GNSS Receiver Purchase _Specs.pdf

GNSS Receiver and Field Controller Purchase – Schedule of Items, Specs, Discussion, and Recommendations

This purchase is to replace aging and obsolete survey grade GPS receivers in Region 6 of the USFS. These receivers receive a radio transmission from satellites and broadcasts a radio signal to other receivers for the purpose of determining precise positions on the earth.

This purchase request is for 8 GNSS receivers, 6 data collectors/controllers, 6 data collection software packages, and all necessary accessories for their operation (batteries, chargers, attachment hardware, etc.)

Refer to attached sole source request form for recommended sole source for vendor and items. Note that the quote from sole source vendor includes equipment trade in credit.

SPECIFICATIONS

The following specifications must be met by the receiver purchased:

• Must fully integrate with and utilize radio corrections sent from Trimble R12 GNSS receivers currently utilized by R6 Lands Boundary Surveying staff.

• Must be compatible with Trimble Access currently utilized by R6 Lands Boundary Surveying staff.

• 3 receivers must have IMU tilt compensation

• Must be able to send UHF radio corrections to a radio repeater, and receive UHF radio corrections

• Must be able to track the following signals on, with a minimum of 640 channnels available for tracking:

o GPS: L1, L2 and L5 o GLONASS o GALILEO o BeiDou o SBAS o QZSS

• Must be able to log raw data internally or eternally

• Must have an internal UHF TX/Rx transmit radio that can operate between 410 and 420

Mhz

• Must have the antenna and receiver in one single contracted unit.

• Must be able to communicate through Bluetooth

• Must be able to withstand toppling from the top a 2 meter pole and falling to the ground

• Must have a water/dust resistance rating of IP67 or better.

• Must be CIO TA approved

Trimble brand Land Surveying GPS receivers, total stations, data collectors, and software are extensively used by the USFS survey teams at these locations for survey measurements and data processing. Not all surveying equipment is due for replacement, and the equipment still in use and to be retained is all Trimble branded. Integration of new receivers with the Trimble equipment being retained is required.

As specified, GPS receivers purchased must fully integrate with and utilize radio corrections sent from Trimble R12 & R980 GNSS receivers currently utilized by R6 Lands Boundary Surveying staff. Only Trimble R12, R12i & R980 receivers have this capability. The R12 does not have an IMU, the R12i does. Other Trimble receivers do not meet this and other specified requirements, and other no other GPS receivers with a technical approval do either. In discussion with Frontier Precision (July 2025), an authorized Trimble vendor, they only have 2 new R12i units available and are anticipating on selling them quicker than the USFS can move on a requisition. R12/R12i is no longer being produced. Recommendation: Acquire 3 Trimble R980 receivers as noted in the schedule of items.