A multi-mode telemetry and control system for communication satellites

Abstract

A multi-mode telemetry, tracking, and command (TT&C) system for a communication satellite includes a UCB transponder A receiving a first signal, a UCB transponder B receiving a second signal, and an S / C dual-mode digital transponder C-band RF module receiving a third signal. UCB transponder A outputs the first signal, UCB transponder B outputs the second signal, and when the S / C dual-mode transponder operates in UCB mode, the S / C dual-mode transponder C-band module outputs the third signal. The TT&C fixed-amplifier assembly includes multiple C-band TT&C fixed-amplifiers. The first, second, and third signals can be switched to the TT&C fixed-amplifiers in the C-band TT&C fixed-amplifier assembly via a first TT&C switch combination. The signals are amplified by the C-band TT&C fixed-amplifiers and then switched to the first or second downlink channel via a second TT&C switch combination. The S / C dual-mode digital transponder outputs an S-band signal, which is amplified and transmitted to the S-band downlink channel. This invention, by setting up a TT&C switch combination to be compatible with both UCB and S-band relay TT&C systems, makes the TT&C system simple and efficient.

Description

Technical Field

[0001] This invention relates to the field of communication satellite telemetry and control technology, and specifically to a multi-mode telemetry and control system for communication satellites. Background Technology

[0002] The communication satellite telemetry, tracking, and command (TT&C) subsystem provides a wireless transmission channel between the satellite and the ground station, provides the necessary TT&C channel for the satellite during its lifespan, and together with the integrated electronic subsystem, provides the necessary telemetry, remote control, and ranging functions for the satellite.

[0003] Currently, most domestic civilian and commercial communication satellites adopt the UCB unified carrier telemetry and control system, and are equipped with three UCB transponders. In addition, the system also includes telemetry and control antennas, filters, power dividers, power amplifiers, synthesizers and telemetry and control switches.

[0004] Currently, the launch process of geostationary orbit satellites mainly relies on the space-to-ground tracking and control (TT&C) link. The invisible arc during launch and the early orbit phase is relatively long, which is very detrimental to satellite TT&C safety and overall satellite security. However, by adding a relay TT&C link between the communication satellite and the relay satellite, the TT&C arc during launch and the early orbit phase can be greatly extended, reducing dependence on ground stations / ships during launch and improving the satellite's own safety and ability to cope with risks.

[0005] User satellites and relay satellites transmit telemetry, remote control, and ranging signals via an S-band spread spectrum link. Currently, the telemetry and control (TT&C) systems used on civilian and commercial communication satellites with relay TT&C capabilities are designed by adding a relay terminal to the existing UCB TT&C subsystem architecture to enable TT&C communication with the relay satellite. The main problems with this approach include:

[0006] The system architecture is complex, including not only three transponders in the UCB system, but also a relay terminal, which increases the system weight and power consumption.

[0007] The relay terminal is only turned on in the early stages of the active phase and transfer orbit phase, and is shut down for a long time in orbit. The single unit has a short working time, low utilization rate, and insufficient consideration of technical and economic integration. Summary of the Invention

[0008] This invention proposes a multi-mode telemetry and control system for communication satellites to solve the problem that existing satellites have complex systems that include three transponders (UCB) and relay equipment, and that the relay equipment is only activated in the early stages of the active phase and transfer orbit phase.

[0009] This invention proposes a multi-mode telemetry and control system for communication satellites, comprising an uplink section and a downlink section. The uplink section includes: a +Z omnidirectional remote control antenna A, a +Z omnidirectional remote control antenna B, a -Z omnidirectional remote control antenna, a receiver combiner A, a receiver combiner B, a receiver splitter filter, a receiver preselection filter, a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a +Z relay telemetry and control receiving antenna, and an S-band receiving filter.

[0010] Receiver combiner A receives the received signal from the +Z omnidirectional remote control antenna A and the received signal from the -Z omnidirectional remote control antenna. These two signals are combined and output to the receiver splitter filter. After being split by the receiver splitter filter, a first uplink signal and a third uplink signal are output. The first uplink signal is sent to the UCB transponder A, and the third uplink signal is sent to the C-band RF module of the S / C dual-mode digital transponder.

[0011] The receiver combiner B receives the received signal from the +Z omnidirectional remote control antenna B and the received signal from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver pre-selection filter. After the receiver pre-selection filter is processed, a second uplink signal is output. The second uplink signal is sent to the UCB transponder B.

[0012] The S-band receiving filter receives the +Z direction relay telemetry and control receiving antenna output signal, and after filtering by the S-band receiving filter, outputs a relay signal to the S-band RF module of the S / C dual-mode transponder.

[0013] During the transmit and early orbit phases, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band RF module receiver and transmitter of the S / C dual-mode transponder are turned on, and the C-band RF module receiver and transmitter of the S / C dual-mode transponder are turned off.

[0014] After the satellite is positioned, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band RF module receiver and transmitter of the S / C dual-mode transponder are turned off, and the C-band RF module receiver of the S / C dual-mode transponder is turned on and the transmitter is turned off.

[0015] The present invention also proposes a multi-mode telemetry and control system for communication satellites, which includes an uplink section and a downlink section. The downlink section includes: a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a first telemetry and control switch assembly, a telemetry and control fixed amplifier assembly, and a second telemetry and control switch assembly.

[0016] UCB transponder A outputs a first downlink signal to the first measurement and control switch combination, UCB transponder B outputs a second downlink signal to the first measurement and control switch combination, and when the S / C dual-mode transponder is operating in UCB mode, the S / C dual-mode transponder C-band module outputs a third downlink signal to the first measurement and control switch combination.

[0017] The measurement and control fixed amplifier assembly includes multiple measurement and control fixed amplifiers. The first downlink signal, the second downlink signal, and the third downlink signal are switched to the corresponding measurement and control fixed amplifier in the measurement and control fixed amplifier assembly by the first measurement and control switch assembly. After being processed by the corresponding measurement and control fixed amplifier, the signal is amplified and then switched to the first downlink channel or the second downlink channel by the second measurement and control switch assembly.

[0018] Preferably, the communication satellite multi-mode telemetry and control system further includes: when the S / C dual-mode transponder is operating under the S relay telemetry and control mode, the S-band module of the S / C dual-mode transponder outputs the relay telemetry and control downlink signal to the S-band relay telemetry and control fixed amplifier, which amplifies the signal and sends it to the S-band transmit filter for filtering. The filtered relay telemetry and control downlink signal is then sent to the +Z direction relay telemetry and control antenna for transmission.

[0019] Preferably, the measurement and control fixed amplifier assembly includes measurement and control fixed amplifier 1, measurement and control fixed amplifier 2, and measurement and control fixed amplifier 3;

[0020] The first measurement and control switch assembly includes measurement and control switch 1 and measurement and control switch 2 connected to each other;

[0021] The UCB transponder A is connected to the measurement and control switch 1, and the measurement and control switch 1 is connected to the input terminals of the measurement and control amplifier 1 and the measurement and control amplifier 2, respectively.

[0022] The UCB transponder B and the S / C dual-mode transponder are respectively connected to the measurement and control switch 2, and the measurement and control switch 2 is connected to the input terminal of the measurement and control fixed amplifier 3;

[0023] The second control switch assembly includes the interconnected control switch 3 and control switch 4.

[0024] The output terminals of the measurement and control amplifier 1 and the measurement and control amplifier 2 are connected to the measurement and control switch 3, and the measurement and control switch 3 is connected to the first downlink channel.

[0025] The output terminal of the measurement and control amplifier 3 is connected to the measurement and control switch 4, and the measurement and control switch 4 is connected to the second downlink channel.

[0026] Preferably, the first downlink signal and the third downlink signal are switched to the corresponding measurement and control amplifiers in measurement and control amplifier 1, measurement and control amplifier 2, and measurement and control amplifier 3 respectively via measurement and control switch 1 and measurement and control switch 2;

[0027] The second downlink signal and the third downlink signal are respectively switched to the corresponding measurement and control amplifiers in measurement and control amplifier 1, measurement and control amplifier 2, and measurement and control amplifier 3 for processing via measurement and control switch 1 and measurement and control switch 2;

[0028] After processing, the first downlink signal, the second downlink signal, and the third downlink signal are switched to the first downlink channel or the second downlink channel by the control switch 3 or the control switch 4.

[0029] Preferably, the first downlink channel includes: a C-band omnidirectional transmit filter A, a transmit power divider A, and a +Z-direction C-band telemetry antenna A. The amplified signal is filtered by the C-band omnidirectional transmit filter A and then sent to the transmit power divider A. After being divided by the transmit power divider A, the signal is sent to the +Z-direction C-band telemetry antenna A or the -Z-direction telemetry antenna for transmission.

[0030] The second downlink channel includes: a C-band omnidirectional transmission filter B, a transmission power divider B, and a +Z-direction C-band telemetry antenna 1B. The amplified signal is filtered by the C-band omnidirectional transmission filter B and then sent to the transmission power divider B. After being divided by the transmission power divider B, the signal is sent to the +Z-direction C-band telemetry antenna 1B or the -Z-direction telemetry antenna for transmission.

[0031] The Z-direction telemetry antenna is shared by either the first downlink channel or the second downlink channel.

[0032] Preferably, the communication satellite multi-mode telemetry and control system further includes: when the UCB transponder A transmitter malfunctions,

[0033] The UCB transponder A transmitter is powered off, while the UCB transponder B and the S / C dual-mode digital transponder C-band transmitter are powered on and operational.

[0034] The second downlink signal and the third downlink signal are respectively switched by the first measurement and control switch combination to the measurement and control fixed amplifier in the measurement and control power amplifier combination for processing.

[0035] Preferably, the communication satellite multi-mode telemetry and control system further includes: when the UCB transponder B transmitter malfunctions,

[0036] The UCB transponder B transmitter is powered off, while the UCB transponder A and the S / C dual-mode digital transponder C-band transmitter are powered on and operational.

[0037] The first downlink signal and the third downlink signal are respectively switched by the first measurement and control switch combination to the measurement and control fixed amplifier in the measurement and control power amplifier combination.

[0038] Preferably, the communication satellite multi-mode telemetry and control system further includes:

[0039] Before the satellite is positioned in the launch phase and in the orbit phase, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band module receiver and transmitter of the S / C dual-mode transponder are turned on, and the C-band radio frequency module receiver and transmitter of the S / C dual-mode transponder are turned off.

[0040] After the satellite is positioned, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band RF module receiver and transmitter of the S / C dual-mode transponder are turned off, and the C-band module receiver of the S / C dual-mode transponder is turned on and the transmitter is turned off.

[0041] This invention also proposes a multi-mode telemetry and control system for communication satellites, comprising an uplink section and a downlink section. The uplink section includes: a +Z omnidirectional remote control antenna A, a +Z omnidirectional remote control antenna B, a -Z omnidirectional remote control antenna, a receiver combiner A, a receiver combiner B, a receiver splitter filter, a receiver preselection filter, a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a +Z relay telemetry and control receiving antenna, and an S-band receiving filter. The downlink section includes: a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a first telemetry and control switch assembly, a telemetry and control fixed amplifier assembly, and a second telemetry and control switch assembly.

[0042] Receiver combiner A receives the received signal from the +Z omnidirectional remote control antenna A and the received signal from the -Z omnidirectional remote control antenna. These two signals are combined and output to the receiver splitter filter. After being split by the receiver splitter filter, a first uplink signal and a third uplink signal are output. The first uplink signal is sent to the UCB transponder A, and the third uplink signal is sent to the C-band RF module of the S / C dual-mode digital transponder.

[0043] The receiver combiner B receives the received signal from the +Z omnidirectional remote control antenna B and the received signal from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver pre-selection filter. After the receiver pre-selection filter is processed, a second uplink signal is output. The second uplink signal is sent to the UCB transponder B.

[0044] The S-band receiving filter receives the +Z direction relay telemetry and control receiving antenna output signal, and after filtering by the S-band receiving filter, outputs a relay signal to the S-band RF module of the S / C dual-mode transponder.

[0045] The UCB transponder A outputs a first downlink signal to the first measurement and control switch assembly, the UCB transponder B outputs a second downlink signal to the first measurement and control switch assembly, and when the S / C dual-mode transponder is operating in UCB mode, the S / C dual-mode transponder C-band module outputs a third downlink signal to the first measurement and control switch assembly.

[0046] The measurement and control fixed amplifier assembly includes multiple measurement and control fixed amplifiers. The first downlink signal, the second downlink signal, and the third downlink signal are switched to the corresponding measurement and control fixed amplifier in the measurement and control fixed amplifier assembly by the first measurement and control switch assembly. The signals are amplified by the corresponding measurement and control fixed amplifiers and then switched to the first downlink channel or the second downlink channel by the second measurement and control switch assembly.

[0047] The advantages of this invention compared to existing technologies are as follows: This invention ensures both the original UCB telemetry and control functions and is compatible with relay telemetry and control functions, thus improving the efficiency of relay terminal utilization. This invention achieves S-band relay and UCB dual-mode telemetry and control within a single dual-mode digital transponder, reducing the need for a single relay terminal compared to existing telemetry and control systems with compatible relay functions, thereby reducing the load weight. Without affecting the functionality of the telemetry and control system, it improves the utilization efficiency of the telemetry and control equipment, resulting in a simpler and more efficient system architecture. Attached Figure Description

[0048] Figure 1 This is a block diagram illustrating the design principle of the satellite dual-mode telemetry and control subsystem of this invention. Detailed Implementation

[0049] The specific embodiments of the present invention will be described in detail below.

[0050] This invention proposes a multi-mode telemetry and control system for communication satellites, comprising an uplink section and a downlink section. The uplink section includes: a +Z omnidirectional remote control antenna A, a +Z omnidirectional remote control antenna B, a -Z omnidirectional remote control antenna, a receiver combiner A, a receiver combiner B, a receiver splitter filter, a receiver preselection filter, a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a +Z relay telemetry and control receiving antenna, and an S-band receiving filter. The downlink section includes: a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a first telemetry and control switch assembly, a telemetry and control fixed amplifier assembly, and a second telemetry and control switch assembly.

[0051] UCB transponder A outputs a first signal S5 via a first control switch combination, and UCB transponder B outputs a second signal S6 via a first control switch combination. When the S / C dual-mode transponder is operating in UCB mode, the S / C dual-mode transponder C-band module outputs a third signal S7 via a first control switch combination.

[0052] In this configuration, the downlink signals S5, S6, and S7 can correspond to the uplink signals S1, S2, and S3, respectively; alternatively, they may not correspond to each other. As a non-exhaustive example, the downlink signals S5, S6, and S7 can also be independently generated telemetry signals or other types of signals on the satellite. Similarly, the uplink signals S1, S2, and S3 can be independent remote control signals or other signals received by the satellite antenna.

[0053] The telemetry and control (TT&C) fixed-line amplifier assembly includes multiple TT&C fixed-line amplifiers for amplifying C-band signals. The first signal S5, the second signal S6, and the third signal S7 are switched to the TT&C fixed-line amplifier in the assembly via a first TT&C switch group. The amplified signal is then processed by the TT&C fixed-line amplifier and switched to either the first downlink channel or the second downlink channel via a second TT&C switch group. The first downlink channel includes: a C-band omnidirectional transmit filter A, a transmit power divider A, and a +Z-direction C-band TT&C antenna A. The second downlink channel includes: a C-band omnidirectional transmit filter B, a transmit power divider B, and a +Z-direction C-band TT&C antenna B.

[0054] In one embodiment, the telemetry and control (TT&C) fixed amplifier assembly includes TT&C fixed amplifier 1, TT&C fixed amplifier 2, and TT&C fixed amplifier 3. The first TT&C switch assembly includes TT&C switch 1 and TT&C switch 2 connected to each other. UCB transponder A is connected to TT&C switch 1, and TT&C switch 1 is connected to the input terminals of TT&C fixed amplifier 1 and TT&C fixed amplifier 2, respectively. UCB transponder B and the S / C dual-mode transponder are connected to TT&C switch 2, and TT&C switch 2 is connected to the input terminal of TT&C fixed amplifier 3.

[0055] The second measurement and control switch assembly includes the interconnected measurement and control switch 3 and measurement and control switch 4. The output terminals of measurement and control amplifier 1 and measurement and control amplifier 2 are connected to measurement and control switch 3, which is connected to the first downlink channel. The output terminal of measurement and control amplifier 3 is connected to measurement and control switch 4, which is connected to the second downlink channel.

[0056] The first downlink channel includes: a C-band omnidirectional transmit filter A, a transmit power divider A, and a +Z-direction C-band telemetry and control antenna A. The second downlink channel includes: a C-band omnidirectional transmit filter B, a transmit power divider B, and a +Z-direction C-band telemetry and control antenna 1B. Additionally, it includes a -Z-direction telemetry antenna 2 shared by either the first or second downlink channel.

[0057] In one embodiment, the communication satellite multi-mode telemetry and control system of the present invention specifically includes: +Z omnidirectional remote control antenna 1A, +Z omnidirectional remote control antenna B, -Z omnidirectional remote control antenna 2, receiver combiner A, receiver combiner B, receiver splitter filter, receiver preselection filter, UCB transponder A, UCB transponder B, S / C dual-mode transponder, telemetry and control switch 1, telemetry and control switch 2, telemetry and control switch 3, telemetry and control switch 4, telemetry and control switch 5, telemetry and control switch 6, telemetry and control fixed amplifier 1, telemetry and control fixed amplifier 2, telemetry and control fixed amplifier 3, C-band omnidirectional transmission filter A, C-band omnidirectional transmission filter B, transmission power divider A, transmission power divider B, load 1, load 2, +Z omnidirectional telemetry antenna A, +Z omnidirectional telemetry antenna B, -Z omnidirectional telemetry antenna, and +Z relay telemetry and control transmission antenna.

[0058] This invention relates to a multi-mode telemetry and control system for communication satellites, which includes UCB transponder A, UCB transponder B, and an S / C dual-mode transponder. A telemetry and control switch is used to switch between the remote control uplink and telemetry downlink channels, enabling remote control and telemetry in an S / C dual-band system. This allows for channel switching in case of failure and also saves on the weight and power consumption of the telemetry and control subsystem equipment.

[0059] The S / C dual-mode transponder integrates an S-band radio frequency module and a C-band radio frequency module, both sharing the same baseband processing module. This dual-mode transponder can be switched between S-band relay telemetry and control mode and UCB (Unified Baseline Control) system traditional telemetry and control mode via commands. During the satellite's active phase and transfer orbit phase, the dual-mode transponder operates in S-band relay telemetry and control mode; after the satellite reaches its designated orbit, it operates in UCB telemetry and control mode.

[0060] Specifically, receiver synthesizer A receives the signal output from the +Z omnidirectional remote control antenna A and the signal output from the -Z omnidirectional remote control antenna. These two signals are combined and then output to the receiver splitter filter. After being split by the receiver splitter filter, the first signal S1 and the third signal S3 are output. The first signal S1 is sent to the UCB transponder A, and the third signal S3 is sent to the C-band RF module of the S / C dual-mode digital transponder.

[0061] The receiver synthesizer B receives the signal output from the +Z omnidirectional remote control antenna B and the signal output from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver pre-selection filter. After the receiver pre-selection filter is processed, a second signal is output. The second signal S2 is sent to the UCB transponder B.

[0062] The S-band receiving filter receives the output signal from the +Z direction relay telemetry and control receiving antenna. After filtering by the S-band receiving filter, the relay signal S4 is output and sent to the S-band RF module of the S / C dual-mode transponder.

[0063] UCB transponder A outputs a first signal S5 to measurement and control amplifier 1 via measurement and control switch 1. Measurement and control amplifier 1 amplifies the first signal S5 and then sends it to C-band omnidirectional transmission filter A via measurement and control switch 3. After being filtered by C-band omnidirectional transmission filter A, it is sent to transmitter power divider A, and after being divided by transmitter power divider A, it is sent to +Z-direction C-band measurement and control antenna A or -Z-direction telemetry antenna for transmission. Further, transmitter power divider A outputs a first signal to -Z-direction telemetry antenna via measurement and control switch 5 for transmission, wherein one end of measurement and control switch 5 is also connected to load 1.

[0064] UCB transponder B outputs a second signal S6 to the telemetry amplifier 3 via telemetry switch 2. The telemetry amplifier 3 amplifies the second signal S6 and then sends it to the C-band omnidirectional transmission filter B via telemetry switch 4. After being filtered by the C-band omnidirectional transmission filter B, it is sent to the transmitter power divider B, and after being divided by the transmitter power divider B, it is sent to the +Z-direction C-band telemetry antenna B or the -Z-direction telemetry antenna for transmission. Further, the transmitter power divider B outputs a second signal to the -Z-direction telemetry antenna via telemetry switch 6 for transmission, wherein one end of the telemetry switch 6 is connected to the load 2.

[0065] The C-band module of the S / C dual-mode transponder outputs a third signal S7 to the measurement and control amplifier 2; wherein, the third signal S7 output by the S / C dual-mode transponder is sent to the measurement and control amplifier 2 via the measurement and control switch 2 and the measurement and control switch 1 in sequence; the output signal of the measurement and control amplifier 2 is sent to the measurement and control switch 4 via the measurement and control switch 3.

[0066] The control switches 1-6 can switch the path of the control signal, and they have the same structure. Each control switch has four interfaces: J1, J2, J3, and J4. The control switches can connect two of the four interfaces to switch the signal path.

[0067] The S / C dual-mode transponder's S-band module outputs a relay telemetry and control downlink signal S8 to the S-band relay telemetry and control fixed amplifier. The S-band relay telemetry and control fixed amplifier amplifies the signal and sends it to the S-band transmit filter for filtering. The filtered relay telemetry and control downlink signal S8 is then sent to the +Z direction relay telemetry and control antenna for transmission.

[0068] In a specific embodiment one of the present invention, combined with Figure 1 This implementation method is described below.

[0069] For the telemetry and control uplink path, receiver combiner A receives the output signals from the +Z omnidirectional remote control antenna A and the -Z omnidirectional remote control antenna. After power combining, the signals are output to the receiver splitter filter. Then, after splitting and power dividing, one path S1 is sent to the UCB transponder A, and the other path S3 is sent to the C-band RF module of the S / C dual-mode digital transponder. Receiver combiner B receives the output signals from the +Z omnidirectional remote control antenna B and the -Z omnidirectional remote control antenna. After power combining, the signals are output to the receiver preselection filter. Then, signal S2 is filtered and sent to the UCB transponder B. The S-band receiver filter receives the output signal from the +Z relay telemetry and control receiving antenna. After filtering, the forward signal S4 is output to the S-band RF module of the S / C dual-mode transponder.

[0070] For the downlink path of telemetry and control, UCB transponders A and B output downlink signals S5 and S6 respectively, which are connected to telemetry and control switches 1 and 2. The C-band module of the S / C dual-mode transponder outputs a third UCB downlink signal S7, which is connected to telemetry and control switch 2. C-band telemetry and control fixed amplifiers 1, 2, and 3 are connected via telemetry and control switches 1 to 4 for loop backup. One fixed amplifier output signal is filtered by the C-band omnidirectional transmission filter A and then divided by the transmission power divider A before being sent to the +Z-direction C-band telemetry and control antenna 1A or the -Z-direction telemetry antenna 2 for transmission. The other fixed amplifier output signal is filtered by the C-band omnidirectional transmission filter B and then divided by the transmission power divider B before being sent to the +Z-direction C-band telemetry and control antenna B or the -Z-direction telemetry antenna for transmission. The S-band module of the S / C dual-mode transponder outputs a relay telemetry and control downlink signal S8 to the S-band fixed amplifier. The fixed amplifier outputs a return signal to the S-band transmission filter, which is then filtered and sent to the +Z-direction relay telemetry and control antenna for transmission.

[0071] In the second specific embodiment of the present invention: UCB transponders A and B, and S / C dual-mode transponder C band module use three different uplink and downlink frequencies respectively, and operate in frequency division multiplexing mode.

[0072] The operating modes of the measurement and control system at different times are specified in the table below:

[0073]

[0074] Before the launch phase and satellite enter orbit phase begin normal operation, both UCB transponders A and B are powered on and in hot standby mode, the S / C dual-mode digital transponder operates in relay S spread spectrum mode, and the C-band radio frequency module is powered off.

[0075] During normal operation in orbit, UCB transponders A and B are always powered on and in hot standby mode. The S-band RF module of the S / C dual-mode digital transponder is powered off, and the C-band module of the S / C dual-mode transponder serves as a cold backup for UCB transponder A. The transmitter is powered off, and the receiver is powered on. Figure 1 The diagram shows the default switch connection method when the system is powered on. Measurement and control fixed amplifiers 1 and 3 are powered on and operational.

[0076] In a specific embodiment three of the present invention, the channel switching method after an on-orbit transponder malfunction is specified as follows:

[0077] (1) If the transmitter of UCB transponder A malfunctions, UCB transponder B continues to operate, activating the S / C dual-mode digital transponder. The channel switching method is as follows: First, a command is sent to shut down the malfunctioning transmitter of UCB transponder A. Then, a command is sent to turn on the C-band transmitter of the S / C dual-mode digital transponder, switching signal S7 to the telemetry and control amplifier 2. A command is then sent to switch telemetry and control switch 3 to connect J2-J4 / J1-J3, causing telemetry and control amplifier 2 to connect to the omnidirectional transmission filter A and output signal S7. At this time, UCB transponder B and the S / C dual-mode transponder are operating in orbit, and telemetry and control amplifiers 2 and 3 are powered on.

[0078] At this time, the UCB transponder B outputs the second signal S6 to the measurement and control amplifier 3 via the measurement and control switch 2. The measurement and control amplifier 3 amplifies the second signal S6 and then sends it to the C-band omnidirectional transmission filter B via the measurement and control switch 4. After being filtered by the C-band omnidirectional transmission filter B, it is sent to the transmission power divider B. After being divided by the transmission power divider B, it is sent to the +Z-direction C-band measurement and control antenna B and / or the -Z-direction telemetry antenna for transmission.

[0079] The C-band module of the S / C dual-mode transponder outputs a third signal S7 to the telemetry and control amplifier 2 via the telemetry and control switch 2 (J1-J4 / J2-J3 connected). The third signal S7 is amplified by the telemetry and control amplifier 2 and then switched to the omnidirectional C-band transmit filter A via the telemetry and control switch 3. After being filtered by the omnidirectional C-band transmit filter A, it is sent to the transmit power divider A. After being divided by the transmit power divider A, it is sent to the +Z-direction C-band telemetry and control antenna A and / or the -Z-direction telemetry antenna for transmission.

[0080] (2) If the transmitter of UCB transponder B malfunctions, but UCB transponder A continues to operate, the S / C dual-mode digital transponder is activated. First, a command is sent to shut down the malfunctioning transmitter of UCB transponder B. Then, a command is sent to turn on the C-band transmitter of the S / C dual-mode digital transponder. A command is sent to switch control switch 2 to connect J1-J3 / J2-J4, connecting the S / C dual-mode transponder to control amplifier 3. At this time, UCB transponder A and the S / C dual-mode transponder are operating in orbit, and control amplifiers 1 and 3 are powered on.

[0081] At this time, the UCB transponder A outputs the first signal S5 to the measurement and control amplifier 1 via the measurement and control switch 1. The measurement and control amplifier 1 amplifies the first signal S5 and then sends it to the C-band omnidirectional transmission filter A via the measurement and control switch 3. After being filtered by the C-band omnidirectional transmission filter A, it is sent to the transmitting power divider A. After being divided by the transmitting power divider A, it is sent to the +Z-direction C-band measurement and control antenna A or the -Z-direction telemetry antenna for transmission.

[0082] The C-band module of the S / C dual-mode transponder outputs the third signal S7 to the measurement and control amplifier 3 via the measurement and control switch 4 (J1-J3 / J2-J4 are connected). The measurement and control amplifier 3 amplifies the third signal S7 and then sends it to the C-band omnidirectional transmission filter B via the measurement and control switch 4. After being filtered by the C-band omnidirectional transmission filter B, it is sent to the transmission power divider B. After being divided by the transmission power divider B, it is sent to the +Z-direction C-band measurement and control antenna B or the -Z-direction telemetry antenna for transmission.

Claims

1. A multi-mode telemetry and control system for communication satellites, comprising an uplink section and a downlink section, characterized in that, The uplink section includes: a +Z omnidirectional remote control antenna A, a +Z omnidirectional remote control antenna B, a -Z omnidirectional remote control antenna, a receiver combiner A, a receiver combiner B, a receiver splitter filter, a receiver preselection filter, a UCB transponder A, a UCB transponder B, an S / C dual-mode transponder, a +Z relay telemetry and control receiving antenna, and an S-band receiving filter; wherein... The receiver synthesizer A receives the received signal from the +Z omnidirectional remote control antenna A and the received signal from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver splitter filter. After splitting by the receiver splitter filter, the first uplink signal and the third uplink signal are output. The first uplink signal (S1) is sent to the UCB transponder A, and the third uplink signal (S3) is sent to the C-band RF module of the S / C dual-mode digital transponder. The receiver synthesizer B receives the received signal from the +Z omnidirectional remote control antenna B and the received signal from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver pre-selection filter. After the receiver pre-selection filter is processed, the second uplink signal is output. The second uplink signal (S2) is sent to the UCB transponder B. The S-band receiving filter receives the +Z direction relay telemetry and control receiving antenna output signal, and after filtering by the S-band receiving filter, outputs the relay signal (S4) to the S-band RF module of the S / C dual-mode transponder. During the transmit and early orbit phases, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band RF module receiver and transmitter of the S / C dual-mode transponder are turned on, and the C-band RF module receiver and transmitter of the S / C dual-mode transponder are turned off. After the satellite is positioned, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band RF module receiver and transmitter of the S / C dual-mode transponder are turned off, and the C-band RF module receiver of the S / C dual-mode transponder is turned on and the transmitter is turned off.

2. A multi-mode telemetry and control system for communication satellites, comprising an uplink section and a downlink section, characterized in that, The downlink section includes: UCB transponder A, UCB transponder B, S / C dual-mode transponder, first measurement and control switch assembly, measurement and control fixed amplifier assembly, and second measurement and control switch assembly; UCB transponder A outputs a first downlink signal to the first measurement and control switch combination (S5), UCB transponder B outputs a second downlink signal to the first measurement and control switch combination (S6), and when the S / C dual-mode transponder is operating in UCB mode, the S / C dual-mode transponder C-band module outputs a third downlink signal to the first measurement and control switch combination (S7). The measurement and control fixed amplifier assembly includes multiple measurement and control fixed amplifiers. The first downlink signal (S5), the second downlink signal (S6), and the third downlink signal (S7) are switched to the corresponding measurement and control fixed amplifiers in the measurement and control fixed amplifier assembly via the first measurement and control switch assembly. The signals are processed by the corresponding measurement and control fixed amplifiers to obtain amplified signals, and then switched to the first downlink channel or the second downlink channel via the second measurement and control switch assembly.

3. The communication satellite multi-mode telemetry and control system according to claim 2, characterized in that, Further includes: When the S / C dual-mode transponder operates under the S relay telemetry and control system, the S-band module of the S / C dual-mode transponder outputs the relay telemetry and control downlink signal (S8) to the S-band relay telemetry and control fixed amplifier. After being amplified by the S-band relay telemetry and control fixed amplifier, it is sent to the S-band transmit filter for filtering. The filtered relay telemetry and control downlink signal (S8) is then sent to the +Z direction relay telemetry and control antenna for transmission.

4. The communication satellite multi-mode telemetry and control system according to claim 2 or 3, characterized in that, The measurement and control fixed amplifier assembly includes measurement and control fixed amplifier 1, measurement and control fixed amplifier 2, and measurement and control fixed amplifier 3; The first measurement and control switch assembly includes measurement and control switch 1 and measurement and control switch 2 connected to each other; The UCB transponder A is connected to the measurement and control switch 1, and the measurement and control switch 1 is connected to the input terminals of the measurement and control amplifier 1 and the measurement and control amplifier 2, respectively. The UCB transponder B and the S / C dual-mode transponder are respectively connected to the measurement and control switch 2, and the measurement and control switch 2 is connected to the input terminal of the measurement and control fixed amplifier 3; The second control switch assembly includes the interconnected control switch 3 and control switch 4. The output terminals of the measurement and control amplifier 1 and the measurement and control amplifier 2 are connected to the measurement and control switch 3, and the measurement and control switch 3 is connected to the first downlink channel. The output terminal of the measurement and control amplifier 3 is connected to the measurement and control switch 4, and the measurement and control switch 4 is connected to the second downlink channel.

5. The communication satellite multi-mode telemetry and control system according to claim 4, characterized in that, The first downlink signal (S5) and the third downlink signal (S7) are switched to the corresponding measurement and control amplifiers in measurement and control amplifier 1, measurement and control amplifier 2, and measurement and control amplifier 3 respectively through measurement and control switch 1 and measurement and control switch 2; The second downlink signal (S6) and the third downlink signal (S7) are switched to the corresponding measurement and control amplifiers in measurement and control amplifier 1, measurement and control amplifier 2, and measurement and control amplifier 3 respectively for processing via measurement and control switch 1 and measurement and control switch 2; After processing, the first downlink signal (S5), the second downlink signal (S6), and the third downlink signal (S7) are switched to the first downlink channel or the second downlink channel via control switch 3 or control switch 4.

6. The communication satellite multi-mode telemetry and control system according to claim 2 or 3, characterized in that, The first downlink channel includes: a C-band omnidirectional transmit filter A, a transmit power divider A, and a +Z-direction C-band telemetry antenna A. The amplified signal is filtered by the C-band omnidirectional transmit filter A and then sent to the transmit power divider A. After being divided by the transmit power divider A, the signal is sent to the +Z-direction C-band telemetry antenna A or the -Z-direction telemetry antenna for transmission. The second downlink channel includes: a C-band omnidirectional transmission filter B, a transmission power divider B, and a +Z-direction C-band telemetry antenna 1B. The amplified signal is filtered by the C-band omnidirectional transmission filter B and then sent to the transmission power divider B. After being divided by the transmission power divider B, the signal is sent to the +Z-direction C-band telemetry antenna 1B or the -Z-direction telemetry antenna for transmission. The Z-direction telemetry antenna is shared by either the first downlink channel or the second downlink channel.

7. The communication satellite multi-mode telemetry and control system according to claim 2, characterized in that, Further includes: When the transmitter of UCB transponder A malfunctions The UCB transponder A transmitter is powered off, while the UCB transponder B and the S / C dual-mode digital transponder C-band transmitter are powered on and operational. The second downlink signal (S6) and the third downlink signal (S7) are respectively switched by the first measurement and control switch combination to the measurement and control fixed amplifier in the measurement and control power amplifier combination for processing.

8. The communication satellite multi-mode telemetry and control system according to claim 2, characterized in that, Further includes: When the UCB transponder B transmitter malfunctions The UCB transponder B transmitter is powered off, while the UCB transponder A and the S / C dual-mode digital transponder C-band transmitter are powered on and operational. The first downlink signal (S5) and the third downlink signal (S7) are switched by the first measurement and control switch combination to the measurement and control fixed amplifier in the measurement and control power amplifier combination.

9. The communication satellite multi-mode telemetry and control system according to claim 2, characterized in that, Further includes: Before the satellite is positioned in the launch phase and in the orbit phase, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band module receiver and transmitter of the S / C dual-mode transponder are turned on, and the C-band radio frequency module receiver and transmitter of the S / C dual-mode transponder are turned off. After the satellite is positioned, the receiver and transmitter of UCB transponder A are turned on, the receiver and transmitter of UCB transponder B are turned on, the S-band RF module receiver and transmitter of the S / C dual-mode transponder are turned off, and the C-band module receiver of the S / C dual-mode transponder is turned on and the transmitter is turned off.

10. A multi-mode telemetry and control system for communication satellites, comprising an uplink section and a downlink section, characterized in that, The uplink section includes: +Z omnidirectional remote control antenna A, +Z omnidirectional remote control antenna B, -Z omnidirectional remote control antenna, receiver combiner A, receiver combiner B, receiver splitter filter, receiver preselection filter, UCB transponder A, UCB transponder B, S / C dual-mode transponder, +Z relay telemetry and control receiving antenna, and S-band receiving filter; the downlink section includes: UCB transponder A, UCB transponder B, S / C dual-mode transponder, first telemetry and control switch assembly, telemetry and control fixed amplifier assembly, and second telemetry and control switch assembly. The receiver synthesizer A receives the received signal from the +Z omnidirectional remote control antenna A and the received signal from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver splitter filter. After splitting by the receiver splitter filter, the first uplink signal and the third uplink signal are output. The first uplink signal (S1) is sent to the UCB transponder A, and the third uplink signal (S3) is sent to the C-band RF module of the S / C dual-mode digital transponder. The receiver synthesizer B receives the received signal from the +Z omnidirectional remote control antenna B and the received signal from the -Z omnidirectional remote control antenna. After power combining, these two signals are output to the receiver pre-selection filter. After the receiver pre-selection filter is processed, the second uplink signal is output. The second uplink signal (S2) is sent to the UCB transponder B. The S-band receiving filter receives the +Z direction relay telemetry and control receiving antenna output signal, and after filtering by the S-band receiving filter, outputs the relay signal (S4) to the S-band RF module of the S / C dual-mode transponder. The UCB transponder A outputs a first downlink signal to the first measurement and control switch assembly (S5), the UCB transponder B outputs a second downlink signal to the first measurement and control switch assembly (S6), and when the S / C dual-mode transponder is operating in UCB mode, the S / C dual-mode transponder C-band module outputs a third downlink signal to the first measurement and control switch assembly (S7). The measurement and control fixed amplifier assembly includes multiple measurement and control fixed amplifiers. The first downlink signal (S5), the second downlink signal (S6), and the third downlink signal (S7) are switched to the corresponding measurement and control fixed amplifiers in the measurement and control fixed amplifier assembly via the first measurement and control switch assembly. The signals are amplified by the corresponding measurement and control fixed amplifiers and then switched to the first downlink channel or the second downlink channel via the second measurement and control switch assembly.

Images