CN111796306B - Navigation satellite signal receiving method and receiver - Google Patents
Navigation satellite signal receiving method and receiver Download PDFInfo
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- CN111796306B CN111796306B CN202010760469.0A CN202010760469A CN111796306B CN 111796306 B CN111796306 B CN 111796306B CN 202010760469 A CN202010760469 A CN 202010760469A CN 111796306 B CN111796306 B CN 111796306B
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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
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
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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
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
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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
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a navigation satellite signal receiving method and a receiver, which belong to the technical field of satellite navigation, in a matched filtering algorithm of a receiving method capturing step, a short-time correlation accumulation is carried out on a down-sampled satellite baseband signal and a PN code generated locally, and a short-time correlation accumulation result is stored in a memory with a set capacity; reading the related accumulated result from the memory to carry out FFT frequency sweep; carrying out incoherent accumulation and peak value judgment on the FFT sweep result, and capturing satellite signals; the short-time correlation accumulation adopts N paths of parallel short-time correlation accumulation of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase; the memory is used for storing and reading short-time related accumulated data based on address ordering and is used for realizing the ping-pong connection operation of storing the short-time related accumulated data and reading data by FFT sweep frequency. The invention can save double short-time related storage resources.
Description
Technical Field
The invention relates to the technical field of satellite navigation, in particular to a navigation satellite signal receiving method and a receiver.
Background
The Beidou satellite navigation system provides all-weather and real-time accurate position information, greatly improves efficiency and productivity in many industries, has important significance for economic development and national defense construction, and has wide application in civil and military fields. Among them, low unit cost of the receiver is a very important premise that satellite navigation is widely used. The resource of the implementation scheme of the Beidou navigation receiver is very important, and is an important index directly related to the cost of the receiver. Therefore, it is a very important technology to complete the capturing of the high dynamic signal under the condition of small computing resources.
Disclosure of Invention
In view of the above analysis, the present invention is directed to a navigation satellite signal receiving method and a receiver; the method is used for achieving the capturing of the high dynamic signal on the premise of small computing resources.
The invention discloses a navigation satellite signal receiving method, which comprises a capturing step; in the matched filtering algorithm of the capturing step, the method comprises the following steps:
short-time correlation accumulation is carried out on the down-sampled satellite baseband signals and locally generated PN codes, and short-time correlation accumulation results are stored in a memory with set capacity;
reading the related accumulated result from the memory to carry out FFT frequency sweep;
carrying out incoherent accumulation and peak value judgment on the FFT sweep result, and capturing satellite signals; wherein, the liquid crystal display device comprises a liquid crystal display device,
the short-time correlation accumulation adopts N paths of parallel short-time correlation accumulation of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase;
the memory is used for storing and reading short-time related accumulated data based on address ordering and is used for realizing the ping-pong connection operation of the short-time related accumulated data storage and FFT sweep frequency read data.
Further, the method for storing and reading out the short-time correlated accumulation data comprises the following steps:
storing the odd-number round related accumulated data in an address interval ordering storage mode; reading by adopting an address sequence ordering reading mode;
storing the even-number round related accumulated data by adopting an address sequence ordering storage mode, and reading by adopting an address interval ordering reading mode;
the address interval ordering storage mode is the same as the address interval ordering reading mode;
and releasing the storage space of the data immediately after the data of the previous round is read, so that the data of the next round can be stored.
Further, the specific address operation sequence of the address interval sequencing is as follows:
1,(M+1),(2M+1),...,M*(N-1)；
2,(M+2),(2M+2),...,M*(N-1)+1；
…
M,2M,3M,...,M*N。
further, the number of points of the FFT sweep satisfies the requirement of frequency search resolution.
Further, the frequency search resolution is based on the frequency mismatch loss of coherent integration
Determining; wherein omega IF Is the signal carrier frequency, ">
For the local carrier frequency, T is the coherent integration time.
Further, zero padding is carried out on short-time correlation accumulated samples of M points, so that the number of the samples of the sweep frequency meets the number of FFT sweep frequency points.
The invention also discloses a navigation satellite signal receiver applying the navigation satellite signal receiving method, which comprises a capturing module, wherein the capturing module comprises a memory with set capacity;
the acquisition module is used for carrying out short-time correlation accumulation on the down-sampled satellite baseband signals and the locally generated PN codes, and storing short-time correlation accumulation results into the memory;
reading the related accumulated result from the memory to carry out FFT frequency sweep;
carrying out incoherent accumulation and peak value judgment on the FFT sweep result, and capturing satellite signals; wherein, the liquid crystal display device comprises a liquid crystal display device,
the short-time correlation accumulation adopts N paths of parallel short-time correlation accumulation of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase;
the memory is used for storing and reading the relevant accumulated data based on address ordering and is used for realizing ping-pong connection operation of short-time relevant accumulated data storage and FFT sweep frequency read data.
Further, the capturing module also comprises a down-conversion module, a down-sampling storage module, a short-time correlation accumulation module, an FFT sweep frequency module, a noncoherent accumulation storage module and a peak threshold detection module;
the down-conversion module is used for down-converting intermediate frequency data of the satellite signals to obtain baseband signals of the satellite signals;
the down-sampling storage module is used for down-sampling the baseband signal and storing down-sampling data;
the short-time correlation accumulation module is used for reading out the down-sampling data, carrying out N paths of parallel short-time correlation accumulation of M points with the PN code generated locally, and storing the correlated accumulation data into the memory module;
the FFT frequency sweep module is used for carrying out FFT frequency sweep on the relevant accumulated data read out from the memory module in a set frequency sweep range;
the incoherent accumulation storage module is used for carrying out incoherent accumulation on the FFT sweep frequency result for a set number of times and storing the incoherent accumulation result;
and the peak threshold detection module is used for carrying out peak detection on the incoherent accumulation result to obtain a capturing result of the satellite signal.
Further, the memory module storing and reading method includes:
storing the odd-number round related accumulated data in an address interval ordering storage mode; reading by adopting an address sequence ordering reading mode;
storing the even-number round related accumulated data by adopting an address sequence ordering storage mode, and reading by adopting an address interval ordering reading mode;
the address interval ordering storage mode is the same as the address interval ordering reading mode;
and releasing the storage space of the data immediately after the data of the previous round is read, so that the data of the next round can be stored.
Further, the specific address operation sequence of the address interval sequencing is as follows:
1,(M+1),(2M+1),...,M*(N-1)；
2,(M+2),(2M+2),...,M*(N-1)+1；
…
M,2M,3M,...,M*N。
the beneficial effects of the invention are as follows:
the invention can save double short-time related storage resources. If the hardware resources are unchanged, the saved resources can be doubled more parallel channels because the short-time related storage is reduced to half of the original storage, so that the capturing speed can be doubled.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a flow chart of a guided matched filter algorithm in the first embodiment;
fig. 2 is a schematic diagram illustrating the connection of the capturing modules in the second embodiment.
Detailed Description
Preferred embodiments of the present invention are described in detail below with reference to the attached drawing figures, which form a part of the present application and, together with the embodiments of the present invention, serve to explain the principles of the invention.
Example 1
In this embodiment, the beidou navigation system is taken as an example to describe the reception of the B3 frequency point. The embodiment discloses a navigation satellite signal receiving method, in a matched filtering algorithm of a capturing step, as shown in fig. 1, specifically comprising the following steps:
s1, short-time correlation accumulation is carried out on a down-sampled satellite baseband signal and a locally generated PN code, and a short-time correlation accumulation result is stored in a memory with a set capacity;
s2, reading a relevant accumulation result from the memory to carry out FFT frequency sweep;
s3, carrying out incoherent accumulation and peak value judgment on the result of the FFT frequency sweep, and then capturing satellite signals;
in step S1, the short-time correlation accumulation uses parallel short-time correlation accumulation of N paths of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase;
the memory is used for storing and reading the relevant accumulated data based on address ordering and is used for realizing ping-pong connection operation of short-time relevant accumulated data storage and FFT sweep frequency read data.
Compared with the existing short-time correlation accumulated data storage method, the method can save one time of short-time correlation storage resources. Under the condition that hardware resources are unchanged, because the storage related to the short time is reduced to half of the original storage, the saved resources can be opened twice more parallel channels, so that the capturing speed can be doubled.
Specifically, the method for storing and reading out relevant accumulated data based on address ordering comprises the following steps:
storing the odd-number round related accumulated data in an address interval ordering storage mode; reading by adopting an address sequence ordering reading mode;
storing the even-number round related accumulated data by adopting an address sequence ordering storage mode, and reading by adopting an address interval ordering reading mode;
the address interval ordering storage mode is the same as the address interval ordering reading mode;
and releasing the storage space of the data immediately after the data of the previous round is read, so that the data of the next round can be stored.
More specifically, the specific address operation sequence of the address interval ordering is as follows:
1,(M+1),(2M+1),...,M*(N-1)；
2,(M+2),(2M+2),...,M*(N-1)+1；
…
M,2M,3M,...,M*N。
the order ordering specific address operation order is from 1 to M x N.
In this embodiment, taking 496-way 31-point parallel short-time correlation accumulation as an example, in the conventional scheme, a storage space of 496×31×2 is required to store parallel short-time correlation accumulation data, and in this embodiment, only 496×31 storage scale is required to complete the same function.
Specifically, the 496×31 relevant accumulated data of the first round are stored in an address interval ordering storage mode, and the data storage address operation sequence is as follows:
1,32,63...14881,2,33,64,...14882,...,30,61,92,...15376(496*31)。
after the first round of related accumulated data is stored, FFT sweep frequency processing reads the first round of related accumulated data from a memory to carry out sweep frequency operation; the reading process adopts an address sequence ordering reading mode, and related accumulated data is read by sequentially increasing storage address sequences from 1; and freeing up memory space for the data after it is read.
Storing the second round of related accumulated data into a memory while the first round of related accumulated data is read through FFT sweep frequency processing, wherein the storage mode is an address sequence ordering storage mode, namely, when the storage space of the first round of data is released in sequence, the second round of related accumulated data is stored in sequence;
after the second round of related accumulated data is stored, the FFT sweep frequency processing reads the second round of related accumulated data from the memory to carry out sweep frequency operation; the reading process reads according to the address interval sequencing reading mode, and releases the storage space of the data after the data is read; the address interval ordering and reading mode is the same as the address interval ordering and storing mode of the first round of address interval ordering and storing mode;
storing third-round correlated accumulation data into a memory while FFT sweep frequency processing reads second-round correlated accumulation data, wherein the storage mode is the same as the first-round address interval ordering storage mode, namely storing third-round correlated accumulation number in a release space while releasing the storage space of the second-round data;
the reading of the third round of data is the same as the reading of the first round of data, the storage and the reading of the fourth round of data are the same as the storage and the reading of the second round of data, and similarly, the FFT sweep frequency is carried out on the storage and the reading of the parallel short-time correlated accumulation data.
Because the Beidou navigation satellite signals processed by the embodiment are high-dynamic signals, the dynamic of the high-dynamic signals can reach 500m/s under the airborne condition, and the dynamic of the high-dynamic signals can reach 3000m/s or even higher under the missile-borne condition, the Doppler frequency is included in the captured satellite signals unlike quasi-static reception under the walking or vehicle-mounted condition.
Because the Doppler frequency of the high dynamic receiving signal is obtained by expanding the frequency sweep range of the FFT in the traditional matched filtering algorithm, the frequency sweep range of the FFT is expanded, the data volume of the subsequent incoherent accumulation can be greatly increased, more calculation resources are needed, and the power consumption, the volume and the cost of the receiver are increased.
Therefore, the present embodiment adopts a limited-width FFT-in sweep range to perform the FFT sweep. In this way, the real satellite signal Doppler frequency falling in the FFT sweep range can be obtained through the FFT sweep, and when the Doppler frequency exceeds the FFT sweep range, namely under sampling, the Doppler frequency can fall in the FFT sweep range after folding according to the sampling law.
In the tracking channel establishment of the tracking step, a double tracking channel is established, the captured Doppler frequency and the frequency after the Doppler frequency is subjected to deconvolution are tracked respectively, the signal-to-noise ratio estimation is performed on the tracking results of the two channels, and a channel signal with high signal-to-noise ratio is selected as the tracking output signal.
Specifically, in the matched filter algorithm, the sampling rate of intermediate frequency data is 62MHz, the capturing is 1ms coherent integration time, and 8 times of incoherent accumulation are performed. The specific process of the matched filtering algorithm comprises the following steps:
1) Down-converting intermediate frequency data of the satellite signals to obtain baseband signals of the satellite signals;
2) The baseband signal is subjected to low-pass filtering and then downsampled to 15.5MHz and stored in a RAM for subsequent acquisition processing;
3) The downsampled data is read out from the RAM, and is subjected to 500-point short-time correlation with a locally generated PN code, so that a short-time correlation signal with the signal frequency fs=15.5 MHz/500=31 KHz is obtained;
4) Setting the FFT sweep frequency range to be +/-15.5 KHz, and carrying out FFT sweep frequency on the signals after short-time correlation;
5) Performing incoherent accumulation for set times on the FFT sweep frequency result;
6) And carrying out peak detection on the incoherent accumulation result to obtain a satellite signal capturing result and obtain the Doppler frequency fa of the satellite signal.
Specifically, in step 4), the number of points of the FFT sweep is required to meet the requirement of the frequency search resolution.
According to the basic principle of capturing the GNSS line-of-sight signals, the GNSS line-of-sight signal model is as follows:
where A is the amplitude of the signal, c (t) is the pseudo-code signal, d (t) is the data signal, ω IF Is the carrier frequency of the signal,
is the signal carrier phase, n (t) is the channel noise; assuming that the coherent integration operation does not span the bit edge in the capturing process, the captured signal, i.e. the local signal pseudo code and the local carrier, are correlated and accumulated with the zenith signal, and the correlation integral value is:
where c (t- τ) is the local pseudocode, τ is the time difference between the local pseudocode and the period of the zenith signal pseudocode,
for the local carrier frequency, < >>
For locally estimating carrier phase, T is coherent integration time, and the signal part after coherent integration operation is
Wherein;
as can be seen from equation (4), the main factors affecting the coherent integration energy are:
the greater the signal strength, the greater the coherent integration output energy;
the longer the coherent integration time, the greater the coherent integration output energy;
the local pseudocode is out of phase with the received signal pseudocode. The smaller the phase difference, the greater the energy of the output signal.
Deviation between the local carrier and signal doppler. The smaller the deviation between the two, the greater the energy of the output signal.
For frequency mismatch loss, the frequency deviation is1/(t.2) integral energy loss 3.9db. The integrated energy loss is 0.91db when the frequency deviation is 1/(T4). />
Thus, the frequency search resolution of the present embodiment is based on the frequency mismatch loss of the coherent integration
Determining; the frequency search resolution is set to 1/(t×4). The coherent integration time T is 1ms and the frequency search resolution is 250Hz.
The FFT sweep range of this example is + -fs/2, + -15.5 khz. The data of 1ms is 31 samples, in order to meet the frequency search interval, the number of the FFT sweep frequency is the power of 2, and the zero is filled into the samples by a zero filling method, so that the number of the samples meets the number of the FFT sweep frequency.
Specifically, 97 0 s are supplemented, 128-point FFT is performed for frequency sweep, and the frequency sweep interval is 243Hz. Less than 250Hz of frequency search resolution, and meets the requirements.
One phase of incoherent accumulation in step 5) requires 128 bins of stored data. The sampling frequency of the down-sampled signal is 15.5MHz, the pseudo code period of 1ms of the B3 frequency point is 15500 phases in total, and the data number of 15500x128 is required to be stored in total.
More specifically, in a Beidou satellite system, the maximum Doppler caused by satellite motion is 5kHz. The motion speed of the Beidou receiving carrier is higher and higher, and can reach two or three kilometers per second or more.
When the carrier motion is 2500m/s of high dynamic state, the Doppler caused by the receiver motion is 10kHz, and the maximum Doppler caused by the satellite motion is 5kHz, the maximum Doppler of the satellite signal can reach 15kHz. The range of the FFT sweep frequency of the embodiment is selected to be +/-15.5 khz, so that the signal capture under the high dynamic state is satisfied.
In summary, the embodiment can save twice the short-time related storage resources. If the hardware resources are unchanged, the saved resources can be doubled more than the number of parallel channels because the short-time related storage is reduced to half of the original storage, and the capture speed can be doubled.
Example two
The embodiment discloses a high dynamic navigation satellite signal receiver, in a capturing module of the receiver, short-time correlation accumulation is carried out on a down-sampled satellite baseband signal and a locally generated PN code, and a short-time correlation accumulation result is stored in a memory with a set capacity;
reading the related accumulated result from the memory to carry out FFT frequency sweep;
carrying out incoherent accumulation and peak value judgment on the FFT sweep result, and capturing satellite signals;
the short-time correlation accumulation adopts N paths of parallel short-time correlation accumulation of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase;
the memory is used for storing and reading the relevant accumulated data based on address ordering and is used for realizing ping-pong connection operation of short-time relevant accumulated data storage and FFT sweep frequency read data.
Specifically, as shown in fig. 2, the capturing module includes a down-conversion module, a down-sampling storage module, a short-time correlation accumulation module, a memory module, an FFT sweep frequency module, a non-coherent accumulation storage module and a peak threshold detection module;
the down-conversion module is used for down-converting intermediate frequency data of the satellite signals to obtain baseband signals of the satellite signals;
the down-sampling storage module is used for down-sampling the baseband signal to 15.5MHz and storing down-sampling data;
the short-time correlation accumulation module is used for reading out the down-sampling data and performing 496-way 31-point parallel short-time correlation accumulation with a locally generated PN code;
the memory module is used for storing and reading the relevant accumulated data and realizing ping-pong connection operation of short-time relevant accumulation and FFT sweep frequency;
the FFT sweep frequency module is used for carrying out FFT sweep frequency on the relevant accumulated data read out from the memory module within a set sweep frequency range of +/-15.5 khz;
the incoherent accumulation storage module is used for carrying out incoherent accumulation on the FFT sweep frequency result for a set number of times and storing the incoherent accumulation result;
and the peak threshold detection module is used for carrying out peak detection on the incoherent accumulation result to obtain a capturing result of the satellite signal.
More specifically, the memory module storing and reading method includes:
storing the odd-number round related accumulated data in an address interval ordering storage mode; reading by adopting an address sequence ordering reading mode;
the address operation sequence of the address interval ordering storage mode is as follows: 1,32,63.. 14881,2,33,64, 14882, wherein the first and second components, 30,61,92..15376 (496 x 31);
storing the even-number round related accumulated data by adopting an address sequence ordering storage mode, and reading by adopting an address interval ordering reading mode;
the address operation sequence of the address interval sequencing reading mode is the same as that of the address interval sequencing storing mode;
and releasing the storage space of the data immediately after the data of the previous round is read, so that the data of the next round can be stored.
Other technical details and advantageous technical effects in this embodiment are the same as those in the first embodiment, and will not be described in detail here.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. A navigation satellite signal receiving method, comprising a capturing step; in the matched filtering algorithm of the capturing step, the method comprises the following steps:
short-time correlation accumulation is carried out on the down-sampled satellite baseband signals and locally generated PN codes, and short-time correlation accumulation results are stored in a memory with set capacity;
reading the related accumulated result from the memory to carry out FFT frequency sweep;
carrying out incoherent accumulation and peak value judgment on the FFT sweep result, and capturing satellite signals; wherein, the liquid crystal display device comprises a liquid crystal display device,
the short-time correlation accumulation adopts N paths of parallel short-time correlation accumulation of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase;
the memory is used for storing and reading short-time related accumulated data based on address ordering and realizing ping-pong connection operation of the short-time related accumulated data and FFT sweep frequency read data;
the storage and readout method of the short-time correlated accumulation data comprises the following steps:
storing the odd-number round related accumulated data in an address interval ordering storage mode; reading by adopting an address sequence ordering reading mode;
storing the even-number round related accumulated data by adopting an address sequence ordering storage mode, and reading by adopting an address interval ordering reading mode;
the address interval ordering storage mode is the same as the address interval ordering reading mode;
and releasing the storage space of the data immediately after the data of the previous round is read, so that the data of the next round can be stored.
2. The method for receiving navigation satellite signals according to claim 1, wherein,
the specific address operation sequence of the address interval sequencing is as follows:
1,(M+1),(2M+1),...,M*(N-1)；
2,(M+2),(2M+2),...,M*(N-1)+1；
…；
M,2M,3M,...,M*N。
3. the method for receiving navigation satellite signals according to claim 1, wherein,
the number of the FFT sweep frequency points meets the requirement of frequency searching resolution.
4. A navigation satellite signal receiving method according to claim 3, wherein the frequency search resolution is lost according to frequency mismatch of coherent integration
Determining; wherein omega IF Is the signal carrier frequency, ">
For the local carrier frequency, T is the coherent integration time.
5. The navigation satellite signal receiving method according to claim 3, wherein zero padding is performed on short-time correlated accumulation samples of M points, so that the number of samples of the sweep frequency satisfies the number of FFT sweep frequency points.
6. A navigation satellite signal receiver applying the navigation satellite signal receiving method according to any one of claims 1-5, comprising a acquisition module, said acquisition module comprising a memory of set capacity;
the acquisition module is used for carrying out short-time correlation accumulation on the down-sampled satellite baseband signals and the locally generated PN codes, and storing short-time correlation accumulation results into the memory;
reading the related accumulated result from the memory to carry out FFT frequency sweep;
carrying out incoherent accumulation and peak value judgment on the FFT sweep result, and capturing satellite signals; wherein, the liquid crystal display device comprises a liquid crystal display device,
the short-time correlation accumulation adopts N paths of parallel short-time correlation accumulation of M points; the set capacity of the memory is M x N, and M is the sample number obtained by PN code short-time correlation accumulation of one phase;
the memory is used for storing and reading the relevant accumulated data based on address ordering and is used for realizing ping-pong connection operation of short-time relevant accumulated data storage and FFT sweep frequency read data.
7. The navigation satellite signal receiver of claim 6, wherein the acquisition module further comprises a down-conversion module, a down-sampling storage module, a short-time correlation accumulation module, an FFT sweep module, a non-coherent accumulation storage module, and a peak threshold detection module;
the down-conversion module is used for down-converting intermediate frequency data of the satellite signals to obtain baseband signals of the satellite signals;
the down-sampling storage module is used for down-sampling the baseband signal and storing down-sampling data;
the short-time correlation accumulation module is used for reading out the down-sampling data, carrying out N paths of parallel short-time correlation accumulation of M points with the PN code generated locally, and storing the correlated accumulation data into the memory module;
the FFT frequency sweep module is used for carrying out FFT frequency sweep on the relevant accumulated data read out from the memory module in a set frequency sweep range;
the incoherent accumulation storage module is used for carrying out incoherent accumulation on the FFT sweep frequency result for a set number of times and storing the incoherent accumulation result;
and the peak threshold detection module is used for carrying out peak detection on the incoherent accumulation result to obtain a capturing result of the satellite signal.
8. The navigation satellite signal receiver of claim 7, wherein said memory module storing and reading method comprises:
storing the odd-number round related accumulated data in an address interval ordering storage mode; reading by adopting an address sequence ordering reading mode;
storing the even-number round related accumulated data by adopting an address sequence ordering storage mode, and reading by adopting an address interval ordering reading mode;
the address interval ordering storage mode is the same as the address interval ordering reading mode;
and releasing the storage space of the data immediately after the data of the previous round is read, so that the data of the next round can be stored.
9. The navigation satellite signal receiver of claim 8, wherein,
the specific address operation sequence of the address interval sequencing is as follows:
1,(M+1),(2M+1),...,M*(N-1)；2,(M+2),(2M+2),...,M*(N-1)+1；…；
M,2M,3M,...,M*N。
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| CN113406608B (en) * | 2021-06-17 | 2023-08-15 | 北京航空航天大学 | Air target detection device based on DVB-S forward scattering characteristics |
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