How to judge the performance of the GPS module?

How to judge the performance of the GPS module?

A good R&D engineer will not only design the solution, but also use the GPS module reasonably, understand various GPS modules and use it reasonably. It is also a necessary skill for wireless module design. The following Bo Shijie share some basic requirements of the GPS module:


How to judge the performance of the GPS module?


1, good receiving sensitivity


Receive sensitivity is the minimum received signal power that the receiver can correctly take out the useful signal. The good receiving sensitivity of the GPS navigation module enables wireless products to have a stronger ability to capture weak signals. Thus, as the transmission distance increases, the received signal becomes weak, and high-sensitivity wireless products can still receive data, maintain a stable connection, and greatly increase the transmission distance.



2, extremely fast positioning time;



The positioning time refers to how long the GPS device will automatically start to determine its position, usually in seconds. When this time is reached, the GPS device sends a signal to the GPS positioning satellite to begin determining its position. And includes the initial start, cold start, hot (warm) start positioning time. Whether it is car navigation or map navigation in mobile phones, it is based on the GPS module. The shorter the positioning time, the easier the test data is. At present, the cold start time of the GPS module developed and produced by the Bosch IoT business group is 23s, the warm start time is 2~3s, and the hot start time is less than 1s.



3. Position accuracy;



Position accuracy refers to the degree to which the spatial point acquires the coordinate value and its true coordinate value. Accuracy of positioning accuracy is the basis of GPS positioning module design. If the positioning accuracy does not reach the functional effect, then the gorgeous GPD module design will make people happy. Of course, different navigation environments must first consider the use of the situation, and then consider other factors.



Positioning accuracy can be investigated under static and dynamic conditions, and dynamic positioning is better than static positioning. The nominal positioning parameters of the GPS module are measured under the condition that the satellite signal is excellent under a completely open sky. Therefore, it is difficult to achieve the nominal positioning time and positioning accuracy in conventional tests.



4, power consumption;



Power consumption, that is, power loss, refers to the difference between input power and output power of devices and devices. With the rapid development of computer technology and microelectronic technology, the application field of embedded systems is more and more extensive. Energy conservation is the craze of globalization. For example, many chips in computers used to be powered by 5V. Now they use 3.3V and 1.8V, and put forward the concept of green system. Many manufacturers pay great attention to the low power consumption of GPS modules. The low-power design of circuits and systems has always been an important factor to be considered when designing electronic engineering technicians. The power consumption of GPS modules developed and produced by Bosch is only a few tens of milliamps, which are low-power modules, engineers. Can be used with confidence.



5, time accuracy;



Time accuracy is a classification based on the metrics required by each user and is a way to measure. The time precision can be divided into nanoseconds (ns), picoseconds (ps), microseconds (us), milliseconds (ms), seconds (s), minutes (min), and hours (h).


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