CN108957489B - Ground test verification system and method for low-earth-orbit satellite navigation enhancement signals - Google Patents
Ground test verification system and method for low-earth-orbit satellite navigation enhancement signals Download PDFInfo
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- CN108957489B CN108957489B CN201810527154.4A CN201810527154A CN108957489B CN 108957489 B CN108957489 B CN 108957489B CN 201810527154 A CN201810527154 A CN 201810527154A CN 108957489 B CN108957489 B CN 108957489B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/20—Integrity monitoring, fault detection or fault isolation of space segment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
Abstract
The invention discloses a ground test verification system and a ground test verification method for a low earth orbit satellite navigation enhancement signal, which can realize ground test verification on the navigation signal of a low earth orbit satellite. The specific scheme is as follows: the low earth orbit satellite broadcasts a satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier is added in a non-occupied time slot of the navigation enhancement signal; the ground test verification system is realized by adopting the following mode: controlling a high-gain antenna to automatically track a signal broadcast by a satellite platform end by using an antenna controller; receiving a satellite navigation enhancement signal by using a high-gain antenna with the gain not less than 40db, and tracking and locking the satellite navigation enhancement signal by using a wave beam by using a non-spread spectrum modulation carrier as a beacon signal; and filtering the satellite navigation enhancement signal by using a filter and dividing the satellite navigation enhancement signal into two paths of output, wherein one path of output is output to a general frequency spectrograph for spectrum analysis, and the other path of output is connected to radio frequency acquisition playback equipment for post-processing analysis.
Description
Technical Field
The invention relates to the technical field of satellite signal ground test verification, in particular to a ground test verification system and method for low-earth-orbit satellite navigation enhancement signals.
Background
Global Navigation Satellite Systems (GNSS) have played a great role in various aspects such as military affairs and civil use, and the navigation enhancement technology aims to assist GNSS in various aspects such as continuity, coverage, positioning performance and integrity. From the principle of enhancement, two categories of signal enhancement and information enhancement can be essentially distinguished.
Navigation signals have natural vulnerability, the ground level is submerged below noise, and low-orbit satellite navigation signals are no exception, so that the signal spectrum waveform is difficult to be directly observed by general equipment such as a frequency spectrograph during a signal ground receiving test.
At the initial stage of low-earth orbit satellite navigation signal test verification, uncertain states and factors are numerous, and mainly include: whether a navigation signal is broadcast or not based on a low earth orbit satellite, whether the landing level of the navigation signal is consistent with the estimated value of the initial link budget, whether a ground receiving system is normal or not, whether a ground processing method is correct or not and the like. Problems in either link may result in the low earth orbit satellite navigation signals not being properly demodulated.
Fig. 1 is a diagram of a conventional system for testing and verifying a navigation enhancement signal broadcast by a low-earth orbit satellite platform, in which a ground receiving device includes an omnidirectional antenna, a filter, a receiving device, and a data display and analysis device, which are sequentially connected to each other in a conventional navigation enhancement signal format. The system has three difficulties in early-stage test and verification: firstly, the level of a ground signal is lower than that of noise, and a general spectrum observation device cannot detect the signal; secondly, compared with the ground signal transmitting equipment, the satellite platform state monitoring difficulty is increased, and the signal testing phenomenon is difficult to reproduce; third, the satellite platform has high emission cost, and the early signal design should have a sustainable improvement upgrading strategy.
At present, no ground test verification system or method can overcome the difficulties and carry out ground test verification on the navigation signals of the low-orbit satellite.
Disclosure of Invention
In view of this, the present invention provides a ground test verification system and method for a low earth orbit satellite navigation enhancement signal, which can overcome the difficulties in the prior art and realize ground test verification of a navigation signal of a low earth orbit satellite.
In order to achieve the above purpose, the invention provides a ground test verification system for a low-earth orbit satellite navigation enhancement signal, wherein the low-earth orbit satellite broadcasts the satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier is added in a non-occupied time slot of the navigation enhancement signal.
The ground test verification system comprises an antenna controller, a high-gain antenna, a filter, a frequency spectrograph, radio frequency acquisition playback equipment and post-processing analysis equipment.
The antenna controller is provided with ephemeris information and controls the high-gain antenna to automatically track signals broadcast by the satellite platform according to the ephemeris information.
The high-gain antenna has a gain not less than 40db, is used for receiving satellite navigation enhancement signals, and simultaneously uses non-spread spectrum modulation carrier as a beacon signal to track and lock the satellite navigation enhancement signals by using wave beams.
The filter filters satellite navigation enhancement signals received by the high-gain antenna and divides the satellite navigation enhancement signals into two paths of output, wherein one path of output is connected to the general frequency spectrograph, and the other path of output is connected to the radio frequency acquisition playback equipment;
the universal frequency spectrograph is used for carrying out frequency spectrum analysis on the satellite navigation enhancement signals.
The radio frequency acquisition playback equipment is used for acquiring and playing back the satellite navigation enhancement signals and sending the satellite navigation enhancement signals to the post-processing analysis equipment.
The post-processing analysis equipment acquires frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph, selects reciprocal values of the RBW parameters as integration time, respectively generates local non-spread spectrum modulation carriers, local spread spectrum modulation carriers and satellite navigation enhancement signals to perform matching correlation operation, and calculates carrier frequency points and spread spectrum code phases of the satellite navigation enhancement signals.
Further, the signal system of the navigation enhancing signal is as follows:
the method comprises the steps that a frame is taken as a cycle for repetition, each frame comprises 3 subframes which are respectively marked as a first subframe, a second subframe and a third subframe, each subframe is divided into 8 time slots, the time slot parameters of each subframe are configured through upper notes, and the time slot parameters comprise synchronization head configuration parameters, signal power configuration parameters and configuration parameters of the first subframe to the third subframe.
The configuration parameters of the subframe comprise subframe number, time slot pattern and spreading sequence configuration.
The time slot pattern is 8 bits, the high bit to the low bit respectively corresponds to the first time slot to the eighth time slot, each bit has 1 and 0 states, when the bit is 1, the corresponding time slot is a signal broadcasting time slot, and the bit is 0, which indicates that the corresponding time slot is idle.
The spreading sequence is 32 bits, that is, 4 bytes, each half byte corresponds to a spreading sequence index, and the spreading sequences respectively correspond to the first time slot to the eighth time slot from high to low, wherein the spreading sequence indexes are 1 to 14 corresponding spreading sequences, the spreading sequences are non-spreading carriers when the spreading sequence index is 15, and the corresponding time slot is unoccupied when the spreading sequence index is 0.
Furthermore, the invention also provides a test verification method of the ground test verification system of the low-earth-orbit satellite navigation enhancement signal, and the ground test verification system comprises the following steps:
step one, a low earth orbit satellite broadcasts a satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier is added in a non-occupied time slot of the navigation enhancement signal.
Ephemeris information is input into the antenna controller, and the antenna controller controls the high-gain antenna to automatically track signals broadcast by the satellite platform according to the ephemeris information.
The filter filters the satellite navigation enhancement signals received by the high-gain antenna and divides the satellite navigation enhancement signals into two paths of output, wherein one path of output is connected to the general frequency spectrograph, and the other path of output is connected to the radio frequency acquisition playback equipment.
Step two, adjusting frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph, wherein the specific method comprises the following steps:
the method comprises the steps that RBW parameters of the resolution bandwidth of a universal frequency spectrograph are selected according to signal characteristics of a navigation enhancement signal, when a signal subframe period is T1, the RBW parameters are adjusted downwards in a stepping mode of 1kHz from the highest 1/T1 until the universal frequency spectrograph observes and obtains a single carrier frequency spectrum of a satellite enhancement signal, the corresponding RBW parameters are finally set RBW parameters, and the single carrier frequency point at the moment is recorded for setting frequency point parameters; and setting the sweep frequency time parameter according to the requirement of ground test verification.
And thirdly, acquiring frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph by post-processing analysis equipment, selecting reciprocal values of the RBW parameters as integration time, respectively generating local non-spread spectrum modulation carriers, local spread spectrum modulation carriers and satellite navigation enhancement signals to perform matching correlation operation, and calculating carrier frequency points and spread spectrum code phases of the satellite navigation enhancement signals.
Has the advantages that:
(1) according to the invention, the non-spread spectrum modulation carrier is added in the non-occupied time slot of the satellite navigation enhancement signal, so that the automatic tracking of the high-gain antenna can be effectively assisted in the initial stage of the satellite navigation enhancement signal verification, and the spectrum observation is facilitated; after the satellite navigation enhanced signal is filtered, the satellite navigation enhanced signal is divided into two paths, one path adopts a general frequency spectrograph to carry out frequency spectrum observation, and the other path enters radio frequency acquisition playback equipment, so that the synchronous performance of frequency spectrum observation and data acquisition is ensured, meanwhile, the data is subjected to post-processing analysis, the original real-time processing mode is replaced, the problem details are favorably amplified, and the problem moment is accurately positioned; the invention adopts the integrated design of the radio frequency acquisition playback equipment to backtrack the acquired radio frequency signals, is favorable for the reproduction of problems and assists the real-time processing of the next stage.
(2) The invention improves the format of the satellite navigation enhancement signal, wherein the time slot pattern setting indicates the time domain distribution and the duration of the satellite navigation enhancement signal, the spread spectrum sequence configuration indicates the spread spectrum sequence state, the signal power configuration indicates the transmitting power of the satellite navigation enhancement signal, the improved format of the navigation enhancement signal is a universal configurable table, and the configuration can be carried out through a satellite upper injection interface, so as to achieve the aim of testing and verifying the performance under the maximum envelope signal format by using the minimum satellite platform, thereby testing and verifying the signal performance under various signal parameters by using a single satellite platform, and being beneficial to the smooth transition from the initial verification to the actual application stage.
Drawings
Fig. 1 is a schematic structural diagram of a navigation enhancement signal format and a test verification system broadcast by a conventional low-earth orbit satellite platform;
FIG. 2 is a schematic diagram of a low earth orbit satellite navigation enhancement signal format and a ground test verification system according to the present invention;
fig. 3 is a schematic diagram of a format of a satellite navigation enhancement signal according to an embodiment of the invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides a ground test verification system and a ground test verification method for a low-earth-orbit satellite navigation enhancement signal, and 1, the ground test verification system for the low-earth-orbit satellite navigation enhancement signal is characterized in that the low-earth-orbit satellite broadcasts the satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier wave is added in a non-occupied time slot of the navigation enhancement signal. In the embodiment of the invention, the non-spread spectrum modulation carrier is an auxiliary carrier signal for de-spreading processing.
The ground test verification system comprises an antenna controller, a high-gain antenna, a filter, a frequency spectrograph, radio frequency acquisition playback equipment and post-processing analysis equipment;
the antenna controller is provided with ephemeris information and controls the high-gain antenna to automatically track signals broadcast by the satellite platform end according to the ephemeris information;
the high-gain antenna has a gain not less than 40db, is used for receiving satellite navigation enhancement signals, and simultaneously uses non-spread spectrum modulation carrier as a beacon signal to track and lock the satellite navigation enhancement signals by using wave beams. Wherein the high gain antenna is capable of actively tracking lock after receiving the beacon signal.
The filter filters satellite navigation enhancement signals received by the high-gain antenna and divides the satellite navigation enhancement signals into two paths of output, wherein one path of output is connected to the general frequency spectrograph, and the other path of output is connected to the radio frequency acquisition playback equipment;
the universal frequency spectrograph is used for carrying out frequency spectrum analysis on the satellite navigation enhancement signal;
the radio frequency acquisition playback equipment is used for acquiring and playing back the satellite navigation enhancement signal and sending the satellite navigation enhancement signal to the post-processing analysis equipment;
the post-processing analysis equipment acquires frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph, selects reciprocal values of the RBW parameters as integration time, respectively generates local non-spread spectrum modulated carriers and local spread spectrum modulated carriers, respectively performs matching correlation operation on the local non-spread spectrum modulated carriers and the local spread spectrum modulated carriers and satellite navigation enhancement signals, and calculates satellite navigation enhancement signal carrier frequency points and spread spectrum code phases. The reciprocal value of the RBW parameter is selected as the integral time, and the local non-spread spectrum modulation carrier and the local spread spectrum modulation carrier are respectively generated by adopting the existing method. The local non-spread spectrum modulation carrier and the local spread spectrum modulation carrier are respectively matched with the satellite navigation enhancement signal for correlation operation, and the calculation of the carrier frequency point and the spread spectrum code phase of the satellite navigation enhancement signal can also be solved by adopting the existing method.
Fig. 2 shows a signal system of the navigation enhancement signal, which specifically includes: the method comprises the steps that a frame is taken as a cycle for repetition, each frame comprises 3 subframes which are respectively marked as a first subframe, a second subframe and a third subframe, each subframe is divided into 8 time slots, the time slot parameters of each subframe are configured through upper notes, and the time slot parameters comprise synchronization head configuration parameters, signal power configuration parameters and configuration parameters of the first subframe to the third subframe.
The configuration parameters of the subframe comprise subframe number, time slot pattern and spread spectrum sequence configuration;
the time slot pattern is 8 bits, the time slot pattern respectively corresponds to a first time slot to an eighth time slot from high bit to low bit, each bit has 1 state and 0 state, when the bit is 1, the corresponding time slot is a signal broadcasting time slot which can be used for broadcasting a spread spectrum sequence or a non-spread spectrum modulation carrier, and the bit is 0 to indicate that the corresponding time slot is idle.
The spreading sequence is 32 bits, that is, 4 bytes, each half byte corresponds to a spreading sequence index, and the spreading sequences respectively correspond to the first time slot to the eighth time slot from high to low, wherein the spreading sequence indexes are 1 to 14 corresponding spreading sequences, the spreading sequences are non-spreading carriers when the spreading sequence index is 15, and the corresponding time slot is unoccupied when the spreading sequence index is 0.
For example, in subframe 1 shown in fig. 2, the spreading sequence is 0x159AFFFF, which means that the spreading sequences corresponding to slot 1 to slot 4 are 1, 5, 9, 10, and the spreading sequences corresponding to slot 5 to slot 8 are non-spreading subcarriers. The spreading sequence in the sub-frame 2 is 0x1000FFFF, which means that the spreading sequence corresponding to the time slot 1 is 1, the time slots 2-4 are idle, and the time slots 5-8 are non-spreading auxiliary carriers. The spreading sequence in the subframe 3 is 0xFFFF1100, which means that the time slots 1-4 correspond to non-spreading auxiliary carriers, the spreading sequences corresponding to the time slots 5-6 are all 1, and the time slots 7-8 are idle.
The embodiment of the invention also provides a test verification method based on the ground test verification system of the low-earth-orbit satellite navigation enhanced signal, which comprises the following steps:
step one, a low earth orbit satellite broadcasts a satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier is added in a non-occupied time slot of the navigation enhancement signal.
Ephemeris information is input into the antenna controller, and the antenna controller controls the high-gain antenna to automatically track signals broadcast by the satellite platform according to the ephemeris information.
The filter filters the satellite navigation enhancement signals received by the high-gain antenna and divides the satellite navigation enhancement signals into two paths of output, wherein one path of output is connected to the general frequency spectrograph, and the other path of output is connected to the radio frequency acquisition playback equipment.
Step two, adjusting frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph, wherein the specific method comprises the following steps:
the method comprises the steps that RBW parameters of the resolution bandwidth of a universal frequency spectrograph are selected according to signal characteristics of a navigation enhancement signal, when a signal subframe period is T1, the RBW parameters are adjusted downwards in a stepping mode of 1kHz from the highest 1/T1 until the universal frequency spectrograph observes and obtains a single carrier frequency spectrum of a satellite enhancement signal, the corresponding RBW parameters are finally set RBW parameters, and the single carrier frequency point at the moment is recorded for setting frequency point parameters; and setting the sweep frequency time parameter according to the requirement of ground test verification.
And thirdly, acquiring frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph by post-processing analysis equipment, selecting reciprocal values of the RBW parameters as integration time, respectively generating local non-spread spectrum modulation carriers, local spread spectrum modulation carriers and satellite navigation enhancement signals to perform matching correlation operation, and calculating carrier frequency points and spread spectrum code phases of the satellite navigation enhancement signals.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A ground test verification system of a low-earth-orbit satellite navigation enhancement signal is characterized in that the low-earth-orbit satellite broadcasts the satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier is added in a non-occupied time slot of the navigation enhancement signal;
the ground test verification system comprises an antenna controller, a high-gain antenna, a filter, a frequency spectrograph, radio frequency acquisition playback equipment and post-processing analysis equipment;
the antenna controller is provided with ephemeris information and controls the high-gain antenna to automatically track signals broadcast by a satellite platform end according to the ephemeris information;
the high-gain antenna has a gain not less than 40db and is used for receiving the satellite navigation enhancement signal, and simultaneously tracking and locking the satellite navigation enhancement signal by using a wave beam by taking the non-spread spectrum modulation carrier as a beacon signal;
the filter filters the satellite navigation enhancement signals received by the high-gain antenna and divides the satellite navigation enhancement signals into two paths of output, one path of output is connected to the general frequency spectrograph, and the other path of output is connected to the radio frequency acquisition playback equipment;
the universal frequency spectrograph is used for carrying out frequency spectrum analysis on the satellite navigation enhancement signal;
the radio frequency acquisition playback equipment is used for acquiring and playing back the satellite navigation enhancement signal and sending the satellite navigation enhancement signal to the post-processing analysis equipment;
the post-processing analysis equipment acquires frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph, selects reciprocal values of the RBW parameters as integration time, respectively generates local non-spread spectrum modulation carriers and local spread spectrum modulation carriers, performs matching correlation operation on the local non-spread spectrum modulation carriers and the local spread spectrum modulation carriers and the satellite navigation enhancement signals, and calculates carrier frequency points and spread spectrum code phases of the satellite navigation enhancement signals.
2. The system of claim 1, wherein the signal regime of the navigation enhancement signal is:
repeating the frame as a period, wherein each frame comprises 3 subframes which are respectively marked as a first subframe, a second subframe and a third subframe, each subframe is divided into 8 time slots, the time slot parameters of each subframe are configured by an upper injection, and the time slot parameters comprise synchronization head configuration parameters, signal power configuration parameters and configuration parameters of the first subframe to the third subframe;
the configuration parameters of the subframe comprise subframe number, time slot pattern and spread spectrum sequence configuration;
the time slot pattern is 8 bits, the high bit to the low bit respectively corresponds to a first time slot to an eighth time slot, each bit has two states of 1 and 0, when the bit is 1, the corresponding time slot is a signal broadcasting time slot, and the bit is 0, which indicates that the corresponding time slot is idle;
the spreading sequence is 32 bits, that is, 4 bytes, each half byte corresponds to a spreading sequence index, and the spreading sequences respectively correspond to the first time slot to the eighth time slot from high to low, wherein the spreading sequence indexes are 1 to 14 corresponding spreading sequences, the spreading sequences are non-spreading carriers when the spreading sequence index is 15, and the corresponding time slot is unoccupied when the spreading sequence index is 0.
3. A test validation method for a ground test validation system of low earth orbit satellite navigation enhancement signals, characterized in that the ground test validation system of claim 1 is adopted, comprising the following steps:
firstly, a low-orbit satellite broadcasts a satellite navigation enhancement signal through a satellite platform end, and a non-spread spectrum modulation carrier is added in a non-occupied time slot of the navigation enhancement signal;
ephemeris information is input into the antenna controller, and the antenna controller controls the high-gain antenna to automatically track signals broadcast by a satellite platform end according to the ephemeris information;
the filter filters the satellite navigation enhancement signals received by the high-gain antenna and divides the satellite navigation enhancement signals into two paths of output, one path of output is connected to the general frequency spectrograph, and the other path of output is connected to the radio frequency acquisition playback equipment;
step two, adjusting the frequency point parameter, the resolution bandwidth RBW parameter and the sweep frequency time parameter of the universal frequency spectrograph, wherein the specific method comprises the following steps:
the resolution bandwidth RBW parameter of the general spectrometer is selected according to the signal characteristics of the navigation enhancement signal, when the signal subframe period is T1, the RBW parameter is adjusted downwards in a stepping mode of 1kHz from the highest 1/T1 until the general spectrometer observes and obtains the single carrier frequency spectrum of the satellite enhancement signal, the corresponding RBW parameter is the RBW parameter which is finally set at the moment, and the single carrier frequency point at the moment is recorded for setting the frequency point parameter; the sweep frequency time parameter is set according to the requirement of ground test verification;
and thirdly, the post-processing analysis equipment acquires frequency point parameters, resolution bandwidth RBW parameters and frequency sweep time parameters of the universal frequency spectrograph, selects reciprocal values of the RBW parameters as integration time, respectively generates local non-spread spectrum modulation carriers and local spread spectrum modulation carriers, performs matching correlation operation on the local non-spread spectrum modulation carriers and the local spread spectrum modulation carriers and the satellite navigation enhancement signals, and calculates carrier frequency points and spread spectrum code phases of the satellite navigation enhancement signals.
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