Design And Realization Of Airborne HF Station Detector

With the constant and rapid development of airborne HF stations,the maintainability and supportability of such stations are drawing more and more attention,and auxiliary detection equipment plays a nonnegligible role.A new airborne HF station detector was designed and realized in this paper to address such problems that currently domestic airborne HF station detectors have a great variety,poor universality,and insufficient scalability,and lack the ability to conduct functional tests in wireless contexts.The detector contained a controller and an HF transceiver.The controller provided 1553 B,ARINC429,Russian-made 18977,RS-422,and many other avionics data bus interfaces.It was able to convert data between bus and RS-232 interface by virtue of the corresponding bus interface modules.Each bus interface module could be taken out to connect the computer as a dedicated bus data converter that could be used alone.The HF transceiver had fixed-frequency,self-adaptation,and frequency-hopping wireless communication functions compatible with the existing airborne HF stations.It adopted DDS plus PLL frequency synthesis technology,able to provide high-resolution and stable HF signals for transmitting-receiving channel.It employed digital signal processing technology,enabling it to digitize signals below medium frequency,which improved the reliability of performance indicators.With three-stage power amplification technology,it could output power of up to 100 W at most when being supported as an independent wireless communication device.The transceiver realized a vector antenna tuner by using a new vector antenna impedance detection and impedance matching algorithm.The diagnostic database carried the factory's many years' valuable maintenance experience related to airborne HF stations,which could effectively raise the success rate of fault location and signal maintenance.In this paper,the user demands of detectors were analyzed and elaborated,with overall the development plan and detailed modular,structural,and software development plans being formed.Based on these,schematic diagrams and PCB drawings of all modules were designed.Then through assembly and commissioning,and by analyzing and solving problems occurring in the progress,the design met the inspection criteria of the user and also passed the functional and performance room temperature test,and the low-temperature,high-temperature,and vibration test arranged by the user.Then it passed the detector and 100 W and 200 W airborne HF station joint test arranged by the user,followed by the ground airplane system joint test.In this system joint test,the 13-times harmonic interference HF 130 MHz frequency point reception problem of 10 MHz crystal oscillator inside the detector was analyzed and solved,which also provided valued experience for the solutions to the electromagnetic compatible problem of the system in the future.In terms of the process,the new detector designed and implemented in this paper went through the planning stage,the scheme stage,the prototype development stage,and the experimental verification stage.At last,it passed the technical appraisal review and was delivered.The delivery of the detector is highly significant to the improvements of the maintenance and repair efficiency of airborne HF stations.With this device,users are also able to make major breakthroughs in the generalization,miniaturization,automation and wireless communication detection of airborne HF station detection devices.