Abstract: The present invention discloses a test method and arrangement for testing GNSS signals within a test chamber. The test chamber inner walls are supplied with transmitting antennas supplying simulated satellite signals, originating from a signal generator. Dynamic satellite movements are simulated by interpolating several transmitted signals in order to create a single true satellite transmission signal. All visible satellites are taken into account in order to create simulated GPS signals across the whole virtual sky. Phantom objects may be used near the device under test and the phantom object may be moved or rotated in preset patterns within the test chamber. Radio channel information can be modelled according to several different real-life environments, and also reflections from any surfaces and different multipath options are taken into account in the modeling, and also in the transmission antenna angles towards the device under test.

Abstract: The present invention discloses a test method and arrangement for testing GNSS signals within a test chamber. The test chamber inner walls are supplied with transmitting antennas supplying simulated satellite signals, originating from a signal generator. Dynamic satellite movements are simulated by interpolating several transmitted signals in order to create a single true satellite transmission signal. All visible satellites are taken into account in order to create simulated GPS signals across the whole virtual sky. Phantom objects may be used near the device under test and the phantom object may be moved or rotated in preset patterns within the test chamber. Radio channel information can be modelled according to several different real-life environments, and also reflections from any surfaces and different multipath options are taken into account in the modeling, and also in the transmission antenna angles towards the device under test.

Abstract: The invention pertains in general to the testing of the operation of radio and other data transmission apparatus. In particular the invention pertains to the testing of the operation of a digital radio apparatus on the basis of error statistics. In order to test functions relating to data transmission, a simulation system produces a pseudorandom bit sequence or some other test sequence which is packed into downlink frames and sent to the data transmission apparatus tested. In accordance with the invention, a known number of errors are generated in the test sequence. As the data transmission apparatus tested compares the received test sequence to the sequence it has produced, it detects the errors in the received sequence and compiles various error statistics, e.g., in the form of bit error ratio (BER) or frame erasure ratio (FER).

Abstract: The invention concerns a method and associated hardware units for testing the functioning of downlink data communication in a mobile station (202, 802, 902). The mobile station is equipped for receiving (302, 805) a signal in the downlink direction and for sending (312, 808) a signal in the uplink direction. As a part of the method, a test signal (711, 715, 716, 805) is received in the downlink direction. The received test signal is compared (208, 713, 908) to a known form of the test signal. There is produced and temporarily stored (209, 806, 909) information about errors which were detected in the received test signal during the comparing step. In the uplink direction a signal is sent (714, 717, 808) representing the stored information about errors.

Abstract: To test the functioning of downlink data communication a mobile station comprises means (301, 302, 303, 304, 326) for receiving a signal in the downlink direction and means (331, 310, 311, 312, 313) for sending a signal uplink. It receives a test signal in the downlink direction (301, 302, 602) and compares the received test signal to a known form of the test signal (208, 603). In addition, the mobile station stores information produced by the comparison about errors detected in the received test signal (209) and sends uplink a signal representing the information stored (312, 313, 604).