FARNBOROUGH, England A possible rover mission to Mars within the next eight years may rely on a larger parachutes, atomic clocks and inflatable decelerators, NASA's Mars exploration chief says.

With a large NASA rover only weeks away from arriving at the Red Planet, NASA's Doug McCuistion outlined ideas for another, far less expensive Martian mission in 2018 or 2020.

The inflatable decelerators, also known as ballutes, and big parachutes would help the spacecraft reduce its speed through the Martian atmosphere, while the atomic clocks would improve its landing accuracy, McCuistion announced Tuesday (July 10) at the Farnborough International Airshow here.

NASA expects to have up to $800 million to spend on the mission. That's a far cry from the $2.5 billion the agency is spending on its 1-ton Curiosity rover, which is due to land on the Red Planet Aug. 5.

"That price point [$800 million] is frankly around the point of a Discovery mission," McCuistion told SPACE.com. "Those missions tend to be characterized by simple systems, not too challenging." [ The Best (And Worst) Mars Landings in History ]

McCuisition added that he likely wont have the budget to fund the ballutes, parachutes and atomic clocks. Instead, NASAs Office of the Chief Technologist probably would pay for them.

For its Mars missions NASA is still using parachutes based on the design of the 1970s Viking landers. Those old-school chutes are 69 feet (21 meters) wide; the 2018 or 2020 mission would employ a 98-foot-wide (30 m) chute with a design that produces far more drag.

Working within the budget The lower price tag for a 2018 or 2020 mission reflects NASA's efforts to find a way forward in tough fiscal times. President Barack Obama's proposed 2013 federal budget, which was released in February, slashes NASA planetary science funding by 20 percent, with much of that coming out of the Mars program.

The cuts led NASA to withdraw from the European Space Agency-led ExoMars mission, which aims to send an orbiter and rover to the Red Planet in 2016 and 2018, respectively.

In response to its new budget situation, NASA asked scientists for ideas on how to explore Mars on the cheap. The most promising of these proposals were presented at a workshop at the Lunar and Planetary Institute in Houston in late June.

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NASA has big plans for future Mars rover