Built-in-external antenna signal input automatic-switching global position system (GPS)/personal digital assistant (PDA) dual-frequency handset

Abstract

The invention discloses a built-in-external antenna signal input automatic-switching global position system (GPS) / personal digital assistant (PDA) dual-frequency handset, which comprises a handset body, a GPS processing chip module and a GPS receiving module, wherein the GPS receiving module comprises a GPS receiving antenna and a GPS receiver; the GPS receiving antenna comprises a built-in antenna and an external antenna; the GPS receiver comprises a built-in-external antenna signal switching module; the built-in antenna and the external antenna receive GPS radio frequency signals at a target measuring point respectively, and transmit the received GPS radio frequency signals to the built-in-external antenna signal switching module respectively; and the built-in-external antenna signal switching module automatically selects input signals input into a GPS processing chip (a processing chip on GPS-original electrical manufacture (OEM) board) module according to the signal intensity of the GPS radio frequency signals fed back by the built-in antenna and the external antenna. Therefore, the handset solves the problem of switching between the built-in antenna and the external antenna, and also can be used to work when the signals are relatively weaker or the requirement on measurement accuracy is relatively higher.

Description

technical field [0001] The invention belongs to the technical field of high-precision GPS handheld measuring systems, in particular to a GPS / PDA dual-frequency handheld that automatically switches the input of internal and external antenna signals and a method thereof. Background technique [0002] At present, GPS dual-frequency handsets on the market have only one built-in antenna, so they can only be used in urban areas with strong satellite signals in most cases, and one built-in antenna is enough to meet the usual needs. However, when the signal is weak or high-precision measurement requirements are required, it is difficult to meet the requirements with a single built-in antenna. [0003] Generally speaking, the operating unit mainly uses GPS receivers in pairs, one as a base station and the other as a mobile station, and uses the radio to broadcast differential correction information, and collects data for field operations through single-base station positioning. Usua...

AI Technical Summary

Problems solved by technology

Usually the operating distance is 10 kilometers, and the positioning accuracy of the GPS receiver decreases rapidly with the increase of the baseline length

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