Attachment_-_Technical_Specifications.pdf

TECHNICAL SPECIFICATIONS

I. GENERAL INFORMATION

The USGS VA-WV Water Science Center (VA-WV WSC) utilizes global navigation satellite systems (GNSS) receivers to establish datum (elevation) at USGS monitoring locations, as required by USGS WMA 2020.02 policy. GNSS receivers can also be used in other surveying applications to establish high-water mark elevations and compute indirect calculations of stream discharge. Data collected by GNSS receivers are processed using the Online Positioning User

Service (OPUS) hosted by the National Geodetic Survey to calculate land surface elevations, through real-time CORS networks (RTN), or using real-time kinematic surveying (RTK). This solicitation is for the procurement of GNSS receivers to be used by VA-WV WSC technicians to determine land surface elevations.

GNSS receivers are used broadly across the USGS Water Mission Area as a means of determining land surface elevation for a variety of purposes. The VA-WV WSC currently owns multiple

GNSS receivers but many of those receivers are past end of life and can no longer be used for data collection, requiring their replacement.

This procurement request is for GNSS equipment only and includes the acquisition of two (2) pairs of GNSS receivers and associated peripherals.

II. TECHNICAL SPECIFICATIONS

The equipment needed for each (of 2) GNSS system includes a base GNSS receiver, a rover

GNSS receiver, and field data collection and processing software for each (4 in total) of the receivers.

GNSS Receiver Specifications:

GNSS Technology

• Signal tracking compatibility with multiple satellite constellations, including GPS, GLONASS, Galileo, BeiDou, IRNSS, and QZSS

• Multi-constellation antenna, zero phase center, internal multipath suppressive board

• Positioning rate of 20Hz or better

• GPS tracking of L1 C/A, L1C, L2P, L2C and L5 frequencies

• GLONASS tracking of L1, L2, L3

• BEIDOU tracking of B1l, B2l, B3l, B1C, B2a, B2b

• GALILEO tracking of E1, E5a, E5b, E6

• QZSS tracking of L1, L2, L5

• IRNSS tracking of L5

Positioning

• Vertical positioning performance of 5mm + 0.4 ppm RMS or better

• Horizontal positioning performance of 2.5 mm or 0.5 ppm RMS or better

Communication

• Connectivity through a 4G modem or better

• Radio transceiver with 2 watts of power or better

• Type-C I/O connectors for charging and data transfer

• 2.1 + EDR, V5.0 Bluetooth capability or better

Power Supply

• Uninterrupted battery capacity to operate 10 hours or better

• Internal 3.6v power supply with 12 Ah capacity charged by USB-C

• Charge time of 4 hours or better

Data Storage

• Internal data logging capacity of 8 GB or better

Environmental

• Operating temperature of -40° to +65° C or better

• Ingress Protection of IP68 or better

• Drop resistance of 1.5 meters or better

General Features

• Integrated bottom stakeout camera with 2 MP camera or better

• Automatic compensation for pole tilt of 60 degrees or better

Support

• Actively supported equipment with periodic firmware updates available

Software

• Data collection and processing software shall be provided for each of the four GNSS receivers. The tablets used for data collection will be purchased separately. These tablets will be maintained locally to ensure software and firmware remain up to date and secure.

Accessories

• Tripod compatible with GNSS receivers (2 each)

• Pole bracket for tablet (4 each)

• Mounting pole for GNSS receivers (2 each)

• Field data collection software for operation of GNSS receivers (4 each)

Deliverables:

Two pairs of GNSS receivers (2 each base receiver and 2 each rover receiver). Accessories including tripod, adapters, and mounting poles as described above.

Delivery Address:

ATTN: TBA

U.S. Geological Survey

11 Dunbar Street

Charleston, WV 25301.