CN107911186B - CORS data broadcasting system and method - Google Patents
CORS data broadcasting system and method Download PDFInfo
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
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Abstract
本发明公开了一种CORS数据广播系统，它的FM广播信号激励器的信号输出端连接信号合路器的FM广播数据输入端，卫星定位差分数据中心的数据输出端连接数据服务器的信号输入端，数据服务器的信号输出端连接卫星定位差分数据调制器的信号输入端，卫星定位差分数据调制器的信号输出端连接信号合路器的卫星定位差分数据调制信号输入端，信号合路器的信号输出端连接FM广播发射系统的信号输入端，信号合路器用于将FM广播数据信号和卫星定位差分数据调制信号进行功率合成形成广播节目与卫星定位差分数据的混合广播信号。本发明极大地降低了CORS数据分发成本，用户数量不受限制，CORS数据质量大大提高。
The invention discloses a CORS data broadcast system. The signal output end of its FM broadcast signal exciter is connected to the FM broadcast data input end of the signal combiner, and the data output end of the satellite positioning differential data center is connected to the signal input end of the data server. , the signal output end of the data server is connected to the signal input end of the satellite positioning differential data modulator, the signal output end of the satellite positioning differential data modulator is connected to the satellite positioning differential data modulation signal input end of the signal combiner, and the signal of the signal combiner The output end is connected to the signal input end of the FM broadcast transmission system, and the signal combiner is used to power-synthesize the FM broadcast data signal and the satellite positioning differential data modulation signal to form a mixed broadcast signal of the broadcast program and the satellite positioning differential data. The present invention greatly reduces the cost of CORS data distribution, the number of users is not limited, and the quality of CORS data is greatly improved.
Description
技术领域Technical field
本发明涉及卫星定位差分数据(CORS，Continuously Operating ReferenceStations)分发方案，具体地指一种CORS数据广播系统及方法。The present invention relates to a satellite positioning differential data (CORS, Continuously Operating ReferenceStations) distribution scheme, and specifically refers to a CORS data broadcasting system and method.
背景技术Background technique
北斗导航系统是我国研制的全球卫星导航定位系统，具有高精度、全天候、全球覆盖、方便灵活等特点，在各领域的应用已迅速展开。普通的北斗接收机定位精度约为10米左右，并不能满足高精度定位等应用场景的要求，建立北斗地基差分增强系统可以很好地解决定位精度问题。The Beidou navigation system is a global satellite navigation and positioning system developed in my country. It has the characteristics of high precision, all-weather, global coverage, convenience and flexibility, and has been rapidly applied in various fields. The positioning accuracy of ordinary Beidou receivers is about 10 meters, which cannot meet the requirements of high-precision positioning and other application scenarios. The establishment of a Beidou ground-based differential enhancement system can well solve the problem of positioning accuracy.
现有的地基差分增强系统多采用移动通信或数传电台实现差分数据(CORS数据)的播发，存在覆盖区域受限、环境适应能力差、使用成本高等诸多问题，难以大规模推广应用。Existing ground-based differential enhancement systems mostly use mobile communications or digital radio stations to broadcast differential data (CORS data). They have many problems such as limited coverage area, poor environmental adaptability, and high usage costs, making it difficult to promote and apply on a large scale.
发明内容Contents of the invention
本发明的目的就是要提供一种CORS数据广播系统及方法，本发明利用现有调频广播的基础设施以及频谱资源，采用带内同频广播技术，可以在不停播原有模拟调频广播的同时，在同一频道里播出CORS数字信号。The purpose of the present invention is to provide a CORS data broadcasting system and method. The present invention utilizes the existing FM broadcasting infrastructure and spectrum resources and adopts in-band same-frequency broadcasting technology, so that the original analog FM broadcasting can be broadcast without stopping. , broadcasting CORS digital signals on the same channel.
本发明所设计的一种CORS数据广播系统，其特征在于：它包括FM广播信号激励器、信号合路器、卫星定位差分数据中心、数据服务器、卫星定位差分数据调制器和FM(频率调制，Frequency Modulation)广播发射系统，其中，所述FM广播信号激励器的信号输出端连接信号合路器的FM广播数据输入端，卫星定位差分数据中心的数据输出端连接数据服务器的信号输入端，数据服务器的信号输出端连接卫星定位差分数据调制器的信号输入端，卫星定位差分数据调制器的信号输出端连接信号合路器的卫星定位差分数据调制信号输入端，信号合路器的信号输出端连接FM广播发射系统的信号输入端，所述信号合路器用于将FM广播数据信号和卫星定位差分数据调制信号进行功率合成形成广播节目与卫星定位差分数据的混合广播信号。A CORS data broadcast system designed by the present invention is characterized in that: it includes an FM broadcast signal exciter, a signal combiner, a satellite positioning differential data center, a data server, a satellite positioning differential data modulator and FM (frequency modulation, Frequency Modulation) broadcast transmission system, wherein the signal output end of the FM broadcast signal exciter is connected to the FM broadcast data input end of the signal combiner, the data output end of the satellite positioning differential data center is connected to the signal input end of the data server, and the data The signal output end of the server is connected to the signal input end of the satellite positioning differential data modulator. The signal output end of the satellite positioning differential data modulator is connected to the satellite positioning differential data modulation signal input end of the signal combiner. The signal output end of the signal combiner Connected to the signal input end of the FM broadcast transmission system, the signal combiner is used to power-synthesize the FM broadcast data signal and the satellite positioning differential data modulation signal to form a mixed broadcast signal of the broadcast program and the satellite positioning differential data.
一种CORS数据广播方法，其特征在于，它包括如下步骤：A CORS data broadcast method, characterized in that it includes the following steps:
步骤1：卫星导航定位基准站(CORS站)接收卫星信息并计算出卫星定位差分源数据，与卫星定位差分数据中心对应的多个卫星导航定位基准站的源数据在卫星定位差分数据中心(CORS中心)形成卫星定位差分源数据组，数据服务器将卫星定位差分数据中心输出的卫星定位差分源数据组与对应的解算方案信息一起发送给卫星定位差分数据调制器，卫星定位差分数据调制器向信号合路器输送卫星定位差分数据调制信号；Step 1: The satellite navigation and positioning reference station (CORS station) receives satellite information and calculates the satellite positioning differential source data. The source data of multiple satellite navigation and positioning base stations corresponding to the satellite positioning differential data center are stored in the satellite positioning differential data center (CORS). center) to form a satellite positioning differential source data group, the data server sends the satellite positioning differential source data group output by the satellite positioning differential data center and the corresponding solution plan information to the satellite positioning differential data modulator, and the satellite positioning differential data modulator The signal combiner transmits satellite positioning differential data modulated signals;
同时FM广播信号激励器向信号合路器发送FM广播数据信号；At the same time, the FM broadcast signal exciter sends FM broadcast data signal to the signal combiner;
步骤2：信号合路器将FM广播数据信号和卫星定位差分数据调制信号进行功率合成形成广播节目与卫星定位差分数据的混合广播信号；Step 2: The signal combiner performs power synthesis on the FM broadcast data signal and the satellite positioning differential data modulation signal to form a mixed broadcast signal of the broadcast program and the satellite positioning differential data;
步骤3：FM广播发射系统将广播节目与卫星定位差分数据的混合广播信号进行广播。Step 3: The FM broadcast transmission system broadcasts the mixed broadcast signal of the broadcast program and satellite positioning differential data.
所述步骤1中，数据服务器将卫星定位差分数据中心输出的卫星定位差分源数据组和对应的解算方案信息采用循环播发的方式和/或块数据播发的方式和/或趋势函数(算法)播发的方式转发给卫星定位差分数据调制器。In step 1, the data server uses a cyclic broadcast method and/or a block data broadcast method and/or a trend function (algorithm) to broadcast the satellite positioning differential source data group and the corresponding solution plan information output by the satellite positioning differential data center. The broadcast method is forwarded to the satellite positioning differential data modulator.
本发明中利用现有调频广播的基础设施以及频谱资源，采用带内同频广播技术，可以在400KHz频宽内不停播原有调频广播的同时，在同一频道里播出数字广播信号，即卫星定位差分数据。The present invention utilizes the existing FM broadcasting infrastructure and spectrum resources and adopts in-band same-frequency broadcasting technology. It can broadcast digital broadcasting signals in the same channel while continuing to broadcast the original FM broadcasting within the 400KHz bandwidth, that is, Satellite positioning differential data.
本发明利用现有调频广播的基础设施以及频谱资源，采用带内同频广播技术，可以在400KHz频宽内不停播原有模拟调频广播的同时，在同一频道里播出北斗差分数据信号。本发明充分利用现有的调频广播频率、发射设备、发射台设施等既有资源，极大地降低了CORS数据分发成本，用户数量不受限制，CORS数据质量大大提高。This invention utilizes the existing FM broadcasting infrastructure and spectrum resources and adopts in-band same-frequency broadcasting technology. It can broadcast Beidou differential data signals on the same channel while continuing to broadcast the original analog FM broadcasting within the 400KHz bandwidth. The present invention makes full use of existing resources such as FM broadcast frequencies, transmitting equipment, and transmitting station facilities to greatly reduce CORS data distribution costs, the number of users is not limited, and the quality of CORS data is greatly improved.
附图说明Description of the drawings
图1为本发明的原理框图。Figure 1 is a functional block diagram of the present invention.
1—FM广播信号激励器、2—信号合路器、3—卫星定位差分数据中心、4—数据服务器、5—卫星定位差分数据调制器、6—FM广播发射系统。1—FM broadcast signal exciter, 2—signal combiner, 3—satellite positioning differential data center, 4—data server, 5—satellite positioning differential data modulator, 6—FM broadcast transmission system.
具体实施方式Detailed ways
以下结合附图和具体实施例对本发明作进一步的详细说明：The present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples:
一种CORS数据广播系统，如图1所示，它包括FM广播信号激励器1、信号合路器2、卫星定位差分数据中心3、数据服务器4、卫星定位差分数据调制器5和FM广播发射系统6，其中，所述FM广播信号激励器1的信号输出端连接信号合路器2的FM广播数据输入端，卫星定位差分数据中心3的数据输出端连接数据服务器4的信号输入端，数据服务器4的信号输出端连接卫星定位差分数据调制器5的信号输入端，卫星定位差分数据调制器5的信号输出端连接信号合路器2的卫星定位差分数据调制信号输入端，信号合路器2的信号输出端连接FM广播发射系统6的信号输入端，所述信号合路器2用于将FM广播数据信号和卫星定位差分数据调制信号进行功率合成形成广播节目与卫星定位差分数据的混合广播信号。A CORS data broadcast system, as shown in Figure 1, includes an FM broadcast signal exciter 1, a signal combiner 2, a satellite positioning differential data center 3, a data server 4, a satellite positioning differential data modulator 5 and an FM broadcast transmitter System 6, wherein the signal output end of the FM broadcast signal exciter 1 is connected to the FM broadcast data input end of the signal combiner 2, the data output end of the satellite positioning differential data center 3 is connected to the signal input end of the data server 4, and the data The signal output end of the server 4 is connected to the signal input end of the satellite positioning differential data modulator 5. The signal output end of the satellite positioning differential data modulator 5 is connected to the satellite positioning differential data modulation signal input end of the signal combiner 2. The signal combiner The signal output end of 2 is connected to the signal input end of the FM broadcast transmission system 6. The signal combiner 2 is used to power combine the FM broadcast data signal and the satellite positioning differential data modulation signal to form a mixture of the broadcast program and the satellite positioning differential data. broadcast signal.
上述技术方案中，所述卫星定位差分数据中心3用于接收对应的各个卫星定位差分数据台的卫星定位差分源数据，形成卫星定位差分源数据组。In the above technical solution, the satellite positioning differential data center 3 is used to receive the satellite positioning differential source data of each corresponding satellite positioning differential data station to form a satellite positioning differential source data group.
上述技术方案中，所述数据服务器4用于将卫星定位差分数据中心3输出的卫星定位差分源数据组和对应的解算方案信息转发给卫星定位差分数据调制器5。In the above technical solution, the data server 4 is used to forward the satellite positioning differential source data group and corresponding solution solution information output by the satellite positioning differential data center 3 to the satellite positioning differential data modulator 5 .
上述技术方案中，所述数据服务器4用于将FM广播发射系统辐射范围内的卫星定位差分源数据组进行处理得到FM广播发射系统辐射范围内区域地理中心所对应的卫星定位差分源数据转发给卫星定位差分数据调制器5；In the above technical solution, the data server 4 is used to process the satellite positioning differential source data group within the radiation range of the FM broadcast transmission system to obtain the satellite positioning differential source data corresponding to the regional geographical center within the radiation range of the FM broadcast transmission system and forward it to Satellite positioning differential data modulator 5;
或者，数据服务器4用于通过载波相位差分设备(RTK，Real—time kinematic)获取FM广播发射系统所在位置对应的卫星定位差分源数据转发给卫星定位差分数据调制器5。供终端设备定位使用。Alternatively, the data server 4 is used to obtain satellite positioning differential source data corresponding to the location of the FM broadcast transmission system through a carrier phase difference device (RTK, Real-time kinematic) and forward it to the satellite positioning differential data modulator 5 . Used for terminal device positioning.
上述技术方案中，所述数据服务器4对卫星定位差分源数据组采用循环播发的方式进行转发，同时，数据服务器4还转发所述循环播发方式的解算方案信息，所述循环播发的方式为将FM广播发射系统辐射范围内的卫星定位差分源数据组根据预设的组内各个卫星定位差分源数据转发顺序进行依次轮流转发。In the above technical solution, the data server 4 forwards the satellite positioning differential source data group in a cyclic broadcast mode. At the same time, the data server 4 also forwards the solution solution information of the cyclic broadcast mode. The cyclic broadcast mode is: The satellite positioning differential source data groups within the radiation range of the FM broadcast transmission system are forwarded in turn according to the preset data forwarding sequence of each satellite positioning differential source in the group.
上述技术方案中，所述数据服务器4对卫星定位差分源数据组采用块数据播发的方式进行转发，同时，数据服务器4还转发所述块数据播发方式的解算方案信息，所述块数据播发的方式为将FM广播发射系统辐射范围内的卫星定位差分源数据组整合成数据帧进行转发。终端设备接收数据帧，并根据自身位置进行选用，并结合北斗卫星定位进行精确定位。In the above technical solution, the data server 4 forwards the satellite positioning differential source data group in the form of block data broadcast. At the same time, the data server 4 also forwards the solution plan information of the block data broadcast method. The block data broadcast method The method is to integrate the satellite positioning differential source data groups within the radiation range of the FM broadcast transmission system into data frames for forwarding. The terminal device receives the data frame and selects it according to its own position, and combines it with Beidou satellite positioning for precise positioning.
上述技术方案中，所述数据服务器4对卫星定位差分源数据组采用趋势函数播发的方式进行转发，同时，数据服务器4还转发所述趋势函数播发方式的解算方案信息，所述趋势函数播发的方式为将FM广播发射系统辐射范围内的卫星定位差分源数据组以及历史卫星定位差分源数据组进行分析和计算，给出与时间、位置相关的趋势函数进行转发。In the above technical solution, the data server 4 forwards the satellite positioning differential source data group in the way of trend function broadcast. At the same time, the data server 4 also forwards the solution plan information of the trend function broadcast. The trend function broadcast The method is to analyze and calculate the satellite positioning differential source data group within the radiation range of the FM broadcast transmission system and the historical satellite positioning differential source data group, and provide a trend function related to time and location for forwarding.
上述技术方案中，所述广播节目与卫星定位差分数据的混合广播信号中广播节目信号位于-130～130KHz频带，卫星定位差分数据位于-111～-143KHz和111～143KHz频带；In the above technical solution, in the mixed broadcast signal of the broadcast program and satellite positioning differential data, the broadcast program signal is located in the -130~130KHz frequency band, and the satellite positioning differential data is located in the -111~-143KHz and 111~143KHz frequency bands;
或者，广播节目与卫星定位差分数据的混合广播信号中广播节目信号位于-150～150KHz频带，卫星定位差分数据位于-148～-192KHz和148～192KHz频带。Or, in the mixed broadcast signal of the broadcast program and the satellite positioning differential data, the broadcast program signal is located in the -150 to 150 KHz frequency band, and the satellite positioning differential data is located in the -148 to -192 KHz and 148 to 192 KHz frequency bands.
上述技术方案中，信号合路器2内置放大器对卫星定位差分数据调制器5的信号进行放大之后,按照-14～20dB的比例与广播节目信号进行混合。In the above technical solution, the built-in amplifier of the signal combiner 2 amplifies the signal of the satellite positioning differential data modulator 5 and then mixes it with the broadcast program signal at a ratio of -14 to 20 dB.
一种CORS数据广播方法，它包括如下步骤：A CORS data broadcast method, which includes the following steps:
步骤1：卫星导航定位基准站(CORS站)接收卫星信息并计算出卫星定位差分源数据，与卫星定位差分数据中心3对应的多个卫星导航定位基准站的源数据在星定位差分数据中心3(CORS中心)形成卫星定位差分源数据组，数据服务器4将卫星定位差分数据中心3输出的卫星定位差分源数据组与对应的解算方案信息一起发送给卫星定位差分数据调制器5，卫星定位差分数据调制器5向信号合路器2输送卫星定位差分数据调制信号；Step 1: The satellite navigation and positioning reference station (CORS station) receives satellite information and calculates the satellite positioning differential source data. The source data of multiple satellite navigation and positioning base stations corresponding to the satellite positioning differential data center 3 are in the satellite positioning differential data center 3 (CORS center) forms a satellite positioning differential source data group. The data server 4 sends the satellite positioning differential source data group output by the satellite positioning differential data center 3 together with the corresponding solution solution information to the satellite positioning differential data modulator 5. The satellite positioning The differential data modulator 5 delivers the satellite positioning differential data modulated signal to the signal combiner 2;
同时FM广播信号激励器1向信号合路器2发送FM广播数据信号；At the same time, the FM broadcast signal exciter 1 sends the FM broadcast data signal to the signal combiner 2;
步骤2：信号合路器2将FM广播数据信号和卫星定位差分数据调制信号进行功率合成形成广播节目与卫星定位差分数据的混合广播信号；Step 2: The signal combiner 2 performs power synthesis on the FM broadcast data signal and the satellite positioning differential data modulation signal to form a mixed broadcast signal of the broadcast program and the satellite positioning differential data;
步骤3：FM广播发射系统6将广播节目与卫星定位差分数据的混合广播信号进行广播。Step 3: The FM broadcast transmitting system 6 broadcasts a mixed broadcast signal of the broadcast program and satellite positioning differential data.
上述技术方案的步骤1中，数据服务器4将卫星定位差分数据中心3输出的卫星定位差分源数据组和对应的解算方案信息采用循环播发的方式和/或块数据播发的方式和/或趋势函数播发的方式转发给卫星定位差分数据调制器5。In step 1 of the above technical solution, the data server 4 uses the satellite positioning differential source data group and the corresponding solution plan information output by the satellite positioning differential data center 3 in a cyclic broadcast method and/or a block data broadcast method and/or a trend. Function broadcast is forwarded to the satellite positioning differential data modulator 5.
本发明充分利用了现有调频广播基础设施，低廉的改造成本即可实现大范围覆盖；基于广播的传输模式，不存在用户数量高并发性问题；FM频段信号具备覆盖范围广、穿透能力强、恶劣天气不敏感的特点；特殊的信号帧结构设计，针对性优化抗多径性能抗噪声性能；支持120km/h的高速移动接收；接收机灵敏度低至-121dBm、传输时延小于1秒。This invention makes full use of the existing FM broadcast infrastructure, and can achieve wide-area coverage with low transformation costs; based on the broadcast transmission mode, there is no problem of high number of users concurrency; the FM band signal has wide coverage and strong penetration ability , Insensitive to bad weather; special signal frame structure design, targeted optimization of anti-multipath performance and anti-noise performance; supports high-speed mobile reception of 120km/h; receiver sensitivity is as low as -121dBm, and transmission delay is less than 1 second.
技术人员在室内环境下进行测试，在加载和不加载卫星定位差分数据的情况下对比谐波失真、信噪比等关键指标参数，以综合评估对于FM广播的影响。Technicians conducted tests in an indoor environment and compared key parameters such as harmonic distortion and signal-to-noise ratio with and without loading differential satellite positioning data to comprehensively evaluate the impact on FM broadcasting.
首先进行信号数模功率比测试：First, perform a signal digital-to-analog power ratio test:
FM广播信号激励器1输出功率约6.5W，卫星定位差分数据调制器5(激励器)输出功率约0.1mw，信号合路器2先对激励器信号进行放大、之后与FM信号混合，混合输出信号约5.05W。经过系统闭环测试。得到数模功率比＝-20.48，满足发射机工作要求。The output power of the FM broadcast signal exciter 1 is about 6.5W, the output power of the satellite positioning differential data modulator 5 (exciter) is about 0.1mw, the signal combiner 2 first amplifies the exciter signal, then mixes it with the FM signal, and the mixed output The signal is about 5.05W. After system closed-loop testing. The digital-to-analog power ratio is obtained = -20.48, which meets the working requirements of the transmitter.
然后进行信号合路前后谐波失真、信噪比等参数测试；Then, parameters such as harmonic distortion and signal-to-noise ratio are tested before and after the signals are combined;
测试结果如下：The test results are as follows:
表一音频源输出信号预置测试记录(备注：测试前校准仪器)Table 1 Audio source output signal preset test record (Note: Calibrate the instrument before testing)
表二谐波失真测试值记录表(备注：要求<1.5％)Table 2 Harmonic Distortion Test Value Recording Table (Remarks: Required <1.5%)
表三信噪比测试值记录表Table 3 Signal-to-noise ratio test value record table
测试结果表明：中功率合路方案FM信噪比高于52dB，信号谐波失真小于1.5％，技术指标满足要求。The test results show that the FM signal-to-noise ratio of the medium-power combining scheme is higher than 52dB, the signal harmonic distortion is less than 1.5%, and the technical indicators meet the requirements.
广播测试人员使用专用收听广播设备进行主观收听，一致认为FM广播播出信号在收听上无杂音等不良现象。Broadcast testers used special radio listening equipment to conduct subjective listening, and unanimously believed that the FM radio broadcast signal had no adverse phenomena such as noise in listening.
结论：卫星定位差分数据信号对FM广播节目播出质量无影响,不影响用户收听广播节目。Conclusion: Satellite positioning differential data signals have no impact on the broadcast quality of FM radio programs and do not affect users' ability to listen to radio programs.
本说明书未作详细描述的内容属于本领域专业技术人员公知的现有技术。Contents not described in detail in this specification belong to the prior art known to those skilled in the art.
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