Improvement of Methods for Testing of Navigation User Equipment of Global Navigation Satellite Systems Using a Navigation Signal Simulator

Abstract

Satellite navigation technologies are widely used around the world. Existing systems are constantly being upgraded, new satellites are being launched, satellite signals are being improved, military signals that are more resistant to interference are being gated in, ground-based navigation systems are being deployed, and the characteristics of GNSS user equipment are being improved.
 The effectiveness of GNSS user equipment is influenced by many different factors - from its internal circuit to the signal transmission medium where it is used. Testing of GNSS equipment consists in characterization of system performance and ensuring that manufacturer quality standards are met and expectations of the end user are satisfied. The solution of problems related to the testing of GNSS user equipment is the use of such equipment as simulators, GNSS signal recording and reproduction equipment, broad spectrum signal generation equipment, software for testing GNSS user equipment in laboratory conditions. The abovementioned equipment makes it possible to fully automate the test process by repeatedly performing user-defined scenarios.
 The use of signal generators for GNSS simulation has advantages over the use of a live GNSS signal. When using live signals the test conditions change constantly and unpredictably, therefore it is unlikely that two identical sequential tests will be performed under the same conditions. Retest is the most important requirement for the test process.
 The article deals with methods improvement and proposes the choice for rational equipment composition for GNSS user testing equipment.