Huazhonghan Aerospace Science and Technology Group Co., Ltd. seventh, Institute of Beijing 100076 Digest Introduction Seven, Qiao 9916, Ren 3 receiver performance index composition and working principle independently developed by the Institute.
Subject principle of satellite navigation and positioning +33 receiver +3 application 刖 Lube is a new generation of global satellite navigation system developed by the United States and Russia in the 1970s. It can achieve global all-weather real-time navigation positioning function users provide high-precision bit tomb speed and, etc. Seven-dimensional letter, this article introduces the operation principle of the receiver 33. The composition of the receiver 1.188. The receiver system consists of the antenna feeder and the receiver. The connection is related to the low-noise amplifier of the multi-band microstrip antenna and the large feeder. High-frequency electricity, the receiver includes channel mold soil, channel module. Navigation location, block and power supply, block 1 1.2 Principle of receiver The receiver is divided into multiple channels. The navigation computer part selects multiple channels. Due to the difference in signal frequency working mode and signal structure, the circuit is also slightly different. The principle box of the receiver is based on 20 Qiao Daoshan frequency comprehensive level 1 inverter. 1 pass filter amplifier. The human converter forms a filter filter, which is sent to the low-noise master 1 to be amplified, mixed with the local oscillator 1 signal, down-converted into 1 dozen intermediate frequency signals, filtered by the band pass filter and sent to the first-stage mixer ， Mixed with the local oscillator 2 signal to get the intermediate frequency positive 2 signal. This signal is filtered by the surface acoustic wave filter and amplified by the amplifier 2 and the person 3, and then mixed with the local oscillator 3 signal to obtain the intermediate frequency milk signal. After the person 4 is amplified, it is sent to the 0 converter to convert it to 2 and the digital signal sampling signal is 3. It is sent to the 03 channel processor to complete the code and carrier related processing, and the original measurement data such as the pseudorange pseudorange change rate is obtained 1.2.2 Due to the 0 and 33 channels in the Na channel, the frequency division system is used, and the occupied frequency band is very wide. The frequency 1 is 15977165.5. It is compatible with the satellites launched before 1998. Set the number to 10, pay 5 letters, Zha, first, 1 zoom , And then mix with the old letter 4 and play a few, people are old and middle frequency, its center frequency pseudo take out the old input from the mixer and send it to the demodulator, the date of receipt 200 hearts 0 buckle 29 and controllable frequency The local oscillator mixes and turns into baseband numbers and roads. , Road, frequency 1. , Baseband bit number is sent to high-speed human melon, after 302 sampling, it will be 28, Shuyukou, send; 1 training 33 channel device, complete signal capture tracking and demodulation Note 1 = 1602 pressure +56251; = 713; before 1998 Ruler 03 uses a dedicated channel processing circuit, its function frame is 3 10, 21-bit data from elbow 0 channel, system clock, high stability 10, clock common source, read and write control signals with computer interface, etc .; Tongxiaoshan 8 independent correlators, 1 connected to the asynchronous controller in real time, clock and reset control modules, and the 21 samples obtained by the 35-channel processor are sent to the correlator in digital quantity, and the code is completed under the control of 1. Carrier signal capture and follow-up, demodulation of pseudo-range and message data, by the M ampoule, the asynchronous response controller will transform the navigation solution into a brother communication format and send nine real-time clocks Counting time, if the external battery is connected, it can still keep the timing during the power outage, which is helpful to reduce the first positioning time. The reset control is used to generate the internal reset signal, and the reset signal of each part of the coordination channel is generated by the watchdog circuit. The computer interface is Hardware connected to the navigation computer Port, an address bus comprising a data bus and a control bus, a computer to implement the channel number set by taking these interfaces and interrupt handling.
Child 018 retreats 17th, the solo-sweet 8 communications, the 8th processor leads the chip, can be the same, processing 8 0,01 knocks. The signal 0 claw person 38 channel buried device 314 in which the sample number, computer interface control signals, including read and write interrupts, etc .; reason, as a special function.
The working principle of the device with 5 signals is similar to 5. However, due to the large difference in the signal structure of the two systems, such as: 15 seeking multiple accesses with milk, 1 piece of human code coffee is 1023, and 1485 uses frequency division Multiple access, the code length of the code is 5, so the circuit in the channel correlator is also different. For example, the length of the 035 code generator is 5, the clock frequency is 0.51IMII 1.2.5 navigation computer The navigation computer is composed of 5 It is processed by high-speed data It is composed of a computer and a peripheral circuit of the computer, which is used for data collection loop closed-loop control of text data demodulation and navigation calculation 10 command processing and positioning data output.
Self-checking late block self-checking module is mainly used for the receiver to check the internal inspection of the flashing muscle channel and the serial port, etc. The sound channel distribution module completes the control of satellite number distribution channels and frequency traces for 16 parallel channels. The 10 interface module receives external commands and parameters, and outputs measurement data and status.
2.3 The channel processing software digitizes the processing results of the spread spectrum correlator; processes and outputs the pseudorange pseudorange rate and navigation message; the satellite signal carrier Doppler frequency according to the parameters given by the system control software completes the acquisition and tracking of satellite signals Processing software Hill 1 and 5 kinds of modules make up the code capture module to search in the carrier frequency window, the human code, detect whether the signal energy exceeds the detection threshold, when it exceeds, enter the multi-resident detector to continue detection, determine whether the signal is captured if it has been captured Signal, it is determined to be locked and enter the tracking state, otherwise, change the search to hire a new search until the lock code tracking module agricultural code delay lock ring adult code tracking shoulder out of the wooden floor pseudo code and the input pseudo code and the pseudo code Anesthesia measurement.
After the carrier acquisition module captures, the local carrier and the satellite signal carrier are frequency-limited, and the Bian Bao tolerance is still relatively hot, generally more than a few hundred hertz. In order to accurately capture the signal of our wave, the use of human, automatic frequency Bian lock and 331 people 3 The 1 closed loop realizes our wave capture carrier tracking module. The wave frequency error of our wave Doppler has been very small after being captured, in order to obtain a high accuracy. Adopt narrow-band digital phase-locked loop (1) to complete carrier tracking, bit synchronization frame synchronization and data demodulation module to complete bit synchronization and frame synchronization, and then demodulate the navigation message to the navigation office. Shuttle block calculation and processing ephemeris almanac 2.4 navigation processing software navigating. The software completes the navigation message processing, predicts the navigation solution, and provides the positioning results. Real-time monitoring and positioning results. The navigation solution module is called to complete the single 5 single 038 or 0 to 1055, combined positioning, independent perfection monitoring service module. Normally, the faulty satellite data message processing shuttle is removed according to the monitoring results to demodulate the guardian ephemeris and almanac information from the navigation message. For navigation solution.
1 According to the ephemeris parameters, the satellite prediction calibration block calculates various correction parameters such as star position violations and clocks involved in positioning at a certain time for satellite acquisition.
According to the almanac parameters, calculate the rough position velocity, azimuth, elevation angle and Doppler frequency of each satellite at a certain time, for the system control software to select and track the Kexing 15 software overview. 3 The software in the receiver is quite complicated and closely related to the hardware. As mentioned above, the software includes multiple algorithms such as control goblet detection calculation and multiple interrupt handlers. The receiver performance index is closely related to the software processing method algorithm. In short, the 0 avoider software is a very important part of the receiver. The receiver software is stored in 5 receivers in the form of firmware, which is designed to change or upgrade the receiver software through the serial port.
3Technical indicators 3.1 Accuracy 3.4 Working mode According to user commands, it can work in combined positioning or single constellation positioning mode, and can also automatically switch to single constellation positioning mode in combined positioning mode 3.5 Positioning output dimension position dimension speed time of 0384 coordinate system Star collection state The number of stars collected is 00, etc., and the original measurement data such as pseudorange pseudorange rate carrier phase ephemeris is output 10 times per second. For differential positioning, it can get meter-level positioning accuracy. 3.6 Self-checking function. Receiver navigation software. Several types of integrity detection. The human function finds an abnormality of a seat shake in the hungry positioning state. It can automatically remove the old satellite data or switch. To single 015 or single, with one person 33 positioning, 4 conclusion processing high-speed data processing computer and other parts; the software is composed of various modes, such as navigation solution ephemeris demodulation satellite position calculation channel allocation and control 10 control and data transmission and reception, etc. It is relatively complicated. The self-developed 03399169916 single-board receiver has 16 channels and can simultaneously receive 8 signals and 8 people and 33 signals. The performance index of combined positioning is comparable to similar foreign receivers. The use of environmental conditions for dynamic performance and reliable penetration is excellent for thousands of civilian use; 55 receivers 1 week Chung Mo, Yi Jiejun. , 8 satellite measurement principles and applications. Surveying and Mapping Publishing House 6078 2 Wang Guangyun, Guo Bingyi, Li Hongtao. Differential 3 positioning technology and application. Electronic Industry Press 103134 3 Zha Guangming, Xiong Xianzuo. Spread spectrum communication. 23 Xi'an University of Electronic Science and Technology Author brief introduction Hua Zhonghan Researcher Deputy Chief Engineer has long been engaged in computer control and 03 related technology research
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