Satellite radio frequency switch position judgment method under in-orbit telemetering-free condition

Abstract

The invention discloses a satellite radio frequency switch position judgment method under an in-orbit telemetering-free condition, and the method comprises the steps: selecting a transponder channel for testing under the condition that a radio frequency switch is located at a to-be-tested position; limiting a telemetering normal value range during testing; combing instructions and telemetering codes required by testing; adjusting the positions of other radio frequency switches, and communicating the radio frequency switch to be tested with the transponder channel; setting a transponder squelch state, and recording a test spectrum; setting a transponder gain gear, and recording a test frequency spectrum; and comparing the frequency spectrum data, and judging the on-off state of the to-be-tested position of the radio frequency switch. The problem that the switch position cannot be judged after the satellite radio frequency switch telemetering function breaks down in orbit is solved, and the operation requirements of payload adjustment tasks such as single-machine switching and beam switching in a transponder channel for radio frequency switch rotation are met while the safety of each single machine of the satellite payload is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of on-orbit management of spacecraft, and in particular relates to a method for determining the position of a satellite radio frequency switch under on-orbit non-telemetry conditions. Background Art

[0002] With the rapid development of the satellite industry, especially high-throughput satellites, the number of RF switches used on satellites is increasing. RF switches mainly use reed switches as sensors for switch position, and the collected results are transmitted via telemetry. Once a telemetry sensor such as a reed switch or a telemetry transmission link fails, the position of the RF switch cannot be directly measured by telemetry, and there is currently no other auxiliary method to indirectly determine it. In this case, when performing payload adjustment tasks such as single-machine switching and beam switching in the transponder channel, it is necessary to avoid the RF switch, which may result in the ineffective use of precious transponder, frequency or beam resources on the satellite, and at the same time cause the payload adjustment task to take a significant increase in time, reducing the satellite's operating efficiency and user experience. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art and provide a method for determining the position of a satellite radio frequency switch under on-orbit non-telemetry conditions, thereby solving the problem that the position of the radio frequency switch cannot be determined due to abnormal radio frequency switch telemetry.

[0004] The technical solution of the present invention is: a method for determining the position of a satellite radio frequency switch under the condition of no telemetry on orbit, comprising the following steps:

[0005] S1: When the RF switch is in the position to be tested, select the transponder channel to be used for the test;

[0006] S2: Limit the normal value range of telemetry of the selected test repeater during the test process, so that the actual telemetry of the repeater during the test process does not exceed the normal value range of telemetry;

[0007] S3: Start the test, adjust the positions of all other RF switches in the selected test repeater channel except the RF switch to be tested, and connect the RF switch to be tested and the selected repeater channel;

[0008] S4: Set the repeater squelch state;

[0009] S5: With the transponder squelch closed, set the transponder gain gear from low to high, and record the spectrum after each gear adjustment;

[0010] S6: Compare the spectrum data to determine the on / off state of the RF switch at the position to be tested.

[0011] Further, when comparing the spectrum data in step S6, in the case where there is an uplink signal in the selected test repeater channel, if a signal consistent with the waveform characteristics of the uplink signal can be gradually observed in the spectrum recorded at different gears from low to high obtained in step S5, and the signal level gradually increases, then the RF switch position to be tested is on, otherwise the RF switch position to be tested is off;

[0012] When comparing the spectrum data in step S6, when there is no uplink signal in the selected test repeater channel, if the noise spectrum can be gradually observed in the spectrum recorded at different gears from low to high obtained in step S5, and the waveform characteristics of the noise spectrum are consistent with the noise spectrum recorded during the test of the repeater channel on the ground during the satellite development stage, and the signal level gradually increases, then the RF switch position to be tested is on, otherwise the RF switch position to be tested is off.

[0013] Further, in step S1, if there are multiple positions to be tested for the RF switch, a repeater channel to be used for the test is selected for each position to be tested, and then S2 to S6 are executed to test them one by one;

[0014] Spectrum monitoring equipment is set up in advance within the downlink coverage area of ​​the repeater channel selected for the test.

[0015] Further, in step S2, the telemetry normal value range is the telemetry parameter characteristics of the selected transponder under normal startup conditions, and the telemetry parameters include the spiral current, the anode voltage and the bus current;

[0016] The normal value range of telemetry is: the spiral current value is maintained at 0-1 mA, the anode voltage value is maintained within 50 volts above or below the operating voltage, and the bus current is maintained at 0-3 amperes;

[0017] If the actual telemetry of the repeater exceeds the normal telemetry value range during the test, the repeater should be shut down immediately.

[0018] Furthermore, after step S2 and before step S3, the instructions and telemetry codes required for the test are sorted out and used directly during the test.

[0019] Further, the instructions include: RF switch rotation instructions, transponder power-on instructions, transponder power-off instructions, transponder gain level setting instructions, and transponder squelch state setting instructions;

[0020] The telemetry codes include: RF switch position telemetry, transponder on / off status telemetry, transponder gain gear telemetry, and transponder squelch status telemetry.

[0021] Furthermore, when the repeater squelch state is set in step S4, the repeater should be turned on and preheated. The repeater states set in step S4 are squelch-on state and squelch-off state, respectively.

[0022] Furthermore, when setting the gain gear of the repeater in step S5, a fixed gain mode is used, and the gain is gradually adjusted from zero gear to the designed working gear and then to the highest gear, from low to high, and the adjustment step does not exceed 1 / 4 of the working gear; when recording the spectrum in step S5, the spectrum range should cover the entire frequency band of the repeater channel.

[0023] Furthermore, the designed operating position of the transponder should be the position determined during the initial in-orbit test of the satellite launch, or the position determined according to user requirements during long-term in-orbit use.

[0024] The advantages of the present invention are as follows: the present invention solves the problem that the switch position cannot be determined after a satellite radio frequency switch telemetry function fails in orbit, and while ensuring the safety of each unit of the satellite payload, it meets the operational requirements for the rotation of the radio frequency switch for payload adjustment tasks such as unit switching and beam switching in the transponder channel.

[0025] (1) The present invention can determine the switch position without remote measurement of the RF switch by monitoring the output spectrum characteristics of the repeater;

[0026] (2) The present invention operates the satellite payload under normal operating conditions within the range allowed by the satellite design, and clarifies the satellite telemetry parameters that need to be monitored and their normal value ranges, which can ensure the safety of each unit of the satellite payload during the test;

[0027] (3) The present invention is applicable to all radio frequency switches in satellite transponder channel links. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a flowchart of the steps of a method for determining the position of a satellite radio frequency switch in orbit without telemetry in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the objectives, technical steps and advantages of the present invention more clear, the implementation methods of the method disclosed in the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] like Figure 1 The present invention proposes a method for determining the position of a satellite radio frequency switch under the condition of no telemetry on orbit, comprising:

[0031] Step 1: When the RF switch is in the position to be tested, select the transponder channel to be used for the test.

[0032] In this embodiment, it is necessary to select a repeater channel that can be connected to the RF switch at the position to be tested, to ensure that the test path can test the position point of the RF switch telemetry fault.

[0033] Step 2: Limit the normal range of telemetry values ​​during testing.

[0034] In this embodiment, the range of change of parameters such as the transponder spiral current, positive voltage, bus current, etc. during the test is limited in advance according to the use characteristics of the transponder channel;

[0035] The normal range of telemetry values ​​is determined based on the test data of the single transponder on the ground during the satellite development phase. The typical values ​​are: the spiral current value should be maintained at 0-1 milliampere, the anode voltage value should be maintained within 50 volts above or below the operating voltage, and the bus current should be maintained at 0-3 amperes;

[0036] If an over-limit phenomenon occurs during the test, the transponder must be turned off immediately and wait for the tester's decision before performing other operations.

[0037] Step 3: Sort out the instructions and telemetry codes required for testing.

[0038] In this embodiment, all position adjustment instructions of the RF switch to be tested, all position adjustment instructions of all RF switches in the selected repeater channel, repeater power on and off instructions, repeater squelch state setting instructions, repeater gain level setting instructions and corresponding telemetry point codes are prepared for direct use during testing.

[0039] Step 4: Adjust the positions of other RF switches to connect the RF switch to be tested to the repeater channel.

[0040] In this embodiment, when the telemetry cannot be confirmed, the RF switch to be tested is directly commanded to be set to the position to be tested, and other RF switches with normal telemetry adjust their positions according to the normal operating procedures.

[0041] Step 5: Set the repeater squelch status.

[0042] In this embodiment, the test repeater is commanded to be set to the power-on squelch state on, and then commanded to be set to the squelch state off.

[0043] Step 6: Set the transponder gain level and record the test spectrum.

[0044] In this embodiment, following the repeater state of step 105, the gain level is continuously set, the level is gradually increased as required to obtain spectrum data, and the test data after each increase in the level is recorded respectively.

[0045] Step 7: Compare the spectrum data to determine the on / off state of the RF switch at the position to be tested.

[0046] If there is an uplink signal in the repeater channel used in the test, if a signal consistent with the uplink signal waveform characteristics can be gradually observed in the test spectrum recorded from low to high in step 6, and the signal level gradually increases, then the RF switch position to be tested is on, otherwise the RF switch position to be tested is off;

[0047] If there is no uplink signal in the transponder channel used in the test, if the noise spectrum can be gradually observed in the test spectrum recorded from low to high in step 6, and the waveform characteristics of the noise spectrum are consistent with the noise spectrum recorded during the test of the transponder channel on the ground during the satellite development phase, and the signal level gradually increases, then the RF switch position to be tested is on, otherwise the RF switch position to be tested is off.

Claims

1. A method for determining the position of a satellite radio frequency switch without telemetry on orbit, characterized in that: The steps include: S1: When the RF switch is in the position to be tested, select the transponder channel to be used for the test; S2: Limit the normal value range of telemetry of the selected test repeater during the test process, so that the actual telemetry of the repeater during the test process does not exceed the normal value range of telemetry; S3: Start the test, adjust the positions of all other RF switches in the selected test repeater channel except the RF switch to be tested, and connect the RF switch to be tested and the selected repeater channel; S4: Set the repeater squelch state; S5: With the transponder squelch closed, set the transponder gain gear from low to high, and record the spectrum after each gear adjustment; S6: Compare the spectrum data to determine the on / off state of the RF switch at the position to be tested.

2. The method for determining the position of a satellite radio frequency switch in orbit without telemetry according to claim 1, characterized in that: When comparing the spectrum data in step S6, if there is an uplink signal in the selected test repeater channel, if a signal consistent with the waveform characteristics of the uplink signal can be gradually observed in the spectrum recorded at different gears from low to high obtained in step S5, and the signal level gradually increases, then the RF switch position to be tested is on, otherwise the RF switch position to be tested is off; When comparing the spectrum data in step S6, when there is no uplink signal in the selected test repeater channel, if the noise spectrum can be gradually observed in the spectrum recorded at different gears from low to high obtained in step S5, and the waveform characteristics of the noise spectrum are consistent with the noise spectrum recorded during the test of the repeater channel on the ground during the satellite development phase, and the signal level gradually increases, then the RF switch position to be tested is on, otherwise the RF switch position to be tested is off.

3. The method for determining the position of a satellite radio frequency switch in an on-orbit non-telemetry environment according to claim 1, characterized in that: In step S1, if there are multiple positions to be tested for the RF switch, a repeater channel to be used for the test is selected for each position to be tested, and then S2 to S6 are executed to test them one by one; Spectrum monitoring equipment is set up in advance within the downlink coverage area of ​​the repeater channel selected for the test.

4. The method for determining the position of a satellite radio frequency switch in an on-orbit non-telemetry environment according to claim 1, characterized in that: In step S2, the telemetry normal value range is the telemetry parameter characteristics of the selected transponder under normal startup conditions, and the telemetry parameters include the spiral current, the anode voltage and the bus current; The normal value range of telemetry is: the spiral current value is maintained at 0-1 mA, the anode voltage value is maintained within 50 volts above or below the operating voltage, and the bus current is maintained at 0-3 amperes; If the actual telemetry of the repeater exceeds the normal telemetry value range during the test, the repeater should be shut down immediately.

5. The method for determining the position of a satellite radio frequency switch in an on-orbit non-telemetry condition according to claim 1, characterized in that: Also includes: After step S2 and before step S3, the instructions and telemetry codes required for the test are sorted out and used directly during the test.

6. The method for determining the position of a satellite radio frequency switch in orbit without telemetry according to claim 5, characterized in that: The instructions include: RF switch rotation instructions, transponder power-on instructions, transponder power-off instructions, transponder gain level setting instructions, and transponder squelch state setting instructions; The telemetry codes include: RF switch position telemetry, transponder on / off status telemetry, transponder gain gear telemetry, and transponder squelch status telemetry.

7. The method for determining the position of a satellite radio frequency switch in an on-orbit non-telemetry environment according to claim 1, characterized in that: When setting the repeater squelch state in step S4, the repeater should be turned on and preheated; In step S4, the repeater states are set to be a squelch-on state and a squelch-off state, respectively.

8. The method for determining the position of a satellite radio frequency switch in orbit without telemetry according to claim 1, characterized in that: When setting the gain gear of the repeater in step S5, use the fixed gain mode, and adjust gradually from zero gear to the designed working gear and then to the highest gear, from low to high, and the adjustment step shall not exceed 1 / 4 of the working gear; when recording the spectrum in step S5, the spectrum range should cover the entire frequency band of the repeater channel.

9. The method for determining the position of a satellite radio frequency switch in orbit without telemetry according to claim 8, characterized in that: The designed working position of the transponder should be the position determined during the initial in-orbit test of the satellite launch, or the position determined according to user requirements during long-term in-orbit use.

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