Research On Protocol Conformance Test Method For Satellite Navigation Messages

Satellite navigation message is one of the basic data of satellite navigation system to provide positioning and navigation service.The correctness of the navigation message itself and the accuracy of the receiver's navigation message processing will directly affect the performance of the receiver providing navigation service.There are mature theories and methods for testing the receiver signal processing and service performance indicators,but there is no systematic research results in the receiver's message integrity detection and navigation message processing accuracy verification.This paper studies the conformance test system,method and content of the telegram protocol for the conformance test requirements of the receiver navigation message protocol,and realizes the design and development of the telegram protocol conformance test system.Firstly,the thesis systematically studies the composition,structure,data content and coding mode of existing navigation messages in GPS,BDS,Galileo,GLONASS and other systems,and extracts the three-level structure and three-dimensional coding mode of the message.Then,based on the protocol conformance test theory and navigation message,a set of protocol conformance test methods for satellite navigation messages is proposed.Based on the analysis and modeling of the message,a navigation message consistency evaluation model is established,which is consistent with the message.Sexual refinement is to verify consistency,structural consistency,content consistency,and put forward 12 general evaluation indicators.From the perspective of boundary coverage and workload,the robustness test is selected as the test method and designed according to ICD.Test cases that are generally applicable to 66 navigation messages.Finally,a protocol conformance test system for satellite navigation messages is designed and implemented.Taking the navigation message of B3 I frequency of Beidou system as an example,421 test cases are designed and the navigation message protocol consistency is self-developed.test.The test results show that the navigation message protocol conformance test method proposed in this paper is feasible and effective.This paper closely combines the requirements of protocol conformance testing of satellite navigation messages in engineering practice,and proposes and implements a complete satellite navigation message protocol conformance test method.The test results show that the proposed method is feasible,effective and complete,and can be used for receivers.Whether to have navigation message protocol consistency for testing.