CN108089182B - Incoherent ranging system and incoherent ranging method - Google Patents
Incoherent ranging system and incoherent ranging method Download PDFInfo
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- CN108089182B CN108089182B CN201711325732.8A CN201711325732A CN108089182B CN 108089182 B CN108089182 B CN 108089182B CN 201711325732 A CN201711325732 A CN 201711325732A CN 108089182 B CN108089182 B CN 108089182B
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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
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/06—Systems determining position data of a target
- G01S13/08—Systems for measuring distance only
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention discloses an incoherent ranging system and an incoherent ranging method, wherein the system and the method are based on incoherent spread spectrum ranging of sampling point counting, three modules are associated together by utilizing a sampling point, high-precision incoherent ranging is realized in digital array ranging equipment, the problem that the traditional mode is difficult to use for ranging caused by mutual separation of the modules in the digital array ranging equipment is solved, and the digital array antenna technology can be applied to the incoherent ranging system. The method solves the contradiction between the traditional incoherent ranging mode and the digital array antenna, so that the digital array antenna technology can be applied to an incoherent ranging system, and meanwhile, the method has the advantages of simplicity, convenience, easiness in engineering realization and the like, and has a good engineering practical effect.
Description
Technical Field
The invention relates to the technical field of aerospace. More particularly, the present invention relates to a non-coherent ranging system and a non-coherent ranging method, and more particularly, to a spread spectrum non-coherent ranging system and a spread spectrum non-coherent ranging method using a sampling point count applied to a digital array ranging apparatus.
Background
The principle of incoherent spread spectrum ranging is as follows: the ground and air distance measuring equipment converts the phase difference of the received and transmitted spread spectrum codes into transmission time delay to calculate the distance, and the distance measuring function of the ground and air distance measuring equipment is realized. Conventional non-coherent spread spectrum ranging devices typically include a transmit signal module, a receive signal module, and a signal processing module.
A transmitting signal module of the ground ranging equipment transmits an uplink spread spectrum signal to the aerial ranging equipment by using an uplink, and a receiving signal module of the aerial ranging equipment receives the uplink spread spectrum signal, samples the uplink spread spectrum signal by using the frame synchronization of the transmitting signal module of the aerial ranging equipment and transmits the uplink spread spectrum signal to a signal processing module to extract uplink spread spectrum code phase information 1; similarly, a transmitting signal module of the aerial distance measuring equipment transmits a downlink spread spectrum signal to the ground distance measuring equipment by using a downlink, a receiving signal module of the ground distance measuring equipment samples the downlink spread spectrum signal, sends the downlink spread spectrum signal to a signal processing module to extract frame synchronization, sends the frame synchronization to a transmitting signal module, and samples an uplink spread spectrum signal by using the frame synchronization to obtain uplink spread spectrum code phase information 2; and subtracting the phase information of the two uplink spread spectrum codes to obtain the distance between the two ranging devices.
The digital array antenna is a new system antenna, integrates a transmitting signal module and a receiving signal module, and utilizes a digital beam forming technology to control the amplitude and the phase of a transmitting signal and a receiving signal of each module in a digital domain so as to form more flexible beams in space. And combining the digital array antenna technology with the ranging equipment to obtain the digital array ranging equipment. However, in the digital array ranging device, the transmitting signal module and the receiving signal module are integrated in the digital array antenna, and the signal processing module is located outside the digital array antenna, unlike the traditional ranging device in which three modules are all tightly connected, the traditional incoherent ranging method is difficult to realize by using the digital array antenna.
Disclosure of Invention
An object of the present invention is to provide a non-coherent ranging system, which solves the problem that the traditional ranging method is difficult to use because a transmitting signal module, a receiving signal module and a signal processing module are separated in a digital array ranging device.
Another objective of the present invention is to provide a non-coherent ranging method, which associates a signal transmitting module, a signal receiving module and a signal processing module together by using a sampling point, so as to implement high-precision non-coherent ranging in a digital array ranging device, and solve the problem that the conventional ranging is difficult to use due to the separation of three modules in the digital array ranging device, so that the digital array antenna technology can be applied to a non-coherent ranging system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the invention relates to a non-coherent ranging system comprising:
the first array antenna receives an uplink spread spectrum signal sent by the second array antenna based on an uplink and samples the uplink spread spectrum signal; or, transmitting a downlink spread spectrum signal synchronized with phase information of the uplink spread spectrum signal based on a downlink;
the first processing module is used for processing the sampling signal of the uplink spread spectrum signal to obtain the phase information of the uplink spread spectrum signal;
the second array antenna receives the downlink spread spectrum signals sent by the first array antenna based on the downlink and samples the downlink spread spectrum signals; or, transmitting an uplink spread spectrum signal synchronized with phase information of the downlink spread spectrum signal based on the uplink;
the second processing module is used for processing the sampling signal of the downlink spread spectrum signal to obtain the phase information of the downlink spread spectrum signal;
the distance measurement module processes the phase information of two adjacent uplink spread spectrum codes according to a formula (15) to obtain the distance to be measured between the satellite and the ground control center,
in the formula (15), τ1Transmission delay, phi, caused by the distance between the satellite and the ground control center1For uplink spreading code phase accuracy value of uplink, phi2For converting the downlink spread spectrum code phase of the downlink into the uplink spread spectrum code phase and correcting the accurate value of the uplink spread spectrum code phase, fucIs the uplink spreading code rate, and c is the speed of light.
Preferably, the first array antenna and the first processing module are separately arranged on the satellite; and/or the presence of a gas in the gas,
the second array antenna and the second processing module are separately arranged in a ground control center;
the distance to be measured is the distance between the satellite and the ground control center.
Preferably, the first array antenna comprises:
the first transmitting module is used for transmitting a downlink spread spectrum signal which is synchronous with the phase information of the uplink spread spectrum signal based on a downlink;
the first receiving module is used for receiving an uplink spread spectrum signal sent by a second array antenna based on an uplink and sampling the uplink spread spectrum signal to obtain a baseband signal of the uplink spread spectrum signal;
the first processing module correlates a local reference spread spectrum signal built in the first processing module with a baseband signal of the uplink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain phase information of the uplink spread spectrum signal.
Preferably, the second array antenna includes:
a second transmitting module for transmitting an uplink spread spectrum signal synchronized with phase information of the downlink spread spectrum signal based on the uplink;
the second receiving module receives a downlink spread spectrum signal sent by the first array antenna based on a downlink, and samples the downlink spread spectrum signal to obtain a baseband signal of the downlink spread spectrum signal;
the second processing module correlates the local reference spread spectrum signal built in the second processing module with the baseband signal of the downlink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain the phase information of the downlink spread spectrum signal. .
Preferably, the wireless communication device further comprises a first reference module for providing a unified synchronous clock for the first transmitting module and the first receiving module, or a second reference module for providing a unified synchronous clock for the second transmitting module and the second receiving module.
A second aspect of the present invention relates to a non-coherent ranging method, comprising the steps of:
receiving, by a satellite, an uplink spread spectrum signal based on an uplink and sampling it; or, transmitting a downlink spread spectrum signal synchronized with phase information of the uplink spread spectrum signal based on a downlink;
the satellite processes the sampling signal of the uplink spread spectrum signal to obtain the phase information of the uplink spread spectrum signal;
the ground control center receives the downlink spread spectrum signal based on the downlink and samples the downlink spread spectrum signal; or, transmitting an uplink spread spectrum signal synchronized with phase information of the downlink spread spectrum signal based on the uplink;
the ground control center processes the sampling signal of the downlink spread spectrum signal to obtain the phase information of the downlink spread spectrum signal;
processing the phase information of two adjacent uplink spread spectrum codes according to a formula (15) to obtain the distance to be measured between the satellite and the ground control center,
in the formula (15), τ1Transmission delay, phi, caused by the distance between the satellite and the ground control center1For uplink spreading code phase accuracy value of uplink, phi2For converting the downlink spread spectrum code phase of the downlink into the uplink spread spectrum code phase and correcting the accurate value of the uplink spread spectrum code phase, fucIs the uplink spreading code rate, and c is the speed of light.
Preferably, the module for respectively transmitting and receiving spread spectrum signals on the satellite and the module for acquiring the phase information of the spread spectrum signals on the satellite are separately arranged on the satellite; and/or the presence of a gas in the gas,
the ground control center is provided with a module for respectively transmitting and receiving spread spectrum signals and a module for acquiring spread spectrum signal phase information on the ground control center which are separately arranged on the ground control center;
the distance to be measured is the distance between the satellite and the ground control center.
Preferably, the satellite transmits a downlink spread spectrum signal synchronized with phase information of an uplink spread spectrum signal based on a downlink; or the like, or, alternatively,
receiving an uplink spread spectrum signal sent by a ground control center based on an uplink, and acquiring the uplink spread spectrum signal;
and the satellite correlates the built-in local reference spread spectrum signal with the baseband signal of the uplink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain the phase information of the uplink spread spectrum signal.
Preferably, the ground control center transmits an uplink spread spectrum signal synchronized with phase information of a downlink spread spectrum signal based on an uplink; or receiving a downlink spread spectrum signal sent by a satellite based on a downlink, and sampling the downlink spread spectrum signal to obtain a baseband signal of the downlink spread spectrum signal;
and the ground control center correlates the built-in local reference spread spectrum signal with the baseband signal of the downlink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain the phase information of the downlink spread spectrum signal.
Preferably, the uplink spread spectrum signal received by the satellite and the downlink spread spectrum signal transmitted by the satellite have a unified synchronous clock, and the downlink spread spectrum signal received by the ground control center and the uplink spread spectrum signal transmitted by the ground control center have a unified synchronous clock.
The invention has the following beneficial effects:
the incoherent ranging system and the incoherent ranging method solve the contradiction between the traditional incoherent ranging mode and the digital array antenna, so that the digital array antenna technology can be applied to the incoherent ranging system, and meanwhile, the incoherent ranging system and the incoherent ranging method have the advantages of simplicity and convenience, easiness in engineering realization and the like, and have good engineering practical effects.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a non-coherent ranging system of the present invention;
fig. 2 is a flow chart of a non-coherent ranging method of the present invention.
Reference numerals:
1-a satellite;
11-a first array antenna;
111-a first receiving module;
112-a first transmitting module;
12-a first processing module;
13-a first reference module;
2-ground control center;
21-a second array antenna;
211-a second transmitting module;
212-a second receiving module;
22-a second processing module;
23-second reference module.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
A first aspect of the present invention relates to a ranging system, as shown in fig. 1, comprising:
at least one satellite 1, at least one ground control center 2. The satellite 1 comprises a first array antenna 11, a first processing module 12 and a first reference module 13; the ground control center 2 comprises a second array antenna 21, a second processing module 22 and a second reference module 23; the first array antenna comprises at least one first transmitting module 112 and at least one first receiving module 111; the second array antenna includes at least one second transmitting module 211 and at least one second receiving module 212.
A first transmitting module 112 of the satellite 1, configured to transmit a downlink spread spectrum signal; a first receiving module 111, configured to receive an uplink spread spectrum signal and complete a/D sampling; the first processing module 12 is configured to complete phase information extraction and incoherent distance measurement of an uplink spread spectrum signal; a first reference module 13, configured to provide a unified synchronous clock for the first transmitting module 112 and the first receiving module 111; a second transmitting module 211 of the ground control center 2, configured to transmit an uplink spread spectrum signal; a second receiving module 212, configured to receive the downlink spread spectrum signal and complete a/D sampling; the second processing module 22 is configured to complete phase information extraction and incoherent distance measurement of the downlink spread spectrum signal; and a second reference module 23, configured to provide a unified synchronous clock for the second transmitting module 211 and the second receiving module 212.
Wherein, the downlink spread spectrum signal transmitted by the first transmitting module 112 is as shown in equation (8),
y1(t)＝AP2(t-t0)cos[2πf2(t-t0)]
(8)
in the formula (8), A is the signal amplitude, P2(t) is a downlink spreading code, f2For downlink carrier frequency, t0Representing the clock difference between two ranging devices;
the uplink spread spectrum signal received by the first receiving module 111 is as shown in equation (2),
x2(t)＝AP1(t-τ1)cos[2πf1(t-τ1)]
(2)
in the formula (2), A is the signal amplitude, P1(t) is an uplink spreading code, f1Is an uplink carrier frequency; tau is1The transmission delay caused by the distance between the two distance measuring devices;
the first processing module 12 performs the correlation operation as shown in equation (4),
wherein, the uplink spread spectrum signal transmitted by the second transmitting module 211 is shown as formula (1),
x1(t)＝AP1(t)cos[2πf1(t)]
(1)
in the formula (1), A is the signal amplitude, P1(t) is an uplink spreading code, f1Is an uplink carrier frequency;
the downlink spread spectrum signal received by the second receiving module 212 is as shown in equation (9),
y2(t)＝AP2(t-t0-τ1)cos[2πf2(t-t0-τ1)]
(9)
in the formula (9), A is the signal amplitude, P2(t) is a downlink spreading code, f2For downlink carrier frequency, t0Representing the clock difference, tau, between two distance measuring devices1The transmission delay caused by the distance between the two distance measuring devices;
the second processing module 22 is configured to perform the correlation operation of equation (11),
a second aspect of the present invention relates to a non-coherent ranging method, as shown in fig. 2, which is applicable to ground navigation for multiple targets, and includes the steps of:
1. constructing the distance measuring system;
2. extracting uplink spread spectrum code phase information by the satellite;
the uplink spread spectrum signal sent by the second transmitting module 211 of the ground control center 2 is represented as:
x1(t)＝AP1(t)cos[2πf1(t)](1)
in the formula (1), A is the signal amplitude, P1(t) is an uplink spreading code, f1Is an uplink carrier frequency;
then, the uplink spread spectrum signal received by the first receiving module 111 of the satellite 1 can be represented as;
x2(t)＝AP1(t-τ1)cos[2πf1(t-τ1)](2)
in the formula (2), τ1The transmission delay caused by the distance between the two distance measuring devices;
the first receiving module 111 of the satellite 1 receives the uplink spread spectrum signal x2(t) A/D sampling to obtain baseband digital signal, sending to the first processing module 12, and mixing with a local reference spread spectrum signal x in the first processing module 123(t) performing a correlation operation. Local reference spread spectrum signal x3(t) can be expressed as:
x3(t)＝AP1(t-t0)cos[2πf1(t-t0)](3)
in the formula (3), t0Representing the clock difference between two ranging devices;
the signal correlation function is defined as:
depending on the nature of the correlation function, R (τ) is given by the above formula when τ is 0) Obtaining a maximum value; then x is2(t) and x3(t) correlating, which can be expressed as:
when τ is (t-t)0)-(t-τ1)＝τ1-t0Then R (τ) has a maximum value; then, the correlation function R of the discretized uplink signal after A/D samplingu(l) Can be expressed as:
Ru(l)＝[r(1),r(2),...,r(N)],l＝1,2,...,N (5)
in the formula (5), N is the total number of sampling points of the correlation function, and r (N) is the value of the nth point of the correlation function.
Let R beu(l) The position of the correlation peak at which the maximum occurs is r (k)1) Obtaining the corresponding sampling point count k1，1≤k1N is less than or equal to N. Because the sampling points are discrete, a discrete correction algorithm is required to be adopted to accurately correct the correlation peaks of the signals, and the measurement precision is further improved;
the algorithm is as follows: firstly, 1 sampling point is respectively taken from the left and the right of a correlation peak, namely a leading peak, a middle peak and a lagging peak, and corresponding counts are respectively k1-1、k1And k1+1, the amplitudes of the three samples are L (k)1-1)、L(k1) And L (k)1+1), the count value fine correction amount is:
obtaining the corrected uplink spread spectrum code phase precision value phi of the uplink1Comprises the following steps:
in the formula (7), fs1Sampling rate, f, of the uplink spread spectrum signal for satellite 1ucIs the uplink spread spectrum code rate;
3. ground control center extracting up-line spread spectrum code phase information
The second transmitting module 211 of the ground control center 2 transmits a downlink spread spectrum signal represented as:
y1(t)＝AP2(t-t0)cos[2πf2(t-t0)](8)
in the formula (8), A is the signal amplitude, P2(t) is a downlink spreading code, f2For downlink carrier frequency, t0Representing the clock difference between two ranging devices;
then, the downlink spread spectrum signal received by the ground control center 2 can be expressed as:
y2(t)＝AP2(t-t0-τ1)cos[2πf2(t-t0-τ1)](9)
in the formula (9), τ1The transmission delay caused by the distance between the two distance measuring devices;
the second receiving module 212 of the ground control center 2 receives the downlink spread spectrum signal y2(t) A/D sampling to form a baseband signal, sending the baseband signal to the second processing module 22, and combining the baseband signal with a local reference spread spectrum signal y in the second processing module 223(t) performing a correlation operation; local reference spread spectrum signal y3(t) can be expressed as:
y3(t)＝AP2(t)cos[2πf2(t)](10)
the signal correlation function is defined as:
according to the nature of the correlation function, R (τ) takes a maximum value when τ is 0; then will y2(t) and y3(t) correlating, which can be expressed as:
when t is t- (t-t)0-τ1)＝τ1+t0Then, R (τ) has a maximum value. Then discretized after A/D samplingCorrelation function R of downlink signald(l) Can be expressed as:
Rd(l)＝[r(1),r(2),...,r(N)],l＝1,2,...,N (12)
in the formula (12), N is the total number of sampling points of the correlation function, and r (N) is the value of the nth point of the correlation function. (ii) a
Let R bed(l) The position of the correlation peak at which the maximum occurs is r (k)2) Obtaining the corresponding sampling point count k2，1≤k2N is less than or equal to N. Because the sampling point is discrete, a discrete correction algorithm is needed to accurately correct the correlation peak of the signal, so that the measurement accuracy is further improved, and the algorithm is as follows: firstly, 1 sampling point is respectively taken from the left and the right of a correlation peak, namely a leading peak, a middle peak and a lagging peak, and corresponding counts are respectively k2-1、k2And k2+1, the amplitudes of the three samples are L (k)2-1)、L(k2) And L (k)2+1), the count value fine correction amount is:
because the transmitting signal module and the receiving signal module of the ground measuring equipment use the uniform synchronous clock provided by the reference module, the phase of the downlink spread spectrum code signal can be obtained by counting and converting the sampling point of the downlink signal, and the accurate value phi of the phase of the corrected uplink spread spectrum code is obtained2Comprises the following steps:
in the formula (14), fs2Sampling rate, f, of downlink spread spectrum signals for terrestrial ranging devicesucIs the uplink spread spectrum code rate;
4. performing non-coherent ranging
The distance R between the satellite and the ground control center can be obtained by processing the first uplink spread spectrum code phase information shown in formula (7) and the second uplink spread spectrum code phase information shown in formula (14):
in the formula (15), c represents the light velocity.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (7)
1. A non-coherent ranging system, comprising:
the first array antenna receives an uplink spread spectrum signal sent by the second array antenna based on an uplink and samples the uplink spread spectrum signal; or, transmitting a downlink spread spectrum signal synchronized with phase information of the uplink spread spectrum signal based on a downlink;
the first processing module is used for processing the sampling signal of the uplink spread spectrum signal to obtain the phase information of the uplink spread spectrum signal;
the second array antenna receives the downlink spread spectrum signals sent by the first array antenna based on the downlink and samples the downlink spread spectrum signals; or, transmitting an uplink spread spectrum signal synchronized with phase information of the downlink spread spectrum signal based on the uplink;
the second processing module is used for processing the sampling signal of the downlink spread spectrum signal to obtain the phase information of the downlink spread spectrum signal;
the distance measurement module processes the phase information of two adjacent uplink spread spectrum codes according to a formula (15) to obtain the distance to be measured between the satellite and the ground control center,
in the formula (15), τ1Transmission caused by distance between satellite and ground control centreDelay phi1For uplink spreading code phase accuracy value of uplink, phi2For converting the downlink spread spectrum code phase of the downlink into the uplink spread spectrum code phase and correcting the accurate value of the uplink spread spectrum code phase, fucIs the uplink spreading code rate, c is the speed of light;
the first array antenna includes:
the first transmitting module is used for transmitting a downlink spread spectrum signal which is synchronous with the phase information of the uplink spread spectrum signal based on a downlink;
the first receiving module is used for receiving an uplink spread spectrum signal sent by a second array antenna based on an uplink and sampling the uplink spread spectrum signal to obtain a baseband signal of the uplink spread spectrum signal;
the first processing module correlates a local reference spread spectrum signal built in the first processing module with a baseband signal of the uplink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain phase information of the uplink spread spectrum signal;
the second array antenna includes:
a second transmitting module for transmitting an uplink spread spectrum signal synchronized with phase information of the downlink spread spectrum signal based on the uplink;
the second receiving module receives a downlink spread spectrum signal sent by the first array antenna based on a downlink, and samples the downlink spread spectrum signal to obtain a baseband signal of the downlink spread spectrum signal;
the second processing module correlates the local reference spread spectrum signal built in the second processing module with the baseband signal of the downlink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain the phase information of the downlink spread spectrum signal.
2. The range finding system of claim 1, wherein the first array antenna and the first processing module are separately disposed on a satellite; and/or the presence of a gas in the gas,
the second array antenna and the second processing module are separately arranged in a ground control center;
the distance to be measured is the distance between the satellite and the ground control center.
3. The ranging system according to claim 1, further comprising a first reference module for providing a unified synchronous clock to the first transmitting module and the first receiving module, or a second reference module for providing a unified synchronous clock to the second transmitting module and the second receiving module.
4. A non-coherent ranging method, comprising the steps of:
a first array antenna in the satellite receives an uplink spread spectrum signal sent by a second array antenna in the ground control center based on an uplink, and samples the uplink spread spectrum signal;
a first processing module in the satellite correlates a local reference spread spectrum signal of the satellite with a sampling signal of the uplink spread spectrum signal to obtain a correlated sampling point, and corrects the correlated sampling point to obtain phase information of the uplink spread spectrum signal;
a first array antenna in the satellite transmits a downlink spread spectrum signal synchronized with phase information of an uplink spread spectrum signal based on a downlink;
a second array antenna in the ground control center receives downlink spread spectrum signals sent by a first array antenna in a satellite based on a downlink and samples the downlink spread spectrum signals;
a second processing module in the ground control center correlates the local reference spread spectrum signal with a sampled signal of the downlink spread spectrum signal obtained by sampling to obtain a correlated sampling point, and corrects the correlated sampling point to obtain phase information of the downlink spread spectrum signal;
a second array antenna in the ground control center transmits an uplink spread spectrum signal synchronized with phase information of the downlink spread spectrum signal based on the uplink;
processing the phase information of two adjacent uplink spread spectrum codes according to a formula (15) to obtain the distance to be measured between the satellite and the ground control center,
in the formula (15), τ1Transmission delay, phi, caused by the distance between the satellite and the ground control center1For uplink spreading code phase accuracy value of uplink, phi2For converting the downlink spread spectrum code phase of the downlink into the uplink spread spectrum code phase and correcting the accurate value of the uplink spread spectrum code phase, fucIs the uplink spreading code rate, and c is the speed of light.
5. The method of claim 4,
the first array antenna and the first processing module are separately arranged on the satellite; and/or the presence of a gas in the gas,
the second array antenna and the second processing module are separately arranged in a ground control center;
the distance to be measured is the distance between the satellite and the ground control center.
6. The method of claim 4, wherein the method further comprises the steps of: and carrying out clock synchronization on the transceiving of the first array antenna in the satellite.
7. The method of claim 4, wherein the method further comprises the steps of: and carrying out clock synchronization on the transceiving of the second array antenna in the ground control center.
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