
The difference between the GPS version and the cellular version is mainly
in the function of wireless connection. The gps version refers to wireless
access only through WiFi. The cellular version has a built-in mobile module that
can access the cellular mobile network.
The difference between gps and cellular version
1. The difference between the GPS and the cellular version. The former
means that this device can only use WiFi as the wireless connection signal and
has the gps positioning function; The latter means that on the basis of the
former's wireless connection function, it also has a cellular wireless network,
which supports the use of eSIM and other methods to access the Internet;
2. Generally speaking, there is no difference between the GPS version and
the cellular version of the iPad in terms of hardware, except for the network
part. In terms of appearance, because the antenna of the mobile network is
required, there will be a plastic part or an injection molded separator strip,
which is required for the mobile cellular network antenna;
3. As for the GPS version of Apple Watch, it can't be used completely
without iPhone, so you need to use iPhone network to download updated software
and data; In addition, in terms of hardware, the cellular network version has
more than 16GB of memory besides being able to access the Internet through
eSIM;
Analyzing the Advantages and Disadvantages of GPS Positioning from the
Working Principle of GPS
(1) Advantages:
Compared with inertial navigation, GPS navigation does not need to install
an inertial platform and its control system. It does not have such high
requirements for the working environment. It only requires space satellites,
ground base stations, and user terminal equipment to achieve navigation.
Moreover, the location covered by the navigation is global, with low civil
price, short observation time, no intervisibility between stations, simple
instrument operation, and low environmental requirements.
Characteristics of GPS compared with other navigation systems
Global continuous ground coverage;
Multiple functions and high precision;
Fast real-time positioning speed;
Good anti-interference performance and strong confidentiality.
(2) Disadvantages:
Since GPS navigation transmits signals through radio, it includes all the
disadvantages of radio. It will be affected by many signals, such as radio
waves, tall buildings, etc. GPS will be obstructed and reflected by walls, so it
cannot directly conduct indoor positioning. There are many errors in GPS
navigation: caused by space satellites: satellite clock error, ephemeris error;
Signal propagation: ionospheric propagation delay, tropospheric propagation
delay, multipath effect error; Receiver generation: receiver noise; Earth
rotation; System error;
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