CN116699506A - Short-range radio navigation system ranging beacon response signal generating device - Google Patents
Short-range radio navigation system ranging beacon response signal generating device Download PDFInfo
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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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/04—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
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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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
- G01S1/04—Details
- G01S1/042—Transmitters
- G01S1/0428—Signal details
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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
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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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
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Abstract
The invention discloses a device for generating a response signal of a ranging beacon of a short-range radio navigation system, which relates to the ranging field of the short-range radio navigation system. The spread spectrum modulation unit multiplies the pseudo-random sequence with the ranging baseband pulse pair signal to generate a pulse pair spread spectrum modulation signal; the identification code loading unit multiplies the identification code by the pulse pair spread spectrum modulation signal to generate an identification code loading signal. According to the technical scheme disclosed by the invention, the working efficiency and the ranging accuracy of the ranging of the short-range radio navigation system are improved, and meanwhile, the reliability of the ranging is also improved.
Description
Technical Field
The invention relates to the field of ranging of a short-range radio navigation system, in particular to a device for generating a response signal of a ranging beacon of the short-range radio navigation system.
Background
Since ancient times, people have used navigation inadvertently to accomplish some of the activities. In the history of development, navigation technology has been continuously explored, and the application of the navigation technology is also extended and expanded to various fields. Along with the continuous development of navigation technology, especially the development of radio navigation technology, the application fields of the navigation technology are also expanding, such as guiding airplanes, ships, unmanned vehicles, carrier rockets and the like to navigate along a pre-designated route; guiding the aircraft to take off and land; guiding the ship through narrow channels and entering and exiting the estuary, berthing the dock and other tasks.
In 1919, the first airlines in the world were born, and from there, the airplanes had the role of transportation and travel. Aircraft is an important topic as a means of transportation and travel. At night, and in low visibility situations, safe landing of aircraft is also becoming increasingly important. Aviation is the most important to ensure the safety and no accident in the whole flight process. As a main guiding information source for flight operations, the navigation system must ensure that the navigation information has a very high degree of reliability. Ranging devices (Distance Measuring Equipment, DME) used by radio navigation systems play an important role in the overall composition of short-range radio navigation systems; the safe landing guidance is realized by matching with the angle measurement system and providing the position information of the aircraft relative to the approach guidance point in real time.
In the prior art, when the short-range radio navigation system performs ranging, the response signal transmitted by the ground beacon response signal generating device includes a beacon identification signal and a ranging pulse signal. The beacon identification signal is used for identifying a ground beacon by the aerial platform, and the ranging pulse signal is used for measuring the transmission time between the aerial platform and the ground beacon, so that the distance measurement is realized.
However, in the prior art, the identification signal and the ranging signal sent by the ground beacon response signal generating device are sent in a time-sharing manner, and in a serial manner, the ground beacon identification and the ranging can only be carried out in a time-sharing manner, that is, the ranging can not be carried out during the identification, so that the short-range radio navigation system has long ranging time and low working efficiency, which is one of the bottlenecks that it is difficult to improve the working capacity of the short-range radio navigation system. In the prior art, ranging is achieved by capturing the rising edge of a ranging pulse, and the slow rising edge characteristic of the adopted bell-shaped ranging pulse can lead to low ranging precision and cannot meet the requirement of high-precision ranging. Further, in the prior art, the identification signal sent by the ground beacon response signal generating device is a conventional amplitude modulation signal, and in the channel transmission process, the identification signal is easy to be interfered, has weak anti-interference capability, and is difficult to ensure the ranging reliability of the short-range radio navigation system.
Therefore, how to improve the working efficiency and the ranging accuracy of the ranging of the short-range radio navigation system and improve the reliability of the ranging at the same time is a difficult problem to be solved in the ranging field of the existing short-range radio navigation system.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a short-range radio navigation system ranging beacon response signal generating device, which is used for improving the working efficiency and the ranging accuracy of the short-range radio navigation system ranging and improving the ranging reliability.
The technical scheme is as follows: to achieve the above object, a short-range radio navigation system ranging beacon response signal generating apparatus of the present invention. The device comprises a timing unit, a ranging baseband pulse pair generating unit, a pseudo-random sequence generating unit, a spread spectrum modulating unit, a beacon identification code generating unit, an identification code loading unit, a cosine carrier generating unit, a carrier modulating unit and a radio frequency unit;
the timing unit is used for generating a timing signal and outputting the timing signal to the ranging baseband pulse pair generating unit;
the ranging baseband pulse pair generating unit generates a repetition period ofT s Ranging baseband pulse pair signal [δ(t)+δ(t-θ pulse )]And output to the spread spectrum modulation unit, wherein,δ(t) For the ranging baseband pulse waveform,θ pulse the interval time of two pulses in the ranging baseband pulse pair is set;
the pseudo-random sequence generating unit is used for generating a pseudo-random sequence with good autocorrelation characteristics and outputting the pseudo-random sequence to the spread spectrum modulating unit;
the spread spectrum modulation unit respectively compares each chip amplitude of the pseudo random sequence with the ranging baseband pulse pair signal according to the chip sequence from low to high of the pseudo random sequenceδ(t)+δ(t-θ pulse )]Multiplying to generate a pulse pair spread spectrum modulation signal and outputting the signal to the identification code loading unit;
the beacon identification code generating unit is used for generating a beacon identification code sequence and outputting the beacon identification code sequence to the identification code loading unit;
the identification code loading unit multiplies each chip amplitude of the beacon identification code sequence by the pulse pair spread spectrum modulation signal according to the chip sequence from low to high of the beacon identification code sequence to generate an identification code loading signal, and outputs the identification code loading signal to the carrier modulation unit;
the cosine carrier generating unit is used for generating a cosine carrier signalcos2πftAnd output to the carrier modulation unit;
the carrier modulation unit is used for loading the identification code with the cosine carrier signalcos2πftMultiplying to generate a carrier modulation signal and outputting the carrier modulation signal to the radio frequency unit;
the radio frequency unit is used for amplifying and filtering the power of the carrier modulation signal and then transmitting the carrier modulation signal to an antenna for radiation.
Further, in the technical scheme disclosed in the present invention, the carrier modulation signal generated by the carrier modulation unit is:
，
wherein ,d j for the number of chipsMBeacon identification code sequence [d 1 ,d 2 ,d 3 ,…,d j , …,d M ]Is the first of (2)jThe amplitude of the individual chips is determined,β k for the number of chipsNPseudo-random sequence of [β 1 ,β 2 ,β 3 ,…,β k , …,β N ]Is the first of (2)kThe amplitude of the individual chips is determined,δ(t)for the ranging baseband pulse waveform,θ pulse for the interval time of two pulses in the ranging baseband pulse pair,T s repeating a cycle time for the radio navigation system ranging beacon reply signal.
Further, in the technical scheme disclosed in the invention, the ranging baseband pulse waveformδ(t)Is a gaussian pulse.
Further, in the technical scheme disclosed by the invention, the pseudo-random sequence generated by the pseudo-random sequence generating unit has good autocorrelation property and is an M sequence.
Further, in the technical scheme disclosed by the invention, the beacon identification code sequence generated by the beacon identification code generation unit consists of an 18-bit bipolar binary identification code sequence, and is used for distinguishing the beacon addresses; each chip time length of the bipolar binary identification code sequence is equal to a sum of all chip time lengths of the pseudo-random sequence.
Further, in the technical solution disclosed in the present invention, the timing unit is configured to generate a timing signal and output the timing signal to the ranging baseband pulse pair generating unit, where the timing signal includes an interval time signal of the ranging baseband pulse pairθ pulse And repeating cycle time signal of said ranging baseband pulse pairT s 。
Further, the cosine carrier signalcos2πftIs operated in the microwave L band.
Further, the cosine carrier generating unit has an X mode and a Y mode, and generates a cosine carrier signal when operating in the X modecos2πftThe carrier frequency working range of the antenna is 962 MHz-1024 MHz and 1151 MHz-1213 MHz; when operating in Y mode, the generated cosine carrier waveSignal signalcos2πftThe carrier frequency operating range of (a) is 1025MHz to 1150MHz.
Compared with the prior art, the invention has the following beneficial effects:
(1) Facilitating improved measurement efficiency for short-range radio navigation systems
In the prior art, the identification signal and the ranging signal sent by the short-range radio navigation system ground beacon response signal generating device are sent in a time-sharing way, and the ground beacon identification and the ranging can only be carried out in a time-sharing way by adopting a serial way, namely, the ranging can not be carried out during the identification, so that the short-range radio navigation system has long ranging time and low working efficiency, and is one of the bottlenecks that the working capacity of the short-range radio navigation system is difficult to improve.
In the technical scheme disclosed by the invention, a spread spectrum modulation unit of the ground beacon response signal generating device spreads and modulates the pseudo random sequence generated by the pseudo random sequence generating unit and the ranging baseband pulse pair generated by the ranging baseband pulse pair generating unit to form a pulse pair spread spectrum modulation signal for ranging; the identification code loading unit multiplies the identification code sequence generated by the beacon identification code generating unit with the pulse to spread spectrum modulation signal according to the chip sequence to realize identification code loading; finally forming a response signal through the carrier modulation unit; the response signal comprises pulse pair signals for ranging and identification codes for identifying the beacon stations, namely the response signal can simultaneously transmit ranging pulse signals and identification code signals and is realized in a parallel mode, so that the identification and ranging time is shortened.
Compared with the prior art, the technical scheme disclosed by the invention is beneficial to improving the measurement efficiency of the short-range radio navigation system, thereby being beneficial to improving the working capacity of the system.
(2) Facilitating improved ranging accuracy for short-range radio navigation systems
In the prior art, short range radio navigation system ranging is achieved by capturing the rising edge of the ranging pulse, while the bell-shaped ranging pulse is employed, which is slowThe rising edge characteristics of (2) may result in low ranging accuracy and failure to meet the high-accuracy ranging requirement. In the disclosed solution, the ranging pulse is no longer a simple pulse pair, but a pseudo-random sequence with good autocorrelation properties is compared with the ranging baseband pulse pair signal by the spread spectrum modulation unitδ(t)+δ(t- θ pulse )]A pulse pair formed by spread spectrum modulation spreads the spectrum modulation signal; when ranging, the good autocorrelation characteristic of the pseudo-random sequence makes the ranging pulse easy to form a sharp autocorrelation peak, thereby being very beneficial to capturing the ranging time point and enabling the calculated radio transmission time to be more accurate.
Compared with the prior art, the technical scheme disclosed by the invention is beneficial to improving the ranging precision of the short-range radio navigation system.
(3) Facilitating improved interference immunity of short-range radio navigation systems
In the prior art, the identification signal and the ranging pulse sent by the short-range radio navigation system ground beacon response signal generating device are both conventional amplitude modulation signals and are transmitted by fixed frequency; according to the communication countermeasure theory, the signals are easy to interfere in the channel transmission process, the anti-interference capability is weak, and the ranging reliability of the short-range radio navigation system is difficult to ensure.
In the technical scheme disclosed by the invention, the ranging pulse and the identification signal sent by the short-range radio navigation system ground beacon response signal generating device are firstly subjected to spread spectrum modulation by the spread spectrum modulation unit and then subjected to carrier modulation by the carrier modulation unit, and the spread spectrum modulation unit spreads the energy of the ranging pulse signal and the beacon identification signal to a wider frequency spectrum range, so that the power spectrum density is greatly reduced; in the channel transmission process, the signal has stronger signal hiding capability and stronger narrow-band interference resistance.
Therefore, compared with the prior art, the technical scheme disclosed by the invention is beneficial to improving the anti-interference capability of the short-range radio navigation system.
Additional advantages and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following and practice of the invention.
Drawings
Fig. 1 is a schematic diagram of a short-range radio navigation system ranging beacon response signal generating device according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with fig. 1, with the examples being set forth only to illustrate the present invention and not to limit the scope of the invention.
In the prior art, when the short-range radio navigation system performs ranging, the response signal transmitted by the ground beacon response signal generating device includes a beacon identification signal and a ranging pulse signal. However, the identification signal and the ranging signal sent by the ground beacon response signal generating device are sent in a time-sharing manner, and in a serial manner, the ground beacon identification and the ranging can only be carried out in a time-sharing manner, that is, the ranging can not be carried out during the identification, so that the short-range radio navigation system has long ranging time and low working efficiency, which is one of the bottlenecks that the working capacity of the short-range radio navigation system is difficult to improve. Further, in the prior art, ranging of the short-range radio navigation system is achieved by capturing the rising edge of the ranging pulse, and the slow rising edge characteristic of the adopted bell-shaped ranging pulse can lead to low ranging precision and cannot meet the requirement of high-precision ranging. Further, in the prior art, the identification signal sent by the ground beacon response signal generating device is a conventional amplitude modulation signal, and is sent by fixed frequency, so that the ground beacon response signal generating device is easy to be interfered, has weak anti-interference capability in the channel transmission process, and is difficult to ensure the ranging reliability of the short-range radio navigation system.
In order to solve the problem, the invention discloses a short-range radio navigation system ranging beacon response signal generating device which improves the working efficiency and the ranging precision of the short-range radio navigation system ranging and improves the reliability of the ranging. As shown in fig. 1, the apparatus includes a timing unit, a ranging baseband pulse pair generating unit, a pseudo random sequence generating unit, a spread spectrum modulating unit, a beacon identification code generating unit, an identification code loading unit, a cosine carrier generating unit, a carrier modulating unit and a radio frequency unit.
The timing unit is used for generating a timing signal and outputting the timing signal to the ranging baseband pulse pair generating unit.
The ranging baseband pulse pair generating unit generates a repetition period under the action of the timing signal as followsT s Ranging baseband pulse pair signal [δ(t)+δ(t-θ pulse )]And output to a spread spectrum modulation unit, wherein,θ pulse for the interval time of two pulses in the ranging baseband pulse pair, i.e. two pulses in the ranging baseband pulse pair signalδ(t)、δ(t-θ pulse ) In the present embodimentθ pulse 12 mus.
The pseudo-random sequence generating unit is used for generating a pseudo-random sequence with good autocorrelation characteristics and outputting the pseudo-random sequence to the spread spectrum modulating unit.
The spread spectrum modulation unit separates the chip amplitude of the pseudo-random sequence and the ranging baseband pulse pair signal according to the chip order of the pseudo-random sequence from low to highδ(t)+δ(t-θ pulse )]Multiplying to generate pulse pair spread spectrum modulation signal, and outputting to the identification code loading unit.
The beacon identification code generating unit is used for generating a beacon identification code sequence and outputting the beacon identification code sequence to the identification code loading unit.
The identification code loading unit multiplies each chip amplitude of the beacon identification code sequence with the pulse pair spread spectrum modulation signal according to the sequence of the chips from low to high of the beacon identification code sequence to generate an identification code loading signal, and outputs the identification code loading signal to the carrier modulation unit;
the cosine carrier generating unit is used for generating a cosine carrier signalcos2πftAnd output to the carrier modulation unit;
the carrier modulation unit is used for loading the identification code with the cosine carrier signalcos2πftMultiplying to generate carrier modulation signal, andoutputting to a radio frequency unit;
the radio frequency unit is used for amplifying and filtering the power of the carrier modulation signal and then transmitting the carrier modulation signal to the antenna for radiation.
Further, in the technical solution disclosed in the embodiment of the present invention, the carrier modulation signal generated by the carrier modulation unit is:
，
wherein ,d j for the number of chipsMBeacon identification code sequence [d 1 ,d 2 ,d 3 ,…,d j , …,d M ]Is the first of (2)jThe amplitude of the individual chips is determined,β k for the number of chipsNPseudo-random sequence of [β 1 ,β 2 ,β 3 ,…,β k , …,β N ]Is the first of (2)kThe amplitude of the individual chips is determined,δ(t)for the ranging baseband pulse waveform,θ pulse to measure the separation time of two pulses in a baseband pulse pair,T s repeating the cycle time for the radio navigation system ranging beacon reply signal.
In the technical scheme disclosed by the embodiment of the invention, a spread spectrum modulation unit of a ground beacon response signal generating device carries out spread spectrum modulation on a pseudo random sequence generated by a pseudo random sequence generating unit and a ranging baseband pulse pair generated by a ranging baseband pulse pair generating unit to form a pulse pair spread spectrum modulation signal for ranging; the identification code loading unit multiplies the identification code sequence generated by the beacon identification code generating unit with the pulse pair spread spectrum modulation signal according to the chip sequence to realize identification code loading; and finally forming a response signal through a carrier modulation unit.
In the technical scheme disclosed by the embodiment of the invention, the forming process of the pulse pair spread spectrum modulation signal for ranging generated by the spread spectrum modulation unit is as follows: pseudo-random sequence generating unit for generating pseudo-random sequence with good auto-correlation characteristicsβ 1 ,β 2 ,β 3 ,…,β k , …,β N ]And output to a spread spectrum modulation unit; the repetition period of the ranging baseband pulse pair generating unit is as followsT s Ranging baseband pulse pair signal [δ(t)+δ(t-θ pulse )]And output to a spread spectrum modulation unit; the spread spectrum modulation unit sequentially divides each chip amplitude of the pseudo random sequence from low to highβ k Respectively with distance measuring baseband pulse pair signalδ(t)+δ(t-θ pulse )]Multiplying to generate a pulse pair spread spectrum modulated signal; the pulse-pair spread spectrum modulated signal is:
，
wherein ,β k for the number of chipsNPseudo-random sequence of (c)kThe amplitude of the individual chips is determined,δ(t)for the ranging baseband pulse waveform,θ pulse to measure the separation time of two pulses in a baseband pulse pair,T s repeating the cycle time for the radio navigation system ranging beacon reply signal.
Further, in the technical solution disclosed in the embodiment of the present invention, the forming process of the identification code signal generated by the identification code loading unit and used for identifying the beacon station is:
the beacon identification code generating unit is used for generating a beacon identification code sequenced 1 ,d 2 ,d 3 ,…,d j , …,d M ]And output to the identification code loading unit; the identification code loading unit loads the respective chip amplitudes of the beacon identification code sequence in the order of the low to high chips of the beacon identification code sequenced j Multiplying the pulse pair spread spectrum modulation signals respectively to generate an identification code loading signal; the identification code loading signal is:
，
wherein ,d j for the number of chipsMThe beacon of (2) identifies the code sequencejThe amplitude of the individual chips is determined,β k for the number of chipsNPseudo-random sequence of (c)kThe amplitude of the individual chips is determined,δ(t)for the ranging baseband pulse waveform,θ pulse to measure the separation time of two pulses in a baseband pulse pair,T s repeating the cycle time for the radio navigation system ranging beacon reply signal.
Further, in the technical scheme disclosed in the embodiment of the invention, the pulse pair spread spectrum modulation signal, the identification code loading signal and the cosine carrier signalcos2πftThe multiplication realizes carrier modulation and forms a ranging beacon response signal of the radio navigation system.
In the technical scheme disclosed by the invention, the response signal generated by the response signal generating device of the ranging beacon of the short-range radio navigation system comprises both pulse pair signals for ranging and identification code signals for identifying the beacon, namely the response signal can simultaneously transmit the ranging pulse signals and the identification code signals and is realized in a parallel mode, so that the identification and ranging time is shortened. In the prior art, the identification code signal and the ranging signal sent by the short-range radio navigation system ground beacon response signal generating device are sent in a time-sharing way, and the ground beacon identification and the ranging can only be carried out in a time-sharing way by adopting a serial way, namely, the ranging can not be carried out during the identification, so that the short-range radio navigation system has long ranging time and low working efficiency, and the short-range radio navigation system has one of the bottlenecks that the working capacity of the short-range radio navigation system is difficult to improve.
Therefore, compared with the prior art, the technical scheme disclosed by the embodiment of the invention is beneficial to improving the measurement efficiency of the short-range radio navigation system. Further, the short-range radio navigation system is beneficial to improving the ranging efficiency and the working capacity of the system. In an embodiment of the invention, the working capacity refers to the maximum number of on-board devices that a short-range radio navigation system can accommodate for co-operation with at the same time. The larger the working capacity of the system is, the more the number of the aircrafts can be ensured, and the working efficiency of the short-range radio navigation system and the flying efficiency of the aircrafts are improved, so that the economic benefit is improved.
In the prior art, a pulse signal used for ranging by a ranging beacon response signal generating device of a short-range radio navigation system adopts bell-shaped pulses, and the pulse signal has no explicit solution and is not easy to generate; in the prior art, there are improved pulse forms, which are realized by combining the first half cycle waveform with steep rising edge and the original bell-shaped pulse, that is, by means of synthesizing waveforms, so as to improve the ranging performance, but the methods further increase the complexity of pulse waveform realization. In order to solve the problems in the prior art, in the technical scheme disclosed by the embodiment of the invention, the ranging baseband pulse waveformδ(t) Gaussian pulse. The Gaussian pulse waveform has good rising edge and falling edge characteristics, is easy to realize and has low equipment complexity.
In the prior art, short range radio navigation system ranging is typically accomplished by capturing the rising edge of the ranging pulse; however, due to the slow rising edge characteristic of the ranging pulse, the ranging accuracy is low, and the high-accuracy ranging requirement cannot be met.
In order to solve the problems existing in the prior art and improve the ranging accuracy, in the technical proposal disclosed by the embodiment of the invention, the ranging pulse is not a simple bell-shaped pulse any more, but a pseudo random sequence with good autocorrelation property is generated by a spread spectrum modulation unitβ 1 ,β 2 ,β 3 ,…,β k , …,β N ]With distance measuring baseband pulse pair signalδ(t)+δ(t-θ pulse )]A pulse pair formed by spread spectrum modulation spreads the spectrum modulation signal; pseudo-random sequence in rangingβ 1 ,β 2 ,β 3 ,…,β k , …,β N ]Has good autocorrelation characteristics, and makes the ranging pulse easy to form sharp autocorrelation peak, thereby being very beneficial to capturing the ranging time point and makingThe calculated radio transmission time is more accurate.
Compared with the prior art, the technical scheme disclosed by the invention is beneficial to improving the ranging precision of the short-range radio navigation system.
In the prior art, the identification signal and the ranging pulse sent by the short-range radio navigation system ground beacon response signal generating device are both conventional amplitude modulation signals and are transmitted by fixed frequency; according to the communication countermeasure theory, the signals are easy to interfere in the channel transmission process and have weak anti-interference capability, so that the ranging reliability of the short-range radio navigation system is difficult to ensure.
In order to solve the problems in the prior art, in the technical scheme disclosed by the invention, the ranging pulse and the identification signal sent by the short-range radio navigation system ground beacon response signal generating device are firstly subjected to spread spectrum modulation and identification code loading through the spread spectrum modulation unit and the identification code loading unit, and then are subjected to carrier modulation through the carrier modulation unit to form the response signal. Further, in the technical solution disclosed in the embodiment of the present invention, each chip time length of the identification code sequence is equal to the sum of all chip time lengths of the pseudo random sequence. According to the transformation relation between the duration and the frequency spectrum, the pseudo-random sequence expands the frequency spectrum of the identification code sequence signal and the ranging pulse pair signal, and achieves the effect of frequency expansion, thereby reducing the power spectral density of the response signal and improving the concealment capability of the response signal. The precondition for implementing electromagnetic interference is that firstly, an interfered signal is intercepted by interception equipment, the signal characteristics of the interfered signal are analyzed to obtain signal parameters, and on the basis, an interference machine can release interference signals with similar parameters to implement interference; in the technical scheme disclosed by the embodiment of the invention, the frequency spectrum of the response signal is widened through the pseudo-random sequence generating unit and the spread spectrum modulating unit, so that the hiding capacity of the response signal is improved, the anti-interception capacity is improved, the parameter of the response signal is difficult to master by an interfering party, and effective interference cannot be implemented.
Therefore, compared with the prior art, the technical scheme disclosed by the embodiment of the invention is beneficial to improving the anti-interference capability of the short-range radio navigation system.
In the prior art, the autocorrelation characteristics of the pseudo-random sequences have large differences due to different implementation manners. The M sequence is easier to generate and has a weak good autocorrelation property relative to other pseudo-random sequences. Preferably, in the technical solution disclosed in the embodiment of the present invention, the pseudo-random sequence generated by the pseudo-random sequence generating unit has a good auto-correlation characteristic and is an M sequence.
In the prior art, the identification signal and the ranging pulse sent by the short-range radio navigation system ground beacon response signal generating device are both conventional amplitude modulation signals and are transmitted by fixed frequency; according to the communication countermeasure theory, the signals are easy to interfere in the channel transmission process and have weak anti-interference capability, so that the ranging reliability of the short-range radio navigation system is difficult to ensure.
In order to solve the problems in the prior art, in the technical scheme disclosed by the invention, the ranging pulse and the identification signal sent by the short-range radio navigation system ground beacon response signal generating device are firstly subjected to spread spectrum modulation and identification code loading through the spread spectrum modulation unit and the identification code loading unit, and then are subjected to carrier modulation through the carrier modulation unit to form the response signal. Further, in the technical solution disclosed in the embodiment of the present invention, each chip time length of the identification code sequence is equal to the sum of all chip time lengths of the pseudo random sequence. According to the transformation relation between the duration and the frequency spectrum, the pseudo-random sequence expands the frequency spectrum of the identification code sequence signal and the ranging pulse pair signal, and achieves the effect of frequency expansion, thereby reducing the power spectral density of the response signal and improving the concealment capability of the response signal. The precondition for implementing electromagnetic interference is that firstly, an interfered signal is intercepted by interception equipment, the signal characteristics of the interfered signal are analyzed to obtain signal parameters, and on the basis, an interference machine can release interference signals with similar parameters to implement interference; in the technical scheme disclosed by the embodiment of the invention, the frequency spectrum of the response signal is widened through the pseudo-random sequence generating unit and the spread spectrum modulating unit, so that the hiding capacity of the response signal is improved, the anti-interception capacity is improved, the parameter of the response signal is difficult to master by an interfering party, and effective interference cannot be implemented.
Therefore, compared with the prior art, the technical scheme disclosed by the embodiment of the invention is beneficial to improving the anti-interference capability of the short-range radio navigation system.
In the prior art, the autocorrelation characteristics of the pseudo-random sequences have large differences due to different implementation manners. The M sequence is easier to generate and has a weak good autocorrelation property relative to other pseudo-random sequences. Preferably, in the technical solution disclosed in the embodiment of the present invention, the pseudo-random sequence generated by the pseudo-random sequence generating unit has a good auto-correlation characteristic and is an M sequence.
Short-range radio navigation system beacon identification is also one of the important processes in the prior art to achieve ranging. Beacon identification is used to distinguish between individual beacons deployed in an airport, and signals typically in the form of "dots" or "dashes" are arranged in various combinations to represent combinations of letters or numbers in the form of mole codes. However, the representation mode is complex, and the occupied time of the identification code is long, so that the time length of the identification of the beacon station is increased, and the real-time performance of the ranging of the radio navigation system is reduced.
In order to solve the problems in the prior art, in the technical proposal disclosed in the embodiment of the invention, a ground beacon station identifies a code sequenced 1 ,d 2 ,d 3 ,…,d j , …,d M ]The method consists of 18-bit bipolar binary sequences, which are used for representing three-bit beacon addresses, are represented by combinations of uppercase English letters or combinations of uppercase English letters and numbers or combinations of numbers, and are used for distinguishing each ground beacon, so that the identification of the beacon is realized, namely 6-bit bipolar binary sequences are used for representing uppercase English letters or numbers. For example, a beacon identifier may be represented by a combination of capital letters and numbers "0AC", where the corresponding identifier code sequence is "-1+1+1+1-1+1+1-1-1-1-1+1-1-1-1+1+1, where" -1+1+1+1+1+1+1+1+1 ""is used to denote the number" 0"," -1-1-1-1+1 "is used to denote the uppercase english letter" a "," -1-1-1+1 "is used to denote the uppercase letter" C ". Compared with the prior art, the technical scheme disclosed by the embodiment of the invention has the advantages that the method for representing the identification code of the beacon is simple, the occupied time is short, and the measurement instantaneity of the short-range radio navigation system is improved. As to how to use the 6-bit bipolar binary sequence to represent the uppercase english alphabets or numbers, the bipolar binary sequence corresponding to the uppercase english alphabets or numbers can be used, which is a known or conventional technical means for those skilled in the art, and will not be described herein.
In the technical scheme disclosed in the embodiment of the invention, the cosine carrier signal generated by the cosine carrier generating unitcos2πftThe carrier frequency of the microwave antenna works in the microwave L band, and the frequency range is 962 MHz-1213 MHz. Further, the cosine carrier generating unit has an X mode and a Y mode, and generates a cosine carrier signal when operating in the X modecos2πftThe carrier frequency working range is 962 MHz-1024 MHz, 1151 MHz-1213 MHz, when working in Y mode, the generated cosine carrier signalcos2πftThe carrier frequency operating range of (a) is 1025MHz to 1150MHz.
Cosine carrier signal generated by cosine carrier generating unitcos2πftThe carrier frequency of the microwave antenna works in the microwave L band, and the frequency range is 962 MHz-1213 MHz. Further, the cosine carrier generating unit has an X mode and a Y mode, and generates a cosine carrier signal when operating in the X modecos2πftThe carrier frequency working range is 962 MHz-1024 MHz, 1151 MHz-1213 MHz, when working in Y mode, the generated cosine carrier signalcos2πftThe carrier frequency operating range of (a) is 1025MHz to 1150MHz.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A short-range radio navigation system ranging beacon response signal generating device, characterized in that: the device comprises a timing unit, a ranging baseband pulse pair generating unit, a pseudo random sequence generating unit, a spread spectrum modulating unit, a beacon identification code generating unit, an identification code loading unit, a cosine carrier generating unit, a carrier modulating unit and a radio frequency unit;
the timing unit is used for generating a timing signal and outputting the timing signal to the ranging baseband pulse pair generating unit;
the ranging baseband pulse pair generating unit generates a repetition period ofT s Ranging baseband pulse pair signal [δ(t)+δ(t-θ pulse )]And output to the spread spectrum modulation unit, wherein,δ(t) For the ranging baseband pulse waveform,θ pulse the interval time of two pulses in the ranging baseband pulse pair is set;
the pseudo-random sequence generating unit is used for generating a pseudo-random sequence with good autocorrelation characteristics and outputting the pseudo-random sequence to the spread spectrum modulating unit;
the spread spectrum modulation unit respectively compares each chip amplitude of the pseudo random sequence with the ranging baseband pulse pair signal according to the chip sequence from low to high of the pseudo random sequenceδ(t)+δ(t-θ pulse )]Multiplying to generate a pulse pair spread spectrum modulation signal and outputting the signal to the identification code loading unit;
the beacon identification code generating unit is used for generating a beacon identification code sequence and outputting the beacon identification code sequence to the identification code loading unit;
the identification code loading unit multiplies each chip amplitude of the beacon identification code sequence by the pulse pair spread spectrum modulation signal according to the chip sequence from low to high of the beacon identification code sequence to generate an identification code loading signal, and outputs the identification code loading signal to the carrier modulation unit;
the cosine carrier generating unit is used for generating a cosine carrier signalcos2πftAnd output to the carrier modulation unit;
the carrier modulation unit is used for loading the identification code with the informationNumber and cosine carrier signalcos2πftMultiplying to generate a carrier modulation signal and outputting the carrier modulation signal to the radio frequency unit;
the radio frequency unit is used for amplifying and filtering the power of the carrier modulation signal and then transmitting the carrier modulation signal to an antenna for radiation.
2. The short-range radio navigation system ranging beacon response signal generating apparatus according to claim 1, wherein the carrier modulation signal generated by the carrier modulation unit is:
，
wherein ,d j for the number of chipsMBeacon identification code sequence [d 1 ,d 2 ,d 3 ,…,d j , …,d M ]Is the first of (2)jThe amplitude of the individual chips is determined,β k for the number of chipsNPseudo-random sequence of [β 1 ,β 2 ,β 3 ,…,β k , …,β N ]Is the first of (2)kThe amplitude of the individual chips is determined,δ(t)for the ranging baseband pulse waveform,θ pulse for the interval time of two pulses in the ranging baseband pulse pair,T s repeating a cycle time for the radio navigation system ranging beacon reply signal.
3. The short-range radio navigation system ranging beacon response signal generating apparatus according to claim 2, wherein the ranging baseband pulse waveformδ(t) Gaussian pulse.
4. The short-range radio navigation system ranging beacon response signal generating device according to claim 2, wherein the pseudo random sequence generated by the pseudo random sequence generating unit has a good auto-correlation characteristic as an M sequence.
5. The short-range radio navigation system ranging beacon response signal generating device according to claim 2, wherein the beacon identification code sequence generated by the beacon identification code generating unit is composed of 18-bit bipolar binary identification code sequences for distinguishing beacon addresses; each chip time length of the bipolar binary identification code sequence is equal to a sum of all chip time lengths of the pseudo-random sequence.
6. The short-range radio navigation system ranging beacon response signal generating apparatus according to claim 2, wherein the timing unit is configured to generate a timing signal including an interval time signal of the ranging baseband pulse pair and output the timing signal to the ranging baseband pulse pair generating unitθ pulse And repeating cycle time signal of said ranging baseband pulse pairT s 。
7. The short-range radio navigation system ranging beacon response signal generating device according to claim 2, wherein the cosine carrier signalcos2πftIs operated in the microwave L band.
8. The short-range radio navigation system ranging beacon response signal generating apparatus according to claim 7, wherein the cosine carrier generating unit has an X-mode and a Y-mode, and the cosine carrier signal is generated when operating in the X-modecos2πftThe carrier frequency working range of the antenna is 962 MHz-1024 MHz and 1151 MHz-1213 MHz; when operating in Y mode, the generated cosine carrier signalcos2πftThe carrier frequency operating range of (a) is 1025MHz to 1150MHz.
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