CN102185628A - Spread spectrum code phase capture equipment based on adaptive power accumulation and capture method thereof - Google Patents
Spread spectrum code phase capture equipment based on adaptive power accumulation and capture method thereof Download PDFInfo
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Abstract
The invention provides spread spectrum code phase capture equipment based on adaptive power accumulation and a capture method thereof. The capture equipment comprises an accumulation frequency and threshold selector, a serial/parallel connection conversion circuit, an accumulator group and a channel noise estimator; a receiver processes a received signal so as to obtain a signal power value; the signal power value is input into an accumulator through the serial/parallel connection conversion circuit and accumulated; a noise frequency is obtained from the signal power value by the channel noise estimator; the accumulation frequency and threshold selector set a present accumulation frequency and a threshold value; and values accumulated by the accumulators are input into the threshold selector and compared with one another so as to obtain a spread spectrum code phase. By the capture method based on the capture equipment, the signal power values are accumulated so that the accumulation frequency and the threshold value can be adjusted dynamically, and the accumulated values are compared with the threshold value so as to obtain the spread spectrum code phase. By the invention, aims of smoothing a noise and improving the capture performance can be fulfilled; the false-alarm probability and the detection probability can be kept constant basically under different signal to noise ratio conditions; and the capture time is short.
Description
Technical field
The invention belongs to wireless communication field, relate to a kind of spread spectrum code acquisition technology of radio spread spectrum communication, be specifically related to a kind of spreading code phase capturing device and catching method thereof that is applied to radio spread spectrum communication based on the adaptive power accumulation.
Background technology
Spread spectrum technic becomes broadband signal after being meant certain specific spread spectrum functional expansion of spectrum utilization with information to be transmitted, sends in the channel and transmits, and utilizes corresponding means with its compression and extract the means of communication of transmission information again.
Spread spectrum has good in anti-interference performance, signal is difficult for being identified and catch, anti-multipath decline ability is strong, be easy to realize advantage such as multiple access communication, being widely used at present in the middle of military communication and the 3rd third-generation mobile communication, is one of technology of contemporary wireless communication field hot topic.
Spread spectrum communication system mainly is made up of spread spectrum transmitter and band spread receiver.Hereinafter, abbreviate spread spectrum transmitter as transmitter, abbreviate band spread receiver as receiver.Transmitter at first generates spread-spectrum signal with raw information by modulating a pseudo noise code, and launches by radio-frequency front-end.In spread spectrum communication, this pseudo noise code is called spreading code.Receiver then utilizes same spreading code that the spread-spectrum signal that receives is carried out demodulation, recovers raw information.
At receiver the spread-spectrum signal that receives is separated timing, its precondition is the spread-spectrum signal that receives need be aimed on phase place with the spreading code that is produced by receiver.Yet, the spread-spectrum signal that transmitter sends via wireless channel after, will produce a random delay, promptly phase place will be no longer definite.Therefore, receiver at first needed to catch the spreading code phase place of this signal, otherwise can't carry out the recovery of raw information before the spread-spectrum signal that receives is carried out demodulation.Therefore, guarantee the stable and efficient communication of spread spectrum communication system, must guarantee earlier that the spreading code phase place catches fast and correctly.
The autocorrelation performance that mainly is based on pseudo noise code of catching of spreading code phase place carries out.Concrete grammar is: produce a series of spreading codes with out of phase by receiver, carry out demodulation respectively to received signal and export a signal.When this signal level during greater than a certain threshold value, the phase place that can judge this moment is the phase place of the spread-spectrum signal that receives of receiver.But the existence owing to noise can not guarantee that 100% spreading code phase place is correctly caught, and be easy to produce false-alarm, thereby capture time can't be guaranteed, is unfavorable for the application of spread spectrum technic in systems such as burst communication.
Summary of the invention
The present invention is directed in the spreading code phase capturing of spread spectrum communication system, catch problem inaccurate and that capture time can't guarantee, proposed a kind of spreading code phase capturing device and catching method thereof based on the adaptive power accumulation because of affected by noise.
A kind of spreading code phase capturing device based on the adaptive power accumulation comprises: carrier wave demodulation device, matched filter, square-law detector, threshold compataror, series/parallel change-over circuit, one group of accumulator, interchannel noise estimator and accumulation number of times and thresholding selector.Described carrier wave demodulation device carries out carrier wave demodulation to the signal that receiver receives, and the signal behind the carrier wave demodulation is with the chip period T of spreading code
cImport successively for step-length and to carry out coherent detection in the matched filter; Described matched filter is with chip period T
cFor the signal after the step-length output detection is given square-law detector; Described square-law detector carries out square-law detection picked up signal performance number to the signal of input, and the signal power value exported respectively is given to series/parallel change-over circuit and interchannel noise estimator; Described series/parallel change-over circuit is changed the signal power value of input, and the signal power value of the different chip period in the symbol period is input in the different accumulators successively; Described interchannel noise estimator utilizes the signal power value to carry out the noise power estimation and obtains noise power, and with noise power input accumulation number of times and thresholding selector; Described accumulation number of times and thresholding selector are determined current accumulation number of times and current threshold value according to the noise power of input, and current accumulation number of times is exported to each accumulator, and current threshold value is exported to threshold compataror; The current threshold value that described threshold compataror is received is set to the threshold value of self; Each accumulator is after the adding up of the signal power value of finishing cumulative frequency, successively with in the signal power value input threshold comparator that adds up, make comparisons with the threshold value of threshold compataror, if the signal power value that certain accumulator adds up is higher than this threshold value, then threshold compataror is exported the sequence number of this accumulator as the spreading code phase place.
A kind of spreading code phase capturing method based on the adaptive power accumulation comprises following 6 steps:
Step 1:, obtain and be stored in pairing accumulation number of times and threshold value under the different signal to noise ratios according to of the requirement of actual spread spectrum communication system to false-alarm and detection probability.
Step 2: will be used for L all zero clearing of accumulator of power accumulation.
Step 3: receiver carries out following processing to the signal in the symbol period that receives, and obtains L signal power value; Carry out carrier wave demodulation at first to the received signal, signal behind the carrier wave demodulation is that step-length is carried out coherent detection by matched filter successively with the chip period of spreading code then, matched filter serves as the signal of exporting at interval after handling with the chip period of each spreading code also, signal to matched filter output carries out square-law detection at last, obtains L signal power value.Described symbol period is the chip period of the length * spreading code of spreading code.
Step 4: L signal power value done the processing of two aspects:
On the one hand, with L signal power value input string/parallel switching circuit, the series/parallel change-over circuit is sent the signal power value of different chip period into the operation that adds up in the different accumulators successively;
On the other hand, L signal power value input channel noise estimator carried out noise power to be estimated, obtain noise power, with noise power input accumulation number of times and thresholding selector, accumulation number of times and thresholding selector are provided with current accumulation number of times and current threshold value, and current accumulation number of times exported to each accumulator, and current threshold value is exported to threshold compataror, the just current threshold value of threshold compataror is set to the threshold value of self.
Step 5: judge whether each accumulator has finished the operation that adds up of current accumulation number of times,, change step 3 and carry out that if finish, then execution in step 7 if do not have.
Step 6: with the value in L the accumulator export to successively in the threshold compataror with threshold compataror in the threshold value contrast, if the value in certain accumulator is higher than this threshold value, then with the phase information output of the sequence number of this accumulator as spreading code.
Advantage of the present invention and good effect are:
(1) the present invention can be according to the convenient design of the requirement spreading code phase capturing device to false alarm probability and detection probability, and simplicity of design is easy to use;
(2) the present invention introduces one group of power accumulator after traditional spread spectrum code acquisition device based on matched filter, can smoothly fall noise, reduces false alarm probability, and has improved acquisition probability;
(3) the present invention is by introducing interchannel noise estimator and accumulation number of times and thresholding selector, adaptive mechanism is provided, in conjunction with power accumulation and adaptive control, make it under different signal to noise ratio conditions, dynamically adjust power accumulation number of times, and then reduction mean acquisition time, and keep false alarm probability and acquisition probability constant substantially, improved acquisition performance.
Description of drawings
Fig. 1 is the modular structure schematic diagram of spreading code phase capturing device of the present invention;
Fig. 2 is the flow chart of steps of spreading code phase capturing method of the present invention;
Fig. 3 is the specific implementation schematic diagram of interchannel noise estimator among Fig. 1;
Fig. 4 is the schematic diagram of power accumulation to the smoothing effect of noise;
Fig. 5 is the detection probability curve comparison diagram of the inventive method and CFAR method;
Fig. 6 is the false alarm probability curve comparison diagram of the inventive method and CFAR method;
Fig. 7 is the mean acquisition time curve comparison diagram that the inventive method, CFAR method and multiple-symbol add up and select big method.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
In the concrete implementation of the present invention, it is the spreading code of L that transmitter adopts length, and a chip period of spreading code is T
c
Spreading code phase capturing device based on the adaptive power accumulation of the present invention, as shown in Figure 1, comprise the carrier wave demodulation device 1 that is used for carrier wave demodulation, be used to carry out the matched filter 2 of coherent detection, be used to obtain the square-law detector 3 of matched filter output signal power, series/parallel change-over circuit 4, be used to carry out a group of power accumulation and have accumulator 5 with the number of the equal in length of spreading code, be used for noise power estimated channel noise estimator 6 and store accumulation number of times under the different signal to noise ratios and accumulation number of times and the thresholding selector 7 and the threshold compataror 8 of thresholding.
Receiver will carry out carrier wave demodulation in the signal incoming carrier demodulator 1 that receive, and the signal behind the carrier wave demodulation is with chip period T
cFor carrying out coherent detection in the step-length input matched filter 2.Matched filter 2 is also with T
cFor the signal after the step-length output detection is given square-law detector 3.The signal of 3 pairs of inputs of square-law detector carries out the performance number of square-law detection picked up signal, and square-law detector 3 sends to series/parallel change-over circuit 4 and interchannel noise estimator 6 respectively with the signal power value.The signal power value of 4 pairs of inputs of series/parallel change-over circuit is changed, and the signal power value of the different chip period in the symbol period is input in the different accumulator 5.Interchannel noise estimator 6 utilizes the signal power value to carry out the noise power estimation and obtains noise power, and with noise power input accumulation number of times and thresholding selector 7.The accumulation number of times is exported to each accumulator 5 according to the noise power of input with corresponding cumulative frequency with thresholding selector 7, and threshold value is exported to threshold compataror 8.The threshold value that threshold compataror 8 is received is set to the threshold value of self.Each accumulator 5 is after the adding up of the signal power value of finishing cumulative frequency, successively with in the signal power value input threshold comparator 8 that adds up, make comparisons with the threshold value of threshold compataror 8, if the signal power value that adds up in certain accumulator 5 is higher than threshold value, then threshold compataror 8 is with the sequence number output of this accumulator 5, and the sequence number of this accumulator 5 is exactly a spreading code phase place to be determined.
Described interchannel noise estimator 6 is done remaining signal power value on average after maximum in L the signal power value that an obtains value is rejected, and obtains noise power.
Described accumulation number of times and thresholding selector 7, accumulation number of times under the signal to noise ratio of the noise power that first symbol period can be obtained selection correspondence and threshold value are as current accumulation number of times and current threshold value; Also can obtain accumulation number of times K and threshold value V under the corresponding signal to noise ratio according to the noise power in current sign cycle
T, with accumulation number of times K and the current accumulation number of times K ' comparison that obtains, if K≤K ', it is K that current accumulation number of times K ' then is set, and current threshold value V is set
T' be V
T, if K＞K ' then keeps current accumulation number of times K ' and current threshold value V
T' value constant, initial current accumulation number of times K ' and current threshold value V
T' be set to infinity.
Describe spreading code phase capturing method provided by the invention in detail below in conjunction with Fig. 1 and Fig. 2.
Step 1: according to application scenarios to the spread spectrum code acquisition performance demands, promptly to false alarm probability P
FaWith detection probability P
dRestriction, calculate to obtain accumulation number of times and threshold value under different signal to noise ratio conditions, and it be stored in the accumulation number of times and thresholding selector 7 among Fig. 1.Wherein, accumulation number of times K and threshold value V
TCan calculate by following formula respectively and obtain:
Wherein, E
CL/N
OThe expression signal to noise ratio, N
OThe expression noise power spectral density, T
cA chip period of expression spreading code, E
cThe energy of a chip of expression spreading code, L represents the length of spreading code, last Q
K(x, y) the Marcum function on expression K rank.
Step 2: with one group L accumulator 5 zero clearings shown in Figure 1.
Step 3: will receive a symbol period LT
cInterior signal at first carries out carrier wave demodulation by carrier wave demodulation device 1, and the signal behind the carrier wave demodulation is with T
cImport matched filter 2 successively for step-length and carry out coherent detection.Matched filter 2 also will be with step-length T
cSignal after output detects, and in the input square-law detector 3 with the performance number of picked up signal.
Step 4: the signal power value of step 3 acquisition is done the processing of two aspects:
On the one hand, signal power is referred to input string/parallel switching circuit 4.The signal power value that obtains is L, by series/parallel change-over circuit 4 the signal power value of different chip period is imported the operation that adds up in the different accumulators 5 successively.L accumulator 5 arranged, L signal power value in the just in time corresponding symbol period in the accumulator group.
On the other hand, the signal power value input channel noise estimator 6 that step 3 obtains is carried out the noise power estimation, current accumulation number of times and current threshold value are set.
Interchannel noise estimator 6 receives L signal power value altogether in a symbol period, this L signal power value carried out the noise power estimation approach as shown in Figure 3.Because this L signal power value is that other all is performance numbers of noise the performance number of the signal that will transmit except one, therefore, at first a value of maximum is rejected, because it most possibly is the performance number of the signal that will transmit.Then remaining performance number is done on average, obtained noise power
Accumulate number of times and thresholding selector 7 at last according to the noise power that obtains, obtain corresponding signal to noise ratio, from memory, choose corresponding cumulative frequency K and threshold value V by map addresses according to corresponding signal to noise ratio
TDescribed signal to noise ratio equals signal power divided by noise power, and signal power can be provided by the other parts of receiver, is known in the spreading code phase capturing.Described noise power
Account form be:
Wherein, the signal power value that A (n) expression is exported behind square-law detector 3 square-law detections, the maximum of A (I) expression square law wave detector 3 in L the signal power value of exporting in a symbol period, n represents the sequence number that square-law detector 3 is exported each time.
Accumulation number of times and the current accumulation number of times of thresholding selector 7 last outputs are exported current threshold value and are given threshold compataror 8 to the accumulator group, and threshold value was set to the threshold value of self before threshold compataror 8 deserved.
The method to set up of accumulation number of times and 7 pairs of current accumulation number of times of thresholding selector and current threshold value has following dual mode:
(1) L signal power value of first symbol period of obtaining by step 3 carried out noise power and estimate, obtain noise power, and then obtain accumulation number of times K and threshold value V under the corresponding signal to noise ratio
TAfter, current accumulation number of times K ' is fixedly installed into this accumulation number of times K, with current threshold value V
T' fixedly install and be this threshold value V
T
(2) L the signal power value in current sign cycle of obtaining by step 3 carried out noise power and estimate, obtain noise power, and then obtain accumulation number of times K and threshold value V under the corresponding signal to noise ratio
T, with accumulation number of times K and the current accumulation number of times K ' comparison that obtains, if K≤K ', then upgrading current accumulation number of times K ' is K, upgrades current threshold value V
T' be V
T, if K＞K ' then keeps current accumulation number of times K ' and current threshold value V
T' value constant; Initial current accumulation number of times K ' and current threshold value V
T' be set to infinity.
Step 5: judge whether each accumulator finishes the operation that adds up of accumulation number of times, if not, then change step 3 and carry out, if then carry out next step.
Step 6: export the accumulated value in L the accumulator to threshold compataror 8 successively, and with threshold compataror 8 in threshold value contrast, if the accumulated value in certain accumulator is higher than threshold value, then with the phase information output of the sequence number of this accumulator as spreading code.
As shown in Figure 4, reflected the benefit that the set power accumulation of the present invention is brought intuitively.Among the figure, abscissa is represented phase place (unit is a chip), and ordinate is represented signal power (unit be watt), is 1 in signal amplitude, and noise power is 6 o'clock, does not carry out the power accumulation and through the effect comparison after 10 power accumulation.When not carrying out the power accumulation, the output when matched filter 2 is complementary is submerged in the noise, thereby can't obtain phase information.And after accumulating through 10 power, noise has obtained smoothly, can see the extreme value that occurs phase place among Fig. 4, and this promptly represents the phase information that will obtain.
Fig. 5 and Fig. 6 have contrasted CFAR method (CFAR) and the performance curve of method of the present invention on detection probability and false alarm probability.Wherein CFAR method constant false alarm rate gets 10
-3, the inventive method requires false alarm probability less than 10
-3, detection probability is greater than 0.95, and the accumulation number of times changes between 1 to 10 time.From Fig. 5 and Fig. 6, can obtain to draw a conclusion:
1) the inventive method can make detection probability still remain on more than 0.95 under low signal-to-noise ratio, and the CFAR method descends rapidly along with the reduction detection probability of signal to noise ratio.The false alarm probability of the inventive method all can remain on 10 under different signal to noise ratios
-3Below, and 10
-3And change in oscillation between 0.Therefore the inventive method is better than the CFAR method comprehensively on false alarm probability and detection probability.
2) there are certain fluctuation in detection probability of the inventive method and false alarm probability on the requirement index, and this is because the discreteness of accumulation number of times causes.But fluctuation range is 10
-3Below.
Contrasted Fig. 7 method of the present invention and CFAR method and multiple-symbol add up and select the difference of big method on mean acquisition time (unit is a chip), and having reflected needs what chips ability acquisition phase.As known in the figure, no matter how many signal to noise ratios is, method of the present invention all can obtain minimum capture time.
As can be seen, the present invention has realized smooth noise, has improved the purpose of acquisition performance from Fig. 4 to Fig. 7, can make false alarm probability and detection probability keep substantially constant under different signal to noise ratio conditions simultaneously, thereby has short capture time.
Claims (10)
1. spreading code phase capturing device based on adaptive power accumulation, comprise: carrier wave demodulation device, matched filter, square-law detector and threshold compataror, it is characterized in that described spreading code phase capturing device also comprises: the series/parallel change-over circuit, be used to carry out one group of accumulator, the interchannel noise estimator of power accumulation and store accumulation number of times under the different signal to noise ratios and the accumulation number of times and the thresholding selector of thresholding;
Described carrier wave demodulation device carries out carrier wave demodulation to the signal that receiver receives, and the signal behind the carrier wave demodulation is with the chip period T of spreading code
cImport successively for step-length and to carry out coherent detection in the matched filter; Described matched filter is with chip period T
cFor the signal after the step-length output detection is given square-law detector; Described square-law detector carries out square-law detection picked up signal performance number to the signal of input, and the signal power value exported respectively is given to series/parallel change-over circuit and interchannel noise estimator; Described series/parallel change-over circuit is changed the signal power value of input, and the signal power value of the different chip period in the symbol period is input in the different accumulators successively; Described interchannel noise estimator utilizes the signal power value to carry out the noise power estimation and obtains noise power, and with noise power input accumulation number of times and thresholding selector; Described accumulation number of times and thresholding selector are determined current accumulation number of times and current threshold value according to the noise power of input, and current accumulation number of times is exported to each accumulator, and current threshold value is exported to threshold compataror; The current threshold value that described threshold compataror is received is set to the threshold value of self; Each accumulator is after the adding up of the signal power value of finishing cumulative frequency, successively with in the signal power value input threshold comparator that adds up, make comparisons with the threshold value of threshold compataror, if the signal power value that certain accumulator adds up is higher than this threshold value, then threshold compataror is exported the sequence number of this accumulator as the spreading code phase place.
2. a kind of spreading code phase capturing device based on adaptive power accumulation according to claim 1 is characterized in that, described one group of accumulator has the accumulator with the length L equal number of spreading code.
3. a kind of spreading code phase capturing device of stating according to claim 1 based on adaptive power accumulation, it is characterized in that described interchannel noise estimator is after maximum in L the signal power value that obtains a value rejecting, remaining signal power value is done on average, obtained noise power.
4. a kind of spreading code phase capturing device according to claim 1 based on the adaptive power accumulation, it is characterized in that, described accumulation number of times and thresholding selector, the noise power that first symbol period is obtained select accumulation number of times under the corresponding signal to noise ratio and threshold value as current accumulation number of times and current threshold value.
5. a kind of spreading code phase capturing device according to claim 1 based on the adaptive power accumulation, it is characterized in that, described accumulation number of times and thresholding selector obtain accumulation number of times K and threshold value V under the corresponding signal to noise ratio according to the noise power in current sign cycle
T, with accumulation number of times K and the current accumulation number of times K ' comparison that obtains, if K≤K ', it is K that current accumulation number of times K ' then is set, and current threshold value V is set
T' be V
TIf K＞K ' then keeps current accumulation number of times K ' and current threshold value V
T' value constant; Initial current accumulation number of times K ' and current threshold value V
T' be set to infinity.
6. the spreading code phase capturing method based on the adaptive power accumulation is characterized in that, specifically may further comprise the steps:
Step 1:, obtain and be stored in pairing accumulation number of times and threshold value under the different signal to noise ratios according to of the requirement of actual spread spectrum communication system to false-alarm and detection probability;
Step 2: will be used for L all zero clearing of accumulator of power accumulation, L equals the length of spreading code;
Step 3: receiver carries out following processing to the signal in the symbol period that receives, obtain L signal power value: carry out carrier wave demodulation at first to the received signal, signal behind the carrier wave demodulation is that step-length is carried out coherent detection by matched filter successively with the chip period of spreading code then, matched filter serves as the signal of exporting at interval after handling with the chip period of each spreading code also, signal to matched filter output carries out square-law detection at last, obtains L signal power value;
Step 4: L signal power value done the processing of following two aspects:
On the one hand, with L signal power value input string/parallel switching circuit, the series/parallel change-over circuit is sent the signal power value of different chip period into the operation that adds up in the different accumulators successively;
On the other hand, L signal power value input channel noise estimator carried out noise power to be estimated, obtain noise power, with noise power input accumulation number of times and thresholding selector, accumulation number of times and thresholding selector are provided with current accumulation number of times and current threshold value, and current accumulation number of times exported to each accumulator, and current threshold value is exported to threshold compataror, threshold value was set to the threshold value of self before threshold compataror deserved;
Step 5: judge whether each accumulator has finished the operation that adds up of current accumulation number of times,, change step 3 and carry out,, then carry out next step if finish if do not have;
Step 6: export in the threshold compataror value in L the accumulator to threshold compataror threshold value contrast successively, if be higher than this threshold value, then with the phase place output of the sequence number of this accumulator as spreading code.
7. a kind of spreading code phase capturing method based on the adaptive power accumulation according to claim 6 is characterized in that, accumulation number of times described in the step 1 and threshold value specifically obtain by following two formulas:
Wherein, P
FaThe expression false alarm probability, P
dThe expression detection probability, K represents to accumulate number of times, V
TThe expression threshold value, N
OThe expression noise power spectral density, T
cThe chip period of expression spreading code, E
cThe energy of a chip of expression spreading code, L represents the length of spreading code, Q
K(x, y) the Marcum function on expression K rank.
8. a kind of spreading code phase capturing method based on the adaptive power accumulation according to claim 6 is characterized in that the symbol period described in the step 3 is the chip period of the length * spreading code of spreading code.
9. a kind of spreading code phase capturing method according to claim 6 based on the adaptive power accumulation, it is characterized in that, step 44 is described carries out noise power with L signal power value input channel noise estimator and estimates, specifically: at first the maximum in L the signal power value is rejected, then L-1 remaining signal power value done and on average obtained noise power, the formula that is adopted is:
Wherein, the signal power value of A (n) expression behind square-law detection, A (I) is illustrated in the maximum in L the interior signal power value of a symbol period.
10. a kind of spreading code phase capturing method based on the adaptive power accumulation according to claim 6 is characterized in that accumulation number of times described in the step 4 and thresholding selector are provided with current accumulation number of times and current threshold value, and two kinds of methods are specifically arranged:
First kind: accumulation number of times and threshold value under the signal to noise ratio of the noise power correspondence of first symbol period that will obtain by step 3, fixedly installing is current accumulation number of times K ' and current threshold value V
T';
Second kind: to accumulation number of times K and the threshold value V under the signal to noise ratio of the noise power correspondence in current sign cycle of obtaining by step 3
T, with accumulation number of times K and the current accumulation number of times K ' comparison that obtains, if K≤K ', then upgrading current accumulation number of times K ' is the current threshold value V of K
T' be V
TIf K＞K ' then keeps current accumulation number of times K ' and current threshold value V
T' value constant; Initial current accumulation number of times K ' and current threshold value V
T' be set to infinity.
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| CN103888167A (en) * | 2012-12-19 | 2014-06-25 | 西安合众思壮导航技术有限公司 | Signal acquisition method, device thereof and equipment with device |
| CN109150235A (en) * | 2017-06-28 | 2019-01-04 | 南京理工大学 | Compressed sensing based multicycle direct expansion msk signal two dimension joint acquisition method |
| CN110954879A (en) * | 2019-12-02 | 2020-04-03 | 北京无线电测量研究所 | Digital detection method and system for moving threshold |
| CN113225102A (en) * | 2021-04-13 | 2021-08-06 | 南京理工大学 | Low signal-to-noise ratio code capturing method based on random continuous phase modulation signal |
| CN113225102B (en) * | 2021-04-13 | 2022-09-06 | 南京理工大学 | Low signal-to-noise ratio code capturing method based on random continuous phase modulation signal |
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