module;
the synchronous scheduling unit comprises a combiner and shunt synchronous scheduling state machine, a scheduling pulse and frequency division clock generator, a time manager, a ping-pong buffer to ground and a ping-pong buffer to relay; wherein the content of the first and second substances,
the time manager receives a certain time signal and a certain frequency signal, generates satellite time according to the certain time signal and the certain frequency signal, and transmits the satellite time to the combiner and shunt synchronous scheduling state machine;
the scheduling pulse and frequency division clock generator outputs a frequency division clock and a scheduling pulse according to the rate switching instruction, transmits the frequency division clock and the scheduling pulse to the combiner and shunt synchronous scheduling state machine, and simultaneously transmits the frequency division clock and the scheduling pulse to the ground ping-pong buffer and the relay ping-pong buffer;
the combined path and shunt synchronous scheduling state machine determines scheduling time according to the scheduling pulse, and at the scheduling time, the combined path and shunt synchronous scheduling state machine puts satellite time into an insertion domain in a downlink data frame format; the combined path and shunt path synchronous scheduling state machine inquires whether data exists in a ground cache module or a relay cache module of the asynchronous scheduling unit at the corresponding scheduling time according to the type of the scheduling pulse; when no data exists, the combined path and shunt path synchronous scheduling state machine automatically generates an idle frame, and the currently generated idle frame is output to a ground ping-pong buffer or a relay ping-pong buffer according to the type of the current scheduling pulse; when data exist, the combining and shunting synchronous scheduling state machine carries the data of the ground cache module or the relay cache module to a corresponding ground ping-pong buffer or a relay ping-pong buffer;
performing ping-pong switching on the ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; reading downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock;
performing ping-pong switching on the relay ping-pong buffer according to the scheduling pulse, and switching the reading and writing relation of the ping-pong buffer when the ping-pong pulse arrives; and reading the downlink data in the ping-pong buffer according to the frequency division clock, converting the downlink data into serial data and outputting the serial data, wherein the downlink output data rate is determined by the frequency division clock.
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