1. A ranging zero value calibration method for a satellite Ka spread spectrum transponder is characterized by comprising the following steps:

step 1: interconnecting a satellite Ka transponder with a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, setting the frequency of the Ka up-down converter, setting up uplink and downlink ranging signals of the measurement and control baseband equipment, calculating a ranging value R1 of a corresponding task mode after demodulation of the measurement and control baseband equipment, and sending the ranging value R1 to the measurement and control baseband equipment;

step 2: interconnecting a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, connecting an uplink ranging signal with a signal source through an uplink and downlink radio frequency cable of a satellite Ka transponder through a mixer, setting a frequency difference value of the uplink and downlink signals on the signal source, unifying the frequency of the uplink and downlink signals through the mixer, setting a baseband intermediate frequency closed-loop mode, setting the short code type of the uplink and downlink ranging signal to be unified, and measuring a ranging value R2 of a calibration mode through the measurement and control baseband equipment;

and step 3: and subtracting the ranging value R2 of the calibration mode from the ranging value R1 of the task mode to obtain a Ka transponder ranging zero value.

2. The method for calibrating ranging zeros of a satellite Ka spread spectrum transponder according to claim 1, wherein the test path of the mission mode is:

an uplink path: the measurement and control baseband equipment → the Ka up-converter → the Ka link box → the onboard Ka responder;

a downlink path: satellite Ka responder → Ka link box → Ka down converter → measurement and control baseband equipment.

3. The method for calibrating the ranging zero value of the satellite Ka spread spectrum transponder according to claim 1, wherein the calibration mode comprises the following test paths: and the measurement and control baseband equipment → the Ka up-converter → the Ka link box and the signal source → the mixer → the Ka link box → the Ka down-converter → the measurement and control baseband equipment.

4. The method as claimed in claim 1, wherein the mixer has frequency addition and subtraction functions, and in the calibration mode, the Ka up-down converter is frequency-unified by the mixer and the signal source.

5. The method for calibrating the ranging zero value of the satellite Ka spread spectrum transponder according to claim 1, wherein a task mode of the measurement and control baseband device needs to be set correspondingly during two tests, the task mode is adopted during on-satellite measurement, and an intermediate frequency closed-loop mode is adopted during ground calibration.

6. A ranging zero value calibration system of a satellite Ka spread spectrum transponder is characterized by comprising the following components:

module M1: interconnecting a satellite Ka transponder with a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, setting the frequency of the Ka up-down converter, setting up uplink and downlink ranging signals of the measurement and control baseband equipment, calculating a ranging value R1 of a corresponding task mode after demodulation of the measurement and control baseband equipment, and sending the ranging value R1 to the measurement and control baseband equipment;

module M2: interconnecting a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, connecting an uplink ranging signal with a signal source through an uplink and downlink radio frequency cable of a satellite Ka transponder through a mixer, setting a frequency difference value of the uplink and downlink signals on the signal source, unifying the frequency of the uplink and downlink signals through the mixer, setting a baseband intermediate frequency closed-loop mode, setting the short code type of the uplink and downlink ranging signal to be unified, and measuring a ranging value R2 of a calibration mode through the measurement and control baseband equipment;

module M3: and subtracting the ranging value R2 of the calibration mode from the ranging value R1 of the task mode to obtain a Ka transponder ranging zero value.

7. The satellite Ka spread spectrum transponder ranging zero calibration system as claimed in claim 6, wherein the testing path of the mission mode is:

an uplink path: the measurement and control baseband equipment → the Ka up-converter → the Ka link box → the onboard Ka responder;

a downlink path: satellite Ka responder → Ka link box → Ka down converter → measurement and control baseband equipment.

8. The satellite Ka spread spectrum transponder ranging zero calibration system as claimed in claim 6, wherein the calibration mode test path is: and the measurement and control baseband equipment → the Ka up-converter → the Ka link box and the signal source → the mixer → the Ka link box → the Ka down-converter → the measurement and control baseband equipment.

9. The satellite Ka spread spectrum transponder ranging zero calibration system of claim 6, wherein the mixer has frequency addition and subtraction functions, and in the calibration mode, the Ka up-down converter is frequency-unified by the mixer and the signal source.

10. The system of claim 6, wherein the task mode of the measurement and control baseband device is set correspondingly during two tests, the task mode is used during on-board measurement, and the intermediate frequency closed loop mode is used during ground calibration.

Background

When the satellite is in orbit tested and applied, the satellite-ground distance needs to be accurately known, so the distance zero value of the transponder needs to be calibrated in the ground test so as to be used as a reference and a basis in the in orbit test.

However, compared with the traditional general S spread spectrum transponder, the difference value of the upper frequency point and the lower frequency point of the satellite measurement and control Ka spread spectrum transponder is large, the commonly used frequency converter cannot unify the upper frequency point and the lower frequency point, and as the types of the current satellite tasks are increased, the application of the Ka spread spectrum transponder in the satellite measurement and control is increased day by day, a method for calibrating the ranging zero value of the satellite Ka spread spectrum transponder is needed to complete the calibration of the ranging zero value of the satellite Ka spread spectrum transponder.

Patent document CN107797098B (application number: CN201710800938.5) discloses a distance zero value calibration method and system based on measurement, control and data transmission integration, the patent focuses on the calibration method, the transponder is in S frequency band and uses a zero calibration frequency converter to solve the problem of different uplink and downlink radio frequency characteristics, which is different from the distance measurement zero value calibration method of the satellite Ka spread spectrum transponder of the present invention.

Patent document CN101510631B (application number: CN200910073886.1) discloses a remote control calibration device based on Ka frequency standard source, which proposes a remote control calibration device for remote monitoring to solve the problem of angle calibration and distance zero value calibration of Ka band measurement and control station, but is different from the method for calibrating distance zero value of satellite Ka spread spectrum transponder of the present invention.

Patent document CN111060931A (application number: CN201911060916.5) discloses a high-precision measurement method and system for satellite ground measurement and control link distance zero, which is different from the calibration method for satellite Ka spread spectrum transponder distance measurement zero of the present invention, although the patent designs a loop component for measuring distance zero and provides measurement and control link fault point investigation for achieving high-precision measurement.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a ranging zero value calibration method and system for a satellite Ka spread spectrum transponder.

The ranging zero value calibration method of the satellite Ka spread spectrum transponder provided by the invention comprises the following steps:

step 1: interconnecting a satellite Ka transponder with a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, setting the frequency of the Ka up-down converter, setting up uplink and downlink ranging signals of the measurement and control baseband equipment, calculating a ranging value R1 of a corresponding task mode after demodulation of the measurement and control baseband equipment, and sending the ranging value R1 to the measurement and control baseband equipment;

step 2: interconnecting a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, connecting an uplink ranging signal with a signal source through an uplink and downlink radio frequency cable of a satellite Ka transponder through a mixer, setting a frequency difference value of the uplink and downlink signals on the signal source, unifying the frequency of the uplink and downlink signals through the mixer, setting a baseband intermediate frequency closed-loop mode, setting the short code type of the uplink and downlink ranging signal to be unified, and measuring a ranging value R2 of a calibration mode through the measurement and control baseband equipment;

and step 3: and subtracting the ranging value R2 of the calibration mode from the ranging value R1 of the task mode to obtain a Ka transponder ranging zero value.

Preferably, the test path of the task mode is:

an uplink path: the measurement and control baseband equipment → the Ka up-converter → the Ka link box → the onboard Ka responder;

a downlink path: satellite Ka responder → Ka link box → Ka down converter → measurement and control baseband equipment.

Preferably, the test path of the calibration mode is: and the measurement and control baseband equipment → the Ka up-converter → the Ka link box and the signal source → the mixer → the Ka link box → the Ka down-converter → the measurement and control baseband equipment.

Preferably, the mixer has a frequency adding and subtracting function, and in the calibration mode, the Ka up-down converter is frequency-unified through the mixer and the signal source.

Preferably, the task mode of the measurement and control baseband equipment needs to be correspondingly set during two tests, the task mode is adopted during on-satellite measurement, and the intermediate frequency closed-loop mode is adopted during ground calibration.

The ranging zero value calibration system of the satellite Ka spread spectrum transponder provided by the invention comprises:

module M1: interconnecting a satellite Ka transponder with a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, setting the frequency of the Ka up-down converter, setting up uplink and downlink ranging signals of the measurement and control baseband equipment, calculating a ranging value R1 of a corresponding task mode after demodulation of the measurement and control baseband equipment, and sending the ranging value R1 to the measurement and control baseband equipment;

module M2: interconnecting a ground Ka link box, a Ka up-down converter and measurement and control baseband equipment, connecting an uplink ranging signal with a signal source through an uplink and downlink radio frequency cable of a satellite Ka transponder through a mixer, setting a frequency difference value of the uplink and downlink signals on the signal source, unifying the frequency of the uplink and downlink signals through the mixer, setting a baseband intermediate frequency closed-loop mode, setting the short code type of the uplink and downlink ranging signal to be unified, and measuring a ranging value R2 of a calibration mode through the measurement and control baseband equipment;

module M3: and subtracting the ranging value R2 of the calibration mode from the ranging value R1 of the task mode to obtain a Ka transponder ranging zero value.

Preferably, the test path of the task mode is:

an uplink path: the measurement and control baseband equipment → the Ka up-converter → the Ka link box → the onboard Ka responder;

a downlink path: satellite Ka responder → Ka link box → Ka down converter → measurement and control baseband equipment.

Preferably, the test path of the calibration mode is: and the measurement and control baseband equipment → the Ka up-converter → the Ka link box and the signal source → the mixer → the Ka link box → the Ka down-converter → the measurement and control baseband equipment.

Preferably, the mixer has a frequency adding and subtracting function, and in the calibration mode, the Ka up-down converter is frequency-unified through the mixer and the signal source.

Preferably, the task mode of the measurement and control baseband equipment needs to be correspondingly set during two tests, the task mode is adopted during on-satellite measurement, and the intermediate frequency closed-loop mode is adopted during ground calibration.

Compared with the prior art, the invention has the following beneficial effects:

the method for calibrating the ranging zero value of the satellite Ka spread spectrum transponder overcomes the defects that the difference value of the upper frequency point and the lower frequency point of the Ka transponder is large and the existing Ka up-converter and Ka down-converter cannot be set at the same frequency.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a component diagram of ranging zero calibration of a satellite Ka spread spectrum transponder;

FIG. 2 is a diagram of the ranging connection of the Ka transponder in mission mode;

FIG. 3 is a ranging connection diagram for the Ka transponder in calibration mode.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.

Example (b):

the ranging zero value calibration method of the satellite Ka spread spectrum transponder provided by the invention comprises the following steps: ka spread spectrum transponder, ground Ka link box, Ka up/down converter, mixer, measurement and control baseband: the Ka spread spectrum transponder belongs to a satellite product, and the invention completes channel transmission of uplink ranging and downlink ranging and completes tracking ranging and orbit determination of a satellite by matching with the ground. The Ka link box belongs to ground equipment, mainly realizes the functions of channel selection, power conditioning, monitoring control and the like of a measurement and control uplink and downlink, and simultaneously all uplink and downlink signals are output by coupling to a switch. The Ka up/down converter belongs to ground equipment, mainly comprises a Ka up converter and a Ka down converter and supports a spread spectrum system. The frequency mixer belongs to ground equipment, has the main function of enabling the frequency of an output signal to be equal to the sum or the difference of the frequencies of two input signals or be a circuit of other combinations of the two input signals, and the measurement and control baseband belongs to the ground equipment and can set different working modes including a task mode and an intermediate frequency closed-loop working mode. The method mainly comprises the steps that after modulation is completed, signals are sent to an intermediate frequency interface, and sent to a satellite through up-conversion to send ranging signals; and receiving satellite ranging signals, finishing down-conversion and baseband demodulation, and sending to a measurement and control center management computer. The Ka spread spectrum transponder, the Ka link box, the Ka up/down converter, the frequency mixer and the measurement and control baseband are connected with each other through a radio frequency cable, and the measurement and control baseband is connected into the integrated measurement network.

The invention relates to a ranging zero value calibration method of a satellite Ka spread spectrum transponder, which is implemented according to the following steps: step 1: interconnecting a satellite Ka transponder with a ground Ka link box, a Ka up/down converter and measurement and control baseband equipment, setting the frequency of the up converter and the frequency of the down converter, setting up uplink and downlink distance measurement signals of the baseband equipment, calculating a distance measurement value R1 in a corresponding task mode after the baseband demodulation, and sending the distance measurement value R1 to the measurement and control baseband equipment; step 2: and (2) interconnecting a ground measurement and control baseband, a Ka up-down converter and a Ka link box, then detaching the uplink and downlink original-matched radio frequency cables of the onboard Ka responder in the step (1), connecting uplink ranging signals with a signal source through a mixer, setting the signal source to unify the frequency of the uplink and downlink signals, setting a baseband intermediate frequency closed-loop mode, setting the types of short codes of the uplink and downlink ranging signals to be unified, and measuring a ranging value R2 in a calibration mode by baseband equipment. And step 3: and subtracting the ranging value R2 in the calibration mode from the ranging value R1 in the task mode to obtain a Ka transponder ranging zero value.

The invention provides a method for calibrating a ranging zero value of a satellite Ka spread spectrum transponder, and fig. 1 shows a method for calculating the ranging zero value of the satellite Ka spread spectrum transponder.

As shown in fig. 2, the satellite Ka transponder, the ground Ka link box, the Ka up/down converter and the measurement and control baseband device are interconnected through a radio frequency cable, the frequency of the up converter and the frequency of the down converter are set, the uplink and downlink distance measurement signals of the baseband device are set, the baseband demodulates and then calculates a distance measurement value R1 in a corresponding task mode, and sends the distance measurement value R1 to the measurement and control baseband device;

as shown in fig. 3, the ground measurement and control baseband, the Ka up-down converter and the Ka link box are interconnected, the uplink and downlink original radio frequency cables of the star Ka transponder in step 1 are detached, the uplink ranging signal and the signal source are connected through the mixer, the signal source is set to unify the frequency of the uplink and downlink signals, the operating mode of the baseband is set to be the intermediate frequency closed-loop mode, the modulation parameter and the ranging channel parameter in the receiving parameter are set at the same time, the short code type of the uplink and downlink ranging signal is set to be unified, and the baseband device measures the ranging value R2 in the calibration mode.

And finally, subtracting the ranging value R2 in the calibration mode from the ranging value R1 in the task mode to obtain a Ka transponder ranging zero value.

In conclusion, the method for calibrating the ranging zero value of the satellite Ka spread spectrum transponder solves the defects that the difference value of the upper frequency point and the lower frequency point of the Ka transponder is large, and the existing Ka up-converter and Ka down-converter cannot be arranged at the same frequency.

Those skilled in the art will appreciate that, in addition to implementing the systems, apparatus, and various modules thereof provided by the present invention in purely computer readable program code, the same procedures can be implemented entirely by logically programming method steps such that the systems, apparatus, and various modules thereof are provided in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Therefore, the system, the device and the modules thereof provided by the present invention can be considered as a hardware component, and the modules included in the system, the device and the modules thereof for implementing various programs can also be considered as structures in the hardware component; modules for performing various functions may also be considered to be both software programs for performing the methods and structures within hardware components.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.