---
- description: "BlackJack is also referred to as TRSR-2 (Turbo Rogue Space Receiver-2). The instrument is of GPS/MET (Microlab) heritage (of a design as flown on CHAMP) and is being provided by NASA/JPL and built by Spectrum Astro Inc. of Gilbert, AZ. BlackJack is a 16-channel GPS receiver with the objective to provide supplementary positioning data to DORIS in support of the POD (Precision Orbit Determination) function and to enhance and/or improve gravity field models. Radial accuracies of 1-2 cm are obtained in post-processing. BlackJack is a fully redundant unit (two independent receivers operating in cold redundancy). Each unit is comprised of an omnidirectional antenna, low-noise amplifier, crystal oscillator, sampling down-converter, and a baseband digital processor assembly, communicating through a 1553 bus interface. Instrument mass = 10 kg (2), power = 17.5 W.\n"
  description_attribution: "https://directory.eoportal.org/web/eoportal/satellite-missions/j/jason-1\n"
  display_name: blackjack
  identifier: blackjack
  name: Turbo-Rogue Space Receiver
  type: instrument
  uri: /instrument/blackjack
- description: "JMR is a JPL instrument of TMR heritage. JMR is a passive microwave radiometer measuring the brightness temperatures in the nadir column at 18.7, 23.8, and 34 GHz, providing path delay correction for the altimeter (the brightness temperatures are converted to path-delay information). The 23.8 GHz channel is the primary water vapor sensor, the 34 GHz channel provides a correction for non-raining clouds, and the 18.7 GHz channel provides the correction for effects of wind-induced enhancements in the sea surface background emission.\n"
  description_attribution: "https://directory.eoportal.org/web/eoportal/satellite-missions/j/jason-1\n"
  display_name: jason-microwave-radiometer
  identifier: jason-microwave-radiometer
  name: JASON Microwave Radiometer
  type: instrument
  uri: /instrument/jason-microwave-radiometer
- description: "This passive sensor of JPL is used by a ground laser network (of 10-15 SLR stations) to track the position of the satellite for precision orbit determination (verification of altitude measurements). The mass of LRA is 29 kg; the LRA accuracy depends on laser station characteristics. The LRA is used to calibrate the other location systems on the satellite (DORIS, GPSDR) with a very high degree of precision.\n"
  description_attribution: "https://eoportal.org/web/eoportal/satellite-missions/t/topex-poseidon\n"
  display_name: laser-retroreflector-array
  identifier: laser-retroreflector-array
  name: Laser Retroreflector Array
  type: instrument
  uri: /instrument/laser-retroreflector-array
- description: "The TOPEX/Poseidon microwave radiometer was a three-frequency sensor used to estimate the atmospheric water vapor content in the nadir column through which the altimeter signal is traveling. Since water vapor distorts the altimeter's reading, the water vapor content is measured to correct the altimetry measurement. The sensor uses one frequency to make the measurement, and two frequencies to remove the effects of wind speed and cloud cover. There is a backup receiver for the measurement frequency.\n"
  description_attribution: https://sealevel.jpl.nasa.gov/technology/technologyinstrumentdescription/instrumentdescriptionradiometer/
  display_name: topex-microwave-radiometer
  identifier: topex-microwave-radiometer
  name: TOPEX Microwave Radiometer
  type: instrument
  uri: /instrument/topex-microwave-radiometer