CN117792852A - Ranging signal construction method for communication radiation source network radar - Google Patents
Ranging signal construction method for communication radiation source network radar Download PDFInfo
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Abstract
The invention relates to a ranging signal construction method for a communication radiation source network radar, which comprises the steps of ranging code generation, ranging code mapping into modulation symbols, filling of the modulation symbols into a 5G frame structure and ranging signal generation. The ranging codes are pseudo-random codes with good auto-correlation and cross-correlation properties, one ranging code is required for each transmitting base station. The ranging signal is in the form of: completing the transmission of the ranging code in one subcarrier in a plurality of frames or subframes, arranging according to a certain sequence, transmitting a complete ranging code, and then circularly transmitting the ranging code for infinite times according to the mode; the transmission of the ranging code may also be accomplished in multiple frames or multiple subcarriers in a subframe. The invention adopts a set of shared hardware equipment to realize radar detection and communication transmission, and the radar equipment is smaller and lighter, thereby improving portability and applicability.
Description
Technical Field
The invention belongs to the technical field of communication radiation source network radars, and particularly relates to a construction method for a ranging signal in a communication radiation source network radar.
Background
A conventional radar system is a device that uses radio waves for detection and measurement, and may be used to determine the direction, distance, or speed of a target. Conventional radars are widely applied in many fields, but have the problems of high transmitting power and large equipment size.
Firstly, the transmitting power is high: the transmission power of conventional radars is usually large, which can lead to large electromagnetic leakage, for example, the pulse power of a general remote warning radar is in the order of hundreds of kilowatts to megawatts, and the pulse power of a medium and near fire radar is in the order of hundreds of kilowatts to hundreds of kilowatts.
Secondly, the equipment is large in volume: conventional radar devices are typically bulky, which limits their use to some extent in certain environments (e.g., urban environments).
Based on a communication radiation source network of a widely-distributed communication base station, a ranging signal can be constructed by introducing a ranging code, so that the integration of communication and target perception is realized, and no special radar equipment is needed.
Ranging code is a binary pseudo-random code widely used in satellite navigation technology to determine the distance from a satellite to a receiver while distinguishing between different satellite signals. The ranging code migration is applied to the communication radiation source network radar, so that the path length of the ranging signal of the transmitting base station reflected by the target to the receiving base station can be measured, and the target position can be further calculated.
Disclosure of Invention
In order to enable signals sent by a communication radiation source to have a ranging function, a ranging code is introduced, and a construction method of ranging signals in a communication radiation source network radar is provided.
The technical scheme adopted for solving the technical problems is as follows:
a construction method of ranging signals in a communication radiation source network radar comprises the following steps:
step 1, ranging code generation
Ranging codes in the communication radiation source network radar are generated by the base station circuit. The ranging code is a special pseudo-random code, and is mainly used for distance measurement and signal identification in wireless communication, such as m-sequence, gold code and the like.
Step 2, the ranging code is mapped into modulation symbols
In an OFDM system, a distance measuring code is mapped to a frequency domain through a mapper of a communication radiation source network radar and is distributed on frequency domain spaces corresponding to different subcarriers, so that multi-carrier communication is realized. The ranging code sequence is mapped to obtain modulation symbols, for example, binary phase shift keying is adopted to obtain BPSK symbols.
Step 3, filling modulation symbols into 5G frame structure
And filling the modulation symbols into the same sub-carrier of a plurality of frames to obtain the 5GNR ranging frame structure.
Step 4, ranging signal generation
And the transmitting base station performs inverse fast Fourier transform, adds CP and performs parallel-serial conversion on the 5G NR ranging frame structure to obtain a ranging signal of the communication radiation source network radar.
In the method for constructing ranging signals in the communication radiation source network radar, the modulation symbols in the step 3 are filled in a 5G frame structure, and the modulation symbols can be filled in a plurality of subcarriers of one frame beyond CA K [m]And 0 is filled in the position of the frame to obtain a 5G NR ranging frame structure.
In the method for constructing ranging signals in the communication radiation source network radar, the modulation symbols in the step 3 are filled in a 5G frame structure, and the modulation symbols can be filled in a plurality of sub-carriers of one sub-frame beyond CA K [m]And 0 is filled in the position of the frame to obtain a 5G NR ranging frame structure.
In the method for constructing ranging signals in the communication radiation source network radar, the modulation symbols in the step 3 are filled into the 5G frame structure, and the modulation symbols can be filled into a plurality of subcarriers of a time slot beyond CA K [m]And 0 is filled in the position of the frame to obtain a 5G NR ranging frame structure.
The method for constructing ranging signals in the communication radiation source network radar, wherein the step 4 of generating the ranging signals further comprises the following steps:
the 5G NR ranging frame structure is a series of time slot matrixes, each time slot matrix element represents a modulation symbol, a row represents the number of subcarrier frequencies, and a column represents the number of OFDM symbol duration. And performing IFFT operation on each column of the matrix, converting the frequency into a time domain to obtain a time domain waveform, adding a CP (cyclic redundancy check) on each time domain waveform, and performing parallel-serial conversion to sequentially splice the OFDM symbols with the CPs from head to tail in sequence to form a baseband signal of a complete time slot. After DAC conversion, the baseband signal is loaded on the high-frequency carrier wave and becomes a radio-frequency signal to generate a ranging signal.
The above construction method of ranging signal in communication radiation source network radar, the pseudo random code selected as ranging code needs to have the following characteristics:
high autocorrelation: the autocorrelation function of the ranging code is close to zero at other delay values than zero delay. This means that the ranging code can perform correlation operation with the original transmitting code at the receiving end, so as to realize accurate positioning and distance measurement of the signal.
Low cross-correlation: the cross-correlation function between the ranging codes is close to zero. This allows simultaneous transmission of different ranging codes on the same frequency band without interference between each other.
Long periodicity: ranging codes may provide code sequences long enough to meet distance measurement and signal identification requirements. The beneficial effects of the invention are as follows:
a construction method of ranging signals in a communication radiation source network radar can reduce the transmitting power: in a typical communication base station, the transmitting power of a GSM base station is generally 20W-60W, the transmitting power of a power amplifier in a 5G millimeter wave base station is generally about 2W, and the radiating power of a urban base station is generally 30W-300W.
A construction method of ranging signals in a communication radiation source network radar integrates and miniaturizes: the radar detection and communication transmission are realized through a set of shared hardware equipment, so that the radar equipment is smaller and lighter, and the portability and applicability of the radar equipment are improved.
The construction method of the ranging signal in the communication radiation source network radar can reduce the cost: the number of equipment to be purchased and maintained is reduced, and the overall operating cost is reduced.
Drawings
FIG. 1 is a block diagram of a transmitter of a communication radiation source network radar in a 5G NR system;
FIG. 2 is a schematic diagram of a gold code generation circuit;
fig. 3 is a schematic diagram of a 5G NR frame structure.
Detailed Description
Example 1
Ranging codes require the selection of Pseudo-random codes (Pseudo-Noise codes) with good auto-and cross-correlation properties, for example, m-sequences (maximum length linear shift register sequences) and Gold codes (Gold codes) are widely used Pseudo-random codes. The m sequence is superior to the gold code in the autocorrelation performance, the gold code is superior to the m sequence in the cross correlation performance, and the selection of which ranging code depends on specific application requirements, for example, when the communication radiation source network nodes are fewer, the mutual interference among the transmitting base stations is smaller, and the m sequence is suitable to be selected as the ranging code; and more network nodes, gold codes are selected in the occasion of obvious cross-correlation interference.
In the embodiment, gold codes are selected as ranging codes, each transmitting base station corresponds to a specific gold code and is used as the identity code of the base station, so that the receiving base station can effectively identify ranging signals sent by different base stations. A 5G base station based on orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is selected as a multicarrier modulation scheme for the communication radiation source. The parameter set (Numerology) of 5 GNRs determines the signal parameters of 5G communications. The embodiment uses a parameter set μ=1, at which the subcarrier spacing (Subcarrier Spacing, SCS) Δf=30 kHz, the Slot (Slot) length is 0.5ms.
Communication radiation source network radar in a 5G NR system, a transmitter block diagram is shown in fig. 1, in which QAM (Quadrature Amplitude Modulation) denotes quadrature amplitude modulation, PSK (Phase Shift Keying) denotes phase shift keying, IFFT (Inverse Fast Fourier Transform) denotes inverse fast fourier transform, CP (Cyclic Prefix) denotes cyclic prefix, and DAC (Digital to Analog Converter) denotes digital-analog converter.
The ranging signal of the communication radiation source network radar corresponds to the output of the radio frequency emission in fig. 1, and the construction process mainly comprises the steps of generating gold codes, mapping the gold codes into modulation symbols, filling the modulation symbols into a 5G frame structure and realizing the ranging signal.
The method comprises the following specific steps:
step 1, generating gold codes in communication radiation source network radar
As shown in FIG. 2, the gold code generating circuit is provided with two groups of equal-length shift registers with feedback, each group comprises k 1bit registers, shift occurs along with clock, and the shift direction is right. When resetting, the initial value of the register group is controlled by the initial phase control logic, the two shift registers are respectively input by the second mode sum of the specific registers to generate feedback values, and the value of the rightmost register is output. The output of the two groups of shift registers is two m sequences, which are marked as a G1 sequence and a G2 sequence, and the two sequences are subjected to modulo two sum to obtain gold codes.
The number K of single-sided registers represents the order of the gold code, and the generated gold code period k=2 k -1. For example, under the condition of the order k=10, the initial value of the register set of the fixed G1 sequence is all '1', by changing the initial phase of the G2 sequence, 1023 gold codes with the period of 1023 chips and the autocorrelation function R can be generated i,i And cross-correlation function R i,j Peak value of (2):
where τ is the chip offset in the correlation operation.
Step 2, gold code mapping in communication radiation source network radar is modulation symbol
When the order k=10, the number of chips k=1023 included in one gold code period is mapped to the frequency domain by a mapper inside the communication radiation source network radar, so as to obtain 1023 modulation symbols. Binary phase shift keying (Binary Phase Shift Keying, BPSK) mapping is used as shown in table 1.
TABLE 1 BPSK mapping relationship
| Source code | Modulation symbol |
| 0 | M·e i·0 |
| 1 | M·e i·π |
Where M represents the signal amplitude, the set range depends on the transmit power limit of the base station device.
Step 3, filling modulation symbols in the communication radiation source network radar into a 5G frame structure
Fig. 3 is a schematic diagram of a 5GNR frame structure used in the present invention, where a block in the diagram represents a Resource Element (RE), which occupies one subcarrier in the frequency domain and occupies one symbol length in the time domain.
In the frequency domain, the number of subcarriers used in the embodiment is n=3276, 410 virtual carriers with upward and downward applied frequencies are taken as the frequency domain guard interval, and N is summed up t =4096 carriers, subcarrier index n corresponds to frequency
In the time domain, 14 OFDM symbols constitute one slot, 2 slots constitute one subframe, and 10 subframes constitute one frame.
CA order K [m]And representing the modulation symbol mapped by the gold code with the period of K chips, wherein m is an index. When k=1023, a single-period modulation symbol needs to occupy about 74 REs.
To achieve integration of communication and radar perception, except CA for radar perception K [m]In addition to the modulation symbols, there are also resources that the modulation symbols used for communication occupy the 5G frame structure. The filling pattern of the radar-aware modulation symbol filling frame structure depends on how many free subcarrier resources are available after the communication occupies the resources. The filling pattern of the modulation symbols for radar sensing occupying different numbers of subcarriers of the frame structure is as follows:
1) The radar sensing modulation symbols are filled into one same Subcarrier (Subcarrier) of a plurality of frames (Radio frames), and the transmission is repeated;
table 2 frame Structure filling schematic (Pattern 1)
Representing the mth modulation symbol in the nth slot.
2) Radar-aware modulation symbols are padded into multiple subcarriers of one frame (20 slots), beyond CA K [1023]Is filled with 0 and repeatedly transmitted;
TABLE 3 frame structure filling schematic diagram (Pattern 2)
3) Radar-aware modulation symbols are padded into multiple subcarriers of one subframe (2 slots) beyond CA K [1023]Is filled with 0 and repeated.
TABLE 4 frame structure filling schematic diagram (Pattern 3)
4) The radar-aware modulation symbols are padded into multiple subcarriers of one slot (slot) beyond CA K [1023]Is filled with 0 and repeated.
TABLE 5 frame structure filling schematic diagram (Pattern 4)
Step 4, realization of ranging signal generation in communication radiation source network radar
After the 5G frame structure is filled with modulation symbols for communication and radar sensing, respectively, adding virtual carrier as frequency guard interval, generating a 4096×14 time slot matrix, each matrix element representing a modulation symbol, 4096 rows representing 4096 subcarrier frequencies, and 14 columns representing 14 OFDM symbol durations. And performing IFFT operation on each column of the matrix, converting the frequency into the time domain, obtaining 14 time domain waveforms with the length of 1 OFDM symbol time, adding CP (cyclic redundancy check), and performing parallel-serial conversion on each time domain waveform to splice the 14 CP-added OFDM symbols end to-end in sequence into a baseband signal of a complete time slot. After DAC conversion, the baseband signal is loaded on the high-frequency carrier wave to become a radio-frequency signal, and a final ranging signal is generated.
Claims (6)
1. A ranging signal construction method for a communication radiation source network radar, comprising the steps of:
step 1, ranging code generation:
ranging codes in the communication radiation source network radar are generated by a base station circuit, and the ranging codes are mutually orthogonal pseudo-random codes;
step 2, the ranging code is mapped into modulation symbols:
in an OFDM system, a distance measuring code is mapped to a frequency domain through a mapper of a communication radiation source network radar to obtain modulation symbols, and the modulation symbols are arranged on frequency domain spaces corresponding to different subcarriers, so that multi-carrier communication is realized;
step 3, the modulation symbol is filled into a 5G frame structure:
filling the modulation symbols into the same sub-carrier of a plurality of frames to obtain a 5GNR ranging frame structure;
step 4, ranging signal generation:
and the transmitting base station performs inverse fast Fourier transform, CP (CP) addition, parallel-to-serial conversion and digital-to-analog conversion on the 5G NR ranging frame structure to obtain a ranging signal of the communication radiation source network radar.
2. The method for constructing ranging signal for communication radiation source network radar according to claim 1, wherein the modulation symbols of step 3 are filled into 5G frame structure, and the modulation symbols can be filled into a plurality of sub-carriers of one frame beyond CA K [m]And 0 is filled in the position of the frame to obtain a 5GNR ranging frame structure.
3. The method for constructing ranging signal for communication radiation source network radar according to claim 1, wherein the modulation symbols of step 3 are filled into 5G frame structure, and the modulation symbols can be filled into a plurality of sub-carriers of one sub-frame beyond CA K [m]And 0 is filled in the position of the frame to obtain a 5G NR ranging frame structure.
4. The method for constructing ranging signal for communication radiation source network radar according to claim 1, wherein the modulation symbols of step 3 are filled into 5G frame structure, and the modulation symbols can be filled into a plurality of sub-carriers of one slot beyond CA K [m]And 0 is filled in the position of the frame to obtain a 5G NR ranging frame structure.
5. The method for constructing ranging signals for a communication radiation source network radar according to any one of claims 1 to 4, wherein in said step 4 ranging signal generation, further comprising:
the 5G NR ranging frame structure is a series of time slot matrixes, matrix elements of each time slot matrix represent one modulation symbol, rows represent the number of subcarrier frequencies, and columns represent the number of OFDM symbol duration; performing IFFT operation on each column of the time matrix, converting the frequency into time domain to obtain time domain waveforms, after each time domain waveform is added with CP,
after parallel-serial conversion, the OFDM symbols with the CPs are spliced end to end in sequence to form a baseband signal of a complete time slot; after DAC conversion, the baseband signal is loaded on the high-frequency carrier wave and becomes a radio-frequency signal to generate a ranging signal.
6. The method for constructing ranging signals for a communication radiation source network radar according to claim 5, wherein each transmitting base station corresponds to a specific ranging code as an identity code of the base station, and it is ensured that the receiving base station can effectively recognize ranging signals transmitted from different base stations.
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