GPS receiving machine signal test 5 Mode

　　The GPS test needs to be tested in the electromagnetic shielding room, using the E4438C \ n5182B vector signal source simulation satellite transmitting signal, adopts a multi -probe test system, and the omnidirectional scanning GPS receiver to receive the GPS signal at different positions. Effective communication between the computer needs to connect the computer and the mobile phone to the same local area network (tested through WIFI) through a wireless router. This solution provides the following five test modes:

　　1. Multi Satellites (multi -star sensitivity test)

　　Signal source simulation eight satellite signals are emitted with fixed power. Collect the situation of receiving this GPS signal from different directions in different directions to obtain the ability to receive the GPS signal in each direction of the mobile phone. In the direction where the mobile phone receives the strongest signal, the power of the signal source is hit down to find the critical point power that the mobile phone can locate. Based on the comparison of the obtained critical point power and the ability to receive signal in each direction of the mobile phone, the GPS sensitivity and 3D direction chart of the mobile phone can be calculated.

　　2. Multi Satellites Estimate (multi -star estimation test)

　　Assume that the mobile phone can be positioned after a certain GPS signal reaches a certain threshold. Signal source simulation eight satellite signals are emitted with fixed power. The GPS sensitivity and 3D direction diagram of the mobile phone are estimated based on the GPS CN0 received in all directions in all directions.

　　3. Single Satellites Estimate

　　Algorithms are similar to multi -star estimates. Single stars estimate simulated a signal of a star for testing. And adjust the signal source power to make the effective readings within the linear range of the signal. This reading can better reflect the ability of the receiving signal of the point. Finally, calculate the sensitivity and 3D direction chart of the GPS signal received by the CN0 value received by a single star in each direction.

　　4. CN0 Measurement (Single Star CN0 test)

　　Compared to Single Satellites, this mode does not need to detect whether the current point result is online, and the test result is the arithmetic average of the CN0 when the signal power is -130DB.

　　5. MSCN0 Measurement (multi -star CN0 test)

　　After the scanning end of the receiver to receive the GPS signal capacity in each direction of the receiver, find out the points and nan in the non -linear area for re -test until all points are online, and then calculate the arithmetic average of CN0.

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