Specifications

L70 Hardware Design

L70_HD_V1.0 - 11 -

2.3. Evaluation board

In order to help customers on the application of L70 module, Quectel supplies an Evaluation Board

(EVB) with appropriate power supply, RS-232 serial cable, active antenna and other peripherals to test

the module.

For more details, please refer to the document [1].

2.4. New technology

2.4.1. EASY technology

By Supplying aided information like ephemeris, almanac, rough last position and time, and satellite

status，AGPS can help improve GPS receiver TTFF and the acquisition sensitivity. The L70 module

supports EASY technology which is one kind of AGPS.

EASY works as an embedded software which can accelerate TTFF by predicting satellite navigation

messages from received ephemeris. The GPS engine will calculate and predict orbit information

automatically up to 3 days after first receiving the broadcast ephemeris, and saving the predicted

information into the internal memory. GPS engine will use these information for positioning if no

enough information from satellites, so the function will be helpful for positioning and TTFF

improvement under indoor and urban condition.

The EASY function can reduce TTFF to 5s for warm start. In this case, the backup power which

supplies power for the RTC circuit is necessary. If no backup power, L70 module cannot store the

extended ephemeris information and predict orbit information, in other words, it will become the cold

start. Although the EASY also can accelerate TTFF in cold start, the backup power is still strongly

recommended.

In order to gain enough broadcast ephemeris information from GPS satellites, the GPS module should

receive the information for at least 5 minutes in the good signal condition after it turned on.

EASY

function is enabled by default. The command “$PMTK869,0*29” can be used to query the

status of EASY. If EASY is enabled, the module returns“ $PMTK869,2,1*36”, else returns

“$PMTK869,2,0*37”.

2.4.2. AlwaysLocate

mode

AlwaysLocate

is an intelligent controller of L70 normal mode and sleep mode. It is one of the

power saving modes. According to the environmental and motion conditions, L70 can adaptively

adjust the on/off time to achieve the balance between positioning accuracy and power consumption.

Quectel

Confidential