CN102739588B - Emergency announcement call system based on FM/Chirp modulation - Google Patents
Emergency announcement call system based on FM/Chirp modulation Download PDFInfo
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Abstract
The invention relates to an emergency announcement call system based on FM/Chirp modulation and belongs to the emergency communication field. The emergency announcement call system is formed by a FM/Chirp modulator, a power amplifier, a transmitting antenna, narrowband FM receiving terminals and channels which connect the transmitting antenna with the each narrowband FM receiving terminal. A baseband signal to be modulated is input to the FM/Chirp modulator so as to carry out carrier wave modulation. Power amplification is performed on an obtained FM/Chirp modulated carrier wave by the power amplifier, and then the modulated carrier wave is emitted through the transmitting antenna, passes through channel transmission and is taken as an input signal of the corresponding narrowband FM receiving terminals. The narrowband FM receiving terminals demodulate and recover a reduction sample of the baseband signal to be modulated from the received FM/Chirp modulated carrier wave. By using the emergency announcement call system provided in the invention, announcement call covering to a plurality of narrowband carrier wave channels can be realized only through transmitting one FM/Chirp modulated carrier wave. Current narrowband FM receiving equipment can be still used and a working mode does not need to be converted. It is convenient to use a resonance power amplifier to realize large power transmission and long distance covering.
Description
Technical field
The present invention relates to a kind of emergent logical broadcast system based on FM/Chirp modulation, belong to emergency communication field.
Background technology
Dedicated mobile communications subsystem has that single-frequency is conventional, double frequency is conventional and cluster three kinds of main Types, and based on group calling working method, prevailing transmission is used for speech or the data of dispatch control.In single-frequency routine and double frequency conventional system, the terminal of same phone group is waited in the carrier channel of same frequency; In group system, each terminal in same phone group is waited on the control channel of the base station accessed at it.Under normal circumstances, different phone groups waits in the carrier channel of different frequency, is do not need or do not allow intercommunication between each phone group.But, when emergency event is disposed, for the needs of cooperative scheduling commander, often need to realize interim emergent intercommunication between each phone group at emergent scene place, the user that especially commanding power is higher needs to cross over intermediate level temporarily and assumes unified command of low-level user or directly command.In the emergency disposal work of reality, emergent scene is easy to multiple phone groups of assembling from different regions or department, different phone groups may work in the system of difference (type or frequency range), probably natively do not interconnect between different system and maybe can not realize interconnecting, and exchange radio station, mutually notice the work of catchword/operating frequency and so on and be often difficult to, be therefore difficult to realize under case of emergency across group intercommunication.
Chirp modulation, also known as frequency sweep modulation, being that frequency by controlling sinusoidal carrier makes monotone variation on a large scale by specific rule and a kind of band spectrum modulation mode of being formed in time, still belonging to frequency modulation type; Chirp modulation is that time span unit repeats with frequency sweep cycle, and the modulated carrier after Chirp modulation is also referred to as Chirp pulse carrier.The frequency change rule of Chirp pulse carrier in a frequency sweep cycle is referred to as frequency sweep rule.The frequency sweep rule of Chirp pulse carrier has monotone increasing, monotonic decreasing two kinds of citation forms, also there is the simple combination form of first monotone increasing monotonic decreasing, first monotonic decreasing monotone increasing and so on more again, also have the complex combination form monotone increasing of some and monotonic decreasing rule being undertaken by certain order being spliced to form; The Changing Pattern of its monotone increasing and monotonic decreasing also has dividing of linear processes.Be limited to Chirp pulse carrier to produce and demodulation institute adopts the physical structure of surface acoustic wave (SAW) device, traditional Chirp modulation is difficult to the quantitative requirement to frequency sweep rule in satisfied communication.In recent years, along with the maturation of Digital Frequency Synthesize (DDS) technology, the Chirp pulse carrier that carrier frequency stepping (Stepping) changes can be produced easily.For the ease of distinguishing, the carrier frequency Chirp pulse carrier that (Continuous) changes continuously is called C-Chirp pulse carrier, the Chirp pulse carrier that carrier frequency stepping (Stepping) changes is called S-Chirp pulse carrier.
FM/Chirp modulation is a kind of combination frequency modulation system formed by carrying out secondary frequency modulation(FM) (FM) to Chirp pulse carrier, and the modulated carrier produced by FM/Chirp modulation system is also referred to as FM/Chirp modulated carrier.According to the difference of used Chirp pulse carrier type, FM/Chirp modulation can be divided into the large class of FM/C-Chirp and FM/S-Chirp two; According to the difference of secondary frequency modulation type, FM/Chirp modulation also can be divided into multiple subclass such as analog linearity FM/C-Chirp, analog linearity FM/S-Chirp, FFSK/C-Chirp, FFSK/S-Chirp, 4FSK/C-Chirp, 4FSK/S-Chirp, C4FM/C-Chirp, C4FM/S-Chirp.In order to avoid obscuring of implication, in follow-up description, when being used alone Chirp mono-word, mean C-Chirp and S-Chirp, when being used alone FM mono-word, mean the analog or digital frequency modulated mode that may use.
FM modulation in arrowband is the current main flow modulation system of dedicated mobile communications subsystem, the dedicated mobile communication terminal adopting arrowband FM to modulate uses in a large number in emergency disposal work, same dispatch control order sends to by the characteristic utilizing FM/Chirp to modulate to be convenient to realize large bandwidth to cover simultaneously multiplely waits for the arrowband FM receiving terminal on different carrier channel, thus realizing interim emergent intercommunication, this is significant for cooperative scheduling commander during emergency disposal.
Summary of the invention
The problem to be solved in the present invention is to provide a kind of emergent logical broadcast system based on FM/Chirp modulation, by adopting FM/Chirp modulation same dispatch control order to be distributed to the warbled receiving terminal of multiple employings waited on different carrier channel simultaneously, realize broadcasting transmission to the emergent logical of scheduling order command.In order to solve this problem, a kind of composition structure of the emergent logical broadcast system based on FM/Chirp modulation, the course of work and optimization of working parameters criterion thereof are first provided, and by embodiment, the optimization of working parameters of this emergent logical broadcast system and application are further described.
Based on an emergent logical broadcast system for FM/Chirp modulation, be made up of FM/Chirp modulator (11), power amplifier (12), transmitting antenna (13), N (N >=1) individual arrowband FM receiving terminal (141-14N) and the N number of channel (151-15N) connected between transmitting antenna (13) and N number of arrowband FM receiving terminal (141-14N); Should be as follows based on course of work of the emergent logical broadcast system of FM/Chirp modulation: baseband signal to be modulated is inputed to FM/Chirp modulator (11) and carry out carrier modulation by FM/Chirp mode and obtain a road FM/Chirp modulated carrier, the road FM/Chirp modulated carrier that FM/Chirp modulator (11) exports externally is launched by transmitting antenna (13) after the power amplification of power amplifier (12), and as the input signal of corresponding arrowband FM receiving terminal (141-14N) after the transmission of channel (151-15N); Arrowband FM receiving terminal (141-14N) demodulation from the FM/Chirp modulated carrier that it receives recovers the reduction sample of baseband signal to be modulated.
Above-mentioned based in the emergent logical broadcast system of FM/Chirp modulation, FM/Chirp modulator (11) carries out frequency modulation(FM) by baseband signal to be modulated to Chirp pulse carrier, the power spectrum of its FM/Chirp modulated carrier exported is made up of many discrete spectral lines, and the Changing Pattern of the centre frequency of the discrete spectral line of every root is similar with the carrier frequency variation rule adopting identical baseband signal offset of sinusoidal carrier wave to be modulated to carry out being formed when FM modulates.During arrowband FM receiving terminal (141-14N) demodulation, the frequency modulated mode of corresponding type is identical with the frequency modulated mode that FM/Chirp modulator (11) uses when baseband signal to be modulated is carried out frequency modulation(FM) to Chirp pulse carrier; Its carrier channel of waiting for is positioned within the bandwidth range of the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports.
Above-mentioned based in the emergent logical broadcast system of FM/Chirp modulation, when baseband signal to be modulated is analog signal, the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports use the frequency sweep cycle length of frequency sweep rule to be less than the single Cycle Length of the highest effective frequency component in baseband signal to be modulated; When baseband signal to be modulated is digital signal, the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports use the frequency sweep cycle length of frequency sweep rule to be less than the time duration of single base-band digital code element to be modulated.Such Selecting parameter, the interference being convenient to utilize the low-pass filtering treatment in the demodulation output procedure of arrowband FM receiving terminal (141-14N) to suppress periodically to repeat frequency sweep to bring, thus improve the signal quality of the reduction sample of the baseband signal to be modulated that arrowband FM receiving terminal (141-14N) exports.
Above-mentioned based in the emergent logical broadcast system of FM/Chirp modulation, the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports use frequency sweep rule can adopt the variation tendency of monotone increasing or monotonic decreasing, and the variation tendency of monotone increasing and monotonic decreasing can linearly or nonlinear rule change.Such optimization of working parameters can bring corresponding benefit: (1) is when adopting the variation tendency of monotone increasing or monotonic decreasing, the frequency periodically repeating the interference components that frequency sweep is brought in the demodulation result of arrowband FM receiving terminal is fixed, and is conducive to the signal quality of the reduction sample improving the baseband signal to be modulated that arrowband FM receiving terminal exports, (2) when the rule change of monotone increasing linearly or monotonic decreasing, the energy of FM/Chirp modulated carrier is uniformly distributed in its bandwidth, be suitable for each phone group wait between arrowband FM receiving terminal that the frequency distribution situation of carrier channel and each phone group use with transmitting antenna (13) all unforeseen situation of distance under provide the logical of equalization to broadcast covering performance, (3) when FM/Chirp modulated carrier use the rule change of frequency sweep rule by nonlinear monotone increasing or monotonic decreasing time, the energy of FM/Chirp modulated carrier is uneven distribution in its bandwidth, be suitable for different phone group to wait for the frequency distribution situation of carrier channel known, optimize when distance between the arrowband FM receiving terminal that the arrowband FM receiving terminal that same phone group uses and different phone group roughly the same from the distance between transmitting antenna (13) uses and transmitting antenna (13) is different and coverage effect is broadcast to the logical of each phone group.
Above-mentioned based in the emergent logical broadcast system of FM/Chirp modulation, the frequency sweep rule that the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports uses can change by continuous or step-type mode.When the frequency sweep rule that FM/Chirp modulated carrier uses changes by continuation mode, the C-Chirp pulse carrier being convenient to adopt linear voltage controlled oscillator (VCO) to produce is to realize FM/C-Chirp modulation; When the frequency sweep rule that FM/Chirp modulated carrier uses is by stepwise change, be then convenient to adopt Digital Frequency Synthesize (DDS) circuit to produce the S-Chirp pulse carrier needed for FM/S-Chirp modulation or the FM/S-Chirp modulated carrier directly needed for generation.
Above-mentioned based in the emergent logical broadcast system of FM/Chirp modulation, " arrowband " of arrowband FM receiving terminal is comparatively speaking, and namely its reception carrier channel width is narrow for the bandwidth that will cover logical sowing time.Such as: each reception carrier channel width is 12.5KHz (as narrow-band FM intercom), two need to differ 50KHz between the logical reception carrier channel broadcasting covering, then can meet the demands when about 75KHz for the logical bandwidth broadcasting the FM/Chirp modulated carrier of covering, now 12.5KHz is arrowband, and 75KHz is then broadband; If each reception carrier channel width is 200KHz (as FM broadcasting), and between the reception carrier channel of highest frequency and the reception carrier channel of low-limit frequency, differ 19.5MHz, then just can meet the demands when about 20MHz for the logical bandwidth broadcasting the FM/Chirp modulated carrier of covering, now 200KHz is arrowband, and 20MHz is only broadband.
Emergent logical broadcast system based on FM/Chirp modulation provided by the invention, make use of the characteristic that FM/Chirp modulation is convenient to realize large bandwidth covering, only need launch a road FM/Chirp modulated carrier and just can realize broadcasting covering to multiple the logical of narrowband carrier channel; Arrowband FM receiving terminal can continue to use existing arrowband FM receiving equipment (as frequency-modulation intercom for use, FM receiver), and emergent leading to when broadcasting covering does not need arrowband FM receiving terminal to change its mode of operation; Meanwhile, FM/Chirp modulated carrier is still frequency-modulated wave, is convenient to adopt tuned power amplifier to realize high-power transmitting and remote covering, and therefore this emergent logical broadcast system has very high emergent using value and good effect.
Accompanying drawing explanation
Figure 1 shows that the composition structure of the emergent logical broadcast system based on FM/Chirp modulation provided by the invention.Wherein, 11 is FM/Chirp modulator, 12 power amplifiers, and 13 is transmitting antennas, and 141-14N is arrowband FM receiving terminal, and 151-15N is channel.
Figure 2 shows that the position relationship schematic diagram of the reception carrier channel of the bandwidth shared by FM/Chirp modulated carrier that in embodiment, FM/Chirp modulator (11) exports and arrowband FM receiving terminal (141-14N); Wherein, 20 is bandwidth shared by FM/Chirp modulated carrier that FM/Chirp modulator (11) exports, and 21-2N is the position of the reception carrier channel of arrowband FM receiving terminal (141-14N).
Embodiment
The present embodiment is for illustration of emergent Selecting parameter and the application of leading to broadcast system based on FM/Chirp modulation provided by the invention, and adopt system configuration as shown in Figure 1, its course of work sees above the relevant description stated in part, no longer repeats at this.A kind of typical operating parameters design of this emergent logical broadcast system is as follows: the simulated voice of baseband signal to be modulated to be frequency range be 300-3KHz, the concrete modulation system of carrying out FM modulation to Chirp pulse carrier in FM/Chirp modulator (11) is analog linearity FM (16F3), the frequency sweep cycle of the Chirp pulse carrier used in FM/Chirp modulator (11) is 80 microseconds (corresponding sweep rate is 12.5K cycles/sec), arrowband FM receiving terminal (151-15N) adopts the reception carrier channel width of 25KHz and carries out frequency demodulation by analog linearity FM (16F3) mode, the position relationship of the bandwidth of the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports and the reception carrier channel of arrowband FM receiving terminal (141-14N) as shown in Figure 2.
Under above-mentioned running parameter condition, frequency interval between the adjacent discrete spectral line of the FM/Chirp modulated carrier that FM/Chirp modulator (11) exports is 12.5KHz, therefore must at least have a discrete spectral line and drop within the reception carrier channel width of the 25KHz that each arrowband FM receiving terminal (151-15N) adopts; Because the frequency range of the baseband signal to be modulated of demodulation recovery is 300-3KHz, and sweep rate is 12.5K cycles/sec, therefore the low-pass filtering treatment in each arrowband FM receiving terminal (151-15N) demodulation output procedure can produce obvious amplitude and suppress to the Sweeping nonlinearity component being positioned at 12.5KHz place in demodulation result, thus the quality of the analogue voice signal that FM receiving terminal (151-15N) demodulation of each arrowband is exported is within acceptable scope.
Similarly, when baseband signal to be modulated is digital signal, if the concrete frequency modulated mode that FM/Chirp modulator (11) uses is 4FSK/Chirp, sweep rate is still 12.5K cycles/sec, then can realize broadcasting the emergent logical of digital conventional narrow-band FM receiving terminal of DMR and DPMR standard; If the concrete frequency modulated mode that FM/Chirp modulator (11) uses is C4FM/Chirp, sweep rate is still 12.5K cycles/sec, then can realize broadcasting the emergent logical of digital conventional narrow-band FM receiving terminal of APCO-25 standard; If the concrete frequency modulated mode that FM/Chirp modulator (11) uses is analog linearity FM (the FM frequency modulation of about ± 50KHz), sweep rate is 100K cycles/sec, then can realize broadcasting the emergent logical of existing FM broadcast receiver.
For the arrowband FM receiving terminal worked under cluster mode, due to need according to the instruction of control channel start demodulation obtain the output of simulated voice or data, therefore need first to lead to and broadcast transmit on the control channel of trunked base station logical and broadcast control signal, and then logically broadcast (analog or digital) speech or data message that will transmit.If control signal and voice signal have employed different modulation systems respectively in group system, then FM/Chirp modulator (11) also will adapt to modulation systems different accordingly.Such as, in the analog cluster system adopting MPT-1327 signaling, what control channel command transmitting adopted is FFSK modulation, what traffic channel transmission simulated voice adopted is that analog linearity FM modulates (16F3), then FM/Chirp modulator (11) needs compatibility to realize analog linearity FM/Chirp and FFSK/Chirp to modulate, first work in that the transmission of FFSK/Chirp modulation system is logical broadcasts control signal, and then work in analog linearity FM/Chirp modulation system transportation simulator speech.
Claims (4)
1., based on an emergent logical broadcast system for FM/Chirp modulation, be made up of modulator (11), power amplifier (12), transmitting antenna (13), arrowband FM receiving terminal (141-14N) and the channel (151-15N) connected between transmitting antenna (13) and arrowband FM receiving terminal (141-14N); Baseband signal to be modulated is inputed to modulator (11) to carry out carrier modulation by frequency modulated mode and obtain a road modulated carrier, the road modulated carrier that modulator (11) exports externally is launched by transmitting antenna (13) after the power amplification of power amplifier (12), and through the transmission of channel (151-15N) as the input signal of corresponding arrowband FM receiving terminal (141-14N); Arrowband FM receiving terminal (141-14N) demodulation from the modulated carrier that it receives recovers the reduction sample of baseband signal to be modulated; It is characterized in that:
Described modulator (11) is FM/Chirp modulator; Described frequency modulated mode is FM/Chirp modulation;
Described modulated carrier is FM/Chirp modulated carrier; When baseband signal to be modulated is analog signal, this FM/Chirp modulated carrier use the frequency sweep cycle length of frequency sweep rule to be less than the single Cycle Length of the highest effective frequency component in baseband signal to be modulated; When baseband signal to be modulated is digital signal, this FM/Chirp modulated carrier use the frequency sweep cycle length of frequency sweep rule to be less than the time duration of single base-band digital code element to be modulated;
Described arrowband FM receiving terminal (141-14N), during its demodulation, the frequency modulated mode of corresponding type is identical with the frequency modulated mode that modulator (11) uses when baseband signal to be modulated is carried out frequency modulation(FM) to Chirp pulse carrier; Its carrier channel of waiting for is positioned within the bandwidth range of the modulated carrier that modulator (11) exports.
2. the emergent logical broadcast system based on FM/Chirp modulation according to claim 1, described modulated carrier is FM/Chirp modulated carrier, it is characterized in that: the frequency sweep rule that this FM/Chirp modulated carrier uses changes by continuous or step-type mode, that is this FM/Chirp modulated carrier is FM/C-Chirp modulated carrier or FM/S-Chirp modulated carrier.
3. the emergent logical broadcast system based on FM/Chirp modulation according to claim 1 and 2, described modulated carrier is FM/Chirp modulated carrier, it is characterized in that: this FM/Chirp modulated carrier use frequency sweep rule to adopt the variation tendency of monotone increasing or monotonic decreasing.
4. the emergent logical broadcast system based on FM/Chirp modulation according to claim 3, described modulated carrier is FM/Chirp modulated carrier, it is characterized in that: this FM/Chirp modulated carrier use the variation tendency of the monotone increasing in frequency sweep rule and monotonic decreasing linearly or nonlinear rule change.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110082620.0A CN102739588B (en) | 2011-04-02 | 2011-04-02 | Emergency announcement call system based on FM/Chirp modulation |
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| CN201110082620.0A CN102739588B (en) | 2011-04-02 | 2011-04-02 | Emergency announcement call system based on FM/Chirp modulation |
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| CN102739588B true CN102739588B (en) | 2015-04-22 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1241073A (en) * | 1998-07-03 | 2000-01-12 | 熊庆旭 | Data communication system with automatic frequency sweep in FM broadcast subchannel and continuous phase frequency-shift keying |
| CN101107539A (en) * | 2005-01-19 | 2008-01-16 | 史密斯集团有限公司 | Radar apparatus |
| US7742152B2 (en) * | 2006-06-23 | 2010-06-22 | University Of Kansas | Coherent detection scheme for FM chirped laser radar |
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- 2011-04-02 CN CN201110082620.0A patent/CN102739588B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1241073A (en) * | 1998-07-03 | 2000-01-12 | 熊庆旭 | Data communication system with automatic frequency sweep in FM broadcast subchannel and continuous phase frequency-shift keying |
| CN101107539A (en) * | 2005-01-19 | 2008-01-16 | 史密斯集团有限公司 | Radar apparatus |
| US7742152B2 (en) * | 2006-06-23 | 2010-06-22 | University Of Kansas | Coherent detection scheme for FM chirped laser radar |
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| CN102739588A (en) | 2012-10-17 |
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